initial commit, everything works

Gopkg.lock

@@ -0,0 +1,69 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  name = "github.com/Xe/ln"
+  packages = [".","ex"]
+  revision = "466e05b2ef3e48ce08a367b6aaac09ee29a124e5"
+  version = "v0.1"
+
+[[projects]]
+  name = "github.com/fogleman/gg"
+  packages = ["."]
+  revision = "6166aa3c1afaee416f384645a81636267aee6d25"
+  version = "v1.0.0"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/golang/freetype"
+  packages = ["raster","truetype"]
+  revision = "e2365dfdc4a05e4b8299a783240d4a7d5a65d4e4"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/golang/groupcache"
+  packages = [".","consistenthash","groupcachepb","lru","singleflight"]
+  revision = "84a468cf14b4376def5d68c722b139b881c450a4"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/golang/protobuf"
+  packages = ["proto"]
+  revision = "1e59b77b52bf8e4b449a57e6f79f21226d571845"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/jakobvarmose/go-qidenticon"
+  packages = ["."]
+  revision = "5c327fb4e74a797388267ff72353ab965e8c187d"
+
+[[projects]]
+  name = "github.com/pkg/errors"
+  packages = ["."]
+  revision = "645ef00459ed84a119197bfb8d8205042c6df63d"
+  version = "v0.8.0"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/image"
+  packages = ["font","font/basicfont","font/plan9font","math/fixed"]
+  revision = "12117c17ca67ffa1ce22e9409f3b0b0a93ac08c7"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/net"
+  packages = ["context","internal/timeseries","trace"]
+  revision = "d866cfc389cec985d6fda2859936a575a55a3ab6"
+
+[[projects]]
+  name = "gopkg.in/chi.v3"
+  packages = ["."]
+  revision = "e83ac2304db3c50cf03d96a2fcd39009d458bc35"
+  version = "v3.3.2"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "00d95a58026c595436556f0e477e217c30d776fbe877404204d1c8b51e956677"
+  solver-name = "gps-cdcl"
+  solver-version = 1

Gopkg.toml

@@ -0,0 +1,38 @@
+
+# Gopkg.toml example
+#
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#  name = "github.com/x/y"
+#  version = "2.4.0"
+
+
+[[constraint]]
+  name = "github.com/Xe/ln"
+  version = "0.1.0"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/golang/groupcache"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/jakobvarmose/go-qidenticon"
+
+[[constraint]]
+  name = "gopkg.in/chi.v3"
+  version = "3.3.2"

LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2017 Christine Dodrill <me@christine.website>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

cmd/identicond/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"bytes"
+	"image/png"
+	"net/http"
+	"os"
+
+	"github.com/Xe/ln"
+	"github.com/Xe/ln/ex"
+	"github.com/golang/groupcache"
+	qidenticon "github.com/jakobvarmose/go-qidenticon"
+	chi "gopkg.in/chi.v3"
+)
+
+const (
+	avatarWidth = 512
+	fiftyMegs   = 1024 * 1024 * 50
+)
+
+func makeQidenticon(ctx groupcache.Context, key string, dest groupcache.Sink) error {
+	img := qidenticon.Render(qidenticon.Code(key), avatarWidth, qidenticon.DefaultSettings())
+	buf := bytes.NewBuffer(nil)
+
+	err := png.Encode(buf, img)
+	if err != nil {
+		return err
+	}
+
+	dest.SetBytes(buf.Bytes())
+	return nil
+}
+
+func main() {
+	g := groupcache.NewGroup("identicons", fiftyMegs, groupcache.GetterFunc(makeQidenticon))
+
+	r := chi.NewRouter()
+	r.Use(ex.HTTPLog)
+	r.Get("/{hash}", func(w http.ResponseWriter, r *http.Request) {
+		var bs []byte
+		sink := groupcache.AllocatingByteSliceSink(&bs)
+		hash := chi.URLParam(r, "hash")
+
+		err := g.Get(r.Context(), hash, sink)
+		if err != nil {
+			ln.Error(r.Context(), err, ln.Action("can't get hash"), ln.F{"hash": hash})
+			http.Error(w, "internal server error, please contact the admin", http.StatusInternalServerError)
+			return
+		}
+
+		w.Header().Add("Content-Type", "image/png")
+		w.Write(bs)
+	})
+	http.ListenAndServe(":"+os.Getenv("PORT"), r)
+}

vendor/github.com/Xe/ln/LICENSE

@@ -0,0 +1,25 @@
+Copyright (c) 2015, Andrew Gwozdziewycz
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/Xe/ln/README.md

@@ -0,0 +1,29 @@
+# ln: The Natural Logger for Go
+
+`ln` provides a simple interface to logging, and metrics, and
+obviates the need to utilize purpose built metrics packages, like
+`go-metrics` for simple use cases.
+
+The design of `ln` centers around the idea of key-value pairs, which
+can be interpreted on the fly, but "Filters" to do things such as
+aggregated metrics, and report said metrics to, say Librato, or
+statsd.
+
+"Filters" are like WSGI, or Rack Middleware. They are run "top down"
+and can abort an emitted log's output at any time, or continue to let
+it through the chain. However, the interface is slightly different
+than that. Rather than encapsulating the chain with partial function
+application, we utilize a simpler method, namely, each plugin defines
+an `Apply` function, which takes as an argument the log event, and
+performs the work of the plugin, only if the Plugin "Applies" to this
+log event.
+
+If `Apply` returns `false`, the iteration through the rest of the
+filters is aborted, and the log is dropped from further processing.
+
+## Current Status: Initial Development / Concept
+
+## Copyright
+
+(c) 2015, Andrew Gwozdziewycz, BSD Licensed. See LICENSE for more
+info.

vendor/github.com/Xe/ln/action.go

@@ -0,0 +1,11 @@
+package ln
+
+// Action is a convenience helper for logging the "action" being performed as
+// part of a log line.
+//
+// It is a convenience wrapper for the following:
+//
+//     ln.Log(ctx, fer, f, ln.Action("writing frozberry sales reports to database"))
+func Action(act string) Fer {
+	return F{"action": act}
+}

vendor/github.com/Xe/ln/context.go

@@ -0,0 +1,38 @@
+package ln
+
+import (
+	"context"
+)
+
+type ctxKey int
+
+const (
+	fKey = iota
+)
+
+// WithF stores or appends a given F instance into a context.
+func WithF(ctx context.Context, f F) context.Context {
+	pf, ok := FFromContext(ctx)
+	if !ok {
+		return context.WithValue(ctx, fKey, f)
+	}
+
+	pf.Extend(f)
+
+	return context.WithValue(ctx, fKey, pf)
+}
+
+// FFromContext fetches the `F` out of the context if it exists.
+func FFromContext(ctx context.Context) (F, bool) {
+	fvp := ctx.Value(fKey)
+	if fvp == nil {
+		return nil, false
+	}
+
+	f, ok := fvp.(F)
+	if !ok {
+		return nil, false
+	}
+
+	return f, true
+}

vendor/github.com/Xe/ln/doc.go

@@ -0,0 +1,25 @@
+/*
+Package ln is the Natural Logger for Go
+
+`ln` provides a simple interface to logging, and metrics, and
+obviates the need to utilize purpose built metrics packages, like
+`go-metrics` for simple use cases.
+
+The design of `ln` centers around the idea of key-value pairs, which
+can be interpreted on the fly, but "Filters" to do things such as
+aggregated metrics, and report said metrics to, say Librato, or
+statsd.
+
+"Filters" are like WSGI, or Rack Middleware. They are run "top down"
+and can abort an emitted log's output at any time, or continue to let
+it through the chain. However, the interface is slightly different
+than that. Rather than encapsulating the chain with partial function
+application, we utilize a simpler method, namely, each plugin defines
+an `Apply` function, which takes as an argument the log event, and
+performs the work of the plugin, only if the Plugin "Applies" to this
+log event.
+
+If `Apply` returns `false`, the iteration through the rest of the
+filters is aborted, and the log is dropped from further processing.
+*/
+package ln

vendor/github.com/Xe/ln/ex/doc.go

@@ -0,0 +1,7 @@
+/*
+Package ex is a set of extensions and middleware for ln.
+
+This package will (inevitably) have a lot of third-party dependencies and
+as such might be broken apart into other packages in the future.
+*/
+package ex

vendor/github.com/Xe/ln/ex/gotrace.go

@@ -0,0 +1,68 @@
+package ex
+
+import (
+	"context"
+	"log"
+
+	"github.com/Xe/ln"
+	"golang.org/x/net/trace"
+)
+
+type goEventLogger struct {
+	ev trace.EventLog
+}
+
+// NewGoEventLogger will log ln information to a given trace.EventLog instance.
+func NewGoEventLogger(ev trace.EventLog) ln.Filter {
+	return &goEventLogger{ev: ev}
+}
+
+func (gel *goEventLogger) Apply(ctx context.Context, e ln.Event) bool {
+	data, err := ln.DefaultFormatter.Format(ctx, e)
+	if err != nil {
+		log.Printf("wtf: error in log formatting: %v", err)
+		return false
+	}
+
+	if everr := e.Data["err"]; everr != nil {
+		gel.ev.Errorf("%s", string(data))
+		return true
+	}
+
+	gel.ev.Printf("%s", string(data))
+	return true
+}
+
+func (gel *goEventLogger) Close() { gel.ev.Finish() }
+func (gel *goEventLogger) Run()   {}
+
+type sst string
+
+func (s sst) String() string { return string(s) }
+
+func goTraceLogger(ctx context.Context, e ln.Event) bool {
+	sp, ok := trace.FromContext(ctx)
+	if !ok {
+		return true // no trace in context
+	}
+
+	data, err := ln.DefaultFormatter.Format(ctx, e)
+	if err != nil {
+		log.Printf("wtf: error in log formatting: %v", err)
+		return false
+	}
+
+	if everr := e.Data["err"]; everr != nil {
+		sp.SetError()
+	}
+
+	sp.LazyLog(sst(string(data)), false)
+
+	return true
+}
+
+// NewGoTraceLogger will log ln information to a golang.org/x/net/trace.Trace
+// if it is present in the context of ln calls.
+func NewGoTraceLogger() ln.Filter {
+	return ln.FilterFunc(goTraceLogger)
+}

vendor/github.com/Xe/ln/ex/http.go

@@ -0,0 +1,36 @@
+package ex
+
+import (
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/Xe/ln"
+)
+
+func HTTPLog(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		host, _, _ := net.SplitHostPort(r.RemoteAddr)
+		f := ln.F{
+			"remote_ip":       host,
+			"x_forwarded_for": r.Header.Get("X-Forwarded-For"),
+			"path":            r.URL.Path,
+		}
+		ctx := ln.WithF(r.Context(), f)
+		st := time.Now()
+
+		next.ServeHTTP(w, r.WithContext(ctx))
+
+		af := time.Now()
+		f["request_duration"] = af.Sub(st)
+
+		ws, ok := w.(interface {
+			Status() int
+		})
+		if ok {
+			f["status"] = ws.Status()
+		}
+
+		ln.Log(r.Context(), f)
+	})
+}

vendor/github.com/Xe/ln/ex/l2met.go

@@ -0,0 +1,25 @@
+package ex
+
+import (
+	"time"
+
+	"github.com/Xe/ln"
+)
+
+// This file deals with formatting of [l2met] style metrics.
+// [l2met]: https://r.32k.io/l2met-introduction
+
+// Counter formats a value as a metrics counter.
+func Counter(name string, value int) ln.Fer {
+	return ln.F{"count#" + name: value}
+}
+
+// Gauge formats a value as a metrics gauge.
+func Gauge(name string, value int) ln.Fer {
+	return ln.F{"gauge#" + name: value}
+}
+
+// Measure formats a value as a metrics measure.
+func Measure(name string, ts time.Time) ln.Fer {
+	return ln.F{"measure#" + name: time.Since(ts)}
+}

vendor/github.com/Xe/ln/example/http.go

@@ -0,0 +1,51 @@
+// +build ignore
+
+package main
+
+import (
+	"context"
+	"flag"
+	"net/http"
+	"time"
+
+	"github.com/Xe/ln"
+	"github.com/Xe/ln/ex"
+	"github.com/facebookgo/flagenv"
+	"golang.org/x/net/trace"
+)
+
+var (
+	port          = flag.String("port", "2145", "http port to listen on")
+	tracingFamily = flag.String("trace-family", "ln example", "tracing family to use for x/net/trace")
+)
+
+func main() {
+	flagenv.Parse()
+	flag.Parse()
+
+	ln.DefaultLogger.Filters = append(ln.DefaultLogger.Filters, ex.NewGoTraceLogger())
+
+	http.HandleFunc("/", handleIndex)
+	http.ListenAndServe(":"+*port, middlewareSpan(ex.HTTPLog(http.DefaultServeMux)))
+}
+
+func middlewareSpan(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		sp := trace.New(*tracingFamily, "HTTP request")
+		defer sp.Finish()
+		ctx, cancel := context.WithTimeout(r.Context(), 30*time.Second)
+		defer cancel()
+
+		ctx = trace.NewContext(ctx, sp)
+
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func handleIndex(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	ln.Log(ctx, ln.Action("index"), ln.F{"there_is": "no_danger"})
+
+	http.Error(w, "There is no danger citizen", http.StatusOK)
+}

vendor/github.com/Xe/ln/filter.go

@@ -0,0 +1,67 @@
+package ln
+
+import (
+	"context"
+	"io"
+	"sync"
+)
+
+// Filter interface for defining chain filters
+type Filter interface {
+	Apply(ctx context.Context, e Event) bool
+	Run()
+	Close()
+}
+
+// FilterFunc allows simple functions to implement the Filter interface
+type FilterFunc func(ctx context.Context, e Event) bool
+
+// Apply implements the Filter interface
+func (ff FilterFunc) Apply(ctx context.Context, e Event) bool {
+	return ff(ctx, e)
+}
+
+// Run implements the Filter interface
+func (ff FilterFunc) Run() {}
+
+// Close implements the Filter interface
+func (ff FilterFunc) Close() {}
+
+// WriterFilter implements a filter, which arbitrarily writes to an io.Writer
+type WriterFilter struct {
+	sync.Mutex
+	Out       io.Writer
+	Formatter Formatter
+}
+
+// NewWriterFilter creates a filter to add to the chain
+func NewWriterFilter(out io.Writer, format Formatter) *WriterFilter {
+	if format == nil {
+		format = DefaultFormatter
+	}
+	return &WriterFilter{
+		Out:       out,
+		Formatter: format,
+	}
+}
+
+// Apply implements the Filter interface
+func (w *WriterFilter) Apply(ctx context.Context, e Event) bool {
+	output, err := w.Formatter.Format(ctx, e)
+	if err == nil {
+		w.Lock()
+		w.Out.Write(output)
+		w.Unlock()
+	}
+
+	return true
+}
+
+// Run implements the Filter interface
+func (w *WriterFilter) Run() {}
+
+// Close implements the Filter interface
+func (w *WriterFilter) Close() {}
+
+// NilFilter is safe to return as a Filter, but does nothing
+var NilFilter = FilterFunc(func(_ context.Context, e Event) bool { return true })

vendor/github.com/Xe/ln/formatter.go

@@ -0,0 +1,111 @@
+package ln
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"time"
+)
+
+var (
+	// DefaultTimeFormat represents the way in which time will be formatted by default
+	DefaultTimeFormat = time.RFC3339
+)
+
+// Formatter defines the formatting of events
+type Formatter interface {
+	Format(ctx context.Context, e Event) ([]byte, error)
+}
+
+// DefaultFormatter is the default way in which to format events
+var DefaultFormatter Formatter
+
+func init() {
+	DefaultFormatter = NewTextFormatter()
+}
+
+// TextFormatter formats events as key value pairs.
+// Any remaining text not wrapped in an instance of `F` will be
+// placed at the end.
+type TextFormatter struct {
+	TimeFormat string
+}
+
+// NewTextFormatter returns a Formatter that outputs as text.
+func NewTextFormatter() Formatter {
+	return &TextFormatter{TimeFormat: DefaultTimeFormat}
+}
+
+// Format implements the Formatter interface
+func (t *TextFormatter) Format(_ context.Context, e Event) ([]byte, error) {
+	var writer bytes.Buffer
+
+	writer.WriteString("time=\"")
+	writer.WriteString(e.Time.Format(t.TimeFormat))
+	writer.WriteString("\"")
+
+	keys := make([]string, len(e.Data))
+	i := 0
+
+	for k := range e.Data {
+		keys[i] = k
+		i++
+	}
+
+	for _, k := range keys {
+		v := e.Data[k]
+
+		writer.WriteByte(' ')
+		if shouldQuote(k) {
+			writer.WriteString(fmt.Sprintf("%q", k))
+		} else {
+			writer.WriteString(k)
+		}
+
+		writer.WriteByte('=')
+
+		switch v.(type) {
+		case string:
+			vs, _ := v.(string)
+			if shouldQuote(vs) {
+				fmt.Fprintf(&writer, "%q", vs)
+			} else {
+				writer.WriteString(vs)
+			}
+		case error:
+			tmperr, _ := v.(error)
+			es := tmperr.Error()
+
+			if shouldQuote(es) {
+				fmt.Fprintf(&writer, "%q", es)
+			} else {
+				writer.WriteString(es)
+			}
+		case time.Time:
+			tmptime, _ := v.(time.Time)
+			writer.WriteString(tmptime.Format(time.RFC3339))
+		default:
+			fmt.Fprint(&writer, v)
+		}
+	}
+
+	if len(e.Message) > 0 {
+		fmt.Fprintf(&writer, " _msg=%q", e.Message)
+	}
+
+	writer.WriteByte('\n')
+	return writer.Bytes(), nil
+}
+
+func shouldQuote(s string) bool {
+	for _, b := range s {
+		if !((b >= 'A' && b <= 'Z') ||
+			(b >= 'a' && b <= 'z') ||
+			(b >= '0' && b <= '9') ||
+			(b == '-' || b == '.' || b == '#' ||
+				b == '/' || b == '_')) {
+			return true
+		}
+	}
+	return false
+}

vendor/github.com/Xe/ln/logger.go

@@ -0,0 +1,180 @@
+package ln
+
+import (
+	"context"
+	"os"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+// Logger holds the current priority and list of filters
+type Logger struct {
+	Filters []Filter
+}
+
+// DefaultLogger is the default implementation of Logger
+var DefaultLogger *Logger
+
+func init() {
+	var defaultFilters []Filter
+
+	// Default to STDOUT for logging, but allow LN_OUT to change it.
+	out := os.Stdout
+	if os.Getenv("LN_OUT") == "<stderr>" {
+		out = os.Stderr
+	}
+
+	defaultFilters = append(defaultFilters, NewWriterFilter(out, nil))
+
+	DefaultLogger = &Logger{
+		Filters: defaultFilters,
+	}
+}
+
+// F is a key-value mapping for structured data.
+type F map[string]interface{}
+
+// Extend concatentates one F with one or many Fer instances.
+func (f F) Extend(other ...Fer) {
+	for _, ff := range other {
+		for k, v := range ff.F() {
+			f[k] = v
+		}
+	}
+}
+
+// F makes F an Fer
+func (f F) F() F {
+	return f
+}
+
+// Fer allows any type to add fields to the structured logging key->value pairs.
+type Fer interface {
+	F() F
+}
+
+// Event represents an event
+type Event struct {
+	Time    time.Time
+	Data    F
+	Message string
+}
+
+// Log is the generic logging method.
+func (l *Logger) Log(ctx context.Context, xs ...Fer) {
+	event := Event{Time: time.Now()}
+
+	addF := func(bf F) {
+		if event.Data == nil {
+			event.Data = bf
+		} else {
+			for k, v := range bf {
+				event.Data[k] = v
+			}
+		}
+	}
+
+	for _, f := range xs {
+		addF(f.F())
+	}
+
+	ctxf, ok := FFromContext(ctx)
+	if ok {
+		addF(ctxf)
+	}
+
+	if os.Getenv("LN_DEBUG_ALL_EVENTS") == "1" {
+		frame := callersFrame()
+		if event.Data == nil {
+			event.Data = make(F)
+		}
+		event.Data["_lineno"] = frame.lineno
+		event.Data["_function"] = frame.function
+		event.Data["_filename"] = frame.filename
+	}
+
+	l.filter(ctx, event)
+}
+
+func (l *Logger) filter(ctx context.Context, e Event) {
+	for _, f := range l.Filters {
+		if !f.Apply(ctx, e) {
+			return
+		}
+	}
+}
+
+// Error logs an error and information about the context of said error.
+func (l *Logger) Error(ctx context.Context, err error, xs ...Fer) {
+	data := F{}
+	frame := callersFrame()
+
+	data["_lineno"] = frame.lineno
+	data["_function"] = frame.function
+	data["_filename"] = frame.filename
+	data["err"] = err
+
+	cause := errors.Cause(err)
+	if cause != nil {
+		data["cause"] = cause.Error()
+	}
+
+	xs = append(xs, data)
+
+	l.Log(ctx, xs...)
+}
+
+// Fatal logs this set of values, then exits with status code 1.
+func (l *Logger) Fatal(ctx context.Context, xs ...Fer) {
+	xs = append(xs, F{"fatal": true})
+
+	l.Log(ctx, xs...)
+
+	os.Exit(1)
+}
+
+// FatalErr combines Fatal and Error.
+func (l *Logger) FatalErr(ctx context.Context, err error, xs ...Fer) {
+	xs = append(xs, F{"fatal": true})
+
+	data := F{}
+	frame := callersFrame()
+
+	data["_lineno"] = frame.lineno
+	data["_function"] = frame.function
+	data["_filename"] = frame.filename
+	data["err"] = err
+
+	cause := errors.Cause(err)
+	if cause != nil {
+		data["cause"] = cause.Error()
+	}
+
+	xs = append(xs, data)
+	l.Log(ctx, xs...)
+
+	os.Exit(1)
+}
+
+// Default Implementation
+
+// Log is the generic logging method.
+func Log(ctx context.Context, xs ...Fer) {
+	DefaultLogger.Log(ctx, xs...)
+}
+
+// Error logs an error and information about the context of said error.
+func Error(ctx context.Context, err error, xs ...Fer) {
+	DefaultLogger.Error(ctx, err, xs...)
+}
+
+// Fatal logs this set of values, then exits with status code 1.
+func Fatal(ctx context.Context, xs ...Fer) {
+	DefaultLogger.Fatal(ctx, xs...)
+}
+
+// FatalErr combines Fatal and Error.
+func FatalErr(ctx context.Context, err error, xs ...Fer) {
+	DefaultLogger.FatalErr(ctx, err, xs...)
+}

vendor/github.com/Xe/ln/logger_test.go

@@ -0,0 +1,111 @@
+package ln
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"testing"
+	"time"
+)
+
+var ctx context.Context
+
+func setup(t *testing.T) (*bytes.Buffer, func()) {
+	ctx = context.Background()
+
+	out := bytes.Buffer{}
+	oldFilters := DefaultLogger.Filters
+	DefaultLogger.Filters = []Filter{NewWriterFilter(&out, nil)}
+	return &out, func() {
+		DefaultLogger.Filters = oldFilters
+	}
+}
+
+func TestSimpleError(t *testing.T) {
+	out, teardown := setup(t)
+	defer teardown()
+
+	Log(ctx, F{"err": fmt.Errorf("This is an Error!!!")}, F{"msg": "fooey", "bar": "foo"})
+	data := []string{
+		`err="This is an Error!!!"`,
+		`fooey`,
+		`bar=foo`,
+	}
+
+	for _, line := range data {
+		if !bytes.Contains(out.Bytes(), []byte(line)) {
+			t.Fatalf("Bytes: %s not in %s", line, out.Bytes())
+		}
+	}
+}
+
+func TestTimeConversion(t *testing.T) {
+	out, teardown := setup(t)
+	defer teardown()
+
+	var zeroTime time.Time
+
+	Log(ctx, F{"zero": zeroTime})
+	data := []string{
+		`zero=0001-01-01T00:00:00Z`,
+	}
+
+	for _, line := range data {
+		if !bytes.Contains(out.Bytes(), []byte(line)) {
+			t.Fatalf("Bytes: %s not in %s", line, out.Bytes())
+		}
+	}
+}
+
+func TestDebug(t *testing.T) {
+	out, teardown := setup(t)
+	defer teardown()
+
+	// set priority to Debug
+	Error(ctx, fmt.Errorf("This is an Error!!!"), F{})
+
+	data := []string{
+		`err="This is an Error!!!"`,
+		`_lineno=`,
+		`_function=ln.TestDebug`,
+		`_filename=github.com/Xe/ln/logger_test.go`,
+		`cause="This is an Error!!!"`,
+	}
+
+	for _, line := range data {
+		if !bytes.Contains(out.Bytes(), []byte(line)) {
+			t.Fatalf("Bytes: %s not in %s", line, out.Bytes())
+		}
+	}
+}
+
+func TestFer(t *testing.T) {
+	out, teardown := setup(t)
+	defer teardown()
+
+	underTest := foobar{Foo: 1, Bar: "quux"}
+
+	Log(ctx, underTest)
+	data := []string{
+		`foo=1`,
+		`bar=quux`,
+	}
+
+	for _, line := range data {
+		if !bytes.Contains(out.Bytes(), []byte(line)) {
+			t.Fatalf("Bytes: %s not in %s", line, out.Bytes())
+		}
+	}
+}
+
+type foobar struct {
+	Foo int
+	Bar string
+}
+
+func (f foobar) F() F {
+	return F{
+		"foo": f.Foo,
+		"bar": f.Bar,
+	}
+}

vendor/github.com/Xe/ln/stack.go

@@ -0,0 +1,44 @@
+package ln
+
+import (
+	"os"
+	"runtime"
+	"strings"
+)
+
+type frame struct {
+	filename string
+	function string
+	lineno   int
+}
+
+// skips 2 frames, since Caller returns the current frame, and we need
+// the caller's caller.
+func callersFrame() frame {
+	var out frame
+	pc, file, line, ok := runtime.Caller(3)
+	if !ok {
+		return out
+	}
+	srcLoc := strings.LastIndex(file, "/src/")
+	if srcLoc >= 0 {
+		file = file[srcLoc+5:]
+	}
+	out.filename = file
+	out.function = functionName(pc)
+	out.lineno = line
+
+	return out
+}
+
+func functionName(pc uintptr) string {
+	fn := runtime.FuncForPC(pc)
+	if fn == nil {
+		return "???"
+	}
+	name := fn.Name()
+	beg := strings.LastIndex(name, string(os.PathSeparator))
+	return name[beg+1:]
+	//	end := strings.LastIndex(name, string(os.PathSeparator))
+	//	return name[end+1 : len(name)]
+}

vendor/github.com/fogleman/gg/.gitignore

@@ -0,0 +1,2 @@
+*.png
+

vendor/github.com/fogleman/gg/LICENSE.md

@@ -0,0 +1,19 @@
+Copyright (C) 2016 Michael Fogleman
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/fogleman/gg/README.md

@@ -0,0 +1,220 @@
+# Go Graphics
+
+`gg` is a library for rendering 2D graphics in pure Go.
+
+![Stars](http://i.imgur.com/CylQIJt.png)
+
+## Installation
+
+    go get github.com/fogleman/gg
+
+## GoDoc
+
+https://godoc.org/github.com/fogleman/gg
+
+## Hello, Circle!
+
+Look how easy!
+
+```go
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+    dc := gg.NewContext(1000, 1000)
+    dc.DrawCircle(500, 500, 400)
+    dc.SetRGB(0, 0, 0)
+    dc.Fill()
+    dc.SavePNG("out.png")
+}
+```
+
+## Examples
+
+There are [lots of examples](https://github.com/fogleman/gg/tree/master/examples) included. They're mostly for testing the code, but they're good for learning, too.
+
+![Examples](http://i.imgur.com/tMFoyzu.png)
+
+## Creating Contexts
+
+There are a few ways of creating a context.
+
+```go
+NewContext(width, height int) *Context
+NewContextForImage(im image.Image) *Context
+NewContextForRGBA(im *image.RGBA) *Context
+```
+
+## Drawing Functions
+
+Ever used a graphics library that didn't have functions for drawing rectangles
+or circles? What a pain!
+
+```go
+DrawPoint(x, y, r float64)
+DrawLine(x1, y1, x2, y2 float64)
+DrawRectangle(x, y, w, h float64)
+DrawRoundedRectangle(x, y, w, h, r float64)
+DrawCircle(x, y, r float64)
+DrawArc(x, y, r, angle1, angle2 float64)
+DrawEllipse(x, y, rx, ry float64)
+DrawEllipticalArc(x, y, rx, ry, angle1, angle2 float64)
+DrawRegularPolygon(n int, x, y, r, rotation float64)
+DrawImage(im image.Image, x, y int)
+DrawImageAnchored(im image.Image, x, y int, ax, ay float64)
+SetPixel(x, y int)
+
+MoveTo(x, y float64)
+LineTo(x, y float64)
+QuadraticTo(x1, y1, x2, y2 float64)
+CubicTo(x1, y1, x2, y2, x3, y3 float64)
+ClosePath()
+ClearPath()
+NewSubPath()
+
+Clear()
+Stroke()
+Fill()
+StrokePreserve()
+FillPreserve()
+```
+
+It is often desired to center an image at a point. Use `DrawImageAnchored` with `ax` and `ay` set to 0.5 to do this. Use 0 to left or top align. Use 1 to right or bottom align. `DrawStringAnchored` does the same for text, so you don't need to call `MeasureString` yourself.
+
+## Text Functions
+
+It will even do word wrap for you!
+
+```go
+DrawString(s string, x, y float64)
+DrawStringAnchored(s string, x, y, ax, ay float64)
+DrawStringWrapped(s string, x, y, ax, ay, width, lineSpacing float64, align Align)
+MeasureString(s string) (w, h float64)
+WordWrap(s string, w float64) []string
+SetFontFace(fontFace font.Face)
+LoadFontFace(path string, points float64) error
+```
+
+## Color Functions
+
+Colors can be set in several different ways for your convenience.
+
+```go
+SetRGB(r, g, b float64)
+SetRGBA(r, g, b, a float64)
+SetRGB255(r, g, b int)
+SetRGBA255(r, g, b, a int)
+SetColor(c color.Color)
+SetHexColor(x string)
+```
+
+## Stroke & Fill Options
+
+```go
+SetLineWidth(lineWidth float64)
+SetLineCap(lineCap LineCap)
+SetLineJoin(lineJoin LineJoin)
+SetDash(dashes ...float64)
+SetFillRule(fillRule FillRule)
+```
+
+## Gradients & Patterns
+
+`gg` supports linear and radial gradients and surface patterns. You can also implement your own patterns.
+
+```go
+SetFillStyle(pattern Pattern)
+SetStrokeStyle(pattern Pattern)
+NewSolidPattern(color color.Color)
+NewLinearGradient(x0, y0, x1, y1 float64)
+NewRadialGradient(x0, y0, r0, x1, y1, r1 float64)
+NewSurfacePattern(im image.Image, op RepeatOp)
+```
+
+## Transformation Functions
+
+```go
+Identity()
+Translate(x, y float64)
+Scale(x, y float64)
+Rotate(angle float64)
+Shear(x, y float64)
+ScaleAbout(sx, sy, x, y float64)
+RotateAbout(angle, x, y float64)
+ShearAbout(sx, sy, x, y float64)
+TransformPoint(x, y float64) (tx, ty float64)
+InvertY()
+```
+
+It is often desired to rotate or scale about a point that is not the origin. The functions `RotateAbout`, `ScaleAbout`, `ShearAbout` are provided as a convenience.
+
+`InvertY` is provided in case Y should increase from bottom to top vs. the default top to bottom.
+
+Note: transforms do not currently affect `DrawImage` or `DrawString`.
+
+## Stack Functions
+
+Save and restore the state of the context. These can be nested.
+
+```go
+Push()
+Pop()
+```
+
+## Clipping Functions
+
+Use clipping regions to restrict drawing operations to an area that you
+defined using paths.
+
+```go
+Clip()
+ClipPreserve()
+ResetClip()
+```
+
+## Helper Functions
+
+Sometimes you just don't want to write these yourself.
+
+```go
+Radians(degrees float64) float64
+Degrees(radians float64) float64
+LoadImage(path string) (image.Image, error)
+LoadPNG(path string) (image.Image, error)
+SavePNG(path string, im image.Image) error
+```
+
+![Separator](http://i.imgur.com/fsUvnPB.png)
+
+## How Do it Do?
+
+`gg` is mostly a wrapper around `github.com/golang/freetype/raster`. The goal
+is to provide some more functionality and a nicer API that will suffice for
+most use cases.
+
+## Another Example
+
+See the output of this example below.
+
+```go
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const S = 1024
+	dc := gg.NewContext(S, S)
+	dc.SetRGBA(0, 0, 0, 0.1)
+	for i := 0; i < 360; i += 15 {
+		dc.Push()
+		dc.RotateAbout(gg.Radians(float64(i)), S/2, S/2)
+		dc.DrawEllipse(S/2, S/2, S*7/16, S/8)
+		dc.Fill()
+		dc.Pop()
+	}
+	dc.SavePNG("out.png")
+}
+```
+
+![Ellipses](http://i.imgur.com/J9CBZef.png)

vendor/github.com/fogleman/gg/bezier.go

@@ -0,0 +1,59 @@
+package gg
+
+import "math"
+
+func quadratic(x0, y0, x1, y1, x2, y2, t float64) (x, y float64) {
+	u := 1 - t
+	a := u * u
+	b := 2 * u * t
+	c := t * t
+	x = a*x0 + b*x1 + c*x2
+	y = a*y0 + b*y1 + c*y2
+	return
+}
+
+func QuadraticBezier(x0, y0, x1, y1, x2, y2 float64) []Point {
+	l := (math.Hypot(x1-x0, y1-y0) +
+		math.Hypot(x2-x1, y2-y1))
+	n := int(l + 0.5)
+	if n < 4 {
+		n = 4
+	}
+	d := float64(n) - 1
+	result := make([]Point, n)
+	for i := 0; i < n; i++ {
+		t := float64(i) / d
+		x, y := quadratic(x0, y0, x1, y1, x2, y2, t)
+		result[i] = Point{x, y}
+	}
+	return result
+}
+
+func cubic(x0, y0, x1, y1, x2, y2, x3, y3, t float64) (x, y float64) {
+	u := 1 - t
+	a := u * u * u
+	b := 3 * u * u * t
+	c := 3 * u * t * t
+	d := t * t * t
+	x = a*x0 + b*x1 + c*x2 + d*x3
+	y = a*y0 + b*y1 + c*y2 + d*y3
+	return
+}
+
+func CubicBezier(x0, y0, x1, y1, x2, y2, x3, y3 float64) []Point {
+	l := (math.Hypot(x1-x0, y1-y0) +
+		math.Hypot(x2-x1, y2-y1) +
+		math.Hypot(x3-x2, y3-y2))
+	n := int(l + 0.5)
+	if n < 4 {
+		n = 4
+	}
+	d := float64(n) - 1
+	result := make([]Point, n)
+	for i := 0; i < n; i++ {
+		t := float64(i) / d
+		x, y := cubic(x0, y0, x1, y1, x2, y2, x3, y3, t)
+		result[i] = Point{x, y}
+	}
+	return result
+}

vendor/github.com/fogleman/gg/context.go

@@ -0,0 +1,768 @@
+// Package gg provides a simple API for rendering 2D graphics in pure Go.
+package gg
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"io"
+	"math"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/basicfont"
+)
+
+type LineCap int
+
+const (
+	LineCapRound LineCap = iota
+	LineCapButt
+	LineCapSquare
+)
+
+type LineJoin int
+
+const (
+	LineJoinRound LineJoin = iota
+	LineJoinBevel
+)
+
+type FillRule int
+
+const (
+	FillRuleWinding FillRule = iota
+	FillRuleEvenOdd
+)
+
+type Align int
+
+const (
+	AlignLeft Align = iota
+	AlignCenter
+	AlignRight
+)
+
+var (
+	defaultFillStyle   = NewSolidPattern(color.White)
+	defaultStrokeStyle = NewSolidPattern(color.Black)
+)
+
+type Context struct {
+	width         int
+	height        int
+	im            *image.RGBA
+	mask          *image.Alpha
+	color         color.Color
+	fillPattern   Pattern
+	strokePattern Pattern
+	strokePath    raster.Path
+	fillPath      raster.Path
+	start         Point
+	current       Point
+	hasCurrent    bool
+	dashes        []float64
+	lineWidth     float64
+	lineCap       LineCap
+	lineJoin      LineJoin
+	fillRule      FillRule
+	fontFace      font.Face
+	fontHeight    float64
+	matrix        Matrix
+	stack         []*Context
+}
+
+// NewContext creates a new image.RGBA with the specified width and height
+// and prepares a context for rendering onto that image.
+func NewContext(width, height int) *Context {
+	return NewContextForRGBA(image.NewRGBA(image.Rect(0, 0, width, height)))
+}
+
+// NewContextForImage copies the specified image into a new image.RGBA
+// and prepares a context for rendering onto that image.
+func NewContextForImage(im image.Image) *Context {
+	return NewContextForRGBA(imageToRGBA(im))
+}
+
+// NewContextForRGBA prepares a context for rendering onto the specified image.
+// No copy is made.
+func NewContextForRGBA(im *image.RGBA) *Context {
+	return &Context{
+		width:         im.Bounds().Size().X,
+		height:        im.Bounds().Size().Y,
+		im:            im,
+		color:         color.Transparent,
+		fillPattern:   defaultFillStyle,
+		strokePattern: defaultStrokeStyle,
+		lineWidth:     1,
+		fillRule:      FillRuleWinding,
+		fontFace:      basicfont.Face7x13,
+		fontHeight:    13,
+		matrix:        Identity(),
+	}
+}
+
+// Image returns the image that has been drawn by this context.
+func (dc *Context) Image() image.Image {
+	return dc.im
+}
+
+// Width returns the width of the image in pixels.
+func (dc *Context) Width() int {
+	return dc.width
+}
+
+// Height returns the height of the image in pixels.
+func (dc *Context) Height() int {
+	return dc.height
+}
+
+// SavePNG encodes the image as a PNG and writes it to disk.
+func (dc *Context) SavePNG(path string) error {
+	return SavePNG(path, dc.im)
+}
+
+// EncodePNG encodes the image as a PNG and writes it to the provided io.Writer.
+func (dc *Context) EncodePNG(w io.Writer) error {
+	return png.Encode(w, dc.im)
+}
+
+// SetDash sets the current dash pattern to use. Call with zero arguments to
+// disable dashes. The values specify the lengths of each dash, with
+// alternating on and off lengths.
+func (dc *Context) SetDash(dashes ...float64) {
+	dc.dashes = dashes
+}
+
+func (dc *Context) SetLineWidth(lineWidth float64) {
+	dc.lineWidth = lineWidth
+}
+
+func (dc *Context) SetLineCap(lineCap LineCap) {
+	dc.lineCap = lineCap
+}
+
+func (dc *Context) SetLineCapRound() {
+	dc.lineCap = LineCapRound
+}
+
+func (dc *Context) SetLineCapButt() {
+	dc.lineCap = LineCapButt
+}
+
+func (dc *Context) SetLineCapSquare() {
+	dc.lineCap = LineCapSquare
+}
+
+func (dc *Context) SetLineJoin(lineJoin LineJoin) {
+	dc.lineJoin = lineJoin
+}
+
+func (dc *Context) SetLineJoinRound() {
+	dc.lineJoin = LineJoinRound
+}
+
+func (dc *Context) SetLineJoinBevel() {
+	dc.lineJoin = LineJoinBevel
+}
+
+func (dc *Context) SetFillRule(fillRule FillRule) {
+	dc.fillRule = fillRule
+}
+
+func (dc *Context) SetFillRuleWinding() {
+	dc.fillRule = FillRuleWinding
+}
+
+func (dc *Context) SetFillRuleEvenOdd() {
+	dc.fillRule = FillRuleEvenOdd
+}
+
+// Color Setters
+
+func (dc *Context) setFillAndStrokeColor(c color.Color) {
+	dc.color = c
+	dc.fillPattern = NewSolidPattern(c)
+	dc.strokePattern = NewSolidPattern(c)
+}
+
+// SetFillStyle sets current fill style
+func (dc *Context) SetFillStyle(pattern Pattern) {
+	// if pattern is SolidPattern, also change dc.color(for dc.Clear, dc.drawString)
+	if fillStyle, ok := pattern.(*solidPattern); ok {
+		dc.color = fillStyle.color
+	}
+	dc.fillPattern = pattern
+}
+
+// SetStrokeStyle sets current stroke style
+func (dc *Context) SetStrokeStyle(pattern Pattern) {
+	dc.strokePattern = pattern
+}
+
+// SetColor sets the current color(for both fill and stroke).
+func (dc *Context) SetColor(c color.Color) {
+	dc.setFillAndStrokeColor(c)
+}
+
+// SetHexColor sets the current color using a hex string. The leading pound
+// sign (#) is optional. Both 3- and 6-digit variations are supported. 8 digits
+// may be provided to set the alpha value as well.
+func (dc *Context) SetHexColor(x string) {
+	r, g, b, a := parseHexColor(x)
+	dc.SetRGBA255(r, g, b, a)
+}
+
+// SetRGBA255 sets the current color. r, g, b, a values should be between 0 and
+// 255, inclusive.
+func (dc *Context) SetRGBA255(r, g, b, a int) {
+	dc.color = color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)}
+	dc.setFillAndStrokeColor(dc.color)
+}
+
+// SetRGB255 sets the current color. r, g, b values should be between 0 and 255,
+// inclusive. Alpha will be set to 255 (fully opaque).
+func (dc *Context) SetRGB255(r, g, b int) {
+	dc.SetRGBA255(r, g, b, 255)
+}
+
+// SetRGBA sets the current color. r, g, b, a values should be between 0 and 1,
+// inclusive.
+func (dc *Context) SetRGBA(r, g, b, a float64) {
+	dc.color = color.NRGBA{
+		uint8(r * 255),
+		uint8(g * 255),
+		uint8(b * 255),
+		uint8(a * 255),
+	}
+	dc.setFillAndStrokeColor(dc.color)
+}
+
+// SetRGB sets the current color. r, g, b values should be between 0 and 1,
+// inclusive. Alpha will be set to 1 (fully opaque).
+func (dc *Context) SetRGB(r, g, b float64) {
+	dc.SetRGBA(r, g, b, 1)
+}
+
+// Path Manipulation
+
+// MoveTo starts a new subpath within the current path starting at the
+// specified point.
+func (dc *Context) MoveTo(x, y float64) {
+	if dc.hasCurrent {
+		dc.fillPath.Add1(dc.start.Fixed())
+	}
+	x, y = dc.TransformPoint(x, y)
+	p := Point{x, y}
+	dc.strokePath.Start(p.Fixed())
+	dc.fillPath.Start(p.Fixed())
+	dc.start = p
+	dc.current = p
+	dc.hasCurrent = true
+}
+
+// LineTo adds a line segment to the current path starting at the current
+// point. If there is no current point, it is equivalent to MoveTo(x, y)
+func (dc *Context) LineTo(x, y float64) {
+	if !dc.hasCurrent {
+		dc.MoveTo(x, y)
+	} else {
+		x, y = dc.TransformPoint(x, y)
+		p := Point{x, y}
+		dc.strokePath.Add1(p.Fixed())
+		dc.fillPath.Add1(p.Fixed())
+		dc.current = p
+	}
+}
+
+// QuadraticTo adds a quadratic bezier curve to the current path starting at
+// the current point. If there is no current point, it first performs
+// MoveTo(x1, y1)
+func (dc *Context) QuadraticTo(x1, y1, x2, y2 float64) {
+	if !dc.hasCurrent {
+		dc.MoveTo(x1, y1)
+	}
+	x1, y1 = dc.TransformPoint(x1, y1)
+	x2, y2 = dc.TransformPoint(x2, y2)
+	p1 := Point{x1, y1}
+	p2 := Point{x2, y2}
+	dc.strokePath.Add2(p1.Fixed(), p2.Fixed())
+	dc.fillPath.Add2(p1.Fixed(), p2.Fixed())
+	dc.current = p2
+}
+
+// CubicTo adds a cubic bezier curve to the current path starting at the
+// current point. If there is no current point, it first performs
+// MoveTo(x1, y1). Because freetype/raster does not support cubic beziers,
+// this is emulated with many small line segments.
+func (dc *Context) CubicTo(x1, y1, x2, y2, x3, y3 float64) {
+	if !dc.hasCurrent {
+		dc.MoveTo(x1, y1)
+	}
+	x0, y0 := dc.current.X, dc.current.Y
+	x1, y1 = dc.TransformPoint(x1, y1)
+	x2, y2 = dc.TransformPoint(x2, y2)
+	x3, y3 = dc.TransformPoint(x3, y3)
+	points := CubicBezier(x0, y0, x1, y1, x2, y2, x3, y3)
+	previous := dc.current.Fixed()
+	for _, p := range points[1:] {
+		f := p.Fixed()
+		if f == previous {
+			// TODO: this fixes some rendering issues but not all
+			continue
+		}
+		previous = f
+		dc.strokePath.Add1(f)
+		dc.fillPath.Add1(f)
+		dc.current = p
+	}
+}
+
+// ClosePath adds a line segment from the current point to the beginning
+// of the current subpath. If there is no current point, this is a no-op.
+func (dc *Context) ClosePath() {
+	if dc.hasCurrent {
+		dc.strokePath.Add1(dc.start.Fixed())
+		dc.fillPath.Add1(dc.start.Fixed())
+		dc.current = dc.start
+	}
+}
+
+// ClearPath clears the current path. There is no current point after this
+// operation.
+func (dc *Context) ClearPath() {
+	dc.strokePath.Clear()
+	dc.fillPath.Clear()
+	dc.hasCurrent = false
+}
+
+// NewSubPath starts a new subpath within the current path. There is no current
+// point after this operation.
+func (dc *Context) NewSubPath() {
+	if dc.hasCurrent {
+		dc.fillPath.Add1(dc.start.Fixed())
+	}
+	dc.hasCurrent = false
+}
+
+// Path Drawing
+
+func (dc *Context) capper() raster.Capper {
+	switch dc.lineCap {
+	case LineCapButt:
+		return raster.ButtCapper
+	case LineCapRound:
+		return raster.RoundCapper
+	case LineCapSquare:
+		return raster.SquareCapper
+	}
+	return nil
+}
+
+func (dc *Context) joiner() raster.Joiner {
+	switch dc.lineJoin {
+	case LineJoinBevel:
+		return raster.BevelJoiner
+	case LineJoinRound:
+		return raster.RoundJoiner
+	}
+	return nil
+}
+
+func (dc *Context) stroke(painter raster.Painter) {
+	path := dc.strokePath
+	if len(dc.dashes) > 0 {
+		path = dashed(path, dc.dashes)
+	} else {
+		// TODO: this is a temporary workaround to remove tiny segments
+		// that result in rendering issues
+		path = rasterPath(flattenPath(path))
+	}
+	r := raster.NewRasterizer(dc.width, dc.height)
+	r.UseNonZeroWinding = true
+	r.AddStroke(path, fix(dc.lineWidth), dc.capper(), dc.joiner())
+	r.Rasterize(painter)
+}
+
+func (dc *Context) fill(painter raster.Painter) {
+	path := dc.fillPath
+	if dc.hasCurrent {
+		path = make(raster.Path, len(dc.fillPath))
+		copy(path, dc.fillPath)
+		path.Add1(dc.start.Fixed())
+	}
+	r := raster.NewRasterizer(dc.width, dc.height)
+	r.UseNonZeroWinding = dc.fillRule == FillRuleWinding
+	r.AddPath(path)
+	r.Rasterize(painter)
+}
+
+// StrokePreserve strokes the current path with the current color, line width,
+// line cap, line join and dash settings. The path is preserved after this
+// operation.
+func (dc *Context) StrokePreserve() {
+	painter := newPatternPainter(dc.im, dc.mask, dc.strokePattern)
+	dc.stroke(painter)
+}
+
+// Stroke strokes the current path with the current color, line width,
+// line cap, line join and dash settings. The path is cleared after this
+// operation.
+func (dc *Context) Stroke() {
+	dc.StrokePreserve()
+	dc.ClearPath()
+}
+
+// FillPreserve fills the current path with the current color. Open subpaths
+// are implicity closed. The path is preserved after this operation.
+func (dc *Context) FillPreserve() {
+	painter := newPatternPainter(dc.im, dc.mask, dc.fillPattern)
+	dc.fill(painter)
+}
+
+// Fill fills the current path with the current color. Open subpaths
+// are implicity closed. The path is cleared after this operation.
+func (dc *Context) Fill() {
+	dc.FillPreserve()
+	dc.ClearPath()
+}
+
+// ClipPreserve updates the clipping region by intersecting the current
+// clipping region with the current path as it would be filled by dc.Fill().
+// The path is preserved after this operation.
+func (dc *Context) ClipPreserve() {
+	clip := image.NewAlpha(image.Rect(0, 0, dc.width, dc.height))
+	painter := raster.NewAlphaOverPainter(clip)
+	dc.fill(painter)
+	if dc.mask == nil {
+		dc.mask = clip
+	} else {
+		mask := image.NewAlpha(image.Rect(0, 0, dc.width, dc.height))
+		draw.DrawMask(mask, mask.Bounds(), clip, image.ZP, dc.mask, image.ZP, draw.Over)
+		dc.mask = mask
+	}
+}
+
+// Clip updates the clipping region by intersecting the current
+// clipping region with the current path as it would be filled by dc.Fill().
+// The path is cleared after this operation.
+func (dc *Context) Clip() {
+	dc.ClipPreserve()
+	dc.ClearPath()
+}
+
+// ResetClip clears the clipping region.
+func (dc *Context) ResetClip() {
+	dc.mask = nil
+}
+
+// Convenient Drawing Functions
+
+// Clear fills the entire image with the current color.
+func (dc *Context) Clear() {
+	src := image.NewUniform(dc.color)
+	draw.Draw(dc.im, dc.im.Bounds(), src, image.ZP, draw.Src)
+}
+
+// SetPixel sets the color of the specified pixel using the current color.
+func (dc *Context) SetPixel(x, y int) {
+	dc.im.Set(x, y, dc.color)
+}
+
+// DrawPoint is like DrawCircle but ensures that a circle of the specified
+// size is drawn regardless of the current transformation matrix. The position
+// is still transformed, but not the shape of the point.
+func (dc *Context) DrawPoint(x, y, r float64) {
+	dc.Push()
+	tx, ty := dc.TransformPoint(x, y)
+	dc.Identity()
+	dc.DrawCircle(tx, ty, r)
+	dc.Pop()
+}
+
+func (dc *Context) DrawLine(x1, y1, x2, y2 float64) {
+	dc.MoveTo(x1, y1)
+	dc.LineTo(x2, y2)
+}
+
+func (dc *Context) DrawRectangle(x, y, w, h float64) {
+	dc.NewSubPath()
+	dc.MoveTo(x, y)
+	dc.LineTo(x+w, y)
+	dc.LineTo(x+w, y+h)
+	dc.LineTo(x, y+h)
+	dc.ClosePath()
+}
+
+func (dc *Context) DrawRoundedRectangle(x, y, w, h, r float64) {
+	x0, x1, x2, x3 := x, x+r, x+w-r, x+w
+	y0, y1, y2, y3 := y, y+r, y+h-r, y+h
+	dc.NewSubPath()
+	dc.MoveTo(x1, y0)
+	dc.LineTo(x2, y0)
+	dc.DrawArc(x2, y1, r, Radians(270), Radians(360))
+	dc.LineTo(x3, y2)
+	dc.DrawArc(x2, y2, r, Radians(0), Radians(90))
+	dc.LineTo(x1, y3)
+	dc.DrawArc(x1, y2, r, Radians(90), Radians(180))
+	dc.LineTo(x0, y1)
+	dc.DrawArc(x1, y1, r, Radians(180), Radians(270))
+	dc.ClosePath()
+}
+
+func (dc *Context) DrawEllipticalArc(x, y, rx, ry, angle1, angle2 float64) {
+	const n = 16
+	for i := 0; i < n; i++ {
+		p1 := float64(i+0) / n
+		p2 := float64(i+1) / n
+		a1 := angle1 + (angle2-angle1)*p1
+		a2 := angle1 + (angle2-angle1)*p2
+		x0 := x + rx*math.Cos(a1)
+		y0 := y + ry*math.Sin(a1)
+		x1 := x + rx*math.Cos(a1+(a2-a1)/2)
+		y1 := y + ry*math.Sin(a1+(a2-a1)/2)
+		x2 := x + rx*math.Cos(a2)
+		y2 := y + ry*math.Sin(a2)
+		cx := 2*x1 - x0/2 - x2/2
+		cy := 2*y1 - y0/2 - y2/2
+		if i == 0 && !dc.hasCurrent {
+			dc.MoveTo(x0, y0)
+		}
+		dc.QuadraticTo(cx, cy, x2, y2)
+	}
+}
+
+func (dc *Context) DrawEllipse(x, y, rx, ry float64) {
+	dc.NewSubPath()
+	dc.DrawEllipticalArc(x, y, rx, ry, 0, 2*math.Pi)
+	dc.ClosePath()
+}
+
+func (dc *Context) DrawArc(x, y, r, angle1, angle2 float64) {
+	dc.DrawEllipticalArc(x, y, r, r, angle1, angle2)
+}
+
+func (dc *Context) DrawCircle(x, y, r float64) {
+	dc.NewSubPath()
+	dc.DrawEllipticalArc(x, y, r, r, 0, 2*math.Pi)
+	dc.ClosePath()
+}
+
+func (dc *Context) DrawRegularPolygon(n int, x, y, r, rotation float64) {
+	angle := 2 * math.Pi / float64(n)
+	rotation -= math.Pi / 2
+	if n%2 == 0 {
+		rotation += angle / 2
+	}
+	dc.NewSubPath()
+	for i := 0; i < n; i++ {
+		a := rotation + angle*float64(i)
+		dc.LineTo(x+r*math.Cos(a), y+r*math.Sin(a))
+	}
+	dc.ClosePath()
+}
+
+// DrawImage draws the specified image at the specified point.
+// Currently, rotation and scaling transforms are not supported.
+func (dc *Context) DrawImage(im image.Image, x, y int) {
+	dc.DrawImageAnchored(im, x, y, 0, 0)
+}
+
+// DrawImageAnchored draws the specified image at the specified anchor point.
+// The anchor point is x - w * ax, y - h * ay, where w, h is the size of the
+// image. Use ax=0.5, ay=0.5 to center the image at the specified point.
+func (dc *Context) DrawImageAnchored(im image.Image, x, y int, ax, ay float64) {
+	s := im.Bounds().Size()
+	x -= int(ax * float64(s.X))
+	y -= int(ay * float64(s.Y))
+	p := image.Pt(x, y)
+	r := image.Rectangle{p, p.Add(s)}
+	if dc.mask == nil {
+		draw.Draw(dc.im, r, im, image.ZP, draw.Over)
+	} else {
+		draw.DrawMask(dc.im, r, im, image.ZP, dc.mask, p, draw.Over)
+	}
+}
+
+// Text Functions
+
+func (dc *Context) SetFontFace(fontFace font.Face) {
+	dc.fontFace = fontFace
+	dc.fontHeight = float64(fontFace.Metrics().Height) / 64
+}
+
+func (dc *Context) LoadFontFace(path string, points float64) error {
+	face, err := LoadFontFace(path, points)
+	if err == nil {
+		dc.fontFace = face
+		dc.fontHeight = points * 72 / 96
+	}
+	return err
+}
+
+func (dc *Context) drawString(im *image.RGBA, s string, x, y float64) {
+	d := &font.Drawer{
+		Dst:  im,
+		Src:  image.NewUniform(dc.color),
+		Face: dc.fontFace,
+		Dot:  fixp(x, y),
+	}
+	d.DrawString(s)
+}
+
+// DrawString draws the specified text at the specified point.
+// Currently, rotation and scaling transforms are not supported.
+func (dc *Context) DrawString(s string, x, y float64) {
+	dc.DrawStringAnchored(s, x, y, 0, 0)
+}
+
+// DrawStringAnchored draws the specified text at the specified anchor point.
+// The anchor point is x - w * ax, y - h * ay, where w, h is the size of the
+// text. Use ax=0.5, ay=0.5 to center the text at the specified point.
+func (dc *Context) DrawStringAnchored(s string, x, y, ax, ay float64) {
+	w, h := dc.MeasureString(s)
+	x, y = dc.TransformPoint(x, y)
+	x -= ax * w
+	y += ay * h
+	if dc.mask == nil {
+		dc.drawString(dc.im, s, x, y)
+	} else {
+		im := image.NewRGBA(image.Rect(0, 0, dc.width, dc.height))
+		dc.drawString(im, s, x, y)
+		draw.DrawMask(dc.im, dc.im.Bounds(), im, image.ZP, dc.mask, image.ZP, draw.Over)
+	}
+}
+
+// DrawStringWrapped word-wraps the specified string to the given max width
+// and then draws it at the specified anchor point using the given line
+// spacing and text alignment.
+func (dc *Context) DrawStringWrapped(s string, x, y, ax, ay, width, lineSpacing float64, align Align) {
+	lines := dc.WordWrap(s, width)
+	h := float64(len(lines)) * dc.fontHeight * lineSpacing
+	h -= (lineSpacing - 1) * dc.fontHeight
+	x -= ax * width
+	y -= ay * h
+	switch align {
+	case AlignLeft:
+		ax = 0
+	case AlignCenter:
+		ax = 0.5
+		x += width / 2
+	case AlignRight:
+		ax = 1
+		x += width
+	}
+	ay = 1
+	for _, line := range lines {
+		dc.DrawStringAnchored(line, x, y, ax, ay)
+		y += dc.fontHeight * lineSpacing
+	}
+}
+
+// MeasureString returns the rendered width and height of the specified text
+// given the current font face.
+func (dc *Context) MeasureString(s string) (w, h float64) {
+	d := &font.Drawer{
+		Face: dc.fontFace,
+	}
+	a := d.MeasureString(s)
+	return float64(a >> 6), dc.fontHeight
+}
+
+// WordWrap wraps the specified string to the given max width and current
+// font face.
+func (dc *Context) WordWrap(s string, w float64) []string {
+	return wordWrap(dc, s, w)
+}
+
+// Transformation Matrix Operations
+
+// Identity resets the current transformation matrix to the identity matrix.
+// This results in no translating, scaling, rotating, or shearing.
+func (dc *Context) Identity() {
+	dc.matrix = Identity()
+}
+
+// Translate updates the current matrix with a translation.
+func (dc *Context) Translate(x, y float64) {
+	dc.matrix = dc.matrix.Translate(x, y)
+}
+
+// Scale updates the current matrix with a scaling factor.
+// Scaling occurs about the origin.
+func (dc *Context) Scale(x, y float64) {
+	dc.matrix = dc.matrix.Scale(x, y)
+}
+
+// ScaleAbout updates the current matrix with a scaling factor.
+// Scaling occurs about the specified point.
+func (dc *Context) ScaleAbout(sx, sy, x, y float64) {
+	dc.Translate(x, y)
+	dc.Scale(sx, sy)
+	dc.Translate(-x, -y)
+}
+
+// Rotate updates the current matrix with a clockwise rotation.
+// Rotation occurs about the origin. Angle is specified in radians.
+func (dc *Context) Rotate(angle float64) {
+	dc.matrix = dc.matrix.Rotate(angle)
+}
+
+// RotateAbout updates the current matrix with a clockwise rotation.
+// Rotation occurs about the specified point. Angle is specified in radians.
+func (dc *Context) RotateAbout(angle, x, y float64) {
+	dc.Translate(x, y)
+	dc.Rotate(angle)
+	dc.Translate(-x, -y)
+}
+
+// Shear updates the current matrix with a shearing angle.
+// Shearing occurs about the origin.
+func (dc *Context) Shear(x, y float64) {
+	dc.matrix = dc.matrix.Shear(x, y)
+}
+
+// ShearAbout updates the current matrix with a shearing angle.
+// Shearing occurs about the specified point.
+func (dc *Context) ShearAbout(sx, sy, x, y float64) {
+	dc.Translate(x, y)
+	dc.Shear(sx, sy)
+	dc.Translate(-x, -y)
+}
+
+// TransformPoint multiplies the specified point by the current matrix,
+// returning a transformed position.
+func (dc *Context) TransformPoint(x, y float64) (tx, ty float64) {
+	return dc.matrix.TransformPoint(x, y)
+}
+
+// InvertY flips the Y axis so that Y grows from bottom to top and Y=0 is at
+// the bottom of the image.
+func (dc *Context) InvertY() {
+	dc.Translate(0, float64(dc.height))
+	dc.Scale(1, -1)
+}
+
+// Stack
+
+// Push saves the current state of the context for later retrieval. These
+// can be nested.
+func (dc *Context) Push() {
+	x := *dc
+	dc.stack = append(dc.stack, &x)
+}
+
+// Pop restores the last saved context state from the stack.
+func (dc *Context) Pop() {
+	before := *dc
+	s := dc.stack
+	x, s := s[len(s)-1], s[:len(s)-1]
+	*dc = *x
+	dc.mask = before.mask
+	dc.strokePath = before.strokePath
+	dc.fillPath = before.fillPath
+	dc.start = before.start
+	dc.current = before.current
+	dc.hasCurrent = before.hasCurrent
+}

vendor/github.com/fogleman/gg/examples/beziers.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"math/rand"
+
+	"github.com/fogleman/gg"
+)
+
+func random() float64 {
+	return rand.Float64()*2 - 1
+}
+
+func point() (x, y float64) {
+	return random(), random()
+}
+
+func drawCurve(dc *gg.Context) {
+	dc.SetRGBA(0, 0, 0, 0.1)
+	dc.FillPreserve()
+	dc.SetRGB(0, 0, 0)
+	dc.SetLineWidth(12)
+	dc.Stroke()
+}
+
+func drawPoints(dc *gg.Context) {
+	dc.SetRGBA(1, 0, 0, 0.5)
+	dc.SetLineWidth(2)
+	dc.Stroke()
+}
+
+func randomQuadratic(dc *gg.Context) {
+	x0, y0 := point()
+	x1, y1 := point()
+	x2, y2 := point()
+	dc.MoveTo(x0, y0)
+	dc.QuadraticTo(x1, y1, x2, y2)
+	drawCurve(dc)
+	dc.MoveTo(x0, y0)
+	dc.LineTo(x1, y1)
+	dc.LineTo(x2, y2)
+	drawPoints(dc)
+}
+
+func randomCubic(dc *gg.Context) {
+	x0, y0 := point()
+	x1, y1 := point()
+	x2, y2 := point()
+	x3, y3 := point()
+	dc.MoveTo(x0, y0)
+	dc.CubicTo(x1, y1, x2, y2, x3, y3)
+	drawCurve(dc)
+	dc.MoveTo(x0, y0)
+	dc.LineTo(x1, y1)
+	dc.LineTo(x2, y2)
+	dc.LineTo(x3, y3)
+	drawPoints(dc)
+}
+
+func main() {
+	const (
+		S = 256
+		W = 8
+		H = 8
+	)
+	dc := gg.NewContext(S*W, S*H)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	for j := 0; j < H; j++ {
+		for i := 0; i < W; i++ {
+			x := float64(i)*S + S/2
+			y := float64(j)*S + S/2
+			dc.Push()
+			dc.Translate(x, y)
+			dc.Scale(S/2, S/2)
+			if j%2 == 0 {
+				randomCubic(dc)
+			} else {
+				randomQuadratic(dc)
+			}
+			dc.Pop()
+		}
+	}
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/circle.go

@@ -0,0 +1,11 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	dc := gg.NewContext(1000, 1000)
+	dc.DrawCircle(500, 500, 400)
+	dc.SetRGB(0, 0, 0)
+	dc.Fill()
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/clip.go

@@ -0,0 +1,15 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	dc := gg.NewContext(1000, 1000)
+	dc.DrawCircle(350, 500, 300)
+	dc.Clip()
+	dc.DrawCircle(650, 500, 300)
+	dc.Clip()
+	dc.DrawRectangle(0, 0, 1000, 1000)
+	dc.SetRGB(0, 0, 0)
+	dc.Fill()
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/cubic.go

@@ -0,0 +1,38 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const S = 1000
+	dc := gg.NewContext(S, S)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	dc.Translate(S/2, S/2)
+	dc.Scale(40, 40)
+
+	var x0, y0, x1, y1, x2, y2, x3, y3 float64
+	x0, y0 = -10, 0
+	x1, y1 = -8, -8
+	x2, y2 = 8, 8
+	x3, y3 = 10, 0
+
+	dc.MoveTo(x0, y0)
+	dc.CubicTo(x1, y1, x2, y2, x3, y3)
+	dc.SetRGBA(0, 0, 0, 0.2)
+	dc.SetLineWidth(8)
+	dc.FillPreserve()
+	dc.SetRGB(0, 0, 0)
+	dc.SetDash(16, 24)
+	dc.Stroke()
+
+	dc.MoveTo(x0, y0)
+	dc.LineTo(x1, y1)
+	dc.LineTo(x2, y2)
+	dc.LineTo(x3, y3)
+	dc.SetRGBA(1, 0, 0, 0.4)
+	dc.SetLineWidth(2)
+	dc.SetDash(4, 8, 1, 8)
+	dc.Stroke()
+
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/ellipse.go

@@ -0,0 +1,20 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const S = 1024
+	dc := gg.NewContext(S, S)
+	dc.SetRGBA(0, 0, 0, 0.1)
+	for i := 0; i < 360; i += 15 {
+		dc.Push()
+		dc.RotateAbout(gg.Radians(float64(i)), S/2, S/2)
+		dc.DrawEllipse(S/2, S/2, S*7/16, S/8)
+		dc.Fill()
+		dc.Pop()
+	}
+	if im, err := gg.LoadImage("examples/gopher.png"); err == nil {
+		dc.DrawImageAnchored(im, S/2, S/2, 0.5, 0.5)
+	}
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/gradient-linear.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"image/color"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	dc := gg.NewContext(500, 400)
+
+	grad := gg.NewLinearGradient(20, 320, 400, 20)
+	grad.AddColorStop(0, color.RGBA{0, 255, 0, 255})
+	grad.AddColorStop(1, color.RGBA{0, 0, 255, 255})
+	grad.AddColorStop(0.5, color.RGBA{255, 0, 0, 255})
+
+	dc.SetColor(color.White)
+	dc.DrawRectangle(20, 20, 400-20, 300)
+	dc.Stroke()
+
+	dc.SetStrokeStyle(grad)
+	dc.SetLineWidth(4)
+	dc.MoveTo(10, 10)
+	dc.LineTo(410, 10)
+	dc.LineTo(410, 100)
+	dc.LineTo(10, 100)
+	dc.ClosePath()
+	dc.Stroke()
+
+	dc.SetFillStyle(grad)
+	dc.MoveTo(10, 120)
+	dc.LineTo(410, 120)
+	dc.LineTo(410, 300)
+	dc.LineTo(10, 300)
+	dc.ClosePath()
+	dc.Fill()
+
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/gradient-radial.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"image/color"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	dc := gg.NewContext(400, 200)
+
+	grad := gg.NewRadialGradient(100, 100, 10, 100, 120, 80)
+	grad.AddColorStop(0, color.RGBA{0, 255, 0, 255})
+	grad.AddColorStop(1, color.RGBA{0, 0, 255, 255})
+
+	dc.SetFillStyle(grad)
+	dc.DrawRectangle(0, 0, 200, 200)
+	dc.Fill()
+
+	dc.SetColor(color.White)
+	dc.DrawCircle(100, 100, 10)
+	dc.Stroke()
+	dc.DrawCircle(100, 120, 80)
+	dc.Stroke()
+
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/lines.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"math/rand"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	const W = 1024
+	const H = 1024
+	dc := gg.NewContext(W, H)
+	dc.SetRGB(0, 0, 0)
+	dc.Clear()
+	for i := 0; i < 1000; i++ {
+		x1 := rand.Float64() * W
+		y1 := rand.Float64() * H
+		x2 := rand.Float64() * W
+		y2 := rand.Float64() * H
+		r := rand.Float64()
+		g := rand.Float64()
+		b := rand.Float64()
+		a := rand.Float64()*0.5 + 0.5
+		w := rand.Float64()*4 + 1
+		dc.SetRGBA(r, g, b, a)
+		dc.SetLineWidth(w)
+		dc.DrawLine(x1, y1, x2, y2)
+		dc.Stroke()
+	}
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/linewidth.go

@@ -0,0 +1,19 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	dc := gg.NewContext(1000, 1000)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	dc.SetRGB(0, 0, 0)
+	w := 0.1
+	for i := 100; i <= 900; i += 20 {
+		x := float64(i)
+		dc.DrawLine(x+50, 0, x-50, 1000)
+		dc.SetLineWidth(w)
+		dc.Stroke()
+		w += 0.1
+	}
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/lorem.go

@@ -0,0 +1,28 @@
+package main
+
+import "github.com/fogleman/gg"
+
+var lines = []string{
+	"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod",
+	"tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,",
+	"quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo",
+	"consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse",
+	"cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat",
+	"non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
+}
+
+func main() {
+	const W = 800
+	const H = 400
+	dc := gg.NewContext(W, H)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	dc.SetRGB(0, 0, 0)
+	// dc.LoadFontFace("/Library/Fonts/Arial.ttf", 18)
+	const h = 24
+	for i, line := range lines {
+		y := H/2 - h*len(lines)/2 + i*h
+		dc.DrawStringAnchored(line, 400, float64(y), 0.5, 0.5)
+	}
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/mask.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"log"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	im, err := gg.LoadImage("examples/lenna.png")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	dc := gg.NewContext(512, 512)
+	dc.DrawRoundedRectangle(0, 0, 512, 512, 64)
+	dc.Clip()
+	dc.DrawImage(im, 0, 0)
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/meme.go

@@ -0,0 +1,30 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const S = 1024
+	dc := gg.NewContext(S, S)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	if err := dc.LoadFontFace("/Library/Fonts/Impact.ttf", 96); err != nil {
+		panic(err)
+	}
+	dc.SetRGB(0, 0, 0)
+	s := "ONE DOES NOT SIMPLY"
+	n := 6 // "stroke" size
+	for dy := -n; dy <= n; dy++ {
+		for dx := -n; dx <= n; dx++ {
+			if dx*dx+dy*dy >= n*n {
+				// give it rounded corners
+				continue
+			}
+			x := S/2 + float64(dx)
+			y := S/2 + float64(dy)
+			dc.DrawStringAnchored(s, x, y, 0.5, 0.5)
+		}
+	}
+	dc.SetRGB(1, 1, 1)
+	dc.DrawStringAnchored(s, S/2, S/2, 0.5, 0.5)
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/openfill.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"math"
+	"math/rand"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	dc := gg.NewContext(1000, 1000)
+	for j := 0; j < 10; j++ {
+		for i := 0; i < 10; i++ {
+			x := float64(i)*100 + 50
+			y := float64(j)*100 + 50
+			a1 := rand.Float64() * 2 * math.Pi
+			a2 := a1 + rand.Float64()*math.Pi + math.Pi/2
+			dc.DrawArc(x, y, 40, a1, a2)
+			// dc.ClosePath()
+		}
+	}
+	dc.SetRGB(0, 0, 0)
+	dc.FillPreserve()
+	dc.SetRGB(1, 1, 1)
+	dc.SetLineWidth(8)
+	dc.StrokePreserve()
+	dc.SetRGB(1, 0, 0)
+	dc.SetLineWidth(4)
+	dc.StrokePreserve()
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/pattern-fill.go

@@ -0,0 +1,20 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	im, err := gg.LoadPNG("examples/lenna.png")
+	if err != nil {
+		panic(err)
+	}
+	pattern := gg.NewSurfacePattern(im, gg.RepeatBoth)
+	dc := gg.NewContext(600, 600)
+	dc.MoveTo(20, 20)
+	dc.LineTo(590, 20)
+	dc.LineTo(590, 590)
+	dc.LineTo(20, 590)
+	dc.ClosePath()
+	dc.SetFillStyle(pattern)
+	dc.Fill()
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/quadratic.go

@@ -0,0 +1,54 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const S = 1000
+	dc := gg.NewContext(S, S)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	dc.Translate(S/2, S/2)
+	dc.Scale(40, 40)
+
+	var x0, y0, x1, y1, x2, y2, x3, y3, x4, y4 float64
+	x0, y0 = -10, 0
+	x1, y1 = -5, -10
+	x2, y2 = 0, 0
+	x3, y3 = 5, 10
+	x4, y4 = 10, 0
+
+	dc.MoveTo(x0, y0)
+	dc.LineTo(x1, y1)
+	dc.LineTo(x2, y2)
+	dc.LineTo(x3, y3)
+	dc.LineTo(x4, y4)
+	dc.SetHexColor("FF2D00")
+	dc.SetLineWidth(8)
+	dc.Stroke()
+
+	dc.MoveTo(x0, y0)
+	dc.QuadraticTo(x1, y1, x2, y2)
+	dc.QuadraticTo(x3, y3, x4, y4)
+	dc.SetHexColor("3E606F")
+	dc.SetLineWidth(16)
+	dc.FillPreserve()
+	dc.SetRGB(0, 0, 0)
+	dc.Stroke()
+
+	dc.DrawCircle(x0, y0, 0.5)
+	dc.DrawCircle(x1, y1, 0.5)
+	dc.DrawCircle(x2, y2, 0.5)
+	dc.DrawCircle(x3, y3, 0.5)
+	dc.DrawCircle(x4, y4, 0.5)
+	dc.SetRGB(1, 1, 1)
+	dc.FillPreserve()
+	dc.SetRGB(0, 0, 0)
+	dc.SetLineWidth(4)
+	dc.Stroke()
+
+	dc.LoadFontFace("/Library/Fonts/Arial.ttf", 200)
+	dc.DrawStringAnchored("g", -5, 5, 0.5, 0.5)
+	dc.DrawStringAnchored("G", 5, -5, 0.5, 0.5)
+
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/scatter.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"math/rand"
+
+	"github.com/fogleman/gg"
+)
+
+func CreatePoints(n int) []gg.Point {
+	points := make([]gg.Point, n)
+	for i := 0; i < n; i++ {
+		x := 0.5 + rand.NormFloat64()*0.1
+		y := x + rand.NormFloat64()*0.1
+		points[i] = gg.Point{x, y}
+	}
+	return points
+}
+
+func main() {
+	const S = 1024
+	const P = 64
+	dc := gg.NewContext(S, S)
+	dc.InvertY()
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	points := CreatePoints(1000)
+	dc.Translate(P, P)
+	dc.Scale(S-P*2, S-P*2)
+	// draw minor grid
+	for i := 1; i <= 10; i++ {
+		x := float64(i) / 10
+		dc.MoveTo(x, 0)
+		dc.LineTo(x, 1)
+		dc.MoveTo(0, x)
+		dc.LineTo(1, x)
+	}
+	dc.SetRGBA(0, 0, 0, 0.25)
+	dc.SetLineWidth(1)
+	dc.Stroke()
+	// draw axes
+	dc.MoveTo(0, 0)
+	dc.LineTo(1, 0)
+	dc.MoveTo(0, 0)
+	dc.LineTo(0, 1)
+	dc.SetRGB(0, 0, 0)
+	dc.SetLineWidth(4)
+	dc.Stroke()
+	// draw points
+	dc.SetRGBA(0, 0, 1, 0.5)
+	for _, p := range points {
+		dc.DrawCircle(p.X, p.Y, 3.0/S)
+		dc.Fill()
+	}
+	// draw text
+	dc.Identity()
+	dc.SetRGB(0, 0, 0)
+	if err := dc.LoadFontFace("/Library/Fonts/Arial Bold.ttf", 24); err != nil {
+		panic(err)
+	}
+	dc.DrawStringAnchored("Chart Title", S/2, P/2, 0.5, 0.5)
+	if err := dc.LoadFontFace("/Library/Fonts/Arial.ttf", 18); err != nil {
+		panic(err)
+	}
+	dc.DrawStringAnchored("X Axis Title", S/2, S-P/2, 0.5, 0.5)
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/sine.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"math"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	const W = 1200
+	const H = 60
+	dc := gg.NewContext(W, H)
+	// dc.SetHexColor("#FFFFFF")
+	// dc.Clear()
+	dc.ScaleAbout(0.95, 0.75, W/2, H/2)
+	for i := 0; i < W; i++ {
+		a := float64(i) * 2 * math.Pi / W * 8
+		x := float64(i)
+		y := (math.Sin(a) + 1) / 2 * H
+		dc.LineTo(x, y)
+	}
+	dc.ClosePath()
+	dc.SetHexColor("#3E606F")
+	dc.FillPreserve()
+	dc.SetHexColor("#19344180")
+	dc.SetLineWidth(8)
+	dc.Stroke()
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/spiral.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"math"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	const S = 1024
+	const N = 2048
+	dc := gg.NewContext(S, S)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	dc.SetRGB(0, 0, 0)
+	for i := 0; i <= N; i++ {
+		t := float64(i) / N
+		d := t*S*0.4 + 10
+		a := t * math.Pi * 2 * 20
+		x := S/2 + math.Cos(a)*d
+		y := S/2 + math.Sin(a)*d
+		r := t * 8
+		dc.DrawCircle(x, y, r)
+	}
+	dc.Fill()
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/star.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"math"
+
+	"github.com/fogleman/gg"
+)
+
+type Point struct {
+	X, Y float64
+}
+
+func Polygon(n int, x, y, r float64) []Point {
+	result := make([]Point, n)
+	for i := 0; i < n; i++ {
+		a := float64(i)*2*math.Pi/float64(n) - math.Pi/2
+		result[i] = Point{x + r*math.Cos(a), y + r*math.Sin(a)}
+	}
+	return result
+}
+
+func main() {
+	n := 5
+	points := Polygon(n, 512, 512, 400)
+	dc := gg.NewContext(1024, 1024)
+	dc.SetHexColor("fff")
+	dc.Clear()
+	for i := 0; i < n+1; i++ {
+		index := (i * 2) % n
+		p := points[index]
+		dc.LineTo(p.X, p.Y)
+	}
+	dc.SetRGBA(0, 0.5, 0, 1)
+	dc.SetFillRule(gg.FillRuleEvenOdd)
+	dc.FillPreserve()
+	dc.SetRGBA(0, 1, 0, 0.5)
+	dc.SetLineWidth(16)
+	dc.Stroke()
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/stars.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"math"
+	"math/rand"
+
+	"github.com/fogleman/gg"
+)
+
+type Point struct {
+	X, Y float64
+}
+
+func Polygon(n int) []Point {
+	result := make([]Point, n)
+	for i := 0; i < n; i++ {
+		a := float64(i)*2*math.Pi/float64(n) - math.Pi/2
+		result[i] = Point{math.Cos(a), math.Sin(a)}
+	}
+	return result
+}
+
+func main() {
+	const W = 1200
+	const H = 120
+	const S = 100
+	dc := gg.NewContext(W, H)
+	dc.SetHexColor("#FFFFFF")
+	dc.Clear()
+	n := 5
+	points := Polygon(n)
+	for x := S / 2; x < W; x += S {
+		dc.Push()
+		s := rand.Float64()*S/4 + S/4
+		dc.Translate(float64(x), H/2)
+		dc.Rotate(rand.Float64() * 2 * math.Pi)
+		dc.Scale(s, s)
+		for i := 0; i < n+1; i++ {
+			index := (i * 2) % n
+			p := points[index]
+			dc.LineTo(p.X, p.Y)
+		}
+		dc.SetLineWidth(10)
+		dc.SetHexColor("#FFCC00")
+		dc.StrokePreserve()
+		dc.SetHexColor("#FFE43A")
+		dc.Fill()
+		dc.Pop()
+	}
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/text.go

@@ -0,0 +1,16 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const S = 1024
+	dc := gg.NewContext(S, S)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	dc.SetRGB(0, 0, 0)
+	if err := dc.LoadFontFace("/Library/Fonts/Arial.ttf", 96); err != nil {
+		panic(err)
+	}
+	dc.DrawStringAnchored("Hello, world!", S/2, S/2, 0.5, 0.5)
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/tiling.go

@@ -0,0 +1,21 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const NX = 4
+	const NY = 3
+	im, err := gg.LoadPNG("examples/gopher.png")
+	if err != nil {
+		panic(err)
+	}
+	w := im.Bounds().Size().X
+	h := im.Bounds().Size().Y
+	dc := gg.NewContext(w*NX, h*NY)
+	for y := 0; y < NY; y++ {
+		for x := 0; x < NX; x++ {
+			dc.DrawImage(im, x*w, y*h)
+		}
+	}
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/examples/wrap.go

@@ -0,0 +1,40 @@
+package main
+
+import "github.com/fogleman/gg"
+
+const TEXT = "Call me Ishmael. Some years ago—never mind how long precisely—having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world. It is a way I have of driving off the spleen and regulating the circulation. Whenever I find myself growing grim about the mouth; whenever it is a damp, drizzly November in my soul; whenever I find myself involuntarily pausing before coffin warehouses, and bringing up the rear of every funeral I meet; and especially whenever my hypos get such an upper hand of me, that it requires a strong moral principle to prevent me from deliberately stepping into the street, and methodically knocking people's hats off—then, I account it high time to get to sea as soon as I can. This is my substitute for pistol and ball. With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship. There is nothing surprising in this. If they but knew it, almost all men in their degree, some time or other, cherish very nearly the same feelings towards the ocean with me."
+
+func main() {
+	const W = 1024
+	const H = 1024
+	const P = 16
+	dc := gg.NewContext(W, H)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	dc.DrawLine(W/2, 0, W/2, H)
+	dc.DrawLine(0, H/2, W, H/2)
+	dc.DrawRectangle(P, P, W-P-P, H-P-P)
+	dc.SetRGBA(0, 0, 1, 0.25)
+	dc.SetLineWidth(3)
+	dc.Stroke()
+	dc.SetRGB(0, 0, 0)
+	if err := dc.LoadFontFace("/Library/Fonts/Arial Bold.ttf", 18); err != nil {
+		panic(err)
+	}
+	dc.DrawStringWrapped("UPPER LEFT", P, P, 0, 0, 0, 1.5, gg.AlignLeft)
+	dc.DrawStringWrapped("UPPER RIGHT", W-P, P, 1, 0, 0, 1.5, gg.AlignRight)
+	dc.DrawStringWrapped("BOTTOM LEFT", P, H-P, 0, 1, 0, 1.5, gg.AlignLeft)
+	dc.DrawStringWrapped("BOTTOM RIGHT", W-P, H-P, 1, 1, 0, 1.5, gg.AlignRight)
+	dc.DrawStringWrapped("UPPER MIDDLE", W/2, P, 0.5, 0, 0, 1.5, gg.AlignCenter)
+	dc.DrawStringWrapped("LOWER MIDDLE", W/2, H-P, 0.5, 1, 0, 1.5, gg.AlignCenter)
+	dc.DrawStringWrapped("LEFT MIDDLE", P, H/2, 0, 0.5, 0, 1.5, gg.AlignLeft)
+	dc.DrawStringWrapped("RIGHT MIDDLE", W-P, H/2, 1, 0.5, 0, 1.5, gg.AlignRight)
+	if err := dc.LoadFontFace("/Library/Fonts/Arial.ttf", 12); err != nil {
+		panic(err)  
+	}
+	dc.DrawStringWrapped(TEXT, W/2-P, H/2-P, 1, 1, W/3, 1.75, gg.AlignLeft)
+	dc.DrawStringWrapped(TEXT, W/2+P, H/2-P, 0, 1, W/3, 2, gg.AlignLeft)
+	dc.DrawStringWrapped(TEXT, W/2-P, H/2+P, 1, 0, W/3, 2.25, gg.AlignLeft)
+	dc.DrawStringWrapped(TEXT, W/2+P, H/2+P, 0, 0, W/3, 2.5, gg.AlignLeft)
+	dc.SavePNG("out.png")
+}

vendor/github.com/fogleman/gg/gradient.go

@@ -0,0 +1,202 @@
+package gg
+
+import (
+	"image/color"
+	"math"
+	"sort"
+)
+
+type stop struct {
+	pos   float64
+	color color.Color
+}
+
+type stops []stop
+
+// Len satisfies the Sort interface.
+func (s stops) Len() int {
+	return len(s)
+}
+
+// Less satisfies the Sort interface.
+func (s stops) Less(i, j int) bool {
+	return s[i].pos < s[j].pos
+}
+
+// Swap satisfies the Sort interface.
+func (s stops) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+type Gradient interface {
+	Pattern
+	AddColorStop(offset float64, color color.Color)
+}
+
+// Linear Gradient
+type linearGradient struct {
+	x0, y0, x1, y1 float64
+	stops          stops
+}
+
+func (g *linearGradient) ColorAt(x, y int) color.Color {
+	if len(g.stops) == 0 {
+		return color.Transparent
+	}
+
+	fx, fy := float64(x), float64(y)
+	x0, y0, x1, y1 := g.x0, g.y0, g.x1, g.y1
+	dx, dy := x1-x0, y1-y0
+
+	// Horizontal
+	if dy == 0 && dx != 0 {
+		return getColor((fx-x0)/dx, g.stops)
+	}
+
+	// Vertical
+	if dx == 0 && dy != 0 {
+		return getColor((fy-y0)/dy, g.stops)
+	}
+
+	// Dot product
+	s0 := dx*(fx-x0) + dy*(fy-y0)
+	if s0 < 0 {
+		return g.stops[0].color
+	}
+	// Calculate distance to (x0,y0) alone (x0,y0)->(x1,y1)
+	mag := math.Hypot(dx, dy)
+	u := ((fx-x0)*-dy + (fy-y0)*dx) / (mag * mag)
+	x2, y2 := x0+u*-dy, y0+u*dx
+	d := math.Hypot(fx-x2, fy-y2) / mag
+	return getColor(d, g.stops)
+}
+
+func (g *linearGradient) AddColorStop(offset float64, color color.Color) {
+	g.stops = append(g.stops, stop{pos: offset, color: color})
+	sort.Sort(g.stops)
+}
+
+func NewLinearGradient(x0, y0, x1, y1 float64) Gradient {
+	g := &linearGradient{
+		x0: x0, y0: y0,
+		x1: x1, y1: y1,
+	}
+	return g
+}
+
+// Radial Gradient
+type circle struct {
+	x, y, r float64
+}
+
+type radialGradient struct {
+	c0, c1, cd circle
+	a, inva    float64
+	mindr      float64
+	stops      stops
+}
+
+func dot3(x0, y0, z0, x1, y1, z1 float64) float64 {
+	return x0*x1 + y0*y1 + z0*z1
+}
+
+func (g *radialGradient) ColorAt(x, y int) color.Color {
+	if len(g.stops) == 0 {
+		return color.Transparent
+	}
+
+	// copy from pixman's pixman-radial-gradient.c
+
+	dx, dy := float64(x)+0.5-g.c0.x, float64(y)+0.5-g.c0.y
+	b := dot3(dx, dy, g.c0.r, g.cd.x, g.cd.y, g.cd.r)
+	c := dot3(dx, dy, -g.c0.r, dx, dy, g.c0.r)
+
+	if g.a == 0 {
+		if b == 0 {
+			return color.Transparent
+		}
+		t := 0.5 * c / b
+		if t*g.cd.r >= g.mindr {
+			return getColor(t, g.stops)
+		}
+		return color.Transparent
+	}
+
+	discr := dot3(b, g.a, 0, b, -c, 0)
+	if discr >= 0 {
+		sqrtdiscr := math.Sqrt(discr)
+		t0 := (b + sqrtdiscr) * g.inva
+		t1 := (b - sqrtdiscr) * g.inva
+
+		if t0*g.cd.r >= g.mindr {
+			return getColor(t0, g.stops)
+		} else if t1*g.cd.r >= g.mindr {
+			return getColor(t1, g.stops)
+		}
+	}
+
+	return color.Transparent
+}
+
+func (g *radialGradient) AddColorStop(offset float64, color color.Color) {
+	g.stops = append(g.stops, stop{pos: offset, color: color})
+	sort.Sort(g.stops)
+}
+
+func NewRadialGradient(x0, y0, r0, x1, y1, r1 float64) Gradient {
+	c0 := circle{x0, y0, r0}
+	c1 := circle{x1, y1, r1}
+	cd := circle{x1 - x0, y1 - y0, r1 - r0}
+	a := dot3(cd.x, cd.y, -cd.r, cd.x, cd.y, cd.r)
+	var inva float64
+	if a != 0 {
+		inva = 1.0 / a
+	}
+	mindr := -c0.r
+	g := &radialGradient{
+		c0:    c0,
+		c1:    c1,
+		cd:    cd,
+		a:     a,
+		inva:  inva,
+		mindr: mindr,
+	}
+	return g
+}
+
+func getColor(pos float64, stops stops) color.Color {
+	if pos <= 0.0 || len(stops) == 1 {
+		return stops[0].color
+	}
+
+	last := stops[len(stops)-1]
+
+	if pos >= last.pos {
+		return last.color
+	}
+
+	for i, stop := range stops[1:] {
+		if pos < stop.pos {
+			pos = (pos - stops[i].pos) / (stop.pos - stops[i].pos)
+			return colorLerp(stops[i].color, stop.color, pos)
+		}
+	}
+
+	return last.color
+}
+
+func colorLerp(c0, c1 color.Color, t float64) color.Color {
+	r0, g0, b0, a0 := c0.RGBA()
+	r1, g1, b1, a1 := c1.RGBA()
+
+	return color.NRGBA{
+		lerp(r0, r1, t),
+		lerp(g0, g1, t),
+		lerp(b0, b1, t),
+		lerp(a0, a1, t),
+	}
+}
+
+func lerp(a, b uint32, t float64) uint8 {
+	return uint8(int32(float64(a)*(1.0-t)+float64(b)*t) >> 8)
+}

vendor/github.com/fogleman/gg/matrix.go

@@ -0,0 +1,88 @@
+package gg
+
+import "math"
+
+type Matrix struct {
+	XX, YX, XY, YY, X0, Y0 float64
+}
+
+func Identity() Matrix {
+	return Matrix{
+		1, 0,
+		0, 1,
+		0, 0,
+	}
+}
+
+func Translate(x, y float64) Matrix {
+	return Matrix{
+		1, 0,
+		0, 1,
+		x, y,
+	}
+}
+
+func Scale(x, y float64) Matrix {
+	return Matrix{
+		x, 0,
+		0, y,
+		0, 0,
+	}
+}
+
+func Rotate(angle float64) Matrix {
+	c := math.Cos(angle)
+	s := math.Sin(angle)
+	return Matrix{
+		c, s,
+		-s, c,
+		0, 0,
+	}
+}
+
+func Shear(x, y float64) Matrix {
+	return Matrix{
+		1, y,
+		x, 1,
+		0, 0,
+	}
+}
+
+func (a Matrix) Multiply(b Matrix) Matrix {
+	return Matrix{
+		a.XX*b.XX + a.YX*b.XY,
+		a.XX*b.YX + a.YX*b.YY,
+		a.XY*b.XX + a.YY*b.XY,
+		a.XY*b.YX + a.YY*b.YY,
+		a.X0*b.XX + a.Y0*b.XY + b.X0,
+		a.X0*b.YX + a.Y0*b.YY + b.Y0,
+	}
+}
+
+func (a Matrix) TransformVector(x, y float64) (tx, ty float64) {
+	tx = a.XX*x + a.XY*y
+	ty = a.YX*x + a.YY*y
+	return
+}
+
+func (a Matrix) TransformPoint(x, y float64) (tx, ty float64) {
+	tx = a.XX*x + a.XY*y + a.X0
+	ty = a.YX*x + a.YY*y + a.Y0
+	return
+}
+
+func (a Matrix) Translate(x, y float64) Matrix {
+	return Translate(x, y).Multiply(a)
+}
+
+func (a Matrix) Scale(x, y float64) Matrix {
+	return Scale(x, y).Multiply(a)
+}
+
+func (a Matrix) Rotate(angle float64) Matrix {
+	return Rotate(angle).Multiply(a)
+}
+
+func (a Matrix) Shear(x, y float64) Matrix {
+	return Shear(x, y).Multiply(a)
+}

vendor/github.com/fogleman/gg/path.go

@@ -0,0 +1,140 @@
+package gg
+
+import (
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/math/fixed"
+)
+
+func flattenPath(p raster.Path) [][]Point {
+	var result [][]Point
+	var path []Point
+	var cx, cy float64
+	for i := 0; i < len(p); {
+		switch p[i] {
+		case 0:
+			if len(path) > 0 {
+				result = append(result, path)
+				path = nil
+			}
+			x := unfix(p[i+1])
+			y := unfix(p[i+2])
+			path = append(path, Point{x, y})
+			cx, cy = x, y
+			i += 4
+		case 1:
+			x := unfix(p[i+1])
+			y := unfix(p[i+2])
+			path = append(path, Point{x, y})
+			cx, cy = x, y
+			i += 4
+		case 2:
+			x1 := unfix(p[i+1])
+			y1 := unfix(p[i+2])
+			x2 := unfix(p[i+3])
+			y2 := unfix(p[i+4])
+			points := QuadraticBezier(cx, cy, x1, y1, x2, y2)
+			path = append(path, points...)
+			cx, cy = x2, y2
+			i += 6
+		case 3:
+			x1 := unfix(p[i+1])
+			y1 := unfix(p[i+2])
+			x2 := unfix(p[i+3])
+			y2 := unfix(p[i+4])
+			x3 := unfix(p[i+5])
+			y3 := unfix(p[i+6])
+			points := CubicBezier(cx, cy, x1, y1, x2, y2, x3, y3)
+			path = append(path, points...)
+			cx, cy = x3, y3
+			i += 8
+		default:
+			panic("bad path")
+		}
+	}
+	if len(path) > 0 {
+		result = append(result, path)
+	}
+	return result
+}
+
+func dashPath(paths [][]Point, dashes []float64) [][]Point {
+	var result [][]Point
+	if len(dashes) == 0 {
+		return paths
+	}
+	if len(dashes) == 1 {
+		dashes = append(dashes, dashes[0])
+	}
+	for _, path := range paths {
+		if len(path) < 2 {
+			continue
+		}
+		previous := path[0]
+		pathIndex := 1
+		dashIndex := 0
+		segmentLength := 0.0
+		var segment []Point
+		segment = append(segment, previous)
+		for pathIndex < len(path) {
+			dashLength := dashes[dashIndex]
+			point := path[pathIndex]
+			d := previous.Distance(point)
+			maxd := dashLength - segmentLength
+			if d > maxd {
+				t := maxd / d
+				p := previous.Interpolate(point, t)
+				segment = append(segment, p)
+				if dashIndex%2 == 0 && len(segment) > 1 {
+					result = append(result, segment)
+				}
+				segment = nil
+				segment = append(segment, p)
+				segmentLength = 0
+				previous = p
+				dashIndex = (dashIndex + 1) % len(dashes)
+			} else {
+				segment = append(segment, point)
+				previous = point
+				segmentLength += d
+				pathIndex++
+			}
+		}
+		if dashIndex%2 == 0 && len(segment) > 1 {
+			result = append(result, segment)
+		}
+	}
+	return result
+}
+
+func rasterPath(paths [][]Point) raster.Path {
+	var result raster.Path
+	for _, path := range paths {
+		var previous fixed.Point26_6
+		for i, point := range path {
+			f := point.Fixed()
+			if i == 0 {
+				result.Start(f)
+			} else {
+				dx := f.X - previous.X
+				dy := f.Y - previous.Y
+				if dx < 0 {
+					dx = -dx
+				}
+				if dy < 0 {
+					dy = -dy
+				}
+				if dx+dy > 8 {
+					// TODO: this is a hack for cases where two points are
+					// too close - causes rendering issues with joins / caps
+					result.Add1(f)
+				}
+			}
+			previous = f
+		}
+	}
+	return result
+}
+
+func dashed(path raster.Path, dashes []float64) raster.Path {
+	return rasterPath(dashPath(flattenPath(path), dashes))
+}

vendor/github.com/fogleman/gg/pattern.go

@@ -0,0 +1,123 @@
+package gg
+
+import (
+	"image"
+	"image/color"
+
+	"github.com/golang/freetype/raster"
+)
+
+type RepeatOp int
+
+const (
+	RepeatBoth RepeatOp = iota
+	RepeatX
+	RepeatY
+	RepeatNone
+)
+
+type Pattern interface {
+	ColorAt(x, y int) color.Color
+}
+
+// Solid Pattern
+type solidPattern struct {
+	color color.Color
+}
+
+func (p *solidPattern) ColorAt(x, y int) color.Color {
+	return p.color
+}
+
+func NewSolidPattern(color color.Color) Pattern {
+	return &solidPattern{color: color}
+}
+
+// Surface Pattern
+type surfacePattern struct {
+	im image.Image
+	op RepeatOp
+}
+
+func (p *surfacePattern) ColorAt(x, y int) color.Color {
+	b := p.im.Bounds()
+	switch p.op {
+	case RepeatX:
+		if y >= b.Dy() {
+			return color.Transparent
+		}
+	case RepeatY:
+		if x >= b.Dx() {
+			return color.Transparent
+		}
+	case RepeatNone:
+		if x >= b.Dx() || y >= b.Dy() {
+			return color.Transparent
+		}
+	}
+	x = x%b.Dx() + b.Min.X
+	y = y%b.Dy() + b.Min.Y
+	return p.im.At(x, y)
+}
+
+func NewSurfacePattern(im image.Image, op RepeatOp) Pattern {
+	return &surfacePattern{im: im, op: op}
+}
+
+type patternPainter struct {
+	im   *image.RGBA
+	mask *image.Alpha
+	p    Pattern
+}
+
+// Paint satisfies the Painter interface.
+func (r *patternPainter) Paint(ss []raster.Span, done bool) {
+	b := r.im.Bounds()
+	for _, s := range ss {
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		const m = 1<<16 - 1
+		y := s.Y - r.im.Rect.Min.Y
+		x0 := s.X0 - r.im.Rect.Min.X
+		// RGBAPainter.Paint() in $GOPATH/src/github.com/golang/freetype/raster/paint.go
+		i0 := (s.Y-r.im.Rect.Min.Y)*r.im.Stride + (s.X0-r.im.Rect.Min.X)*4
+		i1 := i0 + (s.X1-s.X0)*4
+		for i, x := i0, x0; i < i1; i, x = i+4, x+1 {
+			ma := s.Alpha
+			if r.mask != nil {
+				ma = ma * uint32(r.mask.AlphaAt(x, y).A) / 255
+				if ma == 0 {
+					continue
+				}
+			}
+			c := r.p.ColorAt(x, y)
+			cr, cg, cb, ca := c.RGBA()
+			dr := uint32(r.im.Pix[i+0])
+			dg := uint32(r.im.Pix[i+1])
+			db := uint32(r.im.Pix[i+2])
+			da := uint32(r.im.Pix[i+3])
+			a := (m - (ca * ma / m)) * 0x101
+			r.im.Pix[i+0] = uint8((dr*a + cr*ma) / m >> 8)
+			r.im.Pix[i+1] = uint8((dg*a + cg*ma) / m >> 8)
+			r.im.Pix[i+2] = uint8((db*a + cb*ma) / m >> 8)
+			r.im.Pix[i+3] = uint8((da*a + ca*ma) / m >> 8)
+		}
+	}
+}
+
+func newPatternPainter(im *image.RGBA, mask *image.Alpha, p Pattern) *patternPainter {
+	return &patternPainter{im, mask, p}
+}

vendor/github.com/fogleman/gg/point.go

@@ -0,0 +1,25 @@
+package gg
+
+import (
+	"math"
+
+	"golang.org/x/image/math/fixed"
+)
+
+type Point struct {
+	X, Y float64
+}
+
+func (a Point) Fixed() fixed.Point26_6 {
+	return fixp(a.X, a.Y)
+}
+
+func (a Point) Distance(b Point) float64 {
+	return math.Hypot(a.X-b.X, a.Y-b.Y)
+}
+
+func (a Point) Interpolate(b Point, t float64) Point {
+	x := a.X + (b.X-a.X)*t
+	y := a.Y + (b.Y-a.Y)*t
+	return Point{x, y}
+}

vendor/github.com/fogleman/gg/util.go

@@ -0,0 +1,117 @@
+package gg
+
+import (
+	"fmt"
+	"image"
+	"image/draw"
+	_ "image/jpeg"
+	"image/png"
+	"io/ioutil"
+	"math"
+	"os"
+	"strings"
+
+	"github.com/golang/freetype/truetype"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func Radians(degrees float64) float64 {
+	return degrees * math.Pi / 180
+}
+
+func Degrees(radians float64) float64 {
+	return radians * 180 / math.Pi
+}
+
+func LoadImage(path string) (image.Image, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	im, _, err := image.Decode(file)
+	return im, err
+}
+
+func LoadPNG(path string) (image.Image, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	return png.Decode(file)
+}
+
+func SavePNG(path string, im image.Image) error {
+	file, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	return png.Encode(file, im)
+}
+
+func imageToRGBA(src image.Image) *image.RGBA {
+	dst := image.NewRGBA(src.Bounds())
+	draw.Draw(dst, dst.Rect, src, image.ZP, draw.Src)
+	return dst
+}
+
+func parseHexColor(x string) (r, g, b, a int) {
+	x = strings.TrimPrefix(x, "#")
+	a = 255
+	if len(x) == 3 {
+		format := "%1x%1x%1x"
+		fmt.Sscanf(x, format, &r, &g, &b)
+		r |= r << 4
+		g |= g << 4
+		b |= b << 4
+	}
+	if len(x) == 6 {
+		format := "%02x%02x%02x"
+		fmt.Sscanf(x, format, &r, &g, &b)
+	}
+	if len(x) == 8 {
+		format := "%02x%02x%02x%02x"
+		fmt.Sscanf(x, format, &r, &g, &b, &a)
+	}
+	return
+}
+
+func fixp(x, y float64) fixed.Point26_6 {
+	return fixed.Point26_6{fix(x), fix(y)}
+}
+
+func fix(x float64) fixed.Int26_6 {
+	return fixed.Int26_6(x * 64)
+}
+
+func unfix(x fixed.Int26_6) float64 {
+	const shift, mask = 6, 1<<6 - 1
+	if x >= 0 {
+		return float64(x>>shift) + float64(x&mask)/64
+	}
+	x = -x
+	if x >= 0 {
+		return -(float64(x>>shift) + float64(x&mask)/64)
+	}
+	return 0
+}
+
+func LoadFontFace(path string, points float64) (font.Face, error) {
+	fontBytes, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	f, err := truetype.Parse(fontBytes)
+	if err != nil {
+		return nil, err
+	}
+	face := truetype.NewFace(f, &truetype.Options{
+		Size: points,
+		// Hinting: font.HintingFull,
+	})
+	return face, nil
+}

vendor/github.com/fogleman/gg/wrap.go

@@ -0,0 +1,58 @@
+package gg
+
+import (
+	"strings"
+	"unicode"
+)
+
+type measureStringer interface {
+	MeasureString(s string) (w, h float64)
+}
+
+func splitOnSpace(x string) []string {
+	var result []string
+	pi := 0
+	ps := false
+	for i, c := range x {
+		s := unicode.IsSpace(c)
+		if s != ps && i > 0 {
+			result = append(result, x[pi:i])
+			pi = i
+		}
+		ps = s
+	}
+	result = append(result, x[pi:])
+	return result
+}
+
+func wordWrap(m measureStringer, s string, width float64) []string {
+	var result []string
+	for _, line := range strings.Split(s, "\n") {
+		fields := splitOnSpace(line)
+		if len(fields)%2 == 1 {
+			fields = append(fields, "")
+		}
+		x := ""
+		for i := 0; i < len(fields); i += 2 {
+			w, _ := m.MeasureString(x + fields[i])
+			if w > width {
+				if x == "" {
+					result = append(result, fields[i])
+					x = ""
+					continue
+				} else {
+					result = append(result, x)
+					x = ""
+				}
+			}
+			x += fields[i] + fields[i+1]
+		}
+		if x != "" {
+			result = append(result, x)
+		}
+	}
+	for i, line := range result {
+		result[i] = strings.TrimSpace(line)
+	}
+	return result
+}

vendor/github.com/golang/freetype/AUTHORS

@@ -0,0 +1,20 @@
+# This is the official list of Freetype-Go authors for copyright purposes.
+# This file is distinct from the CONTRIBUTORS files.
+# See the latter for an explanation.
+#
+# Freetype-Go is derived from Freetype, which is written in C. The latter
+# is copyright 1996-2010 David Turner, Robert Wilhelm, and Werner Lemberg.
+
+# Names should be added to this file as
+#	Name or Organization <email address>
+# The email address is not required for organizations.
+
+# Please keep the list sorted.
+
+Google Inc.
+Jeff R. Allen <jra@nella.org>
+Maksim Kochkin <maxxarts@gmail.com>
+Michael Fogleman <fogleman@gmail.com>
+Rémy Oudompheng <oudomphe@phare.normalesup.org>
+Roger Peppe <rogpeppe@gmail.com>
+Steven Edwards <steven@stephenwithav.com>

vendor/github.com/golang/freetype/CONTRIBUTORS

@@ -0,0 +1,38 @@
+# This is the official list of people who can contribute
+# (and typically have contributed) code to the Freetype-Go repository.
+# The AUTHORS file lists the copyright holders; this file
+# lists people.  For example, Google employees are listed here
+# but not in AUTHORS, because Google holds the copyright.
+#
+# The submission process automatically checks to make sure
+# that people submitting code are listed in this file (by email address).
+#
+# Names should be added to this file only after verifying that
+# the individual or the individual's organization has agreed to
+# the appropriate Contributor License Agreement, found here:
+#
+#     http://code.google.com/legal/individual-cla-v1.0.html
+#     http://code.google.com/legal/corporate-cla-v1.0.html
+#
+# The agreement for individuals can be filled out on the web.
+#
+# When adding J Random Contributor's name to this file,
+# either J's name or J's organization's name should be
+# added to the AUTHORS file, depending on whether the
+# individual or corporate CLA was used.
+
+# Names should be added to this file like so:
+#     Name <email address>
+
+# Please keep the list sorted.
+
+Andrew Gerrand <adg@golang.org>
+Jeff R. Allen <jra@nella.org> <jeff.allen@gmail.com>
+Maksim Kochkin <maxxarts@gmail.com>
+Michael Fogleman <fogleman@gmail.com>
+Nigel Tao <nigeltao@golang.org>
+Rémy Oudompheng <oudomphe@phare.normalesup.org> <remyoudompheng@gmail.com>
+Rob Pike <r@golang.org>
+Roger Peppe <rogpeppe@gmail.com>
+Russ Cox <rsc@golang.org>
+Steven Edwards <steven@stephenwithav.com>

vendor/github.com/golang/freetype/LICENSE

@@ -0,0 +1,12 @@
+Use of the Freetype-Go software is subject to your choice of exactly one of
+the following two licenses:
+  * The FreeType License, which is similar to the original BSD license with
+    an advertising clause, or
+  * The GNU General Public License (GPL), version 2 or later.
+
+The text of these licenses are available in the licenses/ftl.txt and the
+licenses/gpl.txt files respectively. They are also available at
+http://freetype.sourceforge.net/license.html
+
+The Luxi fonts in the testdata directory are licensed separately. See the
+testdata/COPYING file for details.

vendor/github.com/golang/freetype/README

@@ -0,0 +1,21 @@
+The Freetype font rasterizer in the Go programming language.
+
+To download and install from source:
+$ go get github.com/golang/freetype
+
+It is an incomplete port:
+  * It only supports TrueType fonts, and not Type 1 fonts nor bitmap fonts.
+  * It only supports the Unicode encoding.
+
+There are also some implementation differences:
+  * It uses a 26.6 fixed point co-ordinate system everywhere internally,
+    as opposed to the original Freetype's mix of 26.6 (or 10.6 for 16-bit
+    systems) in some places, and 24.8 in the "smooth" rasterizer.
+
+Freetype-Go is derived from Freetype, which is written in C. Freetype is
+copyright 1996-2010 David Turner, Robert Wilhelm, and Werner Lemberg.
+Freetype-Go is copyright The Freetype-Go Authors, who are listed in the
+AUTHORS file.
+
+Unless otherwise noted, the Freetype-Go source files are distributed
+under the BSD-style license found in the LICENSE file.

vendor/github.com/golang/freetype/cmd/print-glyph-points/main.c

@@ -0,0 +1,87 @@
+/*
+gcc main.c -I/usr/include/freetype2 -lfreetype && ./a.out 12 ../../testdata/luxisr.ttf with_hinting
+*/
+
+#include <stdio.h>
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+void usage(char** argv) {
+	fprintf(stderr, "usage: %s font_size font_file [with_hinting|sans_hinting]\n", argv[0]);
+}
+
+int main(int argc, char** argv) {
+	FT_Error error;
+	FT_Library library;
+	FT_Face face;
+	FT_Glyph_Metrics* m;
+	FT_Outline* o;
+	FT_Int major, minor, patch;
+	int i, j, font_size, no_hinting;
+
+	if (argc != 4) {
+		usage(argv);
+		return 1;
+	}
+	font_size = atoi(argv[1]);
+	if (font_size <= 0) {
+		fprintf(stderr, "invalid font_size\n");
+		usage(argv);
+		return 1;
+	}
+	if (!strcmp(argv[3], "with_hinting")) {
+		no_hinting = 0;
+	} else if (!strcmp(argv[3], "sans_hinting")) {
+		no_hinting = 1;
+	} else {
+		fprintf(stderr, "neither \"with_hinting\" nor \"sans_hinting\"\n");
+		usage(argv);
+		return 1;
+	};
+	error = FT_Init_FreeType(&library);
+	if (error) {
+		fprintf(stderr, "FT_Init_FreeType: error #%d\n", error);
+		return 1;
+	}
+	FT_Library_Version(library, &major, &minor, &patch);
+	printf("freetype version %d.%d.%d\n", major, minor, patch);
+	error = FT_New_Face(library, argv[2], 0, &face);
+	if (error) {
+		fprintf(stderr, "FT_New_Face: error #%d\n", error);
+		return 1;
+	}
+	error = FT_Set_Char_Size(face, 0, font_size*64, 0, 0);
+	if (error) {
+		fprintf(stderr, "FT_Set_Char_Size: error #%d\n", error);
+		return 1;
+	}
+	for (i = 0; i < face->num_glyphs; i++) {
+		error = FT_Load_Glyph(face, i, no_hinting ? FT_LOAD_NO_HINTING : FT_LOAD_DEFAULT);
+		if (error) {
+			fprintf(stderr, "FT_Load_Glyph: glyph %d: error #%d\n", i, error);
+			return 1;
+		}
+		if (face->glyph->format != FT_GLYPH_FORMAT_OUTLINE) {
+			fprintf(stderr, "glyph format for glyph %d is not FT_GLYPH_FORMAT_OUTLINE\n", i);
+			return 1;
+		}
+		m = &face->glyph->metrics;
+		/* Print what Go calls the AdvanceWidth, and then: XMin, YMin, XMax, YMax. */
+		printf("%ld %ld %ld %ld %ld;",
+				m->horiAdvance,
+				m->horiBearingX,
+				m->horiBearingY - m->height,
+				m->horiBearingX + m->width,
+				m->horiBearingY);
+		/* Print the glyph points. */
+		o = &face->glyph->outline;
+		for (j = 0; j < o->n_points; j++) {
+			if (j != 0) {
+				printf(", ");
+			}
+			printf("%ld %ld %d", o->points[j].x, o->points[j].y, o->tags[j] & 0x01);
+		}
+		printf("\n");
+	}
+	return 0;
+}

vendor/github.com/golang/freetype/example/capjoin/main.go

@@ -0,0 +1,85 @@
+// Copyright 2016 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// +build example
+//
+// This build tag means that "go install github.com/golang/freetype/..."
+// doesn't install this example program. Use "go run main.go" to run it or "go
+// install -tags=example" to install it.
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"log"
+	"os"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/math/fixed"
+)
+
+func main() {
+	const (
+		w = 400
+		h = 400
+	)
+	r := raster.NewRasterizer(w, h)
+	r.UseNonZeroWinding = true
+
+	cjs := []struct {
+		c raster.Capper
+		j raster.Joiner
+	}{
+		{raster.RoundCapper, raster.RoundJoiner},
+		{raster.ButtCapper, raster.BevelJoiner},
+		{raster.SquareCapper, raster.BevelJoiner},
+	}
+
+	for i, cj := range cjs {
+		var path raster.Path
+		path.Start(fixed.P(30+100*i, 30+120*i))
+		path.Add1(fixed.P(180+100*i, 80+120*i))
+		path.Add1(fixed.P(50+100*i, 130+120*i))
+		raster.Stroke(r, path, fixed.I(20), cj.c, cj.j)
+	}
+
+	rgba := image.NewRGBA(image.Rect(0, 0, w, h))
+	draw.Draw(rgba, rgba.Bounds(), image.Black, image.Point{}, draw.Src)
+	p := raster.NewRGBAPainter(rgba)
+	p.SetColor(color.RGBA{0x7f, 0x7f, 0x7f, 0xff})
+	r.Rasterize(p)
+
+	white := color.RGBA{0xff, 0xff, 0xff, 0xff}
+	for i := range cjs {
+		rgba.SetRGBA(30+100*i, 30+120*i, white)
+		rgba.SetRGBA(180+100*i, 80+120*i, white)
+		rgba.SetRGBA(50+100*i, 130+120*i, white)
+	}
+
+	// Save that RGBA image to disk.
+	outFile, err := os.Create("out.png")
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	defer outFile.Close()
+	b := bufio.NewWriter(outFile)
+	err = png.Encode(b, rgba)
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	err = b.Flush()
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("Wrote out.png OK.")
+}

vendor/github.com/golang/freetype/example/drawer/main.go

@@ -0,0 +1,158 @@
+// Copyright 2015 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// +build example
+//
+// This build tag means that "go install github.com/golang/freetype/..."
+// doesn't install this example program. Use "go run main.go" to run it or "go
+// install -tags=example" to install it.
+
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"io/ioutil"
+	"log"
+	"math"
+	"os"
+
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+var (
+	dpi      = flag.Float64("dpi", 72, "screen resolution in Dots Per Inch")
+	fontfile = flag.String("fontfile", "../../testdata/luxisr.ttf", "filename of the ttf font")
+	hinting  = flag.String("hinting", "none", "none | full")
+	size     = flag.Float64("size", 12, "font size in points")
+	spacing  = flag.Float64("spacing", 1.5, "line spacing (e.g. 2 means double spaced)")
+	wonb     = flag.Bool("whiteonblack", false, "white text on a black background")
+)
+
+const title = "Jabberwocky"
+
+var text = []string{
+	"’Twas brillig, and the slithy toves",
+	"Did gyre and gimble in the wabe;",
+	"All mimsy were the borogoves,",
+	"And the mome raths outgrabe.",
+	"",
+	"“Beware the Jabberwock, my son!",
+	"The jaws that bite, the claws that catch!",
+	"Beware the Jubjub bird, and shun",
+	"The frumious Bandersnatch!”",
+	"",
+	"He took his vorpal sword in hand:",
+	"Long time the manxome foe he sought—",
+	"So rested he by the Tumtum tree,",
+	"And stood awhile in thought.",
+	"",
+	"And as in uffish thought he stood,",
+	"The Jabberwock, with eyes of flame,",
+	"Came whiffling through the tulgey wood,",
+	"And burbled as it came!",
+	"",
+	"One, two! One, two! and through and through",
+	"The vorpal blade went snicker-snack!",
+	"He left it dead, and with its head",
+	"He went galumphing back.",
+	"",
+	"“And hast thou slain the Jabberwock?",
+	"Come to my arms, my beamish boy!",
+	"O frabjous day! Callooh! Callay!”",
+	"He chortled in his joy.",
+	"",
+	"’Twas brillig, and the slithy toves",
+	"Did gyre and gimble in the wabe;",
+	"All mimsy were the borogoves,",
+	"And the mome raths outgrabe.",
+}
+
+func main() {
+	flag.Parse()
+
+	// Read the font data.
+	fontBytes, err := ioutil.ReadFile(*fontfile)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	f, err := truetype.Parse(fontBytes)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	// Draw the background and the guidelines.
+	fg, bg := image.Black, image.White
+	ruler := color.RGBA{0xdd, 0xdd, 0xdd, 0xff}
+	if *wonb {
+		fg, bg = image.White, image.Black
+		ruler = color.RGBA{0x22, 0x22, 0x22, 0xff}
+	}
+	const imgW, imgH = 640, 480
+	rgba := image.NewRGBA(image.Rect(0, 0, imgW, imgH))
+	draw.Draw(rgba, rgba.Bounds(), bg, image.ZP, draw.Src)
+	for i := 0; i < 200; i++ {
+		rgba.Set(10, 10+i, ruler)
+		rgba.Set(10+i, 10, ruler)
+	}
+
+	// Draw the text.
+	h := font.HintingNone
+	switch *hinting {
+	case "full":
+		h = font.HintingFull
+	}
+	d := &font.Drawer{
+		Dst: rgba,
+		Src: fg,
+		Face: truetype.NewFace(f, &truetype.Options{
+			Size:    *size,
+			DPI:     *dpi,
+			Hinting: h,
+		}),
+	}
+	y := 10 + int(math.Ceil(*size**dpi/72))
+	dy := int(math.Ceil(*size * *spacing * *dpi / 72))
+	d.Dot = fixed.Point26_6{
+		X: (fixed.I(imgW) - d.MeasureString(title)) / 2,
+		Y: fixed.I(y),
+	}
+	d.DrawString(title)
+	y += dy
+	for _, s := range text {
+		d.Dot = fixed.P(10, y)
+		d.DrawString(s)
+		y += dy
+	}
+
+	// Save that RGBA image to disk.
+	outFile, err := os.Create("out.png")
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	defer outFile.Close()
+	b := bufio.NewWriter(outFile)
+	err = png.Encode(b, rgba)
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	err = b.Flush()
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("Wrote out.png OK.")
+}

vendor/github.com/golang/freetype/example/freetype/main.go

@@ -0,0 +1,150 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// +build example
+//
+// This build tag means that "go install github.com/golang/freetype/..."
+// doesn't install this example program. Use "go run main.go" to run it or "go
+// install -tags=example" to install it.
+
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"io/ioutil"
+	"log"
+	"os"
+
+	"github.com/golang/freetype"
+	"golang.org/x/image/font"
+)
+
+var (
+	dpi      = flag.Float64("dpi", 72, "screen resolution in Dots Per Inch")
+	fontfile = flag.String("fontfile", "../../testdata/luxisr.ttf", "filename of the ttf font")
+	hinting  = flag.String("hinting", "none", "none | full")
+	size     = flag.Float64("size", 12, "font size in points")
+	spacing  = flag.Float64("spacing", 1.5, "line spacing (e.g. 2 means double spaced)")
+	wonb     = flag.Bool("whiteonblack", false, "white text on a black background")
+)
+
+var text = []string{
+	"’Twas brillig, and the slithy toves",
+	"Did gyre and gimble in the wabe;",
+	"All mimsy were the borogoves,",
+	"And the mome raths outgrabe.",
+	"",
+	"“Beware the Jabberwock, my son!",
+	"The jaws that bite, the claws that catch!",
+	"Beware the Jubjub bird, and shun",
+	"The frumious Bandersnatch!”",
+	"",
+	"He took his vorpal sword in hand:",
+	"Long time the manxome foe he sought—",
+	"So rested he by the Tumtum tree,",
+	"And stood awhile in thought.",
+	"",
+	"And as in uffish thought he stood,",
+	"The Jabberwock, with eyes of flame,",
+	"Came whiffling through the tulgey wood,",
+	"And burbled as it came!",
+	"",
+	"One, two! One, two! and through and through",
+	"The vorpal blade went snicker-snack!",
+	"He left it dead, and with its head",
+	"He went galumphing back.",
+	"",
+	"“And hast thou slain the Jabberwock?",
+	"Come to my arms, my beamish boy!",
+	"O frabjous day! Callooh! Callay!”",
+	"He chortled in his joy.",
+	"",
+	"’Twas brillig, and the slithy toves",
+	"Did gyre and gimble in the wabe;",
+	"All mimsy were the borogoves,",
+	"And the mome raths outgrabe.",
+}
+
+func main() {
+	flag.Parse()
+
+	// Read the font data.
+	fontBytes, err := ioutil.ReadFile(*fontfile)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	f, err := freetype.ParseFont(fontBytes)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	// Initialize the context.
+	fg, bg := image.Black, image.White
+	ruler := color.RGBA{0xdd, 0xdd, 0xdd, 0xff}
+	if *wonb {
+		fg, bg = image.White, image.Black
+		ruler = color.RGBA{0x22, 0x22, 0x22, 0xff}
+	}
+	rgba := image.NewRGBA(image.Rect(0, 0, 640, 480))
+	draw.Draw(rgba, rgba.Bounds(), bg, image.ZP, draw.Src)
+	c := freetype.NewContext()
+	c.SetDPI(*dpi)
+	c.SetFont(f)
+	c.SetFontSize(*size)
+	c.SetClip(rgba.Bounds())
+	c.SetDst(rgba)
+	c.SetSrc(fg)
+	switch *hinting {
+	default:
+		c.SetHinting(font.HintingNone)
+	case "full":
+		c.SetHinting(font.HintingFull)
+	}
+
+	// Draw the guidelines.
+	for i := 0; i < 200; i++ {
+		rgba.Set(10, 10+i, ruler)
+		rgba.Set(10+i, 10, ruler)
+	}
+
+	// Draw the text.
+	pt := freetype.Pt(10, 10+int(c.PointToFixed(*size)>>6))
+	for _, s := range text {
+		_, err = c.DrawString(s, pt)
+		if err != nil {
+			log.Println(err)
+			return
+		}
+		pt.Y += c.PointToFixed(*size * *spacing)
+	}
+
+	// Save that RGBA image to disk.
+	outFile, err := os.Create("out.png")
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	defer outFile.Close()
+	b := bufio.NewWriter(outFile)
+	err = png.Encode(b, rgba)
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	err = b.Flush()
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("Wrote out.png OK.")
+}

vendor/github.com/golang/freetype/example/gamma/main.go

@@ -0,0 +1,86 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// +build example
+//
+// This build tag means that "go install github.com/golang/freetype/..."
+// doesn't install this example program. Use "go run main.go" to run it or "go
+// install -tags=example" to install it.
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"image"
+	"image/draw"
+	"image/png"
+	"log"
+	"os"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/math/fixed"
+)
+
+func p(x, y int) fixed.Point26_6 {
+	return fixed.Point26_6{
+		X: fixed.Int26_6(x * 64),
+		Y: fixed.Int26_6(y * 64),
+	}
+}
+
+func main() {
+	// Draw a rounded corner that is one pixel wide.
+	r := raster.NewRasterizer(50, 50)
+	r.Start(p(5, 5))
+	r.Add1(p(5, 25))
+	r.Add2(p(5, 45), p(25, 45))
+	r.Add1(p(45, 45))
+	r.Add1(p(45, 44))
+	r.Add1(p(26, 44))
+	r.Add2(p(6, 44), p(6, 24))
+	r.Add1(p(6, 5))
+	r.Add1(p(5, 5))
+
+	// Rasterize that curve multiple times at different gammas.
+	const (
+		w = 600
+		h = 200
+	)
+	rgba := image.NewRGBA(image.Rect(0, 0, w, h))
+	draw.Draw(rgba, image.Rect(0, 0, w, h/2), image.Black, image.ZP, draw.Src)
+	draw.Draw(rgba, image.Rect(0, h/2, w, h), image.White, image.ZP, draw.Src)
+	mask := image.NewAlpha(image.Rect(0, 0, 50, 50))
+	painter := raster.NewAlphaSrcPainter(mask)
+	gammas := []float64{1.0 / 10.0, 1.0 / 3.0, 1.0 / 2.0, 2.0 / 3.0, 4.0 / 5.0, 1.0, 5.0 / 4.0, 3.0 / 2.0, 2.0, 3.0, 10.0}
+	for i, g := range gammas {
+		draw.Draw(mask, mask.Bounds(), image.Transparent, image.ZP, draw.Src)
+		r.Rasterize(raster.NewGammaCorrectionPainter(painter, g))
+		x, y := 50*i+25, 25
+		draw.DrawMask(rgba, image.Rect(x, y, x+50, y+50), image.White, image.ZP, mask, image.ZP, draw.Over)
+		y += 100
+		draw.DrawMask(rgba, image.Rect(x, y, x+50, y+50), image.Black, image.ZP, mask, image.ZP, draw.Over)
+	}
+
+	// Save that RGBA image to disk.
+	outFile, err := os.Create("out.png")
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	defer outFile.Close()
+	b := bufio.NewWriter(outFile)
+	err = png.Encode(b, rgba)
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	err = b.Flush()
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("Wrote out.png OK.")
+}

vendor/github.com/golang/freetype/example/genbasicfont/main.go

@@ -0,0 +1,237 @@
+// Copyright 2016 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// +build example
+//
+// This build tag means that "go install github.com/golang/freetype/..."
+// doesn't install this example program. Use "go run main.go" to run it or "go
+// install -tags=example" to install it.
+
+// Program genbasicfont generates Go source code that imports
+// golang.org/x/image/font/basicfont to provide a fixed width font face.
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"go/format"
+	"image"
+	"image/draw"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"strings"
+	"unicode"
+
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+var (
+	fontfile = flag.String("fontfile", "../../testdata/luxisr.ttf", "filename or URL of the TTF font")
+	hinting  = flag.String("hinting", "none", "none, vertical or full")
+	pkg      = flag.String("pkg", "example", "the package name for the generated code")
+	size     = flag.Float64("size", 12, "the number of pixels in 1 em")
+	vr       = flag.String("var", "example", "the variable name for the generated code")
+)
+
+func loadFontFile() ([]byte, error) {
+	if strings.HasPrefix(*fontfile, "http://") || strings.HasPrefix(*fontfile, "https://") {
+		resp, err := http.Get(*fontfile)
+		if err != nil {
+			return nil, err
+		}
+		defer resp.Body.Close()
+		return ioutil.ReadAll(resp.Body)
+	}
+	return ioutil.ReadFile(*fontfile)
+}
+
+func parseHinting(h string) font.Hinting {
+	switch h {
+	case "full":
+		return font.HintingFull
+	case "vertical":
+		log.Fatal("TODO: have package truetype implement vertical hinting")
+		return font.HintingVertical
+	}
+	return font.HintingNone
+}
+
+func privateUseArea(r rune) bool {
+	return 0xe000 <= r && r <= 0xf8ff ||
+		0xf0000 <= r && r <= 0xffffd ||
+		0x100000 <= r && r <= 0x10fffd
+}
+
+func loadRanges(f *truetype.Font) (ret [][2]rune) {
+	rr := [2]rune{-1, -1}
+	for r := rune(0); r <= unicode.MaxRune; r++ {
+		if privateUseArea(r) {
+			continue
+		}
+		if f.Index(r) == 0 {
+			continue
+		}
+		if rr[1] == r {
+			rr[1] = r + 1
+			continue
+		}
+		if rr[0] != -1 {
+			ret = append(ret, rr)
+		}
+		rr = [2]rune{r, r + 1}
+	}
+	if rr[0] != -1 {
+		ret = append(ret, rr)
+	}
+	return ret
+}
+
+func emptyCol(m *image.Gray, r image.Rectangle, x int) bool {
+	for y := r.Min.Y; y < r.Max.Y; y++ {
+		if m.GrayAt(x, y).Y > 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func emptyRow(m *image.Gray, r image.Rectangle, y int) bool {
+	for x := r.Min.X; x < r.Max.X; x++ {
+		if m.GrayAt(x, y).Y > 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func tightBounds(m *image.Gray) (r image.Rectangle) {
+	r = m.Bounds()
+	for ; r.Min.Y < r.Max.Y && emptyRow(m, r, r.Min.Y+0); r.Min.Y++ {
+	}
+	for ; r.Min.Y < r.Max.Y && emptyRow(m, r, r.Max.Y-1); r.Max.Y-- {
+	}
+	for ; r.Min.X < r.Max.X && emptyCol(m, r, r.Min.X+0); r.Min.X++ {
+	}
+	for ; r.Min.X < r.Max.X && emptyCol(m, r, r.Max.X-1); r.Max.X-- {
+	}
+	return r
+}
+
+func printPix(ranges [][2]rune, glyphs map[rune]*image.Gray, b image.Rectangle) []byte {
+	buf := new(bytes.Buffer)
+	for _, rr := range ranges {
+		for r := rr[0]; r < rr[1]; r++ {
+			m := glyphs[r]
+			fmt.Fprintf(buf, "// U+%08x '%c'\n", r, r)
+			for y := b.Min.Y; y < b.Max.Y; y++ {
+				for x := b.Min.X; x < b.Max.X; x++ {
+					fmt.Fprintf(buf, "%#02x, ", m.GrayAt(x, y).Y)
+				}
+				fmt.Fprintln(buf)
+			}
+			fmt.Fprintln(buf)
+		}
+	}
+	return buf.Bytes()
+}
+
+func printRanges(ranges [][2]rune) []byte {
+	buf := new(bytes.Buffer)
+	offset := 0
+	for _, rr := range ranges {
+		fmt.Fprintf(buf, "{'\\U%08x', '\\U%08x', %d},\n", rr[0], rr[1], offset)
+		offset += int(rr[1] - rr[0])
+	}
+	return buf.Bytes()
+}
+
+func main() {
+	flag.Parse()
+	b, err := loadFontFile()
+	if err != nil {
+		log.Fatal(err)
+	}
+	f, err := truetype.Parse(b)
+	if err != nil {
+		log.Fatal(err)
+	}
+	face := truetype.NewFace(f, &truetype.Options{
+		Size:    *size,
+		Hinting: parseHinting(*hinting),
+	})
+	defer face.Close()
+
+	fBounds := f.Bounds(fixed.Int26_6(*size * 64))
+	iBounds := image.Rect(
+		+fBounds.Min.X.Floor(),
+		-fBounds.Max.Y.Ceil(),
+		+fBounds.Max.X.Ceil(),
+		-fBounds.Min.Y.Floor(),
+	)
+
+	tBounds := image.Rectangle{}
+	glyphs := map[rune]*image.Gray{}
+	advance := fixed.Int26_6(-1)
+
+	ranges := loadRanges(f)
+	for _, rr := range ranges {
+		for r := rr[0]; r < rr[1]; r++ {
+			dr, mask, maskp, adv, ok := face.Glyph(fixed.Point26_6{}, r)
+			if !ok {
+				log.Fatalf("could not load glyph for %U", r)
+			}
+			if advance < 0 {
+				advance = adv
+			} else if advance != adv {
+				log.Fatalf("advance was not constant: got %v and %v", advance, adv)
+			}
+			dst := image.NewGray(iBounds)
+			draw.DrawMask(dst, dr, image.White, image.Point{}, mask, maskp, draw.Src)
+			glyphs[r] = dst
+			tBounds = tBounds.Union(tightBounds(dst))
+		}
+	}
+
+	// height is the glyph image height, not the inter-line spacing.
+	width, height := tBounds.Dx(), tBounds.Dy()
+
+	buf := new(bytes.Buffer)
+	fmt.Fprintf(buf, "// generated by go generate; DO NOT EDIT.\n\npackage %s\n\n", *pkg)
+	fmt.Fprintf(buf, "import (\n\"image\"\n\n\"golang.org/x/image/font/basicfont\"\n)\n\n")
+	fmt.Fprintf(buf, "// %s contains %d %d×%d glyphs in %d Pix bytes.\n",
+		*vr, len(glyphs), width, height, len(glyphs)*width*height)
+	fmt.Fprintf(buf, `var %s = basicfont.Face{
+		Advance: %d,
+		Width:   %d,
+		Height:  %d,
+		Ascent:  %d,
+		Descent: %d,
+		Left: %d,
+		Mask: &image.Alpha{
+			Stride: %d,
+			Rect: image.Rectangle{Max: image.Point{%d, %d*%d}},
+			Pix: []byte{
+				%s
+			},
+		},
+		Ranges: []basicfont.Range{
+			%s
+		},
+	}`, *vr, advance.Ceil(), width, face.Metrics().Height.Ceil(), -tBounds.Min.Y, +tBounds.Max.Y, tBounds.Min.X,
+		width, width, len(glyphs), height,
+		printPix(ranges, glyphs, tBounds), printRanges(ranges))
+
+	fmted, err := format.Source(buf.Bytes())
+	if err != nil {
+		log.Fatalf("format.Source: %v", err)
+	}
+	if err := ioutil.WriteFile(*vr+".go", fmted, 0644); err != nil {
+		log.Fatalf("ioutil.WriteFile: %v", err)
+	}
+}

vendor/github.com/golang/freetype/example/raster/main.go

@@ -0,0 +1,185 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// +build example
+//
+// This build tag means that "go install github.com/golang/freetype/..."
+// doesn't install this example program. Use "go run main.go" to run it or "go
+// install -tags=example" to install it.
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"log"
+	"os"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/math/fixed"
+)
+
+type node struct {
+	x, y, degree int
+}
+
+// These contours "outside" and "inside" are from the 'A' glyph from the Droid
+// Serif Regular font.
+
+var outside = []node{
+	node{414, 489, 1},
+	node{336, 274, 2},
+	node{327, 250, 0},
+	node{322, 226, 2},
+	node{317, 203, 0},
+	node{317, 186, 2},
+	node{317, 134, 0},
+	node{350, 110, 2},
+	node{384, 86, 0},
+	node{453, 86, 1},
+	node{500, 86, 1},
+	node{500, 0, 1},
+	node{0, 0, 1},
+	node{0, 86, 1},
+	node{39, 86, 2},
+	node{69, 86, 0},
+	node{90, 92, 2},
+	node{111, 99, 0},
+	node{128, 117, 2},
+	node{145, 135, 0},
+	node{160, 166, 2},
+	node{176, 197, 0},
+	node{195, 246, 1},
+	node{649, 1462, 1},
+	node{809, 1462, 1},
+	node{1272, 195, 2},
+	node{1284, 163, 0},
+	node{1296, 142, 2},
+	node{1309, 121, 0},
+	node{1326, 108, 2},
+	node{1343, 96, 0},
+	node{1365, 91, 2},
+	node{1387, 86, 0},
+	node{1417, 86, 1},
+	node{1444, 86, 1},
+	node{1444, 0, 1},
+	node{881, 0, 1},
+	node{881, 86, 1},
+	node{928, 86, 2},
+	node{1051, 86, 0},
+	node{1051, 184, 2},
+	node{1051, 201, 0},
+	node{1046, 219, 2},
+	node{1042, 237, 0},
+	node{1034, 260, 1},
+	node{952, 489, 1},
+	node{414, 489, -1},
+}
+
+var inside = []node{
+	node{686, 1274, 1},
+	node{453, 592, 1},
+	node{915, 592, 1},
+	node{686, 1274, -1},
+}
+
+func p(n node) fixed.Point26_6 {
+	x, y := 20+n.x/4, 380-n.y/4
+	return fixed.Point26_6{
+		X: fixed.Int26_6(x << 6),
+		Y: fixed.Int26_6(y << 6),
+	}
+}
+
+func contour(r *raster.Rasterizer, ns []node) {
+	if len(ns) == 0 {
+		return
+	}
+	i := 0
+	r.Start(p(ns[i]))
+	for {
+		switch ns[i].degree {
+		case -1:
+			// -1 signifies end-of-contour.
+			return
+		case 1:
+			i += 1
+			r.Add1(p(ns[i]))
+		case 2:
+			i += 2
+			r.Add2(p(ns[i-1]), p(ns[i]))
+		default:
+			panic("bad degree")
+		}
+	}
+}
+
+func showNodes(m *image.RGBA, ns []node) {
+	for _, n := range ns {
+		p := p(n)
+		x, y := int(p.X)/64, int(p.Y)/64
+		if !(image.Point{x, y}).In(m.Bounds()) {
+			continue
+		}
+		var c color.Color
+		switch n.degree {
+		case 0:
+			c = color.RGBA{0, 255, 255, 255}
+		case 1:
+			c = color.RGBA{255, 0, 0, 255}
+		case 2:
+			c = color.RGBA{255, 0, 0, 255}
+		}
+		if c != nil {
+			m.Set(x, y, c)
+		}
+	}
+}
+
+func main() {
+	// Rasterize the contours to a mask image.
+	const (
+		w = 400
+		h = 400
+	)
+	r := raster.NewRasterizer(w, h)
+	contour(r, outside)
+	contour(r, inside)
+	mask := image.NewAlpha(image.Rect(0, 0, w, h))
+	p := raster.NewAlphaSrcPainter(mask)
+	r.Rasterize(p)
+
+	// Draw the mask image (in gray) onto an RGBA image.
+	rgba := image.NewRGBA(image.Rect(0, 0, w, h))
+	gray := image.NewUniform(color.Alpha{0x1f})
+	draw.Draw(rgba, rgba.Bounds(), image.Black, image.ZP, draw.Src)
+	draw.DrawMask(rgba, rgba.Bounds(), gray, image.ZP, mask, image.ZP, draw.Over)
+	showNodes(rgba, outside)
+	showNodes(rgba, inside)
+
+	// Save that RGBA image to disk.
+	outFile, err := os.Create("out.png")
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	defer outFile.Close()
+	b := bufio.NewWriter(outFile)
+	err = png.Encode(b, rgba)
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	err = b.Flush()
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("Wrote out.png OK.")
+}

vendor/github.com/golang/freetype/example/round/main.go

@@ -0,0 +1,110 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// +build example
+//
+// This build tag means that "go install github.com/golang/freetype/..."
+// doesn't install this example program. Use "go run main.go" to run it or "go
+// install -tags=example" to install it.
+
+// This program visualizes the quadratic approximation to the circle, used to
+// implement round joins when stroking paths. The approximation is used in the
+// stroking code for arcs between 0 and 45 degrees, but is visualized here
+// between 0 and 90 degrees. The discrepancy between the approximation and the
+// true circle is clearly visible at angles above 65 degrees.
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"log"
+	"math"
+	"os"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/math/fixed"
+)
+
+// pDot returns the dot product p·q.
+func pDot(p, q fixed.Point26_6) fixed.Int52_12 {
+	px, py := int64(p.X), int64(p.Y)
+	qx, qy := int64(q.X), int64(q.Y)
+	return fixed.Int52_12(px*qx + py*qy)
+}
+
+func main() {
+	const (
+		n = 17
+		r = 64 * 80
+	)
+	s := fixed.Int26_6(r * math.Sqrt(2) / 2)
+	t := fixed.Int26_6(r * math.Tan(math.Pi/8))
+
+	m := image.NewRGBA(image.Rect(0, 0, 800, 600))
+	draw.Draw(m, m.Bounds(), image.NewUniform(color.RGBA{63, 63, 63, 255}), image.ZP, draw.Src)
+	mp := raster.NewRGBAPainter(m)
+	mp.SetColor(image.Black)
+	z := raster.NewRasterizer(800, 600)
+
+	for i := 0; i < n; i++ {
+		cx := fixed.Int26_6(6400 + 12800*(i%4))
+		cy := fixed.Int26_6(640 + 8000*(i/4))
+		c := fixed.Point26_6{X: cx, Y: cy}
+		theta := math.Pi * (0.5 + 0.5*float64(i)/(n-1))
+		dx := fixed.Int26_6(r * math.Cos(theta))
+		dy := fixed.Int26_6(r * math.Sin(theta))
+		d := fixed.Point26_6{X: dx, Y: dy}
+		// Draw a quarter-circle approximated by two quadratic segments,
+		// with each segment spanning 45 degrees.
+		z.Start(c)
+		z.Add1(c.Add(fixed.Point26_6{X: r, Y: 0}))
+		z.Add2(c.Add(fixed.Point26_6{X: r, Y: t}), c.Add(fixed.Point26_6{X: s, Y: s}))
+		z.Add2(c.Add(fixed.Point26_6{X: t, Y: r}), c.Add(fixed.Point26_6{X: 0, Y: r}))
+		// Add another quadratic segment whose angle ranges between 0 and 90
+		// degrees. For an explanation of the magic constants 128, 150, 181 and
+		// 256, read the comments in the freetype/raster package.
+		dot := 256 * pDot(d, fixed.Point26_6{X: 0, Y: r}) / (r * r)
+		multiple := fixed.Int26_6(150-(150-128)*(dot-181)/(256-181)) >> 2
+		z.Add2(c.Add(fixed.Point26_6{X: dx, Y: r + dy}.Mul(multiple)), c.Add(d))
+		// Close the curve.
+		z.Add1(c)
+	}
+	z.Rasterize(mp)
+
+	for i := 0; i < n; i++ {
+		cx := fixed.Int26_6(6400 + 12800*(i%4))
+		cy := fixed.Int26_6(640 + 8000*(i/4))
+		for j := 0; j < n; j++ {
+			theta := math.Pi * float64(j) / (n - 1)
+			dx := fixed.Int26_6(r * math.Cos(theta))
+			dy := fixed.Int26_6(r * math.Sin(theta))
+			m.Set(int((cx+dx)/64), int((cy+dy)/64), color.RGBA{255, 255, 0, 255})
+		}
+	}
+
+	// Save that RGBA image to disk.
+	outFile, err := os.Create("out.png")
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	defer outFile.Close()
+	b := bufio.NewWriter(outFile)
+	err = png.Encode(b, m)
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	err = b.Flush()
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("Wrote out.png OK.")
+}

vendor/github.com/golang/freetype/example/truetype/main.go

@@ -0,0 +1,89 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// +build example
+//
+// This build tag means that "go install github.com/golang/freetype/..."
+// doesn't install this example program. Use "go run main.go" to run it or "go
+// install -tags=example" to install it.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+var fontfile = flag.String("fontfile", "../../testdata/luxisr.ttf", "filename of the ttf font")
+
+func printBounds(b fixed.Rectangle26_6) {
+	fmt.Printf("Min.X:%d Min.Y:%d Max.X:%d Max.Y:%d\n", b.Min.X, b.Min.Y, b.Max.X, b.Max.Y)
+}
+
+func printGlyph(g *truetype.GlyphBuf) {
+	printBounds(g.Bounds)
+	fmt.Print("Points:\n---\n")
+	e := 0
+	for i, p := range g.Points {
+		fmt.Printf("%4d, %4d", p.X, p.Y)
+		if p.Flags&0x01 != 0 {
+			fmt.Print("  on\n")
+		} else {
+			fmt.Print("  off\n")
+		}
+		if i+1 == int(g.Ends[e]) {
+			fmt.Print("---\n")
+			e++
+		}
+	}
+}
+
+func main() {
+	flag.Parse()
+	fmt.Printf("Loading fontfile %q\n", *fontfile)
+	b, err := ioutil.ReadFile(*fontfile)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	f, err := truetype.Parse(b)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	fupe := fixed.Int26_6(f.FUnitsPerEm())
+	printBounds(f.Bounds(fupe))
+	fmt.Printf("FUnitsPerEm:%d\n\n", fupe)
+
+	c0, c1 := 'A', 'V'
+
+	i0 := f.Index(c0)
+	hm := f.HMetric(fupe, i0)
+	g := &truetype.GlyphBuf{}
+	err = g.Load(f, fupe, i0, font.HintingNone)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	fmt.Printf("'%c' glyph\n", c0)
+	fmt.Printf("AdvanceWidth:%d LeftSideBearing:%d\n", hm.AdvanceWidth, hm.LeftSideBearing)
+	printGlyph(g)
+	i1 := f.Index(c1)
+	fmt.Printf("\n'%c', '%c' Kern:%d\n", c0, c1, f.Kern(fupe, i0, i1))
+
+	fmt.Printf("\nThe numbers above are in FUnits.\n" +
+		"The numbers below are in 26.6 fixed point pixels, at 12pt and 72dpi.\n\n")
+	a := truetype.NewFace(f, &truetype.Options{
+		Size: 12,
+		DPI:  72,
+	})
+	fmt.Printf("%#v\n", a.Metrics())
+}

vendor/github.com/golang/freetype/freetype.go

@@ -0,0 +1,341 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// The freetype package provides a convenient API to draw text onto an image.
+// Use the freetype/raster and freetype/truetype packages for lower level
+// control over rasterization and TrueType parsing.
+package freetype // import "github.com/golang/freetype"
+
+import (
+	"errors"
+	"image"
+	"image/draw"
+
+	"github.com/golang/freetype/raster"
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+// These constants determine the size of the glyph cache. The cache is keyed
+// primarily by the glyph index modulo nGlyphs, and secondarily by sub-pixel
+// position for the mask image. Sub-pixel positions are quantized to
+// nXFractions possible values in both the x and y directions.
+const (
+	nGlyphs     = 256
+	nXFractions = 4
+	nYFractions = 1
+)
+
+// An entry in the glyph cache is keyed explicitly by the glyph index and
+// implicitly by the quantized x and y fractional offset. It maps to a mask
+// image and an offset.
+type cacheEntry struct {
+	valid        bool
+	glyph        truetype.Index
+	advanceWidth fixed.Int26_6
+	mask         *image.Alpha
+	offset       image.Point
+}
+
+// ParseFont just calls the Parse function from the freetype/truetype package.
+// It is provided here so that code that imports this package doesn't need
+// to also include the freetype/truetype package.
+func ParseFont(b []byte) (*truetype.Font, error) {
+	return truetype.Parse(b)
+}
+
+// Pt converts from a co-ordinate pair measured in pixels to a fixed.Point26_6
+// co-ordinate pair measured in fixed.Int26_6 units.
+func Pt(x, y int) fixed.Point26_6 {
+	return fixed.Point26_6{
+		X: fixed.Int26_6(x << 6),
+		Y: fixed.Int26_6(y << 6),
+	}
+}
+
+// A Context holds the state for drawing text in a given font and size.
+type Context struct {
+	r        *raster.Rasterizer
+	f        *truetype.Font
+	glyphBuf truetype.GlyphBuf
+	// clip is the clip rectangle for drawing.
+	clip image.Rectangle
+	// dst and src are the destination and source images for drawing.
+	dst draw.Image
+	src image.Image
+	// fontSize and dpi are used to calculate scale. scale is the number of
+	// 26.6 fixed point units in 1 em. hinting is the hinting policy.
+	fontSize, dpi float64
+	scale         fixed.Int26_6
+	hinting       font.Hinting
+	// cache is the glyph cache.
+	cache [nGlyphs * nXFractions * nYFractions]cacheEntry
+}
+
+// PointToFixed converts the given number of points (as in "a 12 point font")
+// into a 26.6 fixed point number of pixels.
+func (c *Context) PointToFixed(x float64) fixed.Int26_6 {
+	return fixed.Int26_6(x * float64(c.dpi) * (64.0 / 72.0))
+}
+
+// drawContour draws the given closed contour with the given offset.
+func (c *Context) drawContour(ps []truetype.Point, dx, dy fixed.Int26_6) {
+	if len(ps) == 0 {
+		return
+	}
+
+	// The low bit of each point's Flags value is whether the point is on the
+	// curve. Truetype fonts only have quadratic Bézier curves, not cubics.
+	// Thus, two consecutive off-curve points imply an on-curve point in the
+	// middle of those two.
+	//
+	// See http://chanae.walon.org/pub/ttf/ttf_glyphs.htm for more details.
+
+	// ps[0] is a truetype.Point measured in FUnits and positive Y going
+	// upwards. start is the same thing measured in fixed point units and
+	// positive Y going downwards, and offset by (dx, dy).
+	start := fixed.Point26_6{
+		X: dx + ps[0].X,
+		Y: dy - ps[0].Y,
+	}
+	others := []truetype.Point(nil)
+	if ps[0].Flags&0x01 != 0 {
+		others = ps[1:]
+	} else {
+		last := fixed.Point26_6{
+			X: dx + ps[len(ps)-1].X,
+			Y: dy - ps[len(ps)-1].Y,
+		}
+		if ps[len(ps)-1].Flags&0x01 != 0 {
+			start = last
+			others = ps[:len(ps)-1]
+		} else {
+			start = fixed.Point26_6{
+				X: (start.X + last.X) / 2,
+				Y: (start.Y + last.Y) / 2,
+			}
+			others = ps
+		}
+	}
+	c.r.Start(start)
+	q0, on0 := start, true
+	for _, p := range others {
+		q := fixed.Point26_6{
+			X: dx + p.X,
+			Y: dy - p.Y,
+		}
+		on := p.Flags&0x01 != 0
+		if on {
+			if on0 {
+				c.r.Add1(q)
+			} else {
+				c.r.Add2(q0, q)
+			}
+		} else {
+			if on0 {
+				// No-op.
+			} else {
+				mid := fixed.Point26_6{
+					X: (q0.X + q.X) / 2,
+					Y: (q0.Y + q.Y) / 2,
+				}
+				c.r.Add2(q0, mid)
+			}
+		}
+		q0, on0 = q, on
+	}
+	// Close the curve.
+	if on0 {
+		c.r.Add1(start)
+	} else {
+		c.r.Add2(q0, start)
+	}
+}
+
+// rasterize returns the advance width, glyph mask and integer-pixel offset
+// to render the given glyph at the given sub-pixel offsets.
+// The 26.6 fixed point arguments fx and fy must be in the range [0, 1).
+func (c *Context) rasterize(glyph truetype.Index, fx, fy fixed.Int26_6) (
+	fixed.Int26_6, *image.Alpha, image.Point, error) {
+
+	if err := c.glyphBuf.Load(c.f, c.scale, glyph, c.hinting); err != nil {
+		return 0, nil, image.Point{}, err
+	}
+	// Calculate the integer-pixel bounds for the glyph.
+	xmin := int(fx+c.glyphBuf.Bounds.Min.X) >> 6
+	ymin := int(fy-c.glyphBuf.Bounds.Max.Y) >> 6
+	xmax := int(fx+c.glyphBuf.Bounds.Max.X+0x3f) >> 6
+	ymax := int(fy-c.glyphBuf.Bounds.Min.Y+0x3f) >> 6
+	if xmin > xmax || ymin > ymax {
+		return 0, nil, image.Point{}, errors.New("freetype: negative sized glyph")
+	}
+	// A TrueType's glyph's nodes can have negative co-ordinates, but the
+	// rasterizer clips anything left of x=0 or above y=0. xmin and ymin are
+	// the pixel offsets, based on the font's FUnit metrics, that let a
+	// negative co-ordinate in TrueType space be non-negative in rasterizer
+	// space. xmin and ymin are typically <= 0.
+	fx -= fixed.Int26_6(xmin << 6)
+	fy -= fixed.Int26_6(ymin << 6)
+	// Rasterize the glyph's vectors.
+	c.r.Clear()
+	e0 := 0
+	for _, e1 := range c.glyphBuf.Ends {
+		c.drawContour(c.glyphBuf.Points[e0:e1], fx, fy)
+		e0 = e1
+	}
+	a := image.NewAlpha(image.Rect(0, 0, xmax-xmin, ymax-ymin))
+	c.r.Rasterize(raster.NewAlphaSrcPainter(a))
+	return c.glyphBuf.AdvanceWidth, a, image.Point{xmin, ymin}, nil
+}
+
+// glyph returns the advance width, glyph mask and integer-pixel offset to
+// render the given glyph at the given sub-pixel point. It is a cache for the
+// rasterize method. Unlike rasterize, p's co-ordinates do not have to be in
+// the range [0, 1).
+func (c *Context) glyph(glyph truetype.Index, p fixed.Point26_6) (
+	fixed.Int26_6, *image.Alpha, image.Point, error) {
+
+	// Split p.X and p.Y into their integer and fractional parts.
+	ix, fx := int(p.X>>6), p.X&0x3f
+	iy, fy := int(p.Y>>6), p.Y&0x3f
+	// Calculate the index t into the cache array.
+	tg := int(glyph) % nGlyphs
+	tx := int(fx) / (64 / nXFractions)
+	ty := int(fy) / (64 / nYFractions)
+	t := ((tg*nXFractions)+tx)*nYFractions + ty
+	// Check for a cache hit.
+	if e := c.cache[t]; e.valid && e.glyph == glyph {
+		return e.advanceWidth, e.mask, e.offset.Add(image.Point{ix, iy}), nil
+	}
+	// Rasterize the glyph and put the result into the cache.
+	advanceWidth, mask, offset, err := c.rasterize(glyph, fx, fy)
+	if err != nil {
+		return 0, nil, image.Point{}, err
+	}
+	c.cache[t] = cacheEntry{true, glyph, advanceWidth, mask, offset}
+	return advanceWidth, mask, offset.Add(image.Point{ix, iy}), nil
+}
+
+// DrawString draws s at p and returns p advanced by the text extent. The text
+// is placed so that the left edge of the em square of the first character of s
+// and the baseline intersect at p. The majority of the affected pixels will be
+// above and to the right of the point, but some may be below or to the left.
+// For example, drawing a string that starts with a 'J' in an italic font may
+// affect pixels below and left of the point.
+//
+// p is a fixed.Point26_6 and can therefore represent sub-pixel positions.
+func (c *Context) DrawString(s string, p fixed.Point26_6) (fixed.Point26_6, error) {
+	if c.f == nil {
+		return fixed.Point26_6{}, errors.New("freetype: DrawText called with a nil font")
+	}
+	prev, hasPrev := truetype.Index(0), false
+	for _, rune := range s {
+		index := c.f.Index(rune)
+		if hasPrev {
+			kern := c.f.Kern(c.scale, prev, index)
+			if c.hinting != font.HintingNone {
+				kern = (kern + 32) &^ 63
+			}
+			p.X += kern
+		}
+		advanceWidth, mask, offset, err := c.glyph(index, p)
+		if err != nil {
+			return fixed.Point26_6{}, err
+		}
+		p.X += advanceWidth
+		glyphRect := mask.Bounds().Add(offset)
+		dr := c.clip.Intersect(glyphRect)
+		if !dr.Empty() {
+			mp := image.Point{0, dr.Min.Y - glyphRect.Min.Y}
+			draw.DrawMask(c.dst, dr, c.src, image.ZP, mask, mp, draw.Over)
+		}
+		prev, hasPrev = index, true
+	}
+	return p, nil
+}
+
+// recalc recalculates scale and bounds values from the font size, screen
+// resolution and font metrics, and invalidates the glyph cache.
+func (c *Context) recalc() {
+	c.scale = fixed.Int26_6(c.fontSize * c.dpi * (64.0 / 72.0))
+	if c.f == nil {
+		c.r.SetBounds(0, 0)
+	} else {
+		// Set the rasterizer's bounds to be big enough to handle the largest glyph.
+		b := c.f.Bounds(c.scale)
+		xmin := +int(b.Min.X) >> 6
+		ymin := -int(b.Max.Y) >> 6
+		xmax := +int(b.Max.X+63) >> 6
+		ymax := -int(b.Min.Y-63) >> 6
+		c.r.SetBounds(xmax-xmin, ymax-ymin)
+	}
+	for i := range c.cache {
+		c.cache[i] = cacheEntry{}
+	}
+}
+
+// SetDPI sets the screen resolution in dots per inch.
+func (c *Context) SetDPI(dpi float64) {
+	if c.dpi == dpi {
+		return
+	}
+	c.dpi = dpi
+	c.recalc()
+}
+
+// SetFont sets the font used to draw text.
+func (c *Context) SetFont(f *truetype.Font) {
+	if c.f == f {
+		return
+	}
+	c.f = f
+	c.recalc()
+}
+
+// SetFontSize sets the font size in points (as in "a 12 point font").
+func (c *Context) SetFontSize(fontSize float64) {
+	if c.fontSize == fontSize {
+		return
+	}
+	c.fontSize = fontSize
+	c.recalc()
+}
+
+// SetHinting sets the hinting policy.
+func (c *Context) SetHinting(hinting font.Hinting) {
+	c.hinting = hinting
+	for i := range c.cache {
+		c.cache[i] = cacheEntry{}
+	}
+}
+
+// SetDst sets the destination image for draw operations.
+func (c *Context) SetDst(dst draw.Image) {
+	c.dst = dst
+}
+
+// SetSrc sets the source image for draw operations. This is typically an
+// image.Uniform.
+func (c *Context) SetSrc(src image.Image) {
+	c.src = src
+}
+
+// SetClip sets the clip rectangle for drawing.
+func (c *Context) SetClip(clip image.Rectangle) {
+	c.clip = clip
+}
+
+// TODO(nigeltao): implement Context.SetGamma.
+
+// NewContext creates a new Context.
+func NewContext() *Context {
+	return &Context{
+		r:        raster.NewRasterizer(0, 0),
+		fontSize: 12,
+		dpi:      72,
+		scale:    12 << 6,
+	}
+}

vendor/github.com/golang/freetype/freetype_test.go

@@ -0,0 +1,59 @@
+// Copyright 2012 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package freetype
+
+import (
+	"image"
+	"image/draw"
+	"io/ioutil"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+func BenchmarkDrawString(b *testing.B) {
+	data, err := ioutil.ReadFile("licenses/gpl.txt")
+	if err != nil {
+		b.Fatal(err)
+	}
+	lines := strings.Split(string(data), "\n")
+
+	data, err = ioutil.ReadFile("testdata/luxisr.ttf")
+	if err != nil {
+		b.Fatal(err)
+	}
+	f, err := ParseFont(data)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	dst := image.NewRGBA(image.Rect(0, 0, 800, 600))
+	draw.Draw(dst, dst.Bounds(), image.White, image.ZP, draw.Src)
+
+	c := NewContext()
+	c.SetDst(dst)
+	c.SetClip(dst.Bounds())
+	c.SetSrc(image.Black)
+	c.SetFont(f)
+
+	var ms runtime.MemStats
+	runtime.ReadMemStats(&ms)
+	mallocs := ms.Mallocs
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for j, line := range lines {
+			_, err := c.DrawString(line, Pt(0, (j*16)%600))
+			if err != nil {
+				b.Fatal(err)
+			}
+		}
+	}
+	b.StopTimer()
+	runtime.ReadMemStats(&ms)
+	mallocs = ms.Mallocs - mallocs
+	b.Logf("%d iterations, %d mallocs per iteration\n", b.N, int(mallocs)/b.N)
+}

vendor/github.com/golang/freetype/licenses/ftl.txt

@@ -0,0 +1,169 @@
+                    The FreeType Project LICENSE
+                    ----------------------------
+
+                            2006-Jan-27
+
+                    Copyright 1996-2002, 2006 by
+          David Turner, Robert Wilhelm, and Werner Lemberg
+
+
+
+Introduction
+============
+
+  The FreeType  Project is distributed in  several archive packages;
+  some of them may contain, in addition to the FreeType font engine,
+  various tools and  contributions which rely on, or  relate to, the
+  FreeType Project.
+
+  This  license applies  to all  files found  in such  packages, and
+  which do not  fall under their own explicit  license.  The license
+  affects  thus  the  FreeType   font  engine,  the  test  programs,
+  documentation and makefiles, at the very least.
+
+  This  license   was  inspired  by  the  BSD,   Artistic,  and  IJG
+  (Independent JPEG  Group) licenses, which  all encourage inclusion
+  and  use of  free  software in  commercial  and freeware  products
+  alike.  As a consequence, its main points are that:
+
+    o We don't promise that this software works. However, we will be
+      interested in any kind of bug reports. (`as is' distribution)
+
+    o You can  use this software for whatever you  want, in parts or
+      full form, without having to pay us. (`royalty-free' usage)
+
+    o You may not pretend that  you wrote this software.  If you use
+      it, or  only parts of it,  in a program,  you must acknowledge
+      somewhere  in  your  documentation  that  you  have  used  the
+      FreeType code. (`credits')
+
+  We  specifically  permit  and  encourage  the  inclusion  of  this
+  software, with  or without modifications,  in commercial products.
+  We  disclaim  all warranties  covering  The  FreeType Project  and
+  assume no liability related to The FreeType Project.
+
+
+  Finally,  many  people  asked  us  for  a  preferred  form  for  a
+  credit/disclaimer to use in compliance with this license.  We thus
+  encourage you to use the following text:
+
+   """
+    Portions of this software are copyright © <year> The FreeType
+    Project (www.freetype.org).  All rights reserved.
+   """
+
+  Please replace <year> with the value from the FreeType version you
+  actually use.
+
+
+Legal Terms
+===========
+
+0. Definitions
+--------------
+
+  Throughout this license,  the terms `package', `FreeType Project',
+  and  `FreeType  archive' refer  to  the  set  of files  originally
+  distributed  by the  authors  (David Turner,  Robert Wilhelm,  and
+  Werner Lemberg) as the `FreeType Project', be they named as alpha,
+  beta or final release.
+
+  `You' refers to  the licensee, or person using  the project, where
+  `using' is a generic term including compiling the project's source
+  code as  well as linking it  to form a  `program' or `executable'.
+  This  program is  referred to  as  `a program  using the  FreeType
+  engine'.
+
+  This  license applies  to all  files distributed  in  the original
+  FreeType  Project,   including  all  source   code,  binaries  and
+  documentation,  unless  otherwise  stated   in  the  file  in  its
+  original, unmodified form as  distributed in the original archive.
+  If you are  unsure whether or not a particular  file is covered by
+  this license, you must contact us to verify this.
+
+  The FreeType  Project is copyright (C) 1996-2000  by David Turner,
+  Robert Wilhelm, and Werner Lemberg.  All rights reserved except as
+  specified below.
+
+1. No Warranty
+--------------
+
+  THE FREETYPE PROJECT  IS PROVIDED `AS IS' WITHOUT  WARRANTY OF ANY
+  KIND, EITHER  EXPRESS OR IMPLIED,  INCLUDING, BUT NOT  LIMITED TO,
+  WARRANTIES  OF  MERCHANTABILITY   AND  FITNESS  FOR  A  PARTICULAR
+  PURPOSE.  IN NO EVENT WILL ANY OF THE AUTHORS OR COPYRIGHT HOLDERS
+  BE LIABLE  FOR ANY DAMAGES CAUSED  BY THE USE OR  THE INABILITY TO
+  USE, OF THE FREETYPE PROJECT.
+
+2. Redistribution
+-----------------
+
+  This  license  grants  a  worldwide, royalty-free,  perpetual  and
+  irrevocable right  and license to use,  execute, perform, compile,
+  display,  copy,   create  derivative  works   of,  distribute  and
+  sublicense the  FreeType Project (in  both source and  object code
+  forms)  and  derivative works  thereof  for  any  purpose; and  to
+  authorize others  to exercise  some or all  of the  rights granted
+  herein, subject to the following conditions:
+
+    o Redistribution of  source code  must retain this  license file
+      (`FTL.TXT') unaltered; any  additions, deletions or changes to
+      the original  files must be clearly  indicated in accompanying
+      documentation.   The  copyright   notices  of  the  unaltered,
+      original  files must  be  preserved in  all  copies of  source
+      files.
+
+    o Redistribution in binary form must provide a  disclaimer  that
+      states  that  the software is based in part of the work of the
+      FreeType Team,  in  the  distribution  documentation.  We also
+      encourage you to put an URL to the FreeType web page  in  your
+      documentation, though this isn't mandatory.
+
+  These conditions  apply to any  software derived from or  based on
+  the FreeType Project,  not just the unmodified files.   If you use
+  our work, you  must acknowledge us.  However, no  fee need be paid
+  to us.
+
+3. Advertising
+--------------
+
+  Neither the  FreeType authors and  contributors nor you  shall use
+  the name of the  other for commercial, advertising, or promotional
+  purposes without specific prior written permission.
+
+  We suggest,  but do not require, that  you use one or  more of the
+  following phrases to refer  to this software in your documentation
+  or advertising  materials: `FreeType Project',  `FreeType Engine',
+  `FreeType library', or `FreeType Distribution'.
+
+  As  you have  not signed  this license,  you are  not  required to
+  accept  it.   However,  as  the FreeType  Project  is  copyrighted
+  material, only  this license, or  another one contracted  with the
+  authors, grants you  the right to use, distribute,  and modify it.
+  Therefore,  by  using,  distributing,  or modifying  the  FreeType
+  Project, you indicate that you understand and accept all the terms
+  of this license.
+
+4. Contacts
+-----------
+
+  There are two mailing lists related to FreeType:
+
+    o freetype@nongnu.org
+
+      Discusses general use and applications of FreeType, as well as
+      future and  wanted additions to the  library and distribution.
+      If  you are looking  for support,  start in  this list  if you
+      haven't found anything to help you in the documentation.
+
+    o freetype-devel@nongnu.org
+
+      Discusses bugs,  as well  as engine internals,  design issues,
+      specific licenses, porting, etc.
+
+  Our home page can be found at
+
+    http://www.freetype.org
+
+
+--- end of FTL.TXT ---

vendor/github.com/golang/freetype/licenses/gpl.txt

@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+     51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year  name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.

vendor/github.com/golang/freetype/raster/geom.go

@@ -0,0 +1,245 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package raster
+
+import (
+	"fmt"
+	"math"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// maxAbs returns the maximum of abs(a) and abs(b).
+func maxAbs(a, b fixed.Int26_6) fixed.Int26_6 {
+	if a < 0 {
+		a = -a
+	}
+	if b < 0 {
+		b = -b
+	}
+	if a < b {
+		return b
+	}
+	return a
+}
+
+// pNeg returns the vector -p, or equivalently p rotated by 180 degrees.
+func pNeg(p fixed.Point26_6) fixed.Point26_6 {
+	return fixed.Point26_6{-p.X, -p.Y}
+}
+
+// pDot returns the dot product p·q.
+func pDot(p fixed.Point26_6, q fixed.Point26_6) fixed.Int52_12 {
+	px, py := int64(p.X), int64(p.Y)
+	qx, qy := int64(q.X), int64(q.Y)
+	return fixed.Int52_12(px*qx + py*qy)
+}
+
+// pLen returns the length of the vector p.
+func pLen(p fixed.Point26_6) fixed.Int26_6 {
+	// TODO(nigeltao): use fixed point math.
+	x := float64(p.X)
+	y := float64(p.Y)
+	return fixed.Int26_6(math.Sqrt(x*x + y*y))
+}
+
+// pNorm returns the vector p normalized to the given length, or zero if p is
+// degenerate.
+func pNorm(p fixed.Point26_6, length fixed.Int26_6) fixed.Point26_6 {
+	d := pLen(p)
+	if d == 0 {
+		return fixed.Point26_6{}
+	}
+	s, t := int64(length), int64(d)
+	x := int64(p.X) * s / t
+	y := int64(p.Y) * s / t
+	return fixed.Point26_6{fixed.Int26_6(x), fixed.Int26_6(y)}
+}
+
+// pRot45CW returns the vector p rotated clockwise by 45 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot45CW is {1/√2, 1/√2}.
+func pRot45CW(p fixed.Point26_6) fixed.Point26_6 {
+	// 181/256 is approximately 1/√2, or sin(π/4).
+	px, py := int64(p.X), int64(p.Y)
+	qx := (+px - py) * 181 / 256
+	qy := (+px + py) * 181 / 256
+	return fixed.Point26_6{fixed.Int26_6(qx), fixed.Int26_6(qy)}
+}
+
+// pRot90CW returns the vector p rotated clockwise by 90 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot90CW is {0, 1}.
+func pRot90CW(p fixed.Point26_6) fixed.Point26_6 {
+	return fixed.Point26_6{-p.Y, p.X}
+}
+
+// pRot135CW returns the vector p rotated clockwise by 135 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot135CW is {-1/√2, 1/√2}.
+func pRot135CW(p fixed.Point26_6) fixed.Point26_6 {
+	// 181/256 is approximately 1/√2, or sin(π/4).
+	px, py := int64(p.X), int64(p.Y)
+	qx := (-px - py) * 181 / 256
+	qy := (+px - py) * 181 / 256
+	return fixed.Point26_6{fixed.Int26_6(qx), fixed.Int26_6(qy)}
+}
+
+// pRot45CCW returns the vector p rotated counter-clockwise by 45 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot45CCW is {1/√2, -1/√2}.
+func pRot45CCW(p fixed.Point26_6) fixed.Point26_6 {
+	// 181/256 is approximately 1/√2, or sin(π/4).
+	px, py := int64(p.X), int64(p.Y)
+	qx := (+px + py) * 181 / 256
+	qy := (-px + py) * 181 / 256
+	return fixed.Point26_6{fixed.Int26_6(qx), fixed.Int26_6(qy)}
+}
+
+// pRot90CCW returns the vector p rotated counter-clockwise by 90 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot90CCW is {0, -1}.
+func pRot90CCW(p fixed.Point26_6) fixed.Point26_6 {
+	return fixed.Point26_6{p.Y, -p.X}
+}
+
+// pRot135CCW returns the vector p rotated counter-clockwise by 135 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot135CCW is {-1/√2, -1/√2}.
+func pRot135CCW(p fixed.Point26_6) fixed.Point26_6 {
+	// 181/256 is approximately 1/√2, or sin(π/4).
+	px, py := int64(p.X), int64(p.Y)
+	qx := (-px + py) * 181 / 256
+	qy := (-px - py) * 181 / 256
+	return fixed.Point26_6{fixed.Int26_6(qx), fixed.Int26_6(qy)}
+}
+
+// An Adder accumulates points on a curve.
+type Adder interface {
+	// Start starts a new curve at the given point.
+	Start(a fixed.Point26_6)
+	// Add1 adds a linear segment to the current curve.
+	Add1(b fixed.Point26_6)
+	// Add2 adds a quadratic segment to the current curve.
+	Add2(b, c fixed.Point26_6)
+	// Add3 adds a cubic segment to the current curve.
+	Add3(b, c, d fixed.Point26_6)
+}
+
+// A Path is a sequence of curves, and a curve is a start point followed by a
+// sequence of linear, quadratic or cubic segments.
+type Path []fixed.Int26_6
+
+// String returns a human-readable representation of a Path.
+func (p Path) String() string {
+	s := ""
+	for i := 0; i < len(p); {
+		if i != 0 {
+			s += " "
+		}
+		switch p[i] {
+		case 0:
+			s += "S0" + fmt.Sprint([]fixed.Int26_6(p[i+1:i+3]))
+			i += 4
+		case 1:
+			s += "A1" + fmt.Sprint([]fixed.Int26_6(p[i+1:i+3]))
+			i += 4
+		case 2:
+			s += "A2" + fmt.Sprint([]fixed.Int26_6(p[i+1:i+5]))
+			i += 6
+		case 3:
+			s += "A3" + fmt.Sprint([]fixed.Int26_6(p[i+1:i+7]))
+			i += 8
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+	return s
+}
+
+// Clear cancels any previous calls to p.Start or p.AddXxx.
+func (p *Path) Clear() {
+	*p = (*p)[:0]
+}
+
+// Start starts a new curve at the given point.
+func (p *Path) Start(a fixed.Point26_6) {
+	*p = append(*p, 0, a.X, a.Y, 0)
+}
+
+// Add1 adds a linear segment to the current curve.
+func (p *Path) Add1(b fixed.Point26_6) {
+	*p = append(*p, 1, b.X, b.Y, 1)
+}
+
+// Add2 adds a quadratic segment to the current curve.
+func (p *Path) Add2(b, c fixed.Point26_6) {
+	*p = append(*p, 2, b.X, b.Y, c.X, c.Y, 2)
+}
+
+// Add3 adds a cubic segment to the current curve.
+func (p *Path) Add3(b, c, d fixed.Point26_6) {
+	*p = append(*p, 3, b.X, b.Y, c.X, c.Y, d.X, d.Y, 3)
+}
+
+// AddPath adds the Path q to p.
+func (p *Path) AddPath(q Path) {
+	*p = append(*p, q...)
+}
+
+// AddStroke adds a stroked Path.
+func (p *Path) AddStroke(q Path, width fixed.Int26_6, cr Capper, jr Joiner) {
+	Stroke(p, q, width, cr, jr)
+}
+
+// firstPoint returns the first point in a non-empty Path.
+func (p Path) firstPoint() fixed.Point26_6 {
+	return fixed.Point26_6{p[1], p[2]}
+}
+
+// lastPoint returns the last point in a non-empty Path.
+func (p Path) lastPoint() fixed.Point26_6 {
+	return fixed.Point26_6{p[len(p)-3], p[len(p)-2]}
+}
+
+// addPathReversed adds q reversed to p.
+// For example, if q consists of a linear segment from A to B followed by a
+// quadratic segment from B to C to D, then the values of q looks like:
+// index: 01234567890123
+// value: 0AA01BB12CCDD2
+// So, when adding q backwards to p, we want to Add2(C, B) followed by Add1(A).
+func addPathReversed(p Adder, q Path) {
+	if len(q) == 0 {
+		return
+	}
+	i := len(q) - 1
+	for {
+		switch q[i] {
+		case 0:
+			return
+		case 1:
+			i -= 4
+			p.Add1(
+				fixed.Point26_6{q[i-2], q[i-1]},
+			)
+		case 2:
+			i -= 6
+			p.Add2(
+				fixed.Point26_6{q[i+2], q[i+3]},
+				fixed.Point26_6{q[i-2], q[i-1]},
+			)
+		case 3:
+			i -= 8
+			p.Add3(
+				fixed.Point26_6{q[i+4], q[i+5]},
+				fixed.Point26_6{q[i+2], q[i+3]},
+				fixed.Point26_6{q[i-2], q[i-1]},
+			)
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+}

vendor/github.com/golang/freetype/raster/paint.go

@@ -0,0 +1,287 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package raster
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"math"
+)
+
+// A Span is a horizontal segment of pixels with constant alpha. X0 is an
+// inclusive bound and X1 is exclusive, the same as for slices. A fully opaque
+// Span has Alpha == 0xffff.
+type Span struct {
+	Y, X0, X1 int
+	Alpha     uint32
+}
+
+// A Painter knows how to paint a batch of Spans. Rasterization may involve
+// Painting multiple batches, and done will be true for the final batch. The
+// Spans' Y values are monotonically increasing during a rasterization. Paint
+// may use all of ss as scratch space during the call.
+type Painter interface {
+	Paint(ss []Span, done bool)
+}
+
+// The PainterFunc type adapts an ordinary function to the Painter interface.
+type PainterFunc func(ss []Span, done bool)
+
+// Paint just delegates the call to f.
+func (f PainterFunc) Paint(ss []Span, done bool) { f(ss, done) }
+
+// An AlphaOverPainter is a Painter that paints Spans onto a *image.Alpha using
+// the Over Porter-Duff composition operator.
+type AlphaOverPainter struct {
+	Image *image.Alpha
+}
+
+// Paint satisfies the Painter interface.
+func (r AlphaOverPainter) Paint(ss []Span, done bool) {
+	b := r.Image.Bounds()
+	for _, s := range ss {
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		base := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride - r.Image.Rect.Min.X
+		p := r.Image.Pix[base+s.X0 : base+s.X1]
+		a := int(s.Alpha >> 8)
+		for i, c := range p {
+			v := int(c)
+			p[i] = uint8((v*255 + (255-v)*a) / 255)
+		}
+	}
+}
+
+// NewAlphaOverPainter creates a new AlphaOverPainter for the given image.
+func NewAlphaOverPainter(m *image.Alpha) AlphaOverPainter {
+	return AlphaOverPainter{m}
+}
+
+// An AlphaSrcPainter is a Painter that paints Spans onto a *image.Alpha using
+// the Src Porter-Duff composition operator.
+type AlphaSrcPainter struct {
+	Image *image.Alpha
+}
+
+// Paint satisfies the Painter interface.
+func (r AlphaSrcPainter) Paint(ss []Span, done bool) {
+	b := r.Image.Bounds()
+	for _, s := range ss {
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		base := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride - r.Image.Rect.Min.X
+		p := r.Image.Pix[base+s.X0 : base+s.X1]
+		color := uint8(s.Alpha >> 8)
+		for i := range p {
+			p[i] = color
+		}
+	}
+}
+
+// NewAlphaSrcPainter creates a new AlphaSrcPainter for the given image.
+func NewAlphaSrcPainter(m *image.Alpha) AlphaSrcPainter {
+	return AlphaSrcPainter{m}
+}
+
+// An RGBAPainter is a Painter that paints Spans onto a *image.RGBA.
+type RGBAPainter struct {
+	// Image is the image to compose onto.
+	Image *image.RGBA
+	// Op is the Porter-Duff composition operator.
+	Op draw.Op
+	// cr, cg, cb and ca are the 16-bit color to paint the spans.
+	cr, cg, cb, ca uint32
+}
+
+// Paint satisfies the Painter interface.
+func (r *RGBAPainter) Paint(ss []Span, done bool) {
+	b := r.Image.Bounds()
+	for _, s := range ss {
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		// This code mimics drawGlyphOver in $GOROOT/src/image/draw/draw.go.
+		ma := s.Alpha
+		const m = 1<<16 - 1
+		i0 := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride + (s.X0-r.Image.Rect.Min.X)*4
+		i1 := i0 + (s.X1-s.X0)*4
+		if r.Op == draw.Over {
+			for i := i0; i < i1; i += 4 {
+				dr := uint32(r.Image.Pix[i+0])
+				dg := uint32(r.Image.Pix[i+1])
+				db := uint32(r.Image.Pix[i+2])
+				da := uint32(r.Image.Pix[i+3])
+				a := (m - (r.ca * ma / m)) * 0x101
+				r.Image.Pix[i+0] = uint8((dr*a + r.cr*ma) / m >> 8)
+				r.Image.Pix[i+1] = uint8((dg*a + r.cg*ma) / m >> 8)
+				r.Image.Pix[i+2] = uint8((db*a + r.cb*ma) / m >> 8)
+				r.Image.Pix[i+3] = uint8((da*a + r.ca*ma) / m >> 8)
+			}
+		} else {
+			for i := i0; i < i1; i += 4 {
+				r.Image.Pix[i+0] = uint8(r.cr * ma / m >> 8)
+				r.Image.Pix[i+1] = uint8(r.cg * ma / m >> 8)
+				r.Image.Pix[i+2] = uint8(r.cb * ma / m >> 8)
+				r.Image.Pix[i+3] = uint8(r.ca * ma / m >> 8)
+			}
+		}
+	}
+}
+
+// SetColor sets the color to paint the spans.
+func (r *RGBAPainter) SetColor(c color.Color) {
+	r.cr, r.cg, r.cb, r.ca = c.RGBA()
+}
+
+// NewRGBAPainter creates a new RGBAPainter for the given image.
+func NewRGBAPainter(m *image.RGBA) *RGBAPainter {
+	return &RGBAPainter{Image: m}
+}
+
+// A MonochromePainter wraps another Painter, quantizing each Span's alpha to
+// be either fully opaque or fully transparent.
+type MonochromePainter struct {
+	Painter   Painter
+	y, x0, x1 int
+}
+
+// Paint delegates to the wrapped Painter after quantizing each Span's alpha
+// value and merging adjacent fully opaque Spans.
+func (m *MonochromePainter) Paint(ss []Span, done bool) {
+	// We compact the ss slice, discarding any Spans whose alpha quantizes to zero.
+	j := 0
+	for _, s := range ss {
+		if s.Alpha >= 0x8000 {
+			if m.y == s.Y && m.x1 == s.X0 {
+				m.x1 = s.X1
+			} else {
+				ss[j] = Span{m.y, m.x0, m.x1, 1<<16 - 1}
+				j++
+				m.y, m.x0, m.x1 = s.Y, s.X0, s.X1
+			}
+		}
+	}
+	if done {
+		// Flush the accumulated Span.
+		finalSpan := Span{m.y, m.x0, m.x1, 1<<16 - 1}
+		if j < len(ss) {
+			ss[j] = finalSpan
+			j++
+			m.Painter.Paint(ss[:j], true)
+		} else if j == len(ss) {
+			m.Painter.Paint(ss, false)
+			if cap(ss) > 0 {
+				ss = ss[:1]
+			} else {
+				ss = make([]Span, 1)
+			}
+			ss[0] = finalSpan
+			m.Painter.Paint(ss, true)
+		} else {
+			panic("unreachable")
+		}
+		// Reset the accumulator, so that this Painter can be re-used.
+		m.y, m.x0, m.x1 = 0, 0, 0
+	} else {
+		m.Painter.Paint(ss[:j], false)
+	}
+}
+
+// NewMonochromePainter creates a new MonochromePainter that wraps the given
+// Painter.
+func NewMonochromePainter(p Painter) *MonochromePainter {
+	return &MonochromePainter{Painter: p}
+}
+
+// A GammaCorrectionPainter wraps another Painter, performing gamma-correction
+// on each Span's alpha value.
+type GammaCorrectionPainter struct {
+	// Painter is the wrapped Painter.
+	Painter Painter
+	// a is the precomputed alpha values for linear interpolation, with fully
+	// opaque == 0xffff.
+	a [256]uint16
+	// gammaIsOne is whether gamma correction is a no-op.
+	gammaIsOne bool
+}
+
+// Paint delegates to the wrapped Painter after performing gamma-correction on
+// each Span.
+func (g *GammaCorrectionPainter) Paint(ss []Span, done bool) {
+	if !g.gammaIsOne {
+		const n = 0x101
+		for i, s := range ss {
+			if s.Alpha == 0 || s.Alpha == 0xffff {
+				continue
+			}
+			p, q := s.Alpha/n, s.Alpha%n
+			// The resultant alpha is a linear interpolation of g.a[p] and g.a[p+1].
+			a := uint32(g.a[p])*(n-q) + uint32(g.a[p+1])*q
+			ss[i].Alpha = (a + n/2) / n
+		}
+	}
+	g.Painter.Paint(ss, done)
+}
+
+// SetGamma sets the gamma value.
+func (g *GammaCorrectionPainter) SetGamma(gamma float64) {
+	g.gammaIsOne = gamma == 1
+	if g.gammaIsOne {
+		return
+	}
+	for i := 0; i < 256; i++ {
+		a := float64(i) / 0xff
+		a = math.Pow(a, gamma)
+		g.a[i] = uint16(0xffff * a)
+	}
+}
+
+// NewGammaCorrectionPainter creates a new GammaCorrectionPainter that wraps
+// the given Painter.
+func NewGammaCorrectionPainter(p Painter, gamma float64) *GammaCorrectionPainter {
+	g := &GammaCorrectionPainter{Painter: p}
+	g.SetGamma(gamma)
+	return g
+}

vendor/github.com/golang/freetype/raster/raster.go

@@ -0,0 +1,601 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// Package raster provides an anti-aliasing 2-D rasterizer.
+//
+// It is part of the larger Freetype suite of font-related packages, but the
+// raster package is not specific to font rasterization, and can be used
+// standalone without any other Freetype package.
+//
+// Rasterization is done by the same area/coverage accumulation algorithm as
+// the Freetype "smooth" module, and the Anti-Grain Geometry library. A
+// description of the area/coverage algorithm is at
+// http://projects.tuxee.net/cl-vectors/section-the-cl-aa-algorithm
+package raster // import "github.com/golang/freetype/raster"
+
+import (
+	"strconv"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// A cell is part of a linked list (for a given yi co-ordinate) of accumulated
+// area/coverage for the pixel at (xi, yi).
+type cell struct {
+	xi          int
+	area, cover int
+	next        int
+}
+
+type Rasterizer struct {
+	// If false, the default behavior is to use the even-odd winding fill
+	// rule during Rasterize.
+	UseNonZeroWinding bool
+	// An offset (in pixels) to the painted spans.
+	Dx, Dy int
+
+	// The width of the Rasterizer. The height is implicit in len(cellIndex).
+	width int
+	// splitScaleN is the scaling factor used to determine how many times
+	// to decompose a quadratic or cubic segment into a linear approximation.
+	splitScale2, splitScale3 int
+
+	// The current pen position.
+	a fixed.Point26_6
+	// The current cell and its area/coverage being accumulated.
+	xi, yi      int
+	area, cover int
+
+	// Saved cells.
+	cell []cell
+	// Linked list of cells, one per row.
+	cellIndex []int
+	// Buffers.
+	cellBuf      [256]cell
+	cellIndexBuf [64]int
+	spanBuf      [64]Span
+}
+
+// findCell returns the index in r.cell for the cell corresponding to
+// (r.xi, r.yi). The cell is created if necessary.
+func (r *Rasterizer) findCell() int {
+	if r.yi < 0 || r.yi >= len(r.cellIndex) {
+		return -1
+	}
+	xi := r.xi
+	if xi < 0 {
+		xi = -1
+	} else if xi > r.width {
+		xi = r.width
+	}
+	i, prev := r.cellIndex[r.yi], -1
+	for i != -1 && r.cell[i].xi <= xi {
+		if r.cell[i].xi == xi {
+			return i
+		}
+		i, prev = r.cell[i].next, i
+	}
+	c := len(r.cell)
+	if c == cap(r.cell) {
+		buf := make([]cell, c, 4*c)
+		copy(buf, r.cell)
+		r.cell = buf[0 : c+1]
+	} else {
+		r.cell = r.cell[0 : c+1]
+	}
+	r.cell[c] = cell{xi, 0, 0, i}
+	if prev == -1 {
+		r.cellIndex[r.yi] = c
+	} else {
+		r.cell[prev].next = c
+	}
+	return c
+}
+
+// saveCell saves any accumulated r.area/r.cover for (r.xi, r.yi).
+func (r *Rasterizer) saveCell() {
+	if r.area != 0 || r.cover != 0 {
+		i := r.findCell()
+		if i != -1 {
+			r.cell[i].area += r.area
+			r.cell[i].cover += r.cover
+		}
+		r.area = 0
+		r.cover = 0
+	}
+}
+
+// setCell sets the (xi, yi) cell that r is accumulating area/coverage for.
+func (r *Rasterizer) setCell(xi, yi int) {
+	if r.xi != xi || r.yi != yi {
+		r.saveCell()
+		r.xi, r.yi = xi, yi
+	}
+}
+
+// scan accumulates area/coverage for the yi'th scanline, going from
+// x0 to x1 in the horizontal direction (in 26.6 fixed point co-ordinates)
+// and from y0f to y1f fractional vertical units within that scanline.
+func (r *Rasterizer) scan(yi int, x0, y0f, x1, y1f fixed.Int26_6) {
+	// Break the 26.6 fixed point X co-ordinates into integral and fractional parts.
+	x0i := int(x0) / 64
+	x0f := x0 - fixed.Int26_6(64*x0i)
+	x1i := int(x1) / 64
+	x1f := x1 - fixed.Int26_6(64*x1i)
+
+	// A perfectly horizontal scan.
+	if y0f == y1f {
+		r.setCell(x1i, yi)
+		return
+	}
+	dx, dy := x1-x0, y1f-y0f
+	// A single cell scan.
+	if x0i == x1i {
+		r.area += int((x0f + x1f) * dy)
+		r.cover += int(dy)
+		return
+	}
+	// There are at least two cells. Apart from the first and last cells,
+	// all intermediate cells go through the full width of the cell,
+	// or 64 units in 26.6 fixed point format.
+	var (
+		p, q, edge0, edge1 fixed.Int26_6
+		xiDelta            int
+	)
+	if dx > 0 {
+		p, q = (64-x0f)*dy, dx
+		edge0, edge1, xiDelta = 0, 64, 1
+	} else {
+		p, q = x0f*dy, -dx
+		edge0, edge1, xiDelta = 64, 0, -1
+	}
+	yDelta, yRem := p/q, p%q
+	if yRem < 0 {
+		yDelta -= 1
+		yRem += q
+	}
+	// Do the first cell.
+	xi, y := x0i, y0f
+	r.area += int((x0f + edge1) * yDelta)
+	r.cover += int(yDelta)
+	xi, y = xi+xiDelta, y+yDelta
+	r.setCell(xi, yi)
+	if xi != x1i {
+		// Do all the intermediate cells.
+		p = 64 * (y1f - y + yDelta)
+		fullDelta, fullRem := p/q, p%q
+		if fullRem < 0 {
+			fullDelta -= 1
+			fullRem += q
+		}
+		yRem -= q
+		for xi != x1i {
+			yDelta = fullDelta
+			yRem += fullRem
+			if yRem >= 0 {
+				yDelta += 1
+				yRem -= q
+			}
+			r.area += int(64 * yDelta)
+			r.cover += int(yDelta)
+			xi, y = xi+xiDelta, y+yDelta
+			r.setCell(xi, yi)
+		}
+	}
+	// Do the last cell.
+	yDelta = y1f - y
+	r.area += int((edge0 + x1f) * yDelta)
+	r.cover += int(yDelta)
+}
+
+// Start starts a new curve at the given point.
+func (r *Rasterizer) Start(a fixed.Point26_6) {
+	r.setCell(int(a.X/64), int(a.Y/64))
+	r.a = a
+}
+
+// Add1 adds a linear segment to the current curve.
+func (r *Rasterizer) Add1(b fixed.Point26_6) {
+	x0, y0 := r.a.X, r.a.Y
+	x1, y1 := b.X, b.Y
+	dx, dy := x1-x0, y1-y0
+	// Break the 26.6 fixed point Y co-ordinates into integral and fractional
+	// parts.
+	y0i := int(y0) / 64
+	y0f := y0 - fixed.Int26_6(64*y0i)
+	y1i := int(y1) / 64
+	y1f := y1 - fixed.Int26_6(64*y1i)
+
+	if y0i == y1i {
+		// There is only one scanline.
+		r.scan(y0i, x0, y0f, x1, y1f)
+
+	} else if dx == 0 {
+		// This is a vertical line segment. We avoid calling r.scan and instead
+		// manipulate r.area and r.cover directly.
+		var (
+			edge0, edge1 fixed.Int26_6
+			yiDelta      int
+		)
+		if dy > 0 {
+			edge0, edge1, yiDelta = 0, 64, 1
+		} else {
+			edge0, edge1, yiDelta = 64, 0, -1
+		}
+		x0i, yi := int(x0)/64, y0i
+		x0fTimes2 := (int(x0) - (64 * x0i)) * 2
+		// Do the first pixel.
+		dcover := int(edge1 - y0f)
+		darea := int(x0fTimes2 * dcover)
+		r.area += darea
+		r.cover += dcover
+		yi += yiDelta
+		r.setCell(x0i, yi)
+		// Do all the intermediate pixels.
+		dcover = int(edge1 - edge0)
+		darea = int(x0fTimes2 * dcover)
+		for yi != y1i {
+			r.area += darea
+			r.cover += dcover
+			yi += yiDelta
+			r.setCell(x0i, yi)
+		}
+		// Do the last pixel.
+		dcover = int(y1f - edge0)
+		darea = int(x0fTimes2 * dcover)
+		r.area += darea
+		r.cover += dcover
+
+	} else {
+		// There are at least two scanlines. Apart from the first and last
+		// scanlines, all intermediate scanlines go through the full height of
+		// the row, or 64 units in 26.6 fixed point format.
+		var (
+			p, q, edge0, edge1 fixed.Int26_6
+			yiDelta            int
+		)
+		if dy > 0 {
+			p, q = (64-y0f)*dx, dy
+			edge0, edge1, yiDelta = 0, 64, 1
+		} else {
+			p, q = y0f*dx, -dy
+			edge0, edge1, yiDelta = 64, 0, -1
+		}
+		xDelta, xRem := p/q, p%q
+		if xRem < 0 {
+			xDelta -= 1
+			xRem += q
+		}
+		// Do the first scanline.
+		x, yi := x0, y0i
+		r.scan(yi, x, y0f, x+xDelta, edge1)
+		x, yi = x+xDelta, yi+yiDelta
+		r.setCell(int(x)/64, yi)
+		if yi != y1i {
+			// Do all the intermediate scanlines.
+			p = 64 * dx
+			fullDelta, fullRem := p/q, p%q
+			if fullRem < 0 {
+				fullDelta -= 1
+				fullRem += q
+			}
+			xRem -= q
+			for yi != y1i {
+				xDelta = fullDelta
+				xRem += fullRem
+				if xRem >= 0 {
+					xDelta += 1
+					xRem -= q
+				}
+				r.scan(yi, x, edge0, x+xDelta, edge1)
+				x, yi = x+xDelta, yi+yiDelta
+				r.setCell(int(x)/64, yi)
+			}
+		}
+		// Do the last scanline.
+		r.scan(yi, x, edge0, x1, y1f)
+	}
+	// The next lineTo starts from b.
+	r.a = b
+}
+
+// Add2 adds a quadratic segment to the current curve.
+func (r *Rasterizer) Add2(b, c fixed.Point26_6) {
+	// Calculate nSplit (the number of recursive decompositions) based on how
+	// 'curvy' it is. Specifically, how much the middle point b deviates from
+	// (a+c)/2.
+	dev := maxAbs(r.a.X-2*b.X+c.X, r.a.Y-2*b.Y+c.Y) / fixed.Int26_6(r.splitScale2)
+	nsplit := 0
+	for dev > 0 {
+		dev /= 4
+		nsplit++
+	}
+	// dev is 32-bit, and nsplit++ every time we shift off 2 bits, so maxNsplit
+	// is 16.
+	const maxNsplit = 16
+	if nsplit > maxNsplit {
+		panic("freetype/raster: Add2 nsplit too large: " + strconv.Itoa(nsplit))
+	}
+	// Recursively decompose the curve nSplit levels deep.
+	var (
+		pStack [2*maxNsplit + 3]fixed.Point26_6
+		sStack [maxNsplit + 1]int
+		i      int
+	)
+	sStack[0] = nsplit
+	pStack[0] = c
+	pStack[1] = b
+	pStack[2] = r.a
+	for i >= 0 {
+		s := sStack[i]
+		p := pStack[2*i:]
+		if s > 0 {
+			// Split the quadratic curve p[:3] into an equivalent set of two
+			// shorter curves: p[:3] and p[2:5]. The new p[4] is the old p[2],
+			// and p[0] is unchanged.
+			mx := p[1].X
+			p[4].X = p[2].X
+			p[3].X = (p[4].X + mx) / 2
+			p[1].X = (p[0].X + mx) / 2
+			p[2].X = (p[1].X + p[3].X) / 2
+			my := p[1].Y
+			p[4].Y = p[2].Y
+			p[3].Y = (p[4].Y + my) / 2
+			p[1].Y = (p[0].Y + my) / 2
+			p[2].Y = (p[1].Y + p[3].Y) / 2
+			// The two shorter curves have one less split to do.
+			sStack[i] = s - 1
+			sStack[i+1] = s - 1
+			i++
+		} else {
+			// Replace the level-0 quadratic with a two-linear-piece
+			// approximation.
+			midx := (p[0].X + 2*p[1].X + p[2].X) / 4
+			midy := (p[0].Y + 2*p[1].Y + p[2].Y) / 4
+			r.Add1(fixed.Point26_6{midx, midy})
+			r.Add1(p[0])
+			i--
+		}
+	}
+}
+
+// Add3 adds a cubic segment to the current curve.
+func (r *Rasterizer) Add3(b, c, d fixed.Point26_6) {
+	// Calculate nSplit (the number of recursive decompositions) based on how
+	// 'curvy' it is.
+	dev2 := maxAbs(r.a.X-3*(b.X+c.X)+d.X, r.a.Y-3*(b.Y+c.Y)+d.Y) / fixed.Int26_6(r.splitScale2)
+	dev3 := maxAbs(r.a.X-2*b.X+d.X, r.a.Y-2*b.Y+d.Y) / fixed.Int26_6(r.splitScale3)
+	nsplit := 0
+	for dev2 > 0 || dev3 > 0 {
+		dev2 /= 8
+		dev3 /= 4
+		nsplit++
+	}
+	// devN is 32-bit, and nsplit++ every time we shift off 2 bits, so
+	// maxNsplit is 16.
+	const maxNsplit = 16
+	if nsplit > maxNsplit {
+		panic("freetype/raster: Add3 nsplit too large: " + strconv.Itoa(nsplit))
+	}
+	// Recursively decompose the curve nSplit levels deep.
+	var (
+		pStack [3*maxNsplit + 4]fixed.Point26_6
+		sStack [maxNsplit + 1]int
+		i      int
+	)
+	sStack[0] = nsplit
+	pStack[0] = d
+	pStack[1] = c
+	pStack[2] = b
+	pStack[3] = r.a
+	for i >= 0 {
+		s := sStack[i]
+		p := pStack[3*i:]
+		if s > 0 {
+			// Split the cubic curve p[:4] into an equivalent set of two
+			// shorter curves: p[:4] and p[3:7]. The new p[6] is the old p[3],
+			// and p[0] is unchanged.
+			m01x := (p[0].X + p[1].X) / 2
+			m12x := (p[1].X + p[2].X) / 2
+			m23x := (p[2].X + p[3].X) / 2
+			p[6].X = p[3].X
+			p[5].X = m23x
+			p[1].X = m01x
+			p[2].X = (m01x + m12x) / 2
+			p[4].X = (m12x + m23x) / 2
+			p[3].X = (p[2].X + p[4].X) / 2
+			m01y := (p[0].Y + p[1].Y) / 2
+			m12y := (p[1].Y + p[2].Y) / 2
+			m23y := (p[2].Y + p[3].Y) / 2
+			p[6].Y = p[3].Y
+			p[5].Y = m23y
+			p[1].Y = m01y
+			p[2].Y = (m01y + m12y) / 2
+			p[4].Y = (m12y + m23y) / 2
+			p[3].Y = (p[2].Y + p[4].Y) / 2
+			// The two shorter curves have one less split to do.
+			sStack[i] = s - 1
+			sStack[i+1] = s - 1
+			i++
+		} else {
+			// Replace the level-0 cubic with a two-linear-piece approximation.
+			midx := (p[0].X + 3*(p[1].X+p[2].X) + p[3].X) / 8
+			midy := (p[0].Y + 3*(p[1].Y+p[2].Y) + p[3].Y) / 8
+			r.Add1(fixed.Point26_6{midx, midy})
+			r.Add1(p[0])
+			i--
+		}
+	}
+}
+
+// AddPath adds the given Path.
+func (r *Rasterizer) AddPath(p Path) {
+	for i := 0; i < len(p); {
+		switch p[i] {
+		case 0:
+			r.Start(
+				fixed.Point26_6{p[i+1], p[i+2]},
+			)
+			i += 4
+		case 1:
+			r.Add1(
+				fixed.Point26_6{p[i+1], p[i+2]},
+			)
+			i += 4
+		case 2:
+			r.Add2(
+				fixed.Point26_6{p[i+1], p[i+2]},
+				fixed.Point26_6{p[i+3], p[i+4]},
+			)
+			i += 6
+		case 3:
+			r.Add3(
+				fixed.Point26_6{p[i+1], p[i+2]},
+				fixed.Point26_6{p[i+3], p[i+4]},
+				fixed.Point26_6{p[i+5], p[i+6]},
+			)
+			i += 8
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+}
+
+// AddStroke adds a stroked Path.
+func (r *Rasterizer) AddStroke(q Path, width fixed.Int26_6, cr Capper, jr Joiner) {
+	Stroke(r, q, width, cr, jr)
+}
+
+// areaToAlpha converts an area value to a uint32 alpha value. A completely
+// filled pixel corresponds to an area of 64*64*2, and an alpha of 0xffff. The
+// conversion of area values greater than this depends on the winding rule:
+// even-odd or non-zero.
+func (r *Rasterizer) areaToAlpha(area int) uint32 {
+	// The C Freetype implementation (version 2.3.12) does "alpha := area>>1"
+	// without the +1. Round-to-nearest gives a more symmetric result than
+	// round-down. The C implementation also returns 8-bit alpha, not 16-bit
+	// alpha.
+	a := (area + 1) >> 1
+	if a < 0 {
+		a = -a
+	}
+	alpha := uint32(a)
+	if r.UseNonZeroWinding {
+		if alpha > 0x0fff {
+			alpha = 0x0fff
+		}
+	} else {
+		alpha &= 0x1fff
+		if alpha > 0x1000 {
+			alpha = 0x2000 - alpha
+		} else if alpha == 0x1000 {
+			alpha = 0x0fff
+		}
+	}
+	// alpha is now in the range [0x0000, 0x0fff]. Convert that 12-bit alpha to
+	// 16-bit alpha.
+	return alpha<<4 | alpha>>8
+}
+
+// Rasterize converts r's accumulated curves into Spans for p. The Spans passed
+// to p are non-overlapping, and sorted by Y and then X. They all have non-zero
+// width (and 0 <= X0 < X1 <= r.width) and non-zero A, except for the final
+// Span, which has Y, X0, X1 and A all equal to zero.
+func (r *Rasterizer) Rasterize(p Painter) {
+	r.saveCell()
+	s := 0
+	for yi := 0; yi < len(r.cellIndex); yi++ {
+		xi, cover := 0, 0
+		for c := r.cellIndex[yi]; c != -1; c = r.cell[c].next {
+			if cover != 0 && r.cell[c].xi > xi {
+				alpha := r.areaToAlpha(cover * 64 * 2)
+				if alpha != 0 {
+					xi0, xi1 := xi, r.cell[c].xi
+					if xi0 < 0 {
+						xi0 = 0
+					}
+					if xi1 >= r.width {
+						xi1 = r.width
+					}
+					if xi0 < xi1 {
+						r.spanBuf[s] = Span{yi + r.Dy, xi0 + r.Dx, xi1 + r.Dx, alpha}
+						s++
+					}
+				}
+			}
+			cover += r.cell[c].cover
+			alpha := r.areaToAlpha(cover*64*2 - r.cell[c].area)
+			xi = r.cell[c].xi + 1
+			if alpha != 0 {
+				xi0, xi1 := r.cell[c].xi, xi
+				if xi0 < 0 {
+					xi0 = 0
+				}
+				if xi1 >= r.width {
+					xi1 = r.width
+				}
+				if xi0 < xi1 {
+					r.spanBuf[s] = Span{yi + r.Dy, xi0 + r.Dx, xi1 + r.Dx, alpha}
+					s++
+				}
+			}
+			if s > len(r.spanBuf)-2 {
+				p.Paint(r.spanBuf[:s], false)
+				s = 0
+			}
+		}
+	}
+	p.Paint(r.spanBuf[:s], true)
+}
+
+// Clear cancels any previous calls to r.Start or r.AddXxx.
+func (r *Rasterizer) Clear() {
+	r.a = fixed.Point26_6{}
+	r.xi = 0
+	r.yi = 0
+	r.area = 0
+	r.cover = 0
+	r.cell = r.cell[:0]
+	for i := 0; i < len(r.cellIndex); i++ {
+		r.cellIndex[i] = -1
+	}
+}
+
+// SetBounds sets the maximum width and height of the rasterized image and
+// calls Clear. The width and height are in pixels, not fixed.Int26_6 units.
+func (r *Rasterizer) SetBounds(width, height int) {
+	if width < 0 {
+		width = 0
+	}
+	if height < 0 {
+		height = 0
+	}
+	// Use the same ssN heuristic as the C Freetype (version 2.4.0)
+	// implementation.
+	ss2, ss3 := 32, 16
+	if width > 24 || height > 24 {
+		ss2, ss3 = 2*ss2, 2*ss3
+		if width > 120 || height > 120 {
+			ss2, ss3 = 2*ss2, 2*ss3
+		}
+	}
+	r.width = width
+	r.splitScale2 = ss2
+	r.splitScale3 = ss3
+	r.cell = r.cellBuf[:0]
+	if height > len(r.cellIndexBuf) {
+		r.cellIndex = make([]int, height)
+	} else {
+		r.cellIndex = r.cellIndexBuf[:height]
+	}
+	r.Clear()
+}
+
+// NewRasterizer creates a new Rasterizer with the given bounds.
+func NewRasterizer(width, height int) *Rasterizer {
+	r := new(Rasterizer)
+	r.SetBounds(width, height)
+	return r
+}

vendor/github.com/golang/freetype/raster/stroke.go

@@ -0,0 +1,483 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package raster
+
+import (
+	"golang.org/x/image/math/fixed"
+)
+
+// Two points are considered practically equal if the square of the distance
+// between them is less than one quarter (i.e. 1024 / 4096).
+const epsilon = fixed.Int52_12(1024)
+
+// A Capper signifies how to begin or end a stroked path.
+type Capper interface {
+	// Cap adds a cap to p given a pivot point and the normal vector of a
+	// terminal segment. The normal's length is half of the stroke width.
+	Cap(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6)
+}
+
+// The CapperFunc type adapts an ordinary function to be a Capper.
+type CapperFunc func(Adder, fixed.Int26_6, fixed.Point26_6, fixed.Point26_6)
+
+func (f CapperFunc) Cap(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
+	f(p, halfWidth, pivot, n1)
+}
+
+// A Joiner signifies how to join interior nodes of a stroked path.
+type Joiner interface {
+	// Join adds a join to the two sides of a stroked path given a pivot
+	// point and the normal vectors of the trailing and leading segments.
+	// Both normals have length equal to half of the stroke width.
+	Join(lhs, rhs Adder, halfWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6)
+}
+
+// The JoinerFunc type adapts an ordinary function to be a Joiner.
+type JoinerFunc func(lhs, rhs Adder, halfWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6)
+
+func (f JoinerFunc) Join(lhs, rhs Adder, halfWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6) {
+	f(lhs, rhs, halfWidth, pivot, n0, n1)
+}
+
+// RoundCapper adds round caps to a stroked path.
+var RoundCapper Capper = CapperFunc(roundCapper)
+
+func roundCapper(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
+	// The cubic Bézier approximation to a circle involves the magic number
+	// (√2 - 1) * 4/3, which is approximately 35/64.
+	const k = 35
+	e := pRot90CCW(n1)
+	side := pivot.Add(e)
+	start, end := pivot.Sub(n1), pivot.Add(n1)
+	d, e := n1.Mul(k), e.Mul(k)
+	p.Add3(start.Add(e), side.Sub(d), side)
+	p.Add3(side.Add(d), end.Add(e), end)
+}
+
+// ButtCapper adds butt caps to a stroked path.
+var ButtCapper Capper = CapperFunc(buttCapper)
+
+func buttCapper(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
+	p.Add1(pivot.Add(n1))
+}
+
+// SquareCapper adds square caps to a stroked path.
+var SquareCapper Capper = CapperFunc(squareCapper)
+
+func squareCapper(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
+	e := pRot90CCW(n1)
+	side := pivot.Add(e)
+	p.Add1(side.Sub(n1))
+	p.Add1(side.Add(n1))
+	p.Add1(pivot.Add(n1))
+}
+
+// RoundJoiner adds round joins to a stroked path.
+var RoundJoiner Joiner = JoinerFunc(roundJoiner)
+
+func roundJoiner(lhs, rhs Adder, haflWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6) {
+	dot := pDot(pRot90CW(n0), n1)
+	if dot >= 0 {
+		addArc(lhs, pivot, n0, n1)
+		rhs.Add1(pivot.Sub(n1))
+	} else {
+		lhs.Add1(pivot.Add(n1))
+		addArc(rhs, pivot, pNeg(n0), pNeg(n1))
+	}
+}
+
+// BevelJoiner adds bevel joins to a stroked path.
+var BevelJoiner Joiner = JoinerFunc(bevelJoiner)
+
+func bevelJoiner(lhs, rhs Adder, haflWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6) {
+	lhs.Add1(pivot.Add(n1))
+	rhs.Add1(pivot.Sub(n1))
+}
+
+// addArc adds a circular arc from pivot+n0 to pivot+n1 to p. The shorter of
+// the two possible arcs is taken, i.e. the one spanning <= 180 degrees. The
+// two vectors n0 and n1 must be of equal length.
+func addArc(p Adder, pivot, n0, n1 fixed.Point26_6) {
+	// r2 is the square of the length of n0.
+	r2 := pDot(n0, n0)
+	if r2 < epsilon {
+		// The arc radius is so small that we collapse to a straight line.
+		p.Add1(pivot.Add(n1))
+		return
+	}
+	// We approximate the arc by 0, 1, 2 or 3 45-degree quadratic segments plus
+	// a final quadratic segment from s to n1. Each 45-degree segment has
+	// control points {1, 0}, {1, tan(π/8)} and {1/√2, 1/√2} suitably scaled,
+	// rotated and translated. tan(π/8) is approximately 27/64.
+	const tpo8 = 27
+	var s fixed.Point26_6
+	// We determine which octant the angle between n0 and n1 is in via three
+	// dot products. m0, m1 and m2 are n0 rotated clockwise by 45, 90 and 135
+	// degrees.
+	m0 := pRot45CW(n0)
+	m1 := pRot90CW(n0)
+	m2 := pRot90CW(m0)
+	if pDot(m1, n1) >= 0 {
+		if pDot(n0, n1) >= 0 {
+			if pDot(m2, n1) <= 0 {
+				// n1 is between 0 and 45 degrees clockwise of n0.
+				s = n0
+			} else {
+				// n1 is between 45 and 90 degrees clockwise of n0.
+				p.Add2(pivot.Add(n0).Add(m1.Mul(tpo8)), pivot.Add(m0))
+				s = m0
+			}
+		} else {
+			pm1, n0t := pivot.Add(m1), n0.Mul(tpo8)
+			p.Add2(pivot.Add(n0).Add(m1.Mul(tpo8)), pivot.Add(m0))
+			p.Add2(pm1.Add(n0t), pm1)
+			if pDot(m0, n1) >= 0 {
+				// n1 is between 90 and 135 degrees clockwise of n0.
+				s = m1
+			} else {
+				// n1 is between 135 and 180 degrees clockwise of n0.
+				p.Add2(pm1.Sub(n0t), pivot.Add(m2))
+				s = m2
+			}
+		}
+	} else {
+		if pDot(n0, n1) >= 0 {
+			if pDot(m0, n1) >= 0 {
+				// n1 is between 0 and 45 degrees counter-clockwise of n0.
+				s = n0
+			} else {
+				// n1 is between 45 and 90 degrees counter-clockwise of n0.
+				p.Add2(pivot.Add(n0).Sub(m1.Mul(tpo8)), pivot.Sub(m2))
+				s = pNeg(m2)
+			}
+		} else {
+			pm1, n0t := pivot.Sub(m1), n0.Mul(tpo8)
+			p.Add2(pivot.Add(n0).Sub(m1.Mul(tpo8)), pivot.Sub(m2))
+			p.Add2(pm1.Add(n0t), pm1)
+			if pDot(m2, n1) <= 0 {
+				// n1 is between 90 and 135 degrees counter-clockwise of n0.
+				s = pNeg(m1)
+			} else {
+				// n1 is between 135 and 180 degrees counter-clockwise of n0.
+				p.Add2(pm1.Sub(n0t), pivot.Sub(m0))
+				s = pNeg(m0)
+			}
+		}
+	}
+	// The final quadratic segment has two endpoints s and n1 and the middle
+	// control point is a multiple of s.Add(n1), i.e. it is on the angle
+	// bisector of those two points. The multiple ranges between 128/256 and
+	// 150/256 as the angle between s and n1 ranges between 0 and 45 degrees.
+	//
+	// When the angle is 0 degrees (i.e. s and n1 are coincident) then
+	// s.Add(n1) is twice s and so the middle control point of the degenerate
+	// quadratic segment should be half s.Add(n1), and half = 128/256.
+	//
+	// When the angle is 45 degrees then 150/256 is the ratio of the lengths of
+	// the two vectors {1, tan(π/8)} and {1 + 1/√2, 1/√2}.
+	//
+	// d is the normalized dot product between s and n1. Since the angle ranges
+	// between 0 and 45 degrees then d ranges between 256/256 and 181/256.
+	d := 256 * pDot(s, n1) / r2
+	multiple := fixed.Int26_6(150-(150-128)*(d-181)/(256-181)) >> 2
+	p.Add2(pivot.Add(s.Add(n1).Mul(multiple)), pivot.Add(n1))
+}
+
+// midpoint returns the midpoint of two Points.
+func midpoint(a, b fixed.Point26_6) fixed.Point26_6 {
+	return fixed.Point26_6{(a.X + b.X) / 2, (a.Y + b.Y) / 2}
+}
+
+// angleGreaterThan45 returns whether the angle between two vectors is more
+// than 45 degrees.
+func angleGreaterThan45(v0, v1 fixed.Point26_6) bool {
+	v := pRot45CCW(v0)
+	return pDot(v, v1) < 0 || pDot(pRot90CW(v), v1) < 0
+}
+
+// interpolate returns the point (1-t)*a + t*b.
+func interpolate(a, b fixed.Point26_6, t fixed.Int52_12) fixed.Point26_6 {
+	s := 1<<12 - t
+	x := s*fixed.Int52_12(a.X) + t*fixed.Int52_12(b.X)
+	y := s*fixed.Int52_12(a.Y) + t*fixed.Int52_12(b.Y)
+	return fixed.Point26_6{fixed.Int26_6(x >> 12), fixed.Int26_6(y >> 12)}
+}
+
+// curviest2 returns the value of t for which the quadratic parametric curve
+// (1-t)²*a + 2*t*(1-t).b + t²*c has maximum curvature.
+//
+// The curvature of the parametric curve f(t) = (x(t), y(t)) is
+// |x′y″-y′x″| / (x′²+y′²)^(3/2).
+//
+// Let d = b-a and e = c-2*b+a, so that f′(t) = 2*d+2*e*t and f″(t) = 2*e.
+// The curvature's numerator is (2*dx+2*ex*t)*(2*ey)-(2*dy+2*ey*t)*(2*ex),
+// which simplifies to 4*dx*ey-4*dy*ex, which is constant with respect to t.
+//
+// Thus, curvature is extreme where the denominator is extreme, i.e. where
+// (x′²+y′²) is extreme. The first order condition is that
+// 2*x′*x″+2*y′*y″ = 0, or (dx+ex*t)*ex + (dy+ey*t)*ey = 0.
+// Solving for t gives t = -(dx*ex+dy*ey) / (ex*ex+ey*ey).
+func curviest2(a, b, c fixed.Point26_6) fixed.Int52_12 {
+	dx := int64(b.X - a.X)
+	dy := int64(b.Y - a.Y)
+	ex := int64(c.X - 2*b.X + a.X)
+	ey := int64(c.Y - 2*b.Y + a.Y)
+	if ex == 0 && ey == 0 {
+		return 2048
+	}
+	return fixed.Int52_12(-4096 * (dx*ex + dy*ey) / (ex*ex + ey*ey))
+}
+
+// A stroker holds state for stroking a path.
+type stroker struct {
+	// p is the destination that records the stroked path.
+	p Adder
+	// u is the half-width of the stroke.
+	u fixed.Int26_6
+	// cr and jr specify how to end and connect path segments.
+	cr Capper
+	jr Joiner
+	// r is the reverse path. Stroking a path involves constructing two
+	// parallel paths 2*u apart. The first path is added immediately to p,
+	// the second path is accumulated in r and eventually added in reverse.
+	r Path
+	// a is the most recent segment point. anorm is the segment normal of
+	// length u at that point.
+	a, anorm fixed.Point26_6
+}
+
+// addNonCurvy2 adds a quadratic segment to the stroker, where the segment
+// defined by (k.a, b, c) achieves maximum curvature at either k.a or c.
+func (k *stroker) addNonCurvy2(b, c fixed.Point26_6) {
+	// We repeatedly divide the segment at its middle until it is straight
+	// enough to approximate the stroke by just translating the control points.
+	// ds and ps are stacks of depths and points. t is the top of the stack.
+	const maxDepth = 5
+	var (
+		ds [maxDepth + 1]int
+		ps [2*maxDepth + 3]fixed.Point26_6
+		t  int
+	)
+	// Initially the ps stack has one quadratic segment of depth zero.
+	ds[0] = 0
+	ps[2] = k.a
+	ps[1] = b
+	ps[0] = c
+	anorm := k.anorm
+	var cnorm fixed.Point26_6
+
+	for {
+		depth := ds[t]
+		a := ps[2*t+2]
+		b := ps[2*t+1]
+		c := ps[2*t+0]
+		ab := b.Sub(a)
+		bc := c.Sub(b)
+		abIsSmall := pDot(ab, ab) < fixed.Int52_12(1<<12)
+		bcIsSmall := pDot(bc, bc) < fixed.Int52_12(1<<12)
+		if abIsSmall && bcIsSmall {
+			// Approximate the segment by a circular arc.
+			cnorm = pRot90CCW(pNorm(bc, k.u))
+			mac := midpoint(a, c)
+			addArc(k.p, mac, anorm, cnorm)
+			addArc(&k.r, mac, pNeg(anorm), pNeg(cnorm))
+		} else if depth < maxDepth && angleGreaterThan45(ab, bc) {
+			// Divide the segment in two and push both halves on the stack.
+			mab := midpoint(a, b)
+			mbc := midpoint(b, c)
+			t++
+			ds[t+0] = depth + 1
+			ds[t-1] = depth + 1
+			ps[2*t+2] = a
+			ps[2*t+1] = mab
+			ps[2*t+0] = midpoint(mab, mbc)
+			ps[2*t-1] = mbc
+			continue
+		} else {
+			// Translate the control points.
+			bnorm := pRot90CCW(pNorm(c.Sub(a), k.u))
+			cnorm = pRot90CCW(pNorm(bc, k.u))
+			k.p.Add2(b.Add(bnorm), c.Add(cnorm))
+			k.r.Add2(b.Sub(bnorm), c.Sub(cnorm))
+		}
+		if t == 0 {
+			k.a, k.anorm = c, cnorm
+			return
+		}
+		t--
+		anorm = cnorm
+	}
+	panic("unreachable")
+}
+
+// Add1 adds a linear segment to the stroker.
+func (k *stroker) Add1(b fixed.Point26_6) {
+	bnorm := pRot90CCW(pNorm(b.Sub(k.a), k.u))
+	if len(k.r) == 0 {
+		k.p.Start(k.a.Add(bnorm))
+		k.r.Start(k.a.Sub(bnorm))
+	} else {
+		k.jr.Join(k.p, &k.r, k.u, k.a, k.anorm, bnorm)
+	}
+	k.p.Add1(b.Add(bnorm))
+	k.r.Add1(b.Sub(bnorm))
+	k.a, k.anorm = b, bnorm
+}
+
+// Add2 adds a quadratic segment to the stroker.
+func (k *stroker) Add2(b, c fixed.Point26_6) {
+	ab := b.Sub(k.a)
+	bc := c.Sub(b)
+	abnorm := pRot90CCW(pNorm(ab, k.u))
+	if len(k.r) == 0 {
+		k.p.Start(k.a.Add(abnorm))
+		k.r.Start(k.a.Sub(abnorm))
+	} else {
+		k.jr.Join(k.p, &k.r, k.u, k.a, k.anorm, abnorm)
+	}
+
+	// Approximate nearly-degenerate quadratics by linear segments.
+	abIsSmall := pDot(ab, ab) < epsilon
+	bcIsSmall := pDot(bc, bc) < epsilon
+	if abIsSmall || bcIsSmall {
+		acnorm := pRot90CCW(pNorm(c.Sub(k.a), k.u))
+		k.p.Add1(c.Add(acnorm))
+		k.r.Add1(c.Sub(acnorm))
+		k.a, k.anorm = c, acnorm
+		return
+	}
+
+	// The quadratic segment (k.a, b, c) has a point of maximum curvature.
+	// If this occurs at an end point, we process the segment as a whole.
+	t := curviest2(k.a, b, c)
+	if t <= 0 || 4096 <= t {
+		k.addNonCurvy2(b, c)
+		return
+	}
+
+	// Otherwise, we perform a de Casteljau decomposition at the point of
+	// maximum curvature and process the two straighter parts.
+	mab := interpolate(k.a, b, t)
+	mbc := interpolate(b, c, t)
+	mabc := interpolate(mab, mbc, t)
+
+	// If the vectors ab and bc are close to being in opposite directions,
+	// then the decomposition can become unstable, so we approximate the
+	// quadratic segment by two linear segments joined by an arc.
+	bcnorm := pRot90CCW(pNorm(bc, k.u))
+	if pDot(abnorm, bcnorm) < -fixed.Int52_12(k.u)*fixed.Int52_12(k.u)*2047/2048 {
+		pArc := pDot(abnorm, bc) < 0
+
+		k.p.Add1(mabc.Add(abnorm))
+		if pArc {
+			z := pRot90CW(abnorm)
+			addArc(k.p, mabc, abnorm, z)
+			addArc(k.p, mabc, z, bcnorm)
+		}
+		k.p.Add1(mabc.Add(bcnorm))
+		k.p.Add1(c.Add(bcnorm))
+
+		k.r.Add1(mabc.Sub(abnorm))
+		if !pArc {
+			z := pRot90CW(abnorm)
+			addArc(&k.r, mabc, pNeg(abnorm), z)
+			addArc(&k.r, mabc, z, pNeg(bcnorm))
+		}
+		k.r.Add1(mabc.Sub(bcnorm))
+		k.r.Add1(c.Sub(bcnorm))
+
+		k.a, k.anorm = c, bcnorm
+		return
+	}
+
+	// Process the decomposed parts.
+	k.addNonCurvy2(mab, mabc)
+	k.addNonCurvy2(mbc, c)
+}
+
+// Add3 adds a cubic segment to the stroker.
+func (k *stroker) Add3(b, c, d fixed.Point26_6) {
+	panic("freetype/raster: stroke unimplemented for cubic segments")
+}
+
+// stroke adds the stroked Path q to p, where q consists of exactly one curve.
+func (k *stroker) stroke(q Path) {
+	// Stroking is implemented by deriving two paths each k.u apart from q.
+	// The left-hand-side path is added immediately to k.p; the right-hand-side
+	// path is accumulated in k.r. Once we've finished adding the LHS to k.p,
+	// we add the RHS in reverse order.
+	k.r = make(Path, 0, len(q))
+	k.a = fixed.Point26_6{q[1], q[2]}
+	for i := 4; i < len(q); {
+		switch q[i] {
+		case 1:
+			k.Add1(
+				fixed.Point26_6{q[i+1], q[i+2]},
+			)
+			i += 4
+		case 2:
+			k.Add2(
+				fixed.Point26_6{q[i+1], q[i+2]},
+				fixed.Point26_6{q[i+3], q[i+4]},
+			)
+			i += 6
+		case 3:
+			k.Add3(
+				fixed.Point26_6{q[i+1], q[i+2]},
+				fixed.Point26_6{q[i+3], q[i+4]},
+				fixed.Point26_6{q[i+5], q[i+6]},
+			)
+			i += 8
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+	if len(k.r) == 0 {
+		return
+	}
+	// TODO(nigeltao): if q is a closed curve then we should join the first and
+	// last segments instead of capping them.
+	k.cr.Cap(k.p, k.u, q.lastPoint(), pNeg(k.anorm))
+	addPathReversed(k.p, k.r)
+	pivot := q.firstPoint()
+	k.cr.Cap(k.p, k.u, pivot, pivot.Sub(fixed.Point26_6{k.r[1], k.r[2]}))
+}
+
+// Stroke adds q stroked with the given width to p. The result is typically
+// self-intersecting and should be rasterized with UseNonZeroWinding.
+// cr and jr may be nil, which defaults to a RoundCapper or RoundJoiner.
+func Stroke(p Adder, q Path, width fixed.Int26_6, cr Capper, jr Joiner) {
+	if len(q) == 0 {
+		return
+	}
+	if cr == nil {
+		cr = RoundCapper
+	}
+	if jr == nil {
+		jr = RoundJoiner
+	}
+	if q[0] != 0 {
+		panic("freetype/raster: bad path")
+	}
+	s := stroker{p: p, u: width / 2, cr: cr, jr: jr}
+	i := 0
+	for j := 4; j < len(q); {
+		switch q[j] {
+		case 0:
+			s.stroke(q[i:j])
+			i, j = j, j+4
+		case 1:
+			j += 4
+		case 2:
+			j += 6
+		case 3:
+			j += 8
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+	s.stroke(q[i:])
+}

vendor/github.com/golang/freetype/testdata/COPYING

@@ -0,0 +1,42 @@
+Luxi fonts copyright (c) 2001 by Bigelow & Holmes Inc. Luxi font 
+instruction code copyright (c) 2001 by URW++ GmbH. All Rights 
+Reserved. Luxi is a registered trademark of Bigelow & Holmes Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining 
+a copy of these Fonts and associated documentation files (the "Font 
+Software"), to deal in the Font Software, including without 
+limitation the rights to use, copy, merge, publish, distribute, 
+sublicense, and/or sell copies of the Font Software, and to permit 
+persons to whom the Font Software is furnished to do so, subject to 
+the following conditions:
+
+The above copyright and trademark notices and this permission notice 
+shall be included in all copies of one or more of the Font Software.
+
+The Font Software may not be modified, altered, or added to, and in 
+particular the designs of glyphs or characters in the Fonts may not 
+be modified nor may additional glyphs or characters be added to the 
+Fonts. This License becomes null and void when the Fonts or Font 
+Software have been modified.
+
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF 
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT 
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT.  IN NO EVENT SHALL 
+BIGELOW & HOLMES INC. OR URW++ GMBH. BE LIABLE FOR ANY CLAIM, DAMAGES 
+OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL, INDIRECT, 
+INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF 
+CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR 
+INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE FONT 
+SOFTWARE.
+
+Except as contained in this notice, the names of Bigelow & Holmes 
+Inc. and URW++ GmbH. shall not be used in advertising or otherwise to 
+promote the sale, use or other dealings in this Font Software without 
+prior written authorization from Bigelow & Holmes Inc. and URW++ GmbH.
+
+For further information, contact:
+
+info@urwpp.de
+or
+design@bigelowandholmes.com

vendor/github.com/golang/freetype/testdata/README

@@ -0,0 +1,13 @@
+The luxi*.ttf and COPYING files in this directory were copied from the X.org
+project, specifically
+http://xorg.freedesktop.org/releases/individual/font/font-bh-ttf-1.0.0.tar.bz2
+
+There are three Luxi fonts: sans (s), serif (r) and monospaced (m). For example,
+luxisr.ttf is Luxi Sans. The 'r' here means regular, as opposed to bold.
+
+The *.ttx files in this directory were generated from the *.ttf files
+by the ttx command-line tool.
+http://www.letterror.com/code/ttx/index.html
+
+The *-hinting.txt files in this directory were generated from the *.ttf files
+by the ../cmd/print-glyph-points command-line tool.

vendor/github.com/golang/freetype/testdata/luxisr-12pt-sans-hinting.txt

@@ -0,0 +1,392 @@
+freetype version 2.5.1
+213 21 0 192 555;21 0 1, 21 555 1, 192 555 1, 192 0 1, 171 21 1, 171 534 1, 43 534 1, 43 21 1
+0 0 0 0 0;
+213 0 0 0 0;
+213 0 0 0 0;
+213 70 0 144 555;70 0 1, 70 74 1, 144 74 1, 144 0 1, 79 148 1, 70 444 1, 70 555 1, 144 555 1, 144 444 1, 135 148 1
+273 35 407 238 592;44 407 1, 35 592 1, 108 592 1, 99 407 1, 173 407 1, 164 592 1, 238 592 1, 229 407 1
+427 9 0 418 555;47 0 1, 89 167 1, 9 167 1, 18 213 1, 100 213 1, 133 342 1, 44 342 1, 54 389 1, 144 389 1, 186 555 1, 234 555 1, 192 389 1, 291 389 1, 332 555 1, 380 555 1, 339 389 1, 418 389 1, 409 342 1, 327 342 1, 294 213 1, 383 213 1, 374 167 1, 283 167 1, 242 0 1, 194 0 1, 235 167 1, 137 167 1, 95 0 1, 148 213 1, 247 213 1, 279 342 1, 180 342 1
+427 39 -46 353 602;187 -46 1, 187 0 1, 121 0 0, 39 31 1, 39 95 1, 123 56 0, 187 56 1, 187 255 1, 117 298 0, 88 330 1, 55 368 0, 55 422 1, 55 486 0, 103 524 1, 135 550 0, 187 555 1, 187 602 1, 224 602 1, 224 555 1, 278 555 0, 344 530 1, 344 470 1, 273 501 0, 224 504 1, 224 307 1, 228 304 1, 238 298 0, 247 293 1, 251 290 1, 299 262 0, 322 237 1, 353 205 0, 353 155 1, 353 87 0, 308 42 1, 276 12 0, 224 0 1, 224 -46 1, 224 60 1, 288 85 0, 288 144 1, 288 175 0, 270 195 1, 257 210 0, 224 233 1, 187 331 1, 187 502 1, 120 479 0, 120 425 1, 120 376 0
+683 42 -14 641 569;94 -14 1, 531 569 1, 589 569 1, 152 -14 1, 161 555 1, 216 555 0, 248 518 1, 280 480 0, 280 416 1, 280 352 0, 248 315 1, 216 278 0, 161 278 1, 106 278 0, 74 315 1, 42 353 0, 42 418 1, 42 475 0, 68 511 1, 101 555 0, 161 518 1, 134 518 0, 117 491 1, 100 462 0, 100 419 1, 100 375 0, 114 348 1, 131 315 0, 161 315 1, 189 315 0, 206 343 1, 222 371 0, 222 416 1, 222 462 0, 206 490 1, 188 518 0, 522 278 1, 577 278 0, 609 240 1, 641 203 0, 641 139 1, 641 75 0, 609 38 1, 577 0 0, 522 0 1, 467 0 0, 435 38 1, 403 75 0, 403 141 1, 403 198 0, 429 233 1, 462 278 0, 522 241 1, 494 241 0, 477 213 1, 461 185 0, 461 141 1, 461 98 0, 474 71 1, 491 37 0, 522 37 1, 549 37 0, 566 65 1, 583 93 0, 583 139 1, 583 185 0, 566 213 1, 549 241 0
+512 21 -14 485 569;384 0 1, 357 33 1, 282 -14 0, 214 -14 1, 132 -14 0, 77 37 1, 21 88 0, 21 166 1, 21 243 0, 69 290 1, 98 318 0, 152 339 1, 119 400 0, 119 445 1, 119 501 0, 153 535 1, 188 569 0, 247 569 1, 303 569 0, 336 539 1, 368 508 0, 368 457 1, 368 401 0, 325 360 1, 298 335 0, 248 312 1, 311 198 0, 373 123 1, 410 171 0, 410 265 1, 410 295 1, 483 295 1, 483 165 0, 408 83 1, 441 41 0, 485 0 1, 325 76 1, 251 160 0, 178 296 1, 141 279 0, 123 257 1, 95 225 0, 95 179 1, 95 122 0, 134 82 1, 172 42 0, 226 42 1, 268 42 0, 220 359 1, 256 374 0, 273 392 1, 299 419 0, 299 456 1, 299 513 0, 246 513 1, 191 513 0, 191 453 1, 191 416 0, 217 365 1
+147 27 389 120 592;45 389 1, 27 592 1, 120 592 1, 101 389 1
+256 49 -111 225 592;225 -60 1, 225 -111 1, 150 -58 0, 107 21 1, 49 123 0, 49 241 1, 49 364 0, 111 470 1, 154 542 0, 225 592 1, 225 541 1, 174 485 0, 152 426 1, 123 353 0, 123 241 1, 123 124 0, 154 48 1, 177 -7 0
+256 31 -111 207 592;31 541 1, 31 592 1, 106 539 0, 150 461 1, 207 359 0, 207 241 1, 207 117 0, 144 12 1, 102 -60 0, 31 -111 1, 31 -60 1, 81 -3 0, 104 56 1, 132 129 0, 132 241 1, 132 357 0, 101 433 1, 79 487 0
+299 15 282 284 555;267 483 1, 284 431 1, 180 406 1, 180 407 1, 180 411 0, 180 411 1, 180 411 1, 180 427 0, 170 437 1, 255 314 1, 210 282 1, 152 382 1, 170 384 0, 178 401 1, 88 282 1, 43 314 1, 120 401 1, 128 384 0, 147 382 1, 15 431 1, 32 483 1, 129 437 1, 118 427 0, 118 411 1, 118 411 1, 118 411 0, 118 409 1, 119 408 1, 119 407 0, 119 406 1, 122 555 1, 177 555 1, 165 440 1, 157 444 0, 149 444 1, 141 444 0, 133 440 1
+449 39 37 409 407;196 37 1, 196 194 1, 39 194 1, 39 250 1, 196 250 1, 196 407 1, 252 407 1, 252 250 1, 409 250 1, 409 194 1, 252 194 1, 252 37 1
+213 60 -120 153 93;60 -120 1, 60 -93 1, 96 -83 0, 96 -8 1, 96 0 1, 60 0 1, 60 93 1, 153 93 1, 153 12 1, 153 -110 0
+256 33 194 223 250;33 194 1, 33 250 1, 223 250 1, 223 194 1
+213 60 0 153 93;60 0 1, 60 93 1, 153 93 1, 153 0 1
+213 -22 -111 236 555;-22 -111 1, 178 555 1, 236 555 1, 36 -111 1
+427 30 -14 397 569;213 569 1, 298 569 0, 347 491 1, 397 413 0, 397 279 1, 397 142 0, 347 64 1, 298 -14 0, 211 -14 1, 137 -14 0, 90 50 1, 30 130 0, 30 278 1, 30 413 0, 80 491 1, 129 569 0, 213 513 1, 163 513 0, 136 452 1, 109 390 0, 109 278 1, 109 167 0, 136 104 1, 163 42 0, 214 42 1, 260 42 0, 285 87 1, 318 148 0, 318 279 1, 318 392 0, 291 452 1, 263 513 0
+427 86 0 383 569;86 0 1, 86 56 1, 197 56 1, 197 494 1, 86 466 1, 86 523 1, 272 569 1, 272 56 1, 383 56 1, 383 0 1
+427 38 0 353 569;38 0 1, 38 65 1, 64 125 0, 125 188 1, 165 230 1, 202 267 1, 274 341 0, 274 415 1, 274 468 0, 246 493 1, 224 514 0, 184 514 1, 132 514 0, 52 469 1, 52 534 1, 128 569 0, 194 569 1, 267 569 0, 310 527 1, 353 485 0, 353 413 1, 353 364 0, 331 326 1, 308 287 0, 247 233 1, 221 209 1, 143 139 0, 128 65 1, 350 65 1, 350 0 1
+427 57 -14 362 569;57 4 1, 57 73 1, 60 72 1, 70 68 0, 74 67 1, 115 52 0, 129 48 1, 154 42 0, 174 42 1, 230 42 0, 258 73 1, 283 100 0, 283 150 1, 283 208 0, 245 239 1, 208 270 0, 138 270 1, 109 270 1, 109 320 1, 134 320 1, 199 321 0, 234 350 1, 270 379 0, 270 430 1, 270 513 0, 180 513 1, 134 513 0, 65 482 1, 65 547 1, 133 569 0, 185 569 1, 275 569 0, 315 526 1, 344 494 0, 344 441 1, 344 381 0, 302 343 1, 277 320 0, 228 301 1, 271 290 0, 293 277 1, 362 237 0, 362 153 1, 362 77 0, 312 32 1, 263 -14 0, 181 -14 1, 137 -14 0
+427 12 0 402 555;258 0 1, 258 157 1, 12 157 1, 12 213 1, 258 555 1, 327 555 1, 327 218 1, 402 218 1, 402 157 1, 327 157 1, 327 0 1, 84 218 1, 263 218 1, 263 464 1
+427 61 -14 362 555;61 -2 1, 61 64 1, 118 42 0, 166 42 1, 221 42 0, 252 74 1, 284 107 0, 284 162 1, 284 288 0, 113 288 1, 92 288 0, 71 285 1, 71 555 1, 351 555 1, 351 491 1, 135 491 1, 135 344 1, 234 343 0, 291 304 1, 362 255 0, 362 159 1, 362 78 0, 308 32 1, 253 -14 0, 158 -14 1, 116 -14 0
+427 32 -14 385 569;112 292 1, 164 356 0, 238 356 1, 306 356 0, 346 310 1, 385 264 0, 385 182 1, 385 92 0, 339 39 1, 292 -14 0, 214 -14 1, 129 -14 0, 80 59 1, 32 132 0, 32 260 1, 32 405 0, 90 487 1, 148 569 0, 251 569 1, 298 569 0, 355 548 1, 355 484 1, 287 514 0, 249 514 1, 166 514 0, 133 431 1, 120 398 0, 115 357 1, 113 335 0, 218 303 1, 172 303 0, 143 271 1, 114 239 0, 114 183 1, 114 122 0, 144 82 1, 174 42 0, 221 42 1, 312 42 0, 312 167 1, 312 303 0
+427 51 0 407 555;83 0 1, 94 65 0, 114 112 1, 134 159 0, 185 242 1, 337 486 1, 51 486 1, 51 555 1, 407 555 1, 407 486 1, 194 171 0, 168 0 1
+427 37 -14 408 569;147 302 1, 111 329 0, 92 353 1, 66 389 0, 66 429 1, 66 491 0, 112 530 1, 158 569 0, 233 569 1, 302 569 0, 344 536 1, 386 503 0, 386 449 1, 386 400 0, 349 357 1, 326 331 0, 283 302 1, 339 273 0, 368 243 1, 408 199 0, 408 143 1, 408 74 0, 356 30 1, 303 -14 0, 219 -14 1, 137 -14 0, 87 28 1, 37 69 0, 37 138 1, 37 198 0, 78 245 1, 102 274 0, 242 326 1, 319 379 0, 319 437 1, 319 472 0, 294 492 1, 268 513 0, 225 513 1, 183 513 0, 158 494 1, 133 474 0, 133 441 1, 133 402 0, 176 368 1, 197 351 0, 188 272 1, 146 240 0, 130 216 1, 111 189 0, 111 149 1, 111 101 0, 142 71 1, 173 42 0, 223 42 1, 271 42 0, 302 67 1, 332 92 0, 332 132 1, 332 168 0, 309 192 1, 289 212 0, 240 241 1
+427 32 -14 385 569;305 263 1, 253 199 0, 179 199 1, 110 199 0, 71 245 1, 32 292 0, 32 373 1, 32 463 0, 78 516 1, 124 569 0, 202 569 1, 288 569 0, 336 496 1, 385 423 0, 385 296 1, 385 150 0, 327 68 1, 269 -14 0, 166 -14 1, 118 -14 0, 61 7 1, 61 71 1, 130 42 0, 168 42 1, 251 42 0, 284 125 1, 297 158 0, 302 198 1, 304 220 0, 196 513 1, 104 513 0, 104 389 1, 104 252 0, 198 252 1, 245 252 0, 273 284 1, 302 317 0, 302 372 1, 302 433 0, 273 473 1, 243 513 0
+213 70 0 144 407;70 0 1, 70 74 1, 144 74 1, 144 0 1, 70 333 1, 70 407 1, 144 407 1, 144 333 1
+213 70 -120 144 407;70 -120 1, 70 -93 1, 96 -79 0, 96 -9 1, 96 0 1, 70 0 1, 70 74 1, 144 74 1, 144 12 1, 143 -102 0, 70 333 1, 70 407 1, 144 407 1, 144 333 1
+449 39 37 409 407;409 37 1, 39 222 1, 409 407 1, 409 345 1, 164 222 1, 164 222 1, 409 99 1
+449 39 125 409 319;39 125 1, 39 180 1, 409 180 1, 409 125 1, 39 264 1, 39 319 1, 409 319 1, 409 264 1
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+171 -58 -157 124 407;-58 -145 1, -58 -87 1, -28 -102 0, -2 -102 1, 35 -102 0, 43 -74 1, 50 -51 0, 50 0 1, 50 407 1, 124 407 1, 124 0 1, 124 -157 0, 4 -157 1, -29 -157 0
+213 0 0 0 0;

vendor/github.com/golang/freetype/testdata/luxisr-12pt-with-hinting.txt

@@ -0,0 +1,392 @@
+freetype version 2.5.1
+192 0 0 192 576;0 0 1, 0 576 1, 192 576 1, 192 0 1, 128 64 1, 128 512 1, 64 512 1, 64 64 1
+0 0 0 0 0;
+192 0 0 0 0;
+192 0 0 0 0;
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+256 0 384 256 576;44 384 1, 35 576 1, 108 576 1, 99 384 1, 173 384 1, 164 576 1, 238 576 1, 229 384 1
+448 0 0 448 576;47 25 1, 89 192 1, 9 192 1, 18 256 1, 100 256 1, 133 320 1, 44 320 1, 54 384 1, 144 384 1, 186 551 1, 234 551 1, 192 384 1, 291 384 1, 332 551 1, 380 551 1, 339 384 1, 418 384 1, 409 320 1, 327 320 1, 294 256 1, 383 256 1, 374 192 1, 283 192 1, 242 25 1, 194 25 1, 235 192 1, 137 192 1, 95 25 1, 148 256 1, 247 256 1, 279 320 1, 180 320 1
+448 64 -64 320 640;192 -46 1, 192 0 1, 135 0 0, 64 31 1, 64 95 1, 137 56 0, 192 56 1, 192 255 1, 124 298 0, 96 331 1, 64 368 0, 64 422 1, 64 486 0, 110 524 1, 142 550 0, 192 555 1, 192 602 1, 256 602 1, 256 555 1, 285 555 0, 320 530 1, 320 470 1, 282 500 0, 256 504 1, 256 307 1, 258 304 1, 263 298 0, 267 293 1, 270 290 1, 293 262 0, 305 237 1, 320 205 0, 320 155 1, 320 87 0, 297 42 1, 282 12 0, 256 0 1, 256 -46 1, 256 60 1, 256 85 0, 256 144 1, 256 175 0, 256 195 1, 256 210 0, 256 233 1, 192 331 1, 192 502 1, 128 479 0, 128 425 1, 128 376 0
+704 64 0 640 576;94 0 1, 531 576 1, 589 576 1, 152 0 1, 160 576 1, 204 576 0, 230 542 1, 256 507 0, 256 448 1, 256 389 0, 230 355 1, 204 320 0, 160 320 1, 115 320 0, 90 355 1, 64 389 0, 64 450 1, 64 502 0, 85 535 1, 112 576 0, 160 512 1, 146 512 0, 137 495 1, 128 477 0, 128 449 1, 128 422 0, 135 405 1, 144 384 0, 160 384 1, 174 384 0, 183 402 1, 192 419 0, 192 448 1, 192 477 0, 183 494 1, 174 512 0, 512 320 1, 571 320 0, 606 277 1, 640 234 0, 640 160 1, 640 86 0, 606 43 1, 571 0 0, 512 0 1, 453 0 0, 418 43 1, 384 86 0, 384 162 1, 384 228 0, 412 269 1, 448 320 0, 512 256 1, 483 256 0, 466 230 1, 448 203 0, 448 162 1, 448 122 0, 462 96 1, 480 64 0, 512 64 1, 541 64 0, 558 91 1, 576 117 0, 576 160 1, 576 203 0, 558 229 1, 541 256 0
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+128 0 384 128 576;45 384 1, 27 576 1, 120 576 1, 101 384 1
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+320 0 256 320 576;267 483 1, 284 415 1, 180 383 1, 180 384 1, 180 389 0, 192 390 1, 192 390 1, 192 411 0, 170 423 1, 255 296 1, 210 266 1, 152 360 1, 171 362 0, 178 378 1, 88 266 1, 43 296 1, 120 378 1, 128 362 0, 147 360 1, 15 415 1, 32 483 1, 129 423 1, 118 410 0, 118 389 1, 118 389 1, 118 389 0, 118 387 1, 119 386 1, 119 384 0, 119 383 1, 122 576 1, 177 576 1, 165 427 1, 157 448 0, 149 448 1, 140 448 0, 133 427 1
+448 64 64 384 384;192 64 1, 192 192 1, 64 192 1, 64 256 1, 192 256 1, 192 384 1, 256 384 1, 256 256 1, 384 256 1, 384 192 1, 256 192 1, 256 64 1
+192 64 -192 128 64;64 -149 1, 64 -121 1, 89 -111 0, 89 -36 1, 89 -29 1, 64 -29 1, 64 64 1, 128 64 1, 128 -16 1, 128 -139 0
+256 64 192 192 256;64 192 1, 64 256 1, 192 256 1, 192 192 1
+192 64 0 128 64;64 0 1, 64 64 1, 128 64 1, 128 0 1
+192 -64 -128 256 576;-22 -128 1, 178 576 1, 236 576 1, 36 -128 1
+448 0 0 384 576;192 576 1, 280 576 0, 332 499 1, 384 422 0, 384 289 1, 384 154 0, 332 77 1, 280 0 0, 190 0 1, 112 0 0, 63 63 1, 0 142 0, 0 289 1, 0 422 0, 52 499 1, 104 576 0, 192 512 1, 130 512 0, 97 454 1, 64 395 0, 64 288 1, 64 183 0, 97 123 1, 130 64 0, 192 64 1, 248 64 0, 279 107 1, 320 165 0, 320 289 1, 320 397 0, 287 454 1, 252 512 0
+448 64 0 384 640;64 0 1, 64 64 1, 192 64 1, 192 502 1, 64 474 1, 64 531 1, 256 577 1, 256 64 1, 384 64 1, 384 0 1
+448 64 0 320 576;64 0 1, 64 64 1, 85 124 0, 134 187 1, 167 228 1, 197 266 1, 256 339 0, 256 414 1, 256 466 0, 232 491 1, 213 512 0, 178 512 1, 133 512 0, 64 486 1, 64 554 1, 129 576 0, 185 576 1, 247 576 0, 283 533 1, 320 490 0, 320 418 1, 320 368 0, 301 330 1, 282 290 0, 230 234 1, 208 211 1, 142 139 0, 129 64 1, 320 64 1, 320 0 1
+448 64 0 384 576;64 4 1, 64 76 1, 67 76 1, 78 74 0, 83 74 1, 129 68 0, 146 66 1, 173 64 0, 196 64 1, 260 64 0, 292 94 1, 320 119 0, 320 167 1, 320 222 0, 272 251 1, 225 280 0, 137 280 1, 108 280 1, 108 332 1, 131 332 1, 191 333 0, 223 360 1, 256 387 0, 256 435 1, 256 512 0, 172 512 1, 129 512 0, 64 500 1, 64 568 1, 126 576 0, 174 576 1, 257 576 0, 293 534 1, 320 502 0, 320 450 1, 320 391 0, 287 353 1, 267 331 0, 228 312 1, 278 301 0, 303 288 1, 384 248 0, 384 165 1, 384 90 0, 332 45 1, 279 0 0, 194 0 1, 148 0 0
+448 0 0 384 576;256 0 1, 256 128 1, 0 128 1, 0 187 1, 256 576 1, 320 576 1, 320 192 1, 384 192 1, 384 128 1, 320 128 1, 320 0 1, 75 192 1, 256 192 1, 256 473 1
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+448 64 0 384 576;93 0 1, 103 68 0, 121 118 1, 139 168 0, 185 255 1, 321 512 1, 64 512 1, 64 576 1, 384 576 1, 384 512 1, 192 180 0, 169 0 1
+448 64 0 384 576;147 313 1, 110 339 0, 91 363 1, 64 398 0, 64 438 1, 64 499 0, 110 537 1, 156 576 0, 230 576 1, 299 576 0, 342 543 1, 384 511 0, 384 457 1, 384 410 0, 347 367 1, 325 341 0, 283 313 1, 328 284 0, 351 254 1, 384 211 0, 384 155 1, 384 87 0, 338 43 1, 293 0 0, 221 0 1, 150 0 0, 107 41 1, 64 82 0, 64 150 1, 64 210 0, 94 257 1, 113 285 0, 242 338 1, 320 387 0, 320 441 1, 320 473 0, 294 493 1, 267 512 0, 222 512 1, 180 512 0, 154 494 1, 128 476 0, 128 445 1, 128 409 0, 173 378 1, 195 362 0, 188 282 1, 156 252 0, 143 229 1, 128 204 0, 128 165 1, 128 120 0, 155 92 1, 181 64 0, 225 64 1, 267 64 0, 293 88 1, 320 111 0, 320 149 1, 320 183 0, 298 206 1, 280 225 0, 236 253 1
+448 64 0 384 576;308 273 1, 262 192 0, 195 192 1, 134 192 0, 99 240 1, 64 288 0, 64 373 1, 64 466 0, 106 521 1, 148 576 0, 218 576 1, 296 576 0, 340 504 1, 384 432 0, 384 306 1, 384 162 0, 327 81 1, 269 0 0, 168 0 1, 120 0 0, 64 7 1, 64 74 1, 133 64 0, 171 64 1, 254 64 0, 287 143 1, 300 173 0, 305 212 1, 307 232 0, 217 512 1, 128 512 0, 128 390 1, 128 256 0, 219 256 1, 264 256 0, 292 288 1, 320 320 0, 320 374 1, 320 433 0, 291 473 1, 262 512 0
+192 64 0 128 384;64 0 1, 64 64 1, 128 64 1, 128 0 1, 64 320 1, 64 384 1, 128 384 1, 128 320 1
+192 64 -128 128 384;64 -120 1, 64 -93 1, 87 -79 0, 87 -9 1, 87 0 1, 64 0 1, 64 64 1, 128 64 1, 128 10 1, 128 -102 0, 64 320 1, 64 384 1, 128 384 1, 128 320 1
+448 0 0 384 448;384 37 1, 14 222 1, 384 407 1, 384 345 1, 139 222 1, 139 222 1, 384 99 1
+448 64 128 384 320;64 128 1, 64 192 1, 384 192 1, 384 128 1, 64 256 1, 64 320 1, 384 320 1, 384 256 1
+448 64 0 448 448;64 407 1, 434 222 1, 64 37 1, 64 99 1, 309 222 1, 309 222 1, 64 345 1
+448 64 0 384 576;128 0 1, 128 64 1, 192 64 1, 192 0 1, 128 128 1, 128 150 1, 128 246 0, 201 297 1, 241 324 1, 320 377 0, 320 435 1, 320 512 0, 215 512 1, 150 512 0, 64 500 1, 64 568 1, 145 576 0, 213 576 1, 287 576 0, 330 550 1, 384 515 0, 384 441 1, 384 366 0, 301 319 1, 266 299 1, 222 275 0, 207 248 1, 192 222 0, 192 173 1, 192 128 1
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+512 0 0 512 576;7 0 1, 218 576 1, 296 576 1, 503 0 1, 419 0 1, 361 128 1, 138 128 1, 80 0 1, 161 192 1, 339 192 1, 250 458 1
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+192 64 0 128 576;64 0 1, 64 576 1, 128 576 1, 128 0 1
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+512 64 0 512 576;64 0 1, 64 576 1, 267 576 1, 365 576 0, 408 565 1, 451 553 0, 478 520 1, 512 479 0, 512 408 1, 512 192 0, 244 192 1, 128 192 1, 128 0 1, 128 256 1, 240 256 1, 448 256 0, 448 402 1, 448 473 0, 394 494 1, 348 512 0, 242 512 1, 128 512 1
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+448 0 0 448 576;192 0 1, 192 512 1, 0 512 1, 0 576 1, 448 576 1, 448 512 1, 256 512 1, 256 0 1
+576 64 0 512 576;64 576 1, 128 576 1, 128 213 1, 128 158 0, 139 132 1, 150 106 0, 180 88 1, 223 64 0, 295 64 1, 379 64 0, 414 97 1, 448 129 0, 448 210 1, 448 576 1, 512 576 1, 512 211 1, 512 139 0, 497 102 1, 482 64 0, 440 37 1, 385 0 0, 292 0 1, 174 0 0, 119 51 1, 64 102 0, 64 214 1
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+448 0 -64 448 0;0 -64 1, 0 0 1, 448 0 1, 448 -64 1
+256 0 512 256 576;216 512 1, 160 512 1, 40 576 1, 125 576 1
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+448 64 -64 384 576;128 249 1, 128 53 1, 182 64 0, 209 64 1, 320 64 0, 320 199 1, 320 256 0, 298 288 1, 276 320 0, 239 320 1, 190 320 0, 128 312 1, 148 344 0, 171 361 1, 204 384 0, 247 384 1, 308 384 0, 346 334 1, 384 285 0, 384 202 1, 384 106 0, 335 53 1, 286 0 0, 197 0 1, 164 0 0, 128 0 1, 64 -5 1, 64 576 1, 128 576 1
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+448 64 0 384 576;320 135 1, 320 331 1, 265 320 0, 239 320 1, 128 320 0, 128 185 1, 128 129 0, 150 96 1, 172 64 0, 209 64 1, 258 64 0, 320 72 1, 300 40 0, 277 23 1, 245 0 0, 201 0 1, 140 0 0, 102 50 1, 64 100 0, 64 182 1, 64 278 0, 113 331 1, 162 384 0, 251 384 1, 285 384 0, 320 384 1, 320 576 1, 384 576 1, 384 0 1, 320 0 1
+448 64 0 448 384;311 256 1, 310 277 0, 303 287 1, 284 320 0, 219 320 1, 173 320 0, 147 305 1, 121 290 0, 115 256 1, 384 72 1, 384 13 1, 314 0 0, 256 0 1, 168 0 0, 116 53 1, 64 107 0, 64 197 1, 64 283 0, 110 333 1, 156 384 0, 234 384 1, 323 384 0, 360 325 1, 387 281 0, 386 212 1, 386 192 1, 114 192 1, 119 153 0, 129 132 1, 162 64 0, 260 64 1, 316 64 0
+192 0 0 256 576;64 0 1, 64 320 1, 0 320 1, 0 384 1, 64 384 1, 64 433 1, 64 576 0, 194 576 1, 221 576 0, 256 569 1, 256 510 1, 219 512 0, 193 512 1, 157 512 0, 142 496 1, 128 481 0, 128 441 1, 128 384 1, 192 384 1, 192 320 1, 128 320 1, 128 0 1
+448 64 -192 384 384;320 153 1, 320 331 1, 265 320 0, 240 320 1, 128 320 0, 128 190 1, 128 132 0, 150 98 1, 172 64 0, 209 64 1, 258 64 0, 320 90 1, 300 50 0, 277 29 1, 245 0 0, 202 0 1, 140 0 0, 102 52 1, 64 103 0, 64 186 1, 64 280 0, 113 332 1, 162 384 0, 250 384 1, 285 384 0, 320 384 1, 384 384 1, 384 105 1, 384 22 0, 374 -18 1, 348 -128 0, 194 -128 1, 130 -128 0, 64 -135 1, 64 -71 1, 143 -64 0, 198 -64 1, 320 -64 0, 320 29 1
+448 64 0 384 576;64 0 1, 64 576 1, 128 576 1, 128 312 1, 157 344 0, 185 360 1, 226 384 0, 275 384 1, 384 384 0, 384 276 1, 384 0 1, 320 0 1, 320 254 1, 320 293 0, 308 306 1, 296 320 0, 264 320 1, 194 320 0, 128 249 1, 128 0 1
+192 64 0 128 576;64 0 1, 64 384 1, 128 384 1, 128 0 1, 64 512 1, 64 576 1, 128 576 1, 128 512 1
+192 -64 -192 128 576;-64 -145 1, -64 -87 1, -28 -64 0, 3 -64 1, 46 -64 0, 56 -47 1, 64 -32 0, 64 0 1, 64 384 1, 128 384 1, 128 0 1, 128 -128 0, 2 -128 1, -33 -128 0, 64 512 1, 64 576 1, 128 576 1, 128 512 1
+384 64 0 384 576;64 0 1, 64 576 1, 128 576 1, 128 198 1, 265 384 1, 335 384 1, 205 203 1, 374 0 1, 284 0 1, 128 197 1, 128 0 1
+192 64 0 128 576;64 0 1, 64 576 1, 128 576 1, 128 0 1
+640 64 0 576 384;64 0 1, 64 384 1, 128 384 1, 128 312 1, 156 353 0, 173 368 1, 194 384 0, 227 384 1, 268 384 0, 294 357 1, 309 342 0, 320 312 1, 357 354 0, 380 368 1, 408 384 0, 453 384 1, 576 384 0, 576 279 1, 576 0 1, 493 0 1, 493 257 1, 493 320 0, 432 320 1, 378 320 0, 320 257 1, 320 0 1, 256 0 1, 256 268 1, 256 320 0, 211 320 1, 171 320 0, 128 257 1, 128 0 1
+448 64 0 384 384;64 0 1, 64 384 1, 128 384 1, 128 312 1, 157 344 0, 185 360 1, 226 384 0, 275 384 1, 384 384 0, 384 276 1, 384 0 1, 320 0 1, 320 253 1, 320 292 0, 308 306 1, 296 320 0, 264 320 1, 194 320 0, 128 249 1, 128 0 1
+448 64 0 384 384;224 384 1, 298 384 0, 341 333 1, 384 281 0, 384 193 1, 384 102 0, 341 51 1, 298 0 0, 222 0 1, 156 0 0, 116 42 1, 64 95 0, 64 192 1, 64 281 0, 107 333 1, 150 384 0, 224 320 1, 128 320 0, 128 192 1, 128 64 0, 224 64 1, 320 64 0, 320 193 1, 320 320 0
+448 64 -128 384 384;128 -128 1, 64 -128 1, 64 384 1, 128 384 1, 128 312 1, 148 344 0, 171 361 1, 203 384 0, 247 384 1, 308 384 0, 346 334 1, 384 285 0, 384 202 1, 384 106 0, 335 53 1, 286 0 0, 197 0 1, 164 0 0, 128 0 1, 128 249 1, 128 53 1, 182 64 0, 209 64 1, 320 64 0, 320 199 1, 320 256 0, 298 288 1, 276 320 0, 239 320 1, 190 320 0
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+384 0 -128 384 576;152 0 1, 7 384 1, 82 384 1, 193 90 1, 314 384 1, 380 384 1, 164 -128 1, 87 -128 1, 67 512 1, 157 576 1, 239 576 1, 329 512 1, 274 512 1, 198 552 1, 198 552 1, 122 512 1
+448 64 0 448 704;64 0 1, 64 64 1, 351 512 1, 64 512 1, 64 576 1, 448 576 1, 448 512 1, 142 64 1, 448 64 1, 448 0 1, 190 576 1, 283 704 1, 370 704 1, 247 576 1
+384 0 0 384 576;0 0 1, 0 64 1, 291 320 1, 64 320 1, 64 384 1, 384 384 1, 384 320 1, 145 64 1, 384 64 1, 384 0 1, 168 512 1, 259 576 1, 344 576 1, 224 512 1
+448 64 0 448 704;64 0 1, 64 64 1, 331 512 1, 64 512 1, 64 576 1, 448 576 1, 448 512 1, 131 64 1, 448 64 1, 448 0 1, 192 640 1, 192 704 1, 256 704 1, 256 640 1
+384 0 0 384 576;0 0 1, 0 64 1, 291 320 1, 64 320 1, 64 384 1, 384 384 1, 384 320 1, 145 64 1, 384 64 1, 384 0 1, 128 512 1, 128 576 1, 192 576 1, 192 512 1
+448 64 0 448 704;64 0 1, 64 64 1, 351 512 1, 64 512 1, 64 576 1, 448 576 1, 448 512 1, 142 64 1, 448 64 1, 448 0 1, 386 704 1, 293 576 1, 209 576 1, 117 704 1, 174 704 1, 251 623 1, 252 623 1, 329 704 1
+384 0 0 384 576;0 0 1, 0 64 1, 291 320 1, 64 320 1, 64 384 1, 384 384 1, 384 320 1, 145 64 1, 384 64 1, 384 0 1, 323 576 1, 233 512 1, 151 512 1, 61 576 1, 116 576 1, 192 536 1, 192 536 1, 268 576 1
+192 0 0 192 640;64 0 1, 64 352 1, 0 352 1, 0 407 1, 64 407 1, 64 456 1, 64 513 0, 91 544 1, 119 576 0, 169 576 1, 176 576 0, 192 600 1, 192 545 1, 181 512 0, 175 512 1, 128 512 0, 128 464 1, 128 0 1
+512 64 -192 512 576;64 21 1, 64 102 1, 189 64 0, 311 64 1, 448 64 0, 448 152 1, 448 197 0, 410 218 1, 381 235 0, 315 253 1, 229 278 1, 64 324 0, 64 431 1, 64 576 0, 267 576 1, 355 576 0, 448 566 1, 448 491 1, 347 512 0, 255 512 1, 128 512 0, 128 431 1, 128 399 0, 154 379 1, 180 359 0, 247 340 1, 334 316 1, 432 288 0, 472 252 1, 512 216 0, 512 157 1, 512 84 0, 454 42 1, 396 0 0, 294 0 1, 193 0 0, 214 -158 1, 214 -126 1, 226 -128 0, 234 -128 1, 256 -128 0, 256 -104 1, 256 -77 0, 233 -71 1, 233 -42 1, 273 -43 0, 292 -57 1, 320 -77 0, 320 -121 1, 320 -192 0, 253 -192 1, 234 -192 0
+384 64 -192 320 384;64 13 1, 64 77 1, 128 64 0, 183 64 1, 256 64 0, 256 116 1, 256 152 0, 204 168 1, 147 187 1, 64 214 0, 64 286 1, 64 384 0, 215 384 1, 258 384 0, 320 381 1, 320 323 1, 263 320 0, 206 320 1, 128 320 0, 128 276 1, 128 244 0, 174 230 1, 225 213 1, 320 182 0, 320 106 1, 320 57 0, 283 29 1, 245 0 0, 180 0 1, 129 0 0, 128 -158 1, 128 -126 1, 146 -128 0, 158 -128 1, 192 -128 0, 192 -104 1, 192 -77 0, 146 -71 1, 146 -42 1, 196 -43 0, 221 -57 1, 256 -77 0, 256 -121 1, 256 -192 0, 175 -192 1, 153 -192 0
+448 0 -192 448 576;192 0 1, 192 512 1, 0 512 1, 0 576 1, 448 576 1, 448 512 1, 256 512 1, 256 0 1, 173 -158 1, 173 -126 1, 196 -128 0, 212 -128 1, 256 -128 0, 256 -104 1, 256 -77 0, 192 -71 1, 192 -42 1, 251 -43 0, 279 -57 1, 320 -77 0, 320 -121 1, 320 -192 0, 227 -192 1, 201 -192 0
+192 0 -192 192 512;192 -2 1, 172 0 0, 154 0 1, 64 0 0, 64 103 1, 64 320 1, 0 320 1, 0 384 1, 64 384 1, 64 458 1, 128 465 1, 128 384 1, 192 384 1, 192 320 1, 128 320 1, 128 115 1, 128 84 0, 136 74 1, 144 64 0, 168 64 1, 182 64 0, 192 45 1, 64 -158 1, 64 -126 1, 82 -128 0, 94 -128 1, 128 -128 0, 128 -104 1, 128 -77 0, 82 -71 1, 82 -42 1, 132 -43 0, 157 -57 1, 192 -77 0, 192 -121 1, 192 -192 0, 111 -192 1, 89 -192 0
+256 64 -192 192 0;64 -158 1, 64 -126 1, 82 -128 0, 94 -128 1, 128 -128 0, 128 -104 1, 128 -77 0, 82 -71 1, 82 -42 1, 132 -43 0, 157 -57 1, 192 -77 0, 192 -121 1, 192 -192 0, 111 -192 1, 89 -192 0
+192 64 -128 128 384;64 -120 1, 64 -93 1, 87 -79 0, 87 -9 1, 87 0 1, 64 0 1, 64 64 1, 128 64 1, 128 10 1, 128 -102 0, 64 320 1, 64 384 1, 128 384 1, 128 320 1
+192 64 192 128 256;64 192 1, 64 256 1, 128 256 1, 128 192 1
+256 64 192 192 256;64 192 1, 64 256 1, 192 256 1, 192 192 1
+256 64 192 192 256;64 192 1, 64 256 1, 192 256 1, 192 192 1
+448 0 192 448 256;38 192 1, 38 256 1, 390 256 1, 390 192 1
+768 0 192 768 256;37 192 1, 37 256 1, 731 256 1, 731 192 1
+192 0 0 0 0;
+448 64 512 384 576;64 512 1, 64 576 1, 384 576 1, 384 512 1
+448 64 0 448 384;311 256 1, 310 277 0, 303 287 1, 284 320 0, 219 320 1, 173 320 0, 147 305 1, 121 290 0, 115 256 1, 384 72 1, 384 13 1, 314 0 0, 256 0 1, 168 0 0, 116 53 1, 64 107 0, 64 197 1, 64 283 0, 110 333 1, 156 384 0, 234 384 1, 323 384 0, 360 325 1, 387 281 0, 386 212 1, 386 192 1, 114 192 1, 119 153 0, 129 132 1, 162 64 0, 260 64 1, 316 64 0
+448 64 192 384 256;64 192 1, 64 256 1, 384 256 1, 384 192 1
+128 -192 -64 320 576;-165 -14 1, 243 569 1, 293 569 1, -114 -14 1
+192 64 192 128 256;64 192 1, 64 256 1, 128 256 1, 128 192 1
+384 0 0 320 640;64 0 1, 64 320 1, 0 320 1, 0 384 1, 64 384 1, 64 468 1, 64 640 0, 194 640 1, 221 640 0, 256 613 1, 256 557 1, 219 576 0, 193 576 1, 157 576 0, 142 555 1, 128 534 0, 128 482 1, 128 384 1, 320 384 1, 320 0 1, 256 0 1, 256 320 1, 128 320 1, 128 0 1, 256 512 1, 256 576 1, 320 576 1, 320 512 1
+384 0 0 320 576;64 0 1, 64 320 1, 0 320 1, 0 384 1, 64 384 1, 64 435 1, 64 576 0, 175 576 1, 256 576 1, 320 576 1, 320 0 1, 256 0 1, 256 518 1, 240 516 1, 206 512 0, 183 512 1, 148 512 0, 137 493 1, 128 477 0, 128 443 1, 128 384 1, 192 384 1, 192 320 1, 128 320 1, 128 0 1
+256 -64 192 256 576;128 229 1, 128 320 1, -25 320 1, -25 382 1, 126 576 1, 192 576 1, 192 384 1, 238 384 1, 238 320 1, 192 320 1, 192 229 1, 24 384 1, 128 384 1, 128 516 1
+192 -64 -192 128 384;-64 -145 1, -64 -87 1, -28 -64 0, 3 -64 1, 46 -64 0, 56 -47 1, 64 -32 0, 64 0 1, 64 384 1, 128 384 1, 128 0 1, 128 -128 0, 2 -128 1, -33 -128 0
+192 0 0 0 0;

vendor/github.com/golang/freetype/testdata/make-other-hinting-txts.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+# This script creates the optional x-*-hinting.txt files from fonts that are
+# not checked in for copyright or file size reasons.
+#
+# Run it from this directory (testdata).
+#
+# It has only been tested on an Ubuntu 14.04 system.
+
+set -e
+
+: ${FONTDIR:=/usr/share/fonts/truetype}
+
+ln -sf $FONTDIR/droid/DroidSansJapanese.ttf       x-droid-sans-japanese.ttf
+ln -sf $FONTDIR/msttcorefonts/Arial_Bold.ttf      x-arial-bold.ttf 
+ln -sf $FONTDIR/msttcorefonts/Times_New_Roman.ttf x-times-new-roman.ttf
+ln -sf $FONTDIR/ttf-dejavu/DejaVuSans-Oblique.ttf x-deja-vu-sans-oblique.ttf
+
+${CC:=gcc} ../cmd/print-glyph-points/main.c $(pkg-config --cflags --libs freetype2) -o print-glyph-points
+
+# Uncomment these lines to also recreate the luxisr-*-hinting.txt files.
+# ./print-glyph-points 12 luxisr.ttf sans_hinting > luxisr-12pt-sans-hinting.txt
+# ./print-glyph-points 12 luxisr.ttf with_hinting > luxisr-12pt-with-hinting.txt
+
+./print-glyph-points  9 x-droid-sans-japanese.ttf sans_hinting  > x-droid-sans-japanese-9pt-sans-hinting.txt
+./print-glyph-points  9 x-droid-sans-japanese.ttf with_hinting  > x-droid-sans-japanese-9pt-with-hinting.txt
+./print-glyph-points 11 x-arial-bold.ttf sans_hinting           > x-arial-bold-11pt-sans-hinting.txt
+./print-glyph-points 11 x-arial-bold.ttf with_hinting           > x-arial-bold-11pt-with-hinting.txt
+./print-glyph-points 13 x-times-new-roman.ttf sans_hinting      > x-times-new-roman-13pt-sans-hinting.txt
+./print-glyph-points 13 x-times-new-roman.ttf with_hinting      > x-times-new-roman-13pt-with-hinting.txt
+./print-glyph-points 17 x-deja-vu-sans-oblique.ttf sans_hinting > x-deja-vu-sans-oblique-17pt-sans-hinting.txt
+./print-glyph-points 17 x-deja-vu-sans-oblique.ttf with_hinting > x-deja-vu-sans-oblique-17pt-with-hinting.txt
+
+rm print-glyph-points

vendor/github.com/golang/freetype/truetype/face.go

@@ -0,0 +1,507 @@
+// Copyright 2015 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+import (
+	"image"
+	"math"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func powerOf2(i int) bool {
+	return i != 0 && (i&(i-1)) == 0
+}
+
+// Options are optional arguments to NewFace.
+type Options struct {
+	// Size is the font size in points, as in "a 10 point font size".
+	//
+	// A zero value means to use a 12 point font size.
+	Size float64
+
+	// DPI is the dots-per-inch resolution.
+	//
+	// A zero value means to use 72 DPI.
+	DPI float64
+
+	// Hinting is how to quantize the glyph nodes.
+	//
+	// A zero value means to use no hinting.
+	Hinting font.Hinting
+
+	// GlyphCacheEntries is the number of entries in the glyph mask image
+	// cache.
+	//
+	// If non-zero, it must be a power of 2.
+	//
+	// A zero value means to use 512 entries.
+	GlyphCacheEntries int
+
+	// SubPixelsX is the number of sub-pixel locations a glyph's dot is
+	// quantized to, in the horizontal direction. For example, a value of 8
+	// means that the dot is quantized to 1/8th of a pixel. This quantization
+	// only affects the glyph mask image, not its bounding box or advance
+	// width. A higher value gives a more faithful glyph image, but reduces the
+	// effectiveness of the glyph cache.
+	//
+	// If non-zero, it must be a power of 2, and be between 1 and 64 inclusive.
+	//
+	// A zero value means to use 4 sub-pixel locations.
+	SubPixelsX int
+
+	// SubPixelsY is the number of sub-pixel locations a glyph's dot is
+	// quantized to, in the vertical direction. For example, a value of 8
+	// means that the dot is quantized to 1/8th of a pixel. This quantization
+	// only affects the glyph mask image, not its bounding box or advance
+	// width. A higher value gives a more faithful glyph image, but reduces the
+	// effectiveness of the glyph cache.
+	//
+	// If non-zero, it must be a power of 2, and be between 1 and 64 inclusive.
+	//
+	// A zero value means to use 1 sub-pixel location.
+	SubPixelsY int
+}
+
+func (o *Options) size() float64 {
+	if o != nil && o.Size > 0 {
+		return o.Size
+	}
+	return 12
+}
+
+func (o *Options) dpi() float64 {
+	if o != nil && o.DPI > 0 {
+		return o.DPI
+	}
+	return 72
+}
+
+func (o *Options) hinting() font.Hinting {
+	if o != nil {
+		switch o.Hinting {
+		case font.HintingVertical, font.HintingFull:
+			// TODO: support vertical hinting.
+			return font.HintingFull
+		}
+	}
+	return font.HintingNone
+}
+
+func (o *Options) glyphCacheEntries() int {
+	if o != nil && powerOf2(o.GlyphCacheEntries) {
+		return o.GlyphCacheEntries
+	}
+	// 512 is 128 * 4 * 1, which lets us cache 128 glyphs at 4 * 1 subpixel
+	// locations in the X and Y direction.
+	return 512
+}
+
+func (o *Options) subPixelsX() (value uint32, halfQuantum, mask fixed.Int26_6) {
+	if o != nil {
+		switch o.SubPixelsX {
+		case 1, 2, 4, 8, 16, 32, 64:
+			return subPixels(o.SubPixelsX)
+		}
+	}
+	// This default value of 4 isn't based on anything scientific, merely as
+	// small a number as possible that looks almost as good as no quantization,
+	// or returning subPixels(64).
+	return subPixels(4)
+}
+
+func (o *Options) subPixelsY() (value uint32, halfQuantum, mask fixed.Int26_6) {
+	if o != nil {
+		switch o.SubPixelsX {
+		case 1, 2, 4, 8, 16, 32, 64:
+			return subPixels(o.SubPixelsX)
+		}
+	}
+	// This default value of 1 isn't based on anything scientific, merely that
+	// vertical sub-pixel glyph rendering is pretty rare. Baseline locations
+	// can usually afford to snap to the pixel grid, so the vertical direction
+	// doesn't have the deal with the horizontal's fractional advance widths.
+	return subPixels(1)
+}
+
+// subPixels returns q and the bias and mask that leads to q quantized
+// sub-pixel locations per full pixel.
+//
+// For example, q == 4 leads to a bias of 8 and a mask of 0xfffffff0, or -16,
+// because we want to round fractions of fixed.Int26_6 as:
+//	-  0 to  7 rounds to 0.
+//	-  8 to 23 rounds to 16.
+//	- 24 to 39 rounds to 32.
+//	- 40 to 55 rounds to 48.
+//	- 56 to 63 rounds to 64.
+// which means to add 8 and then bitwise-and with -16, in two's complement
+// representation.
+//
+// When q ==  1, we want bias == 32 and mask == -64.
+// When q ==  2, we want bias == 16 and mask == -32.
+// When q ==  4, we want bias ==  8 and mask == -16.
+// ...
+// When q == 64, we want bias ==  0 and mask ==  -1. (The no-op case).
+// The pattern is clear.
+func subPixels(q int) (value uint32, bias, mask fixed.Int26_6) {
+	return uint32(q), 32 / fixed.Int26_6(q), -64 / fixed.Int26_6(q)
+}
+
+// glyphCacheEntry caches the arguments and return values of rasterize.
+type glyphCacheEntry struct {
+	key glyphCacheKey
+	val glyphCacheVal
+}
+
+type glyphCacheKey struct {
+	index  Index
+	fx, fy uint8
+}
+
+type glyphCacheVal struct {
+	advanceWidth fixed.Int26_6
+	offset       image.Point
+	gw           int
+	gh           int
+}
+
+type indexCacheEntry struct {
+	rune  rune
+	index Index
+}
+
+// NewFace returns a new font.Face for the given Font.
+func NewFace(f *Font, opts *Options) font.Face {
+	a := &face{
+		f:          f,
+		hinting:    opts.hinting(),
+		scale:      fixed.Int26_6(0.5 + (opts.size() * opts.dpi() * 64 / 72)),
+		glyphCache: make([]glyphCacheEntry, opts.glyphCacheEntries()),
+	}
+	a.subPixelX, a.subPixelBiasX, a.subPixelMaskX = opts.subPixelsX()
+	a.subPixelY, a.subPixelBiasY, a.subPixelMaskY = opts.subPixelsY()
+
+	// Fill the cache with invalid entries. Valid glyph cache entries have fx
+	// and fy in the range [0, 64). Valid index cache entries have rune >= 0.
+	for i := range a.glyphCache {
+		a.glyphCache[i].key.fy = 0xff
+	}
+	for i := range a.indexCache {
+		a.indexCache[i].rune = -1
+	}
+
+	// Set the rasterizer's bounds to be big enough to handle the largest glyph.
+	b := f.Bounds(a.scale)
+	xmin := +int(b.Min.X) >> 6
+	ymin := -int(b.Max.Y) >> 6
+	xmax := +int(b.Max.X+63) >> 6
+	ymax := -int(b.Min.Y-63) >> 6
+	a.maxw = xmax - xmin
+	a.maxh = ymax - ymin
+	a.masks = image.NewAlpha(image.Rect(0, 0, a.maxw, a.maxh*len(a.glyphCache)))
+	a.r.SetBounds(a.maxw, a.maxh)
+	a.p = facePainter{a}
+
+	return a
+}
+
+type face struct {
+	f             *Font
+	hinting       font.Hinting
+	scale         fixed.Int26_6
+	subPixelX     uint32
+	subPixelBiasX fixed.Int26_6
+	subPixelMaskX fixed.Int26_6
+	subPixelY     uint32
+	subPixelBiasY fixed.Int26_6
+	subPixelMaskY fixed.Int26_6
+	masks         *image.Alpha
+	glyphCache    []glyphCacheEntry
+	r             raster.Rasterizer
+	p             raster.Painter
+	paintOffset   int
+	maxw          int
+	maxh          int
+	glyphBuf      GlyphBuf
+	indexCache    [indexCacheLen]indexCacheEntry
+
+	// TODO: clip rectangle?
+}
+
+const indexCacheLen = 256
+
+func (a *face) index(r rune) Index {
+	const mask = indexCacheLen - 1
+	c := &a.indexCache[r&mask]
+	if c.rune == r {
+		return c.index
+	}
+	i := a.f.Index(r)
+	c.rune = r
+	c.index = i
+	return i
+}
+
+// Close satisfies the font.Face interface.
+func (a *face) Close() error { return nil }
+
+// Metrics satisfies the font.Face interface.
+func (a *face) Metrics() font.Metrics {
+	scale := float64(a.scale)
+	fupe := float64(a.f.FUnitsPerEm())
+	return font.Metrics{
+		Height:  a.scale,
+		Ascent:  fixed.Int26_6(math.Ceil(scale * float64(+a.f.ascent) / fupe)),
+		Descent: fixed.Int26_6(math.Ceil(scale * float64(-a.f.descent) / fupe)),
+	}
+}
+
+// Kern satisfies the font.Face interface.
+func (a *face) Kern(r0, r1 rune) fixed.Int26_6 {
+	i0 := a.index(r0)
+	i1 := a.index(r1)
+	kern := a.f.Kern(a.scale, i0, i1)
+	if a.hinting != font.HintingNone {
+		kern = (kern + 32) &^ 63
+	}
+	return kern
+}
+
+// Glyph satisfies the font.Face interface.
+func (a *face) Glyph(dot fixed.Point26_6, r rune) (
+	dr image.Rectangle, mask image.Image, maskp image.Point, advance fixed.Int26_6, ok bool) {
+
+	// Quantize to the sub-pixel granularity.
+	dotX := (dot.X + a.subPixelBiasX) & a.subPixelMaskX
+	dotY := (dot.Y + a.subPixelBiasY) & a.subPixelMaskY
+
+	// Split the coordinates into their integer and fractional parts.
+	ix, fx := int(dotX>>6), dotX&0x3f
+	iy, fy := int(dotY>>6), dotY&0x3f
+
+	index := a.index(r)
+	cIndex := uint32(index)
+	cIndex = cIndex*a.subPixelX - uint32(fx/a.subPixelMaskX)
+	cIndex = cIndex*a.subPixelY - uint32(fy/a.subPixelMaskY)
+	cIndex &= uint32(len(a.glyphCache) - 1)
+	a.paintOffset = a.maxh * int(cIndex)
+	k := glyphCacheKey{
+		index: index,
+		fx:    uint8(fx),
+		fy:    uint8(fy),
+	}
+	var v glyphCacheVal
+	if a.glyphCache[cIndex].key != k {
+		var ok bool
+		v, ok = a.rasterize(index, fx, fy)
+		if !ok {
+			return image.Rectangle{}, nil, image.Point{}, 0, false
+		}
+		a.glyphCache[cIndex] = glyphCacheEntry{k, v}
+	} else {
+		v = a.glyphCache[cIndex].val
+	}
+
+	dr.Min = image.Point{
+		X: ix + v.offset.X,
+		Y: iy + v.offset.Y,
+	}
+	dr.Max = image.Point{
+		X: dr.Min.X + v.gw,
+		Y: dr.Min.Y + v.gh,
+	}
+	return dr, a.masks, image.Point{Y: a.paintOffset}, v.advanceWidth, true
+}
+
+func (a *face) GlyphBounds(r rune) (bounds fixed.Rectangle26_6, advance fixed.Int26_6, ok bool) {
+	if err := a.glyphBuf.Load(a.f, a.scale, a.index(r), a.hinting); err != nil {
+		return fixed.Rectangle26_6{}, 0, false
+	}
+	xmin := +a.glyphBuf.Bounds.Min.X
+	ymin := -a.glyphBuf.Bounds.Max.Y
+	xmax := +a.glyphBuf.Bounds.Max.X
+	ymax := -a.glyphBuf.Bounds.Min.Y
+	if xmin > xmax || ymin > ymax {
+		return fixed.Rectangle26_6{}, 0, false
+	}
+	return fixed.Rectangle26_6{
+		Min: fixed.Point26_6{
+			X: xmin,
+			Y: ymin,
+		},
+		Max: fixed.Point26_6{
+			X: xmax,
+			Y: ymax,
+		},
+	}, a.glyphBuf.AdvanceWidth, true
+}
+
+func (a *face) GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool) {
+	if err := a.glyphBuf.Load(a.f, a.scale, a.index(r), a.hinting); err != nil {
+		return 0, false
+	}
+	return a.glyphBuf.AdvanceWidth, true
+}
+
+// rasterize returns the advance width, integer-pixel offset to render at, and
+// the width and height of the given glyph at the given sub-pixel offsets.
+//
+// The 26.6 fixed point arguments fx and fy must be in the range [0, 1).
+func (a *face) rasterize(index Index, fx, fy fixed.Int26_6) (v glyphCacheVal, ok bool) {
+	if err := a.glyphBuf.Load(a.f, a.scale, index, a.hinting); err != nil {
+		return glyphCacheVal{}, false
+	}
+	// Calculate the integer-pixel bounds for the glyph.
+	xmin := int(fx+a.glyphBuf.Bounds.Min.X) >> 6
+	ymin := int(fy-a.glyphBuf.Bounds.Max.Y) >> 6
+	xmax := int(fx+a.glyphBuf.Bounds.Max.X+0x3f) >> 6
+	ymax := int(fy-a.glyphBuf.Bounds.Min.Y+0x3f) >> 6
+	if xmin > xmax || ymin > ymax {
+		return glyphCacheVal{}, false
+	}
+	// A TrueType's glyph's nodes can have negative co-ordinates, but the
+	// rasterizer clips anything left of x=0 or above y=0. xmin and ymin are
+	// the pixel offsets, based on the font's FUnit metrics, that let a
+	// negative co-ordinate in TrueType space be non-negative in rasterizer
+	// space. xmin and ymin are typically <= 0.
+	fx -= fixed.Int26_6(xmin << 6)
+	fy -= fixed.Int26_6(ymin << 6)
+	// Rasterize the glyph's vectors.
+	a.r.Clear()
+	pixOffset := a.paintOffset * a.maxw
+	clear(a.masks.Pix[pixOffset : pixOffset+a.maxw*a.maxh])
+	e0 := 0
+	for _, e1 := range a.glyphBuf.Ends {
+		a.drawContour(a.glyphBuf.Points[e0:e1], fx, fy)
+		e0 = e1
+	}
+	a.r.Rasterize(a.p)
+	return glyphCacheVal{
+		a.glyphBuf.AdvanceWidth,
+		image.Point{xmin, ymin},
+		xmax - xmin,
+		ymax - ymin,
+	}, true
+}
+
+func clear(pix []byte) {
+	for i := range pix {
+		pix[i] = 0
+	}
+}
+
+// drawContour draws the given closed contour with the given offset.
+func (a *face) drawContour(ps []Point, dx, dy fixed.Int26_6) {
+	if len(ps) == 0 {
+		return
+	}
+
+	// The low bit of each point's Flags value is whether the point is on the
+	// curve. Truetype fonts only have quadratic Bézier curves, not cubics.
+	// Thus, two consecutive off-curve points imply an on-curve point in the
+	// middle of those two.
+	//
+	// See http://chanae.walon.org/pub/ttf/ttf_glyphs.htm for more details.
+
+	// ps[0] is a truetype.Point measured in FUnits and positive Y going
+	// upwards. start is the same thing measured in fixed point units and
+	// positive Y going downwards, and offset by (dx, dy).
+	start := fixed.Point26_6{
+		X: dx + ps[0].X,
+		Y: dy - ps[0].Y,
+	}
+	var others []Point
+	if ps[0].Flags&0x01 != 0 {
+		others = ps[1:]
+	} else {
+		last := fixed.Point26_6{
+			X: dx + ps[len(ps)-1].X,
+			Y: dy - ps[len(ps)-1].Y,
+		}
+		if ps[len(ps)-1].Flags&0x01 != 0 {
+			start = last
+			others = ps[:len(ps)-1]
+		} else {
+			start = fixed.Point26_6{
+				X: (start.X + last.X) / 2,
+				Y: (start.Y + last.Y) / 2,
+			}
+			others = ps
+		}
+	}
+	a.r.Start(start)
+	q0, on0 := start, true
+	for _, p := range others {
+		q := fixed.Point26_6{
+			X: dx + p.X,
+			Y: dy - p.Y,
+		}
+		on := p.Flags&0x01 != 0
+		if on {
+			if on0 {
+				a.r.Add1(q)
+			} else {
+				a.r.Add2(q0, q)
+			}
+		} else {
+			if on0 {
+				// No-op.
+			} else {
+				mid := fixed.Point26_6{
+					X: (q0.X + q.X) / 2,
+					Y: (q0.Y + q.Y) / 2,
+				}
+				a.r.Add2(q0, mid)
+			}
+		}
+		q0, on0 = q, on
+	}
+	// Close the curve.
+	if on0 {
+		a.r.Add1(start)
+	} else {
+		a.r.Add2(q0, start)
+	}
+}
+
+// facePainter is like a raster.AlphaSrcPainter, with an additional Y offset
+// (face.paintOffset) to the painted spans.
+type facePainter struct {
+	a *face
+}
+
+func (p facePainter) Paint(ss []raster.Span, done bool) {
+	m := p.a.masks
+	b := m.Bounds()
+	b.Min.Y = p.a.paintOffset
+	b.Max.Y = p.a.paintOffset + p.a.maxh
+	for _, s := range ss {
+		s.Y += p.a.paintOffset
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		base := (s.Y-m.Rect.Min.Y)*m.Stride - m.Rect.Min.X
+		p := m.Pix[base+s.X0 : base+s.X1]
+		color := uint8(s.Alpha >> 8)
+		for i := range p {
+			p[i] = color
+		}
+	}
+}

vendor/github.com/golang/freetype/truetype/face_test.go

@@ -0,0 +1,48 @@
+// Copyright 2015 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+import (
+	"image"
+	"image/draw"
+	"io/ioutil"
+	"strings"
+	"testing"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func BenchmarkDrawString(b *testing.B) {
+	data, err := ioutil.ReadFile("../licenses/gpl.txt")
+	if err != nil {
+		b.Fatal(err)
+	}
+	lines := strings.Split(string(data), "\n")
+	data, err = ioutil.ReadFile("../testdata/luxisr.ttf")
+	if err != nil {
+		b.Fatal(err)
+	}
+	f, err := Parse(data)
+	if err != nil {
+		b.Fatal(err)
+	}
+	dst := image.NewRGBA(image.Rect(0, 0, 800, 600))
+	draw.Draw(dst, dst.Bounds(), image.White, image.ZP, draw.Src)
+	d := &font.Drawer{
+		Dst:  dst,
+		Src:  image.Black,
+		Face: NewFace(f, nil),
+	}
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for j, line := range lines {
+			d.Dot = fixed.P(0, (j*16)%600)
+			d.DrawString(line)
+		}
+	}
+}

vendor/github.com/golang/freetype/truetype/glyph.go

@@ -0,0 +1,522 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+import (
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+// TODO: implement VerticalHinting.
+
+// A Point is a co-ordinate pair plus whether it is 'on' a contour or an 'off'
+// control point.
+type Point struct {
+	X, Y fixed.Int26_6
+	// The Flags' LSB means whether or not this Point is 'on' the contour.
+	// Other bits are reserved for internal use.
+	Flags uint32
+}
+
+// A GlyphBuf holds a glyph's contours. A GlyphBuf can be re-used to load a
+// series of glyphs from a Font.
+type GlyphBuf struct {
+	// AdvanceWidth is the glyph's advance width.
+	AdvanceWidth fixed.Int26_6
+	// Bounds is the glyph's bounding box.
+	Bounds fixed.Rectangle26_6
+	// Points contains all Points from all contours of the glyph. If hinting
+	// was used to load a glyph then Unhinted contains those Points before they
+	// were hinted, and InFontUnits contains those Points before they were
+	// hinted and scaled.
+	Points, Unhinted, InFontUnits []Point
+	// Ends is the point indexes of the end point of each contour. The length
+	// of Ends is the number of contours in the glyph. The i'th contour
+	// consists of points Points[Ends[i-1]:Ends[i]], where Ends[-1] is
+	// interpreted to mean zero.
+	Ends []int
+
+	font    *Font
+	scale   fixed.Int26_6
+	hinting font.Hinting
+	hinter  hinter
+	// phantomPoints are the co-ordinates of the synthetic phantom points
+	// used for hinting and bounding box calculations.
+	phantomPoints [4]Point
+	// pp1x is the X co-ordinate of the first phantom point. The '1' is
+	// using 1-based indexing; pp1x is almost always phantomPoints[0].X.
+	// TODO: eliminate this and consistently use phantomPoints[0].X.
+	pp1x fixed.Int26_6
+	// metricsSet is whether the glyph's metrics have been set yet. For a
+	// compound glyph, a sub-glyph may override the outer glyph's metrics.
+	metricsSet bool
+	// tmp is a scratch buffer.
+	tmp []Point
+}
+
+// Flags for decoding a glyph's contours. These flags are documented at
+// http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html.
+const (
+	flagOnCurve = 1 << iota
+	flagXShortVector
+	flagYShortVector
+	flagRepeat
+	flagPositiveXShortVector
+	flagPositiveYShortVector
+
+	// The remaining flags are for internal use.
+	flagTouchedX
+	flagTouchedY
+)
+
+// The same flag bits (0x10 and 0x20) are overloaded to have two meanings,
+// dependent on the value of the flag{X,Y}ShortVector bits.
+const (
+	flagThisXIsSame = flagPositiveXShortVector
+	flagThisYIsSame = flagPositiveYShortVector
+)
+
+// Load loads a glyph's contours from a Font, overwriting any previously loaded
+// contours for this GlyphBuf. scale is the number of 26.6 fixed point units in
+// 1 em, i is the glyph index, and h is the hinting policy.
+func (g *GlyphBuf) Load(f *Font, scale fixed.Int26_6, i Index, h font.Hinting) error {
+	g.Points = g.Points[:0]
+	g.Unhinted = g.Unhinted[:0]
+	g.InFontUnits = g.InFontUnits[:0]
+	g.Ends = g.Ends[:0]
+	g.font = f
+	g.hinting = h
+	g.scale = scale
+	g.pp1x = 0
+	g.phantomPoints = [4]Point{}
+	g.metricsSet = false
+
+	if h != font.HintingNone {
+		if err := g.hinter.init(f, scale); err != nil {
+			return err
+		}
+	}
+	if err := g.load(0, i, true); err != nil {
+		return err
+	}
+	// TODO: this selection of either g.pp1x or g.phantomPoints[0].X isn't ideal,
+	// and should be cleaned up once we have all the testScaling tests passing,
+	// plus additional tests for Freetype-Go's bounding boxes matching C Freetype's.
+	pp1x := g.pp1x
+	if h != font.HintingNone {
+		pp1x = g.phantomPoints[0].X
+	}
+	if pp1x != 0 {
+		for i := range g.Points {
+			g.Points[i].X -= pp1x
+		}
+	}
+
+	advanceWidth := g.phantomPoints[1].X - g.phantomPoints[0].X
+	if h != font.HintingNone {
+		if len(f.hdmx) >= 8 {
+			if n := u32(f.hdmx, 4); n > 3+uint32(i) {
+				for hdmx := f.hdmx[8:]; uint32(len(hdmx)) >= n; hdmx = hdmx[n:] {
+					if fixed.Int26_6(hdmx[0]) == scale>>6 {
+						advanceWidth = fixed.Int26_6(hdmx[2+i]) << 6
+						break
+					}
+				}
+			}
+		}
+		advanceWidth = (advanceWidth + 32) &^ 63
+	}
+	g.AdvanceWidth = advanceWidth
+
+	// Set g.Bounds to the 'control box', which is the bounding box of the
+	// Bézier curves' control points. This is easier to calculate, no smaller
+	// than and often equal to the tightest possible bounding box of the curves
+	// themselves. This approach is what C Freetype does. We can't just scale
+	// the nominal bounding box in the glyf data as the hinting process and
+	// phantom point adjustment may move points outside of that box.
+	if len(g.Points) == 0 {
+		g.Bounds = fixed.Rectangle26_6{}
+	} else {
+		p := g.Points[0]
+		g.Bounds.Min.X = p.X
+		g.Bounds.Max.X = p.X
+		g.Bounds.Min.Y = p.Y
+		g.Bounds.Max.Y = p.Y
+		for _, p := range g.Points[1:] {
+			if g.Bounds.Min.X > p.X {
+				g.Bounds.Min.X = p.X
+			} else if g.Bounds.Max.X < p.X {
+				g.Bounds.Max.X = p.X
+			}
+			if g.Bounds.Min.Y > p.Y {
+				g.Bounds.Min.Y = p.Y
+			} else if g.Bounds.Max.Y < p.Y {
+				g.Bounds.Max.Y = p.Y
+			}
+		}
+		// Snap the box to the grid, if hinting is on.
+		if h != font.HintingNone {
+			g.Bounds.Min.X &^= 63
+			g.Bounds.Min.Y &^= 63
+			g.Bounds.Max.X += 63
+			g.Bounds.Max.X &^= 63
+			g.Bounds.Max.Y += 63
+			g.Bounds.Max.Y &^= 63
+		}
+	}
+	return nil
+}
+
+func (g *GlyphBuf) load(recursion uint32, i Index, useMyMetrics bool) (err error) {
+	// The recursion limit here is arbitrary, but defends against malformed glyphs.
+	if recursion >= 32 {
+		return UnsupportedError("excessive compound glyph recursion")
+	}
+	// Find the relevant slice of g.font.glyf.
+	var g0, g1 uint32
+	if g.font.locaOffsetFormat == locaOffsetFormatShort {
+		g0 = 2 * uint32(u16(g.font.loca, 2*int(i)))
+		g1 = 2 * uint32(u16(g.font.loca, 2*int(i)+2))
+	} else {
+		g0 = u32(g.font.loca, 4*int(i))
+		g1 = u32(g.font.loca, 4*int(i)+4)
+	}
+
+	// Decode the contour count and nominal bounding box, from the first
+	// 10 bytes of the glyf data. boundsYMin and boundsXMax, at offsets 4
+	// and 6, are unused.
+	glyf, ne, boundsXMin, boundsYMax := []byte(nil), 0, fixed.Int26_6(0), fixed.Int26_6(0)
+	if g0+10 <= g1 {
+		glyf = g.font.glyf[g0:g1]
+		ne = int(int16(u16(glyf, 0)))
+		boundsXMin = fixed.Int26_6(int16(u16(glyf, 2)))
+		boundsYMax = fixed.Int26_6(int16(u16(glyf, 8)))
+	}
+
+	// Create the phantom points.
+	uhm, pp1x := g.font.unscaledHMetric(i), fixed.Int26_6(0)
+	uvm := g.font.unscaledVMetric(i, boundsYMax)
+	g.phantomPoints = [4]Point{
+		{X: boundsXMin - uhm.LeftSideBearing},
+		{X: boundsXMin - uhm.LeftSideBearing + uhm.AdvanceWidth},
+		{X: uhm.AdvanceWidth / 2, Y: boundsYMax + uvm.TopSideBearing},
+		{X: uhm.AdvanceWidth / 2, Y: boundsYMax + uvm.TopSideBearing - uvm.AdvanceHeight},
+	}
+	if len(glyf) == 0 {
+		g.addPhantomsAndScale(len(g.Points), len(g.Points), true, true)
+		copy(g.phantomPoints[:], g.Points[len(g.Points)-4:])
+		g.Points = g.Points[:len(g.Points)-4]
+		// TODO: also trim g.InFontUnits and g.Unhinted?
+		return nil
+	}
+
+	// Load and hint the contours.
+	if ne < 0 {
+		if ne != -1 {
+			// http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html says that
+			// "the values -2, -3, and so forth, are reserved for future use."
+			return UnsupportedError("negative number of contours")
+		}
+		pp1x = g.font.scale(g.scale * (boundsXMin - uhm.LeftSideBearing))
+		if err := g.loadCompound(recursion, uhm, i, glyf, useMyMetrics); err != nil {
+			return err
+		}
+	} else {
+		np0, ne0 := len(g.Points), len(g.Ends)
+		program := g.loadSimple(glyf, ne)
+		g.addPhantomsAndScale(np0, np0, true, true)
+		pp1x = g.Points[len(g.Points)-4].X
+		if g.hinting != font.HintingNone {
+			if len(program) != 0 {
+				err := g.hinter.run(
+					program,
+					g.Points[np0:],
+					g.Unhinted[np0:],
+					g.InFontUnits[np0:],
+					g.Ends[ne0:],
+				)
+				if err != nil {
+					return err
+				}
+			}
+			// Drop the four phantom points.
+			g.InFontUnits = g.InFontUnits[:len(g.InFontUnits)-4]
+			g.Unhinted = g.Unhinted[:len(g.Unhinted)-4]
+		}
+		if useMyMetrics {
+			copy(g.phantomPoints[:], g.Points[len(g.Points)-4:])
+		}
+		g.Points = g.Points[:len(g.Points)-4]
+		if np0 != 0 {
+			// The hinting program expects the []Ends values to be indexed
+			// relative to the inner glyph, not the outer glyph, so we delay
+			// adding np0 until after the hinting program (if any) has run.
+			for i := ne0; i < len(g.Ends); i++ {
+				g.Ends[i] += np0
+			}
+		}
+	}
+	if useMyMetrics && !g.metricsSet {
+		g.metricsSet = true
+		g.pp1x = pp1x
+	}
+	return nil
+}
+
+// loadOffset is the initial offset for loadSimple and loadCompound. The first
+// 10 bytes are the number of contours and the bounding box.
+const loadOffset = 10
+
+func (g *GlyphBuf) loadSimple(glyf []byte, ne int) (program []byte) {
+	offset := loadOffset
+	for i := 0; i < ne; i++ {
+		g.Ends = append(g.Ends, 1+int(u16(glyf, offset)))
+		offset += 2
+	}
+
+	// Note the TrueType hinting instructions.
+	instrLen := int(u16(glyf, offset))
+	offset += 2
+	program = glyf[offset : offset+instrLen]
+	offset += instrLen
+
+	if ne == 0 {
+		return program
+	}
+
+	np0 := len(g.Points)
+	np1 := np0 + int(g.Ends[len(g.Ends)-1])
+
+	// Decode the flags.
+	for i := np0; i < np1; {
+		c := uint32(glyf[offset])
+		offset++
+		g.Points = append(g.Points, Point{Flags: c})
+		i++
+		if c&flagRepeat != 0 {
+			count := glyf[offset]
+			offset++
+			for ; count > 0; count-- {
+				g.Points = append(g.Points, Point{Flags: c})
+				i++
+			}
+		}
+	}
+
+	// Decode the co-ordinates.
+	var x int16
+	for i := np0; i < np1; i++ {
+		f := g.Points[i].Flags
+		if f&flagXShortVector != 0 {
+			dx := int16(glyf[offset])
+			offset++
+			if f&flagPositiveXShortVector == 0 {
+				x -= dx
+			} else {
+				x += dx
+			}
+		} else if f&flagThisXIsSame == 0 {
+			x += int16(u16(glyf, offset))
+			offset += 2
+		}
+		g.Points[i].X = fixed.Int26_6(x)
+	}
+	var y int16
+	for i := np0; i < np1; i++ {
+		f := g.Points[i].Flags
+		if f&flagYShortVector != 0 {
+			dy := int16(glyf[offset])
+			offset++
+			if f&flagPositiveYShortVector == 0 {
+				y -= dy
+			} else {
+				y += dy
+			}
+		} else if f&flagThisYIsSame == 0 {
+			y += int16(u16(glyf, offset))
+			offset += 2
+		}
+		g.Points[i].Y = fixed.Int26_6(y)
+	}
+
+	return program
+}
+
+func (g *GlyphBuf) loadCompound(recursion uint32, uhm HMetric, i Index,
+	glyf []byte, useMyMetrics bool) error {
+
+	// Flags for decoding a compound glyph. These flags are documented at
+	// http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html.
+	const (
+		flagArg1And2AreWords = 1 << iota
+		flagArgsAreXYValues
+		flagRoundXYToGrid
+		flagWeHaveAScale
+		flagUnused
+		flagMoreComponents
+		flagWeHaveAnXAndYScale
+		flagWeHaveATwoByTwo
+		flagWeHaveInstructions
+		flagUseMyMetrics
+		flagOverlapCompound
+	)
+	np0, ne0 := len(g.Points), len(g.Ends)
+	offset := loadOffset
+	for {
+		flags := u16(glyf, offset)
+		component := Index(u16(glyf, offset+2))
+		dx, dy, transform, hasTransform := fixed.Int26_6(0), fixed.Int26_6(0), [4]int16{}, false
+		if flags&flagArg1And2AreWords != 0 {
+			dx = fixed.Int26_6(int16(u16(glyf, offset+4)))
+			dy = fixed.Int26_6(int16(u16(glyf, offset+6)))
+			offset += 8
+		} else {
+			dx = fixed.Int26_6(int16(int8(glyf[offset+4])))
+			dy = fixed.Int26_6(int16(int8(glyf[offset+5])))
+			offset += 6
+		}
+		if flags&flagArgsAreXYValues == 0 {
+			return UnsupportedError("compound glyph transform vector")
+		}
+		if flags&(flagWeHaveAScale|flagWeHaveAnXAndYScale|flagWeHaveATwoByTwo) != 0 {
+			hasTransform = true
+			switch {
+			case flags&flagWeHaveAScale != 0:
+				transform[0] = int16(u16(glyf, offset+0))
+				transform[3] = transform[0]
+				offset += 2
+			case flags&flagWeHaveAnXAndYScale != 0:
+				transform[0] = int16(u16(glyf, offset+0))
+				transform[3] = int16(u16(glyf, offset+2))
+				offset += 4
+			case flags&flagWeHaveATwoByTwo != 0:
+				transform[0] = int16(u16(glyf, offset+0))
+				transform[1] = int16(u16(glyf, offset+2))
+				transform[2] = int16(u16(glyf, offset+4))
+				transform[3] = int16(u16(glyf, offset+6))
+				offset += 8
+			}
+		}
+		savedPP := g.phantomPoints
+		np0 := len(g.Points)
+		componentUMM := useMyMetrics && (flags&flagUseMyMetrics != 0)
+		if err := g.load(recursion+1, component, componentUMM); err != nil {
+			return err
+		}
+		if flags&flagUseMyMetrics == 0 {
+			g.phantomPoints = savedPP
+		}
+		if hasTransform {
+			for j := np0; j < len(g.Points); j++ {
+				p := &g.Points[j]
+				newX := 0 +
+					fixed.Int26_6((int64(p.X)*int64(transform[0])+1<<13)>>14) +
+					fixed.Int26_6((int64(p.Y)*int64(transform[2])+1<<13)>>14)
+				newY := 0 +
+					fixed.Int26_6((int64(p.X)*int64(transform[1])+1<<13)>>14) +
+					fixed.Int26_6((int64(p.Y)*int64(transform[3])+1<<13)>>14)
+				p.X, p.Y = newX, newY
+			}
+		}
+		dx = g.font.scale(g.scale * dx)
+		dy = g.font.scale(g.scale * dy)
+		if flags&flagRoundXYToGrid != 0 {
+			dx = (dx + 32) &^ 63
+			dy = (dy + 32) &^ 63
+		}
+		for j := np0; j < len(g.Points); j++ {
+			p := &g.Points[j]
+			p.X += dx
+			p.Y += dy
+		}
+		// TODO: also adjust g.InFontUnits and g.Unhinted?
+		if flags&flagMoreComponents == 0 {
+			break
+		}
+	}
+
+	instrLen := 0
+	if g.hinting != font.HintingNone && offset+2 <= len(glyf) {
+		instrLen = int(u16(glyf, offset))
+		offset += 2
+	}
+
+	g.addPhantomsAndScale(np0, len(g.Points), false, instrLen > 0)
+	points, ends := g.Points[np0:], g.Ends[ne0:]
+	g.Points = g.Points[:len(g.Points)-4]
+	for j := range points {
+		points[j].Flags &^= flagTouchedX | flagTouchedY
+	}
+
+	if instrLen == 0 {
+		if !g.metricsSet {
+			copy(g.phantomPoints[:], points[len(points)-4:])
+		}
+		return nil
+	}
+
+	// Hint the compound glyph.
+	program := glyf[offset : offset+instrLen]
+	// Temporarily adjust the ends to be relative to this compound glyph.
+	if np0 != 0 {
+		for i := range ends {
+			ends[i] -= np0
+		}
+	}
+	// Hinting instructions of a composite glyph completely refer to the
+	// (already) hinted subglyphs.
+	g.tmp = append(g.tmp[:0], points...)
+	if err := g.hinter.run(program, points, g.tmp, g.tmp, ends); err != nil {
+		return err
+	}
+	if np0 != 0 {
+		for i := range ends {
+			ends[i] += np0
+		}
+	}
+	if !g.metricsSet {
+		copy(g.phantomPoints[:], points[len(points)-4:])
+	}
+	return nil
+}
+
+func (g *GlyphBuf) addPhantomsAndScale(np0, np1 int, simple, adjust bool) {
+	// Add the four phantom points.
+	g.Points = append(g.Points, g.phantomPoints[:]...)
+	// Scale the points.
+	if simple && g.hinting != font.HintingNone {
+		g.InFontUnits = append(g.InFontUnits, g.Points[np1:]...)
+	}
+	for i := np1; i < len(g.Points); i++ {
+		p := &g.Points[i]
+		p.X = g.font.scale(g.scale * p.X)
+		p.Y = g.font.scale(g.scale * p.Y)
+	}
+	if g.hinting == font.HintingNone {
+		return
+	}
+	// Round the 1st phantom point to the grid, shifting all other points equally.
+	// Note that "all other points" starts from np0, not np1.
+	// TODO: delete this adjustment and the np0/np1 distinction, when
+	// we update the compatibility tests to C Freetype 2.5.3.
+	// See http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=05c786d990390a7ca18e62962641dac740bacb06
+	if adjust {
+		pp1x := g.Points[len(g.Points)-4].X
+		if dx := ((pp1x + 32) &^ 63) - pp1x; dx != 0 {
+			for i := np0; i < len(g.Points); i++ {
+				g.Points[i].X += dx
+			}
+		}
+	}
+	if simple {
+		g.Unhinted = append(g.Unhinted, g.Points[np1:]...)
+	}
+	// Round the 2nd and 4th phantom point to the grid.
+	p := &g.Points[len(g.Points)-3]
+	p.X = (p.X + 32) &^ 63
+	p = &g.Points[len(g.Points)-1]
+	p.Y = (p.Y + 32) &^ 63
+}

vendor/github.com/golang/freetype/truetype/hint_test.go

@@ -0,0 +1,675 @@
+// Copyright 2012 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+
+	"golang.org/x/image/math/fixed"
+)
+
+func TestBytecode(t *testing.T) {
+	testCases := []struct {
+		desc   string
+		prog   []byte
+		want   []int32
+		errStr string
+	}{
+		{
+			"underflow",
+			[]byte{
+				opDUP,
+			},
+			nil,
+			"underflow",
+		},
+		{
+			"infinite loop",
+			[]byte{
+				opPUSHW000, // [-1]
+				0xff,
+				0xff,
+				opDUP,  // [-1, -1]
+				opJMPR, // [-1]
+			},
+			nil,
+			"too many steps",
+		},
+		{
+			"unbalanced if/else",
+			[]byte{
+				opPUSHB000, // [0]
+				0,
+				opIF,
+			},
+			nil,
+			"unbalanced",
+		},
+		{
+			"vector set/gets",
+			[]byte{
+				opSVTCA1,   // []
+				opGPV,      // [0x4000, 0]
+				opSVTCA0,   // [0x4000, 0]
+				opGFV,      // [0x4000, 0, 0, 0x4000]
+				opNEG,      // [0x4000, 0, 0, -0x4000]
+				opSPVFS,    // [0x4000, 0]
+				opSFVTPV,   // [0x4000, 0]
+				opPUSHB000, // [0x4000, 0, 1]
+				1,
+				opGFV,      // [0x4000, 0, 1, 0, -0x4000]
+				opPUSHB000, // [0x4000, 0, 1, 0, -0x4000, 2]
+				2,
+			},
+			[]int32{0x4000, 0, 1, 0, -0x4000, 2},
+			"",
+		},
+		{
+			"jumps",
+			[]byte{
+				opPUSHB001, // [10, 2]
+				10,
+				2,
+				opJMPR,     // [10]
+				opDUP,      // not executed
+				opDUP,      // [10, 10]
+				opPUSHB010, // [10, 10, 20, 2, 1]
+				20,
+				2,
+				1,
+				opJROT,     // [10, 10, 20]
+				opDUP,      // not executed
+				opDUP,      // [10, 10, 20, 20]
+				opPUSHB010, // [10, 10, 20, 20, 30, 2, 1]
+				30,
+				2,
+				1,
+				opJROF, // [10, 10, 20, 20, 30]
+				opDUP,  // [10, 10, 20, 20, 30, 30]
+				opDUP,  // [10, 10, 20, 20, 30, 30, 30]
+			},
+			[]int32{10, 10, 20, 20, 30, 30, 30},
+			"",
+		},
+		{
+			"stack ops",
+			[]byte{
+				opPUSHB010, // [10, 20, 30]
+				10,
+				20,
+				30,
+				opCLEAR,    // []
+				opPUSHB010, // [40, 50, 60]
+				40,
+				50,
+				60,
+				opSWAP,     // [40, 60, 50]
+				opDUP,      // [40, 60, 50, 50]
+				opDUP,      // [40, 60, 50, 50, 50]
+				opPOP,      // [40, 60, 50, 50]
+				opDEPTH,    // [40, 60, 50, 50, 4]
+				opCINDEX,   // [40, 60, 50, 50, 40]
+				opPUSHB000, // [40, 60, 50, 50, 40, 4]
+				4,
+				opMINDEX, // [40, 50, 50, 40, 60]
+			},
+			[]int32{40, 50, 50, 40, 60},
+			"",
+		},
+		{
+			"push ops",
+			[]byte{
+				opPUSHB000, // [255]
+				255,
+				opPUSHW001, // [255, -2, 253]
+				255,
+				254,
+				0,
+				253,
+				opNPUSHB, // [1, -2, 253, 1, 2]
+				2,
+				1,
+				2,
+				opNPUSHW, // [1, -2, 253, 1, 2, 0x0405, 0x0607, 0x0809]
+				3,
+				4,
+				5,
+				6,
+				7,
+				8,
+				9,
+			},
+			[]int32{255, -2, 253, 1, 2, 0x0405, 0x0607, 0x0809},
+			"",
+		},
+		{
+			"store ops",
+			[]byte{
+				opPUSHB011, // [1, 22, 3, 44]
+				1,
+				22,
+				3,
+				44,
+				opWS,       // [1, 22]
+				opWS,       // []
+				opPUSHB000, // [3]
+				3,
+				opRS, // [44]
+			},
+			[]int32{44},
+			"",
+		},
+		{
+			"comparison ops",
+			[]byte{
+				opPUSHB001, // [10, 20]
+				10,
+				20,
+				opLT,       // [1]
+				opPUSHB001, // [1, 10, 20]
+				10,
+				20,
+				opLTEQ,     // [1, 1]
+				opPUSHB001, // [1, 1, 10, 20]
+				10,
+				20,
+				opGT,       // [1, 1, 0]
+				opPUSHB001, // [1, 1, 0, 10, 20]
+				10,
+				20,
+				opGTEQ, // [1, 1, 0, 0]
+				opEQ,   // [1, 1, 1]
+				opNEQ,  // [1, 0]
+			},
+			[]int32{1, 0},
+			"",
+		},
+		{
+			"odd/even",
+			// Calculate odd(2+31/64), odd(2+32/64), even(2), even(1).
+			[]byte{
+				opPUSHB000, // [159]
+				159,
+				opODD,      // [0]
+				opPUSHB000, // [0, 160]
+				160,
+				opODD,      // [0, 1]
+				opPUSHB000, // [0, 1, 128]
+				128,
+				opEVEN,     // [0, 1, 1]
+				opPUSHB000, // [0, 1, 1, 64]
+				64,
+				opEVEN, // [0, 1, 1, 0]
+			},
+			[]int32{0, 1, 1, 0},
+			"",
+		},
+		{
+			"if true",
+			[]byte{
+				opPUSHB001, // [255, 1]
+				255,
+				1,
+				opIF,
+				opPUSHB000, // [255, 2]
+				2,
+				opEIF,
+				opPUSHB000, // [255, 2, 254]
+				254,
+			},
+			[]int32{255, 2, 254},
+			"",
+		},
+		{
+			"if false",
+			[]byte{
+				opPUSHB001, // [255, 0]
+				255,
+				0,
+				opIF,
+				opPUSHB000, // [255]
+				2,
+				opEIF,
+				opPUSHB000, // [255, 254]
+				254,
+			},
+			[]int32{255, 254},
+			"",
+		},
+		{
+			"if/else true",
+			[]byte{
+				opPUSHB000, // [1]
+				1,
+				opIF,
+				opPUSHB000, // [2]
+				2,
+				opELSE,
+				opPUSHB000, // not executed
+				3,
+				opEIF,
+			},
+			[]int32{2},
+			"",
+		},
+		{
+			"if/else false",
+			[]byte{
+				opPUSHB000, // [0]
+				0,
+				opIF,
+				opPUSHB000, // not executed
+				2,
+				opELSE,
+				opPUSHB000, // [3]
+				3,
+				opEIF,
+			},
+			[]int32{3},
+			"",
+		},
+		{
+			"if/else true if/else false",
+			// 0x58 is the opcode for opIF. The literal 0x58s below are pushed data.
+			[]byte{
+				opPUSHB010, // [255, 0, 1]
+				255,
+				0,
+				1,
+				opIF,
+				opIF,
+				opPUSHB001, // not executed
+				0x58,
+				0x58,
+				opELSE,
+				opPUSHW000, // [255, 0x5858]
+				0x58,
+				0x58,
+				opEIF,
+				opELSE,
+				opIF,
+				opNPUSHB, // not executed
+				3,
+				0x58,
+				0x58,
+				0x58,
+				opELSE,
+				opNPUSHW, // not executed
+				2,
+				0x58,
+				0x58,
+				0x58,
+				0x58,
+				opEIF,
+				opEIF,
+				opPUSHB000, // [255, 0x5858, 254]
+				254,
+			},
+			[]int32{255, 0x5858, 254},
+			"",
+		},
+		{
+			"if/else false if/else true",
+			// 0x58 is the opcode for opIF. The literal 0x58s below are pushed data.
+			[]byte{
+				opPUSHB010, // [255, 1, 0]
+				255,
+				1,
+				0,
+				opIF,
+				opIF,
+				opPUSHB001, // not executed
+				0x58,
+				0x58,
+				opELSE,
+				opPUSHW000, // not executed
+				0x58,
+				0x58,
+				opEIF,
+				opELSE,
+				opIF,
+				opNPUSHB, // [255, 0x58, 0x58, 0x58]
+				3,
+				0x58,
+				0x58,
+				0x58,
+				opELSE,
+				opNPUSHW, // not executed
+				2,
+				0x58,
+				0x58,
+				0x58,
+				0x58,
+				opEIF,
+				opEIF,
+				opPUSHB000, // [255, 0x58, 0x58, 0x58, 254]
+				254,
+			},
+			[]int32{255, 0x58, 0x58, 0x58, 254},
+			"",
+		},
+		{
+			"logical ops",
+			[]byte{
+				opPUSHB010, // [0, 10, 20]
+				0,
+				10,
+				20,
+				opAND, // [0, 1]
+				opOR,  // [1]
+				opNOT, // [0]
+			},
+			[]int32{0},
+			"",
+		},
+		{
+			"arithmetic ops",
+			// Calculate abs((-(1 - (2*3)))/2 + 1/64).
+			// The answer is 5/2 + 1/64 in ideal numbers, or 161 in 26.6 fixed point math.
+			[]byte{
+				opPUSHB010, // [64, 128, 192]
+				1 << 6,
+				2 << 6,
+				3 << 6,
+				opMUL,      // [64, 384]
+				opSUB,      // [-320]
+				opNEG,      // [320]
+				opPUSHB000, // [320, 128]
+				2 << 6,
+				opDIV,      // [160]
+				opPUSHB000, // [160, 1]
+				1,
+				opADD, // [161]
+				opABS, // [161]
+			},
+			[]int32{161},
+			"",
+		},
+		{
+			"floor, ceiling",
+			[]byte{
+				opPUSHB000, // [96]
+				96,
+				opFLOOR,    // [64]
+				opPUSHB000, // [64, 96]
+				96,
+				opCEILING, // [64, 128]
+			},
+			[]int32{64, 128},
+			"",
+		},
+		{
+			"rounding",
+			// Round 1.40625 (which is 90/64) under various rounding policies.
+			// See figure 20 of https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#rounding
+			[]byte{
+				opROFF,     // []
+				opPUSHB000, // [90]
+				90,
+				opROUND00,  // [90]
+				opRTG,      // [90]
+				opPUSHB000, // [90, 90]
+				90,
+				opROUND00,  // [90, 64]
+				opRTHG,     // [90, 64]
+				opPUSHB000, // [90, 64, 90]
+				90,
+				opROUND00,  // [90, 64, 96]
+				opRDTG,     // [90, 64, 96]
+				opPUSHB000, // [90, 64, 96, 90]
+				90,
+				opROUND00,  // [90, 64, 96, 64]
+				opRUTG,     // [90, 64, 96, 64]
+				opPUSHB000, // [90, 64, 96, 64, 90]
+				90,
+				opROUND00,  // [90, 64, 96, 64, 128]
+				opRTDG,     // [90, 64, 96, 64, 128]
+				opPUSHB000, // [90, 64, 96, 64, 128, 90]
+				90,
+				opROUND00, // [90, 64, 96, 64, 128, 96]
+			},
+			[]int32{90, 64, 96, 64, 128, 96},
+			"",
+		},
+		{
+			"super-rounding",
+			// See figure 20 of https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#rounding
+			// and the sign preservation steps of the "Order of rounding operations" section.
+			[]byte{
+				opPUSHB000, // [0x58]
+				0x58,
+				opSROUND,   // []
+				opPUSHW000, // [-81]
+				0xff,
+				0xaf,
+				opROUND00,  // [-80]
+				opPUSHW000, // [-80, -80]
+				0xff,
+				0xb0,
+				opROUND00,  // [-80, -80]
+				opPUSHW000, // [-80, -80, -17]
+				0xff,
+				0xef,
+				opROUND00,  // [-80, -80, -16]
+				opPUSHW000, // [-80, -80, -16, -16]
+				0xff,
+				0xf0,
+				opROUND00,  // [-80, -80, -16, -16]
+				opPUSHB000, // [-80, -80, -16, -16, 0]
+				0,
+				opROUND00,  // [-80, -80, -16, -16, 16]
+				opPUSHB000, // [-80, -80, -16, -16, 16, 16]
+				16,
+				opROUND00,  // [-80, -80, -16, -16, 16, 16]
+				opPUSHB000, // [-80, -80, -16, -16, 16, 16, 47]
+				47,
+				opROUND00,  // [-80, -80, -16, -16, 16, 16, 16]
+				opPUSHB000, // [-80, -80, -16, -16, 16, 16, 16, 48]
+				48,
+				opROUND00, // [-80, -80, -16, -16, 16, 16, 16, 80]
+			},
+			[]int32{-80, -80, -16, -16, 16, 16, 16, 80},
+			"",
+		},
+		{
+			"roll",
+			[]byte{
+				opPUSHB010, // [1, 2, 3]
+				1,
+				2,
+				3,
+				opROLL, // [2, 3, 1]
+			},
+			[]int32{2, 3, 1},
+			"",
+		},
+		{
+			"max/min",
+			[]byte{
+				opPUSHW001, // [-2, -3]
+				0xff,
+				0xfe,
+				0xff,
+				0xfd,
+				opMAX,      // [-2]
+				opPUSHW001, // [-2, -4, -5]
+				0xff,
+				0xfc,
+				0xff,
+				0xfb,
+				opMIN, // [-2, -5]
+			},
+			[]int32{-2, -5},
+			"",
+		},
+		{
+			"functions",
+			[]byte{
+				opPUSHB011, // [3, 7, 0, 3]
+				3,
+				7,
+				0,
+				3,
+
+				opFDEF, // Function #3 (not called)
+				opPUSHB000,
+				98,
+				opENDF,
+
+				opFDEF, // Function #0
+				opDUP,
+				opADD,
+				opENDF,
+
+				opFDEF, // Function #7
+				opPUSHB001,
+				10,
+				0,
+				opCALL,
+				opDUP,
+				opENDF,
+
+				opFDEF, // Function #3 (again)
+				opPUSHB000,
+				99,
+				opENDF,
+
+				opPUSHB001, // [2, 0]
+				2,
+				0,
+				opCALL,     // [4]
+				opPUSHB000, // [4, 3]
+				3,
+				opLOOPCALL, // [99, 99, 99, 99]
+				opPUSHB000, // [99, 99, 99, 99, 7]
+				7,
+				opCALL, // [99, 99, 99, 99, 20, 20]
+			},
+			[]int32{99, 99, 99, 99, 20, 20},
+			"",
+		},
+	}
+
+	for _, tc := range testCases {
+		h := &hinter{}
+		h.init(&Font{
+			maxStorage:       32,
+			maxStackElements: 100,
+		}, 768)
+		err, errStr := h.run(tc.prog, nil, nil, nil, nil), ""
+		if err != nil {
+			errStr = err.Error()
+		}
+		if tc.errStr != "" {
+			if errStr == "" {
+				t.Errorf("%s: got no error, want %q", tc.desc, tc.errStr)
+			} else if !strings.Contains(errStr, tc.errStr) {
+				t.Errorf("%s: got error %q, want one containing %q", tc.desc, errStr, tc.errStr)
+			}
+			continue
+		}
+		if errStr != "" {
+			t.Errorf("%s: got error %q, want none", tc.desc, errStr)
+			continue
+		}
+		got := h.stack[:len(tc.want)]
+		if !reflect.DeepEqual(got, tc.want) {
+			t.Errorf("%s: got %v, want %v", tc.desc, got, tc.want)
+			continue
+		}
+	}
+}
+
+// TestMove tests that the hinter.move method matches the output of the C
+// Freetype implementation.
+func TestMove(t *testing.T) {
+	h, p := hinter{}, Point{}
+	testCases := []struct {
+		pvX, pvY, fvX, fvY f2dot14
+		wantX, wantY       fixed.Int26_6
+	}{
+		{+0x4000, +0x0000, +0x4000, +0x0000, +1000, +0},
+		{+0x4000, +0x0000, -0x4000, +0x0000, +1000, +0},
+		{-0x4000, +0x0000, +0x4000, +0x0000, -1000, +0},
+		{-0x4000, +0x0000, -0x4000, +0x0000, -1000, +0},
+		{+0x0000, +0x4000, +0x0000, +0x4000, +0, +1000},
+		{+0x0000, +0x4000, +0x0000, -0x4000, +0, +1000},
+		{+0x4000, +0x0000, +0x2d41, +0x2d41, +1000, +1000},
+		{+0x4000, +0x0000, -0x2d41, +0x2d41, +1000, -1000},
+		{+0x4000, +0x0000, +0x2d41, -0x2d41, +1000, -1000},
+		{+0x4000, +0x0000, -0x2d41, -0x2d41, +1000, +1000},
+		{-0x4000, +0x0000, +0x2d41, +0x2d41, -1000, -1000},
+		{-0x4000, +0x0000, -0x2d41, +0x2d41, -1000, +1000},
+		{-0x4000, +0x0000, +0x2d41, -0x2d41, -1000, +1000},
+		{-0x4000, +0x0000, -0x2d41, -0x2d41, -1000, -1000},
+		{+0x376d, +0x2000, +0x2d41, +0x2d41, +732, +732},
+		{-0x376d, +0x2000, +0x2d41, +0x2d41, -2732, -2732},
+		{+0x376d, +0x2000, +0x2d41, -0x2d41, +2732, -2732},
+		{-0x376d, +0x2000, +0x2d41, -0x2d41, -732, +732},
+		{-0x376d, -0x2000, +0x2d41, +0x2d41, -732, -732},
+		{+0x376d, +0x2000, +0x4000, +0x0000, +1155, +0},
+		{+0x376d, +0x2000, +0x0000, +0x4000, +0, +2000},
+	}
+	for _, tc := range testCases {
+		p = Point{}
+		h.gs.pv = [2]f2dot14{tc.pvX, tc.pvY}
+		h.gs.fv = [2]f2dot14{tc.fvX, tc.fvY}
+		h.move(&p, 1000, true)
+		tx := p.Flags&flagTouchedX != 0
+		ty := p.Flags&flagTouchedY != 0
+		wantTX := tc.fvX != 0
+		wantTY := tc.fvY != 0
+		if p.X != tc.wantX || p.Y != tc.wantY || tx != wantTX || ty != wantTY {
+			t.Errorf("pv=%v, fv=%v\ngot  %d, %d, %t, %t\nwant %d, %d, %t, %t",
+				h.gs.pv, h.gs.fv, p.X, p.Y, tx, ty, tc.wantX, tc.wantY, wantTX, wantTY)
+			continue
+		}
+
+		// Check that p is aligned with the freedom vector.
+		a := int64(p.X) * int64(tc.fvY)
+		b := int64(p.Y) * int64(tc.fvX)
+		if a != b {
+			t.Errorf("pv=%v, fv=%v, p=%v not aligned with fv", h.gs.pv, h.gs.fv, p)
+			continue
+		}
+
+		// Check that the projected p is 1000 away from the origin.
+		dotProd := (int64(p.X)*int64(tc.pvX) + int64(p.Y)*int64(tc.pvY) + 1<<13) >> 14
+		if dotProd != 1000 {
+			t.Errorf("pv=%v, fv=%v, p=%v not 1000 from origin", h.gs.pv, h.gs.fv, p)
+			continue
+		}
+	}
+}
+
+// TestNormalize tests that the normalize function matches the output of the C
+// Freetype implementation.
+func TestNormalize(t *testing.T) {
+	testCases := [][2]f2dot14{
+		{-15895, 3974},
+		{-15543, 5181},
+		{-14654, 7327},
+		{-11585, 11585},
+		{0, 16384},
+		{11585, 11585},
+		{14654, 7327},
+		{15543, 5181},
+		{15895, 3974},
+		{16066, 3213},
+		{16161, 2694},
+		{16219, 2317},
+		{16257, 2032},
+		{16284, 1809},
+	}
+	for i, want := range testCases {
+		got := normalize(f2dot14(i)-4, 1)
+		if got != want {
+			t.Errorf("i=%d: got %v, want %v", i, got, want)
+		}
+	}
+}

vendor/github.com/golang/freetype/truetype/opcodes.go

@@ -0,0 +1,289 @@
+// Copyright 2012 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+// The Truetype opcodes are summarized at
+// https://developer.apple.com/fonts/TTRefMan/RM07/appendixA.html
+
+const (
+	opSVTCA0    = 0x00 // Set freedom and projection Vectors To Coordinate Axis
+	opSVTCA1    = 0x01 // .
+	opSPVTCA0   = 0x02 // Set Projection Vector To Coordinate Axis
+	opSPVTCA1   = 0x03 // .
+	opSFVTCA0   = 0x04 // Set Freedom Vector to Coordinate Axis
+	opSFVTCA1   = 0x05 // .
+	opSPVTL0    = 0x06 // Set Projection Vector To Line
+	opSPVTL1    = 0x07 // .
+	opSFVTL0    = 0x08 // Set Freedom Vector To Line
+	opSFVTL1    = 0x09 // .
+	opSPVFS     = 0x0a // Set Projection Vector From Stack
+	opSFVFS     = 0x0b // Set Freedom Vector From Stack
+	opGPV       = 0x0c // Get Projection Vector
+	opGFV       = 0x0d // Get Freedom Vector
+	opSFVTPV    = 0x0e // Set Freedom Vector To Projection Vector
+	opISECT     = 0x0f // moves point p to the InterSECTion of two lines
+	opSRP0      = 0x10 // Set Reference Point 0
+	opSRP1      = 0x11 // Set Reference Point 1
+	opSRP2      = 0x12 // Set Reference Point 2
+	opSZP0      = 0x13 // Set Zone Pointer 0
+	opSZP1      = 0x14 // Set Zone Pointer 1
+	opSZP2      = 0x15 // Set Zone Pointer 2
+	opSZPS      = 0x16 // Set Zone PointerS
+	opSLOOP     = 0x17 // Set LOOP variable
+	opRTG       = 0x18 // Round To Grid
+	opRTHG      = 0x19 // Round To Half Grid
+	opSMD       = 0x1a // Set Minimum Distance
+	opELSE      = 0x1b // ELSE clause
+	opJMPR      = 0x1c // JuMP Relative
+	opSCVTCI    = 0x1d // Set Control Value Table Cut-In
+	opSSWCI     = 0x1e // Set Single Width Cut-In
+	opSSW       = 0x1f // Set Single Width
+	opDUP       = 0x20 // DUPlicate top stack element
+	opPOP       = 0x21 // POP top stack element
+	opCLEAR     = 0x22 // CLEAR the stack
+	opSWAP      = 0x23 // SWAP the top two elements on the stack
+	opDEPTH     = 0x24 // DEPTH of the stack
+	opCINDEX    = 0x25 // Copy the INDEXed element to the top of the stack
+	opMINDEX    = 0x26 // Move the INDEXed element to the top of the stack
+	opALIGNPTS  = 0x27 // ALIGN PoinTS
+	op_0x28     = 0x28 // deprecated
+	opUTP       = 0x29 // UnTouch Point
+	opLOOPCALL  = 0x2a // LOOP and CALL function
+	opCALL      = 0x2b // CALL function
+	opFDEF      = 0x2c // Function DEFinition
+	opENDF      = 0x2d // END Function definition
+	opMDAP0     = 0x2e // Move Direct Absolute Point
+	opMDAP1     = 0x2f // .
+	opIUP0      = 0x30 // Interpolate Untouched Points through the outline
+	opIUP1      = 0x31 // .
+	opSHP0      = 0x32 // SHift Point using reference point
+	opSHP1      = 0x33 // .
+	opSHC0      = 0x34 // SHift Contour using reference point
+	opSHC1      = 0x35 // .
+	opSHZ0      = 0x36 // SHift Zone using reference point
+	opSHZ1      = 0x37 // .
+	opSHPIX     = 0x38 // SHift point by a PIXel amount
+	opIP        = 0x39 // Interpolate Point
+	opMSIRP0    = 0x3a // Move Stack Indirect Relative Point
+	opMSIRP1    = 0x3b // .
+	opALIGNRP   = 0x3c // ALIGN to Reference Point
+	opRTDG      = 0x3d // Round To Double Grid
+	opMIAP0     = 0x3e // Move Indirect Absolute Point
+	opMIAP1     = 0x3f // .
+	opNPUSHB    = 0x40 // PUSH N Bytes
+	opNPUSHW    = 0x41 // PUSH N Words
+	opWS        = 0x42 // Write Store
+	opRS        = 0x43 // Read Store
+	opWCVTP     = 0x44 // Write Control Value Table in Pixel units
+	opRCVT      = 0x45 // Read Control Value Table entry
+	opGC0       = 0x46 // Get Coordinate projected onto the projection vector
+	opGC1       = 0x47 // .
+	opSCFS      = 0x48 // Sets Coordinate From the Stack using projection vector and freedom vector
+	opMD0       = 0x49 // Measure Distance
+	opMD1       = 0x4a // .
+	opMPPEM     = 0x4b // Measure Pixels Per EM
+	opMPS       = 0x4c // Measure Point Size
+	opFLIPON    = 0x4d // set the auto FLIP Boolean to ON
+	opFLIPOFF   = 0x4e // set the auto FLIP Boolean to OFF
+	opDEBUG     = 0x4f // DEBUG call
+	opLT        = 0x50 // Less Than
+	opLTEQ      = 0x51 // Less Than or EQual
+	opGT        = 0x52 // Greater Than
+	opGTEQ      = 0x53 // Greater Than or EQual
+	opEQ        = 0x54 // EQual
+	opNEQ       = 0x55 // Not EQual
+	opODD       = 0x56 // ODD
+	opEVEN      = 0x57 // EVEN
+	opIF        = 0x58 // IF test
+	opEIF       = 0x59 // End IF
+	opAND       = 0x5a // logical AND
+	opOR        = 0x5b // logical OR
+	opNOT       = 0x5c // logical NOT
+	opDELTAP1   = 0x5d // DELTA exception P1
+	opSDB       = 0x5e // Set Delta Base in the graphics state
+	opSDS       = 0x5f // Set Delta Shift in the graphics state
+	opADD       = 0x60 // ADD
+	opSUB       = 0x61 // SUBtract
+	opDIV       = 0x62 // DIVide
+	opMUL       = 0x63 // MULtiply
+	opABS       = 0x64 // ABSolute value
+	opNEG       = 0x65 // NEGate
+	opFLOOR     = 0x66 // FLOOR
+	opCEILING   = 0x67 // CEILING
+	opROUND00   = 0x68 // ROUND value
+	opROUND01   = 0x69 // .
+	opROUND10   = 0x6a // .
+	opROUND11   = 0x6b // .
+	opNROUND00  = 0x6c // No ROUNDing of value
+	opNROUND01  = 0x6d // .
+	opNROUND10  = 0x6e // .
+	opNROUND11  = 0x6f // .
+	opWCVTF     = 0x70 // Write Control Value Table in Funits
+	opDELTAP2   = 0x71 // DELTA exception P2
+	opDELTAP3   = 0x72 // DELTA exception P3
+	opDELTAC1   = 0x73 // DELTA exception C1
+	opDELTAC2   = 0x74 // DELTA exception C2
+	opDELTAC3   = 0x75 // DELTA exception C3
+	opSROUND    = 0x76 // Super ROUND
+	opS45ROUND  = 0x77 // Super ROUND 45 degrees
+	opJROT      = 0x78 // Jump Relative On True
+	opJROF      = 0x79 // Jump Relative On False
+	opROFF      = 0x7a // Round OFF
+	op_0x7b     = 0x7b // deprecated
+	opRUTG      = 0x7c // Round Up To Grid
+	opRDTG      = 0x7d // Round Down To Grid
+	opSANGW     = 0x7e // Set ANGle Weight
+	opAA        = 0x7f // Adjust Angle
+	opFLIPPT    = 0x80 // FLIP PoinT
+	opFLIPRGON  = 0x81 // FLIP RanGe ON
+	opFLIPRGOFF = 0x82 // FLIP RanGe OFF
+	op_0x83     = 0x83 // deprecated
+	op_0x84     = 0x84 // deprecated
+	opSCANCTRL  = 0x85 // SCAN conversion ConTRoL
+	opSDPVTL0   = 0x86 // Set Dual Projection Vector To Line
+	opSDPVTL1   = 0x87 // .
+	opGETINFO   = 0x88 // GET INFOrmation
+	opIDEF      = 0x89 // Instruction DEFinition
+	opROLL      = 0x8a // ROLL the top three stack elements
+	opMAX       = 0x8b // MAXimum of top two stack elements
+	opMIN       = 0x8c // MINimum of top two stack elements
+	opSCANTYPE  = 0x8d // SCANTYPE
+	opINSTCTRL  = 0x8e // INSTRuction execution ConTRoL
+	op_0x8f     = 0x8f
+	op_0x90     = 0x90
+	op_0x91     = 0x91
+	op_0x92     = 0x92
+	op_0x93     = 0x93
+	op_0x94     = 0x94
+	op_0x95     = 0x95
+	op_0x96     = 0x96
+	op_0x97     = 0x97
+	op_0x98     = 0x98
+	op_0x99     = 0x99
+	op_0x9a     = 0x9a
+	op_0x9b     = 0x9b
+	op_0x9c     = 0x9c
+	op_0x9d     = 0x9d
+	op_0x9e     = 0x9e
+	op_0x9f     = 0x9f
+	op_0xa0     = 0xa0
+	op_0xa1     = 0xa1
+	op_0xa2     = 0xa2
+	op_0xa3     = 0xa3
+	op_0xa4     = 0xa4
+	op_0xa5     = 0xa5
+	op_0xa6     = 0xa6
+	op_0xa7     = 0xa7
+	op_0xa8     = 0xa8
+	op_0xa9     = 0xa9
+	op_0xaa     = 0xaa
+	op_0xab     = 0xab
+	op_0xac     = 0xac
+	op_0xad     = 0xad
+	op_0xae     = 0xae
+	op_0xaf     = 0xaf
+	opPUSHB000  = 0xb0 // PUSH Bytes
+	opPUSHB001  = 0xb1 // .
+	opPUSHB010  = 0xb2 // .
+	opPUSHB011  = 0xb3 // .
+	opPUSHB100  = 0xb4 // .
+	opPUSHB101  = 0xb5 // .
+	opPUSHB110  = 0xb6 // .
+	opPUSHB111  = 0xb7 // .
+	opPUSHW000  = 0xb8 // PUSH Words
+	opPUSHW001  = 0xb9 // .
+	opPUSHW010  = 0xba // .
+	opPUSHW011  = 0xbb // .
+	opPUSHW100  = 0xbc // .
+	opPUSHW101  = 0xbd // .
+	opPUSHW110  = 0xbe // .
+	opPUSHW111  = 0xbf // .
+	opMDRP00000 = 0xc0 // Move Direct Relative Point
+	opMDRP00001 = 0xc1 // .
+	opMDRP00010 = 0xc2 // .
+	opMDRP00011 = 0xc3 // .
+	opMDRP00100 = 0xc4 // .
+	opMDRP00101 = 0xc5 // .
+	opMDRP00110 = 0xc6 // .
+	opMDRP00111 = 0xc7 // .
+	opMDRP01000 = 0xc8 // .
+	opMDRP01001 = 0xc9 // .
+	opMDRP01010 = 0xca // .
+	opMDRP01011 = 0xcb // .
+	opMDRP01100 = 0xcc // .
+	opMDRP01101 = 0xcd // .
+	opMDRP01110 = 0xce // .
+	opMDRP01111 = 0xcf // .
+	opMDRP10000 = 0xd0 // .
+	opMDRP10001 = 0xd1 // .
+	opMDRP10010 = 0xd2 // .
+	opMDRP10011 = 0xd3 // .
+	opMDRP10100 = 0xd4 // .
+	opMDRP10101 = 0xd5 // .
+	opMDRP10110 = 0xd6 // .
+	opMDRP10111 = 0xd7 // .
+	opMDRP11000 = 0xd8 // .
+	opMDRP11001 = 0xd9 // .
+	opMDRP11010 = 0xda // .
+	opMDRP11011 = 0xdb // .
+	opMDRP11100 = 0xdc // .
+	opMDRP11101 = 0xdd // .
+	opMDRP11110 = 0xde // .
+	opMDRP11111 = 0xdf // .
+	opMIRP00000 = 0xe0 // Move Indirect Relative Point
+	opMIRP00001 = 0xe1 // .
+	opMIRP00010 = 0xe2 // .
+	opMIRP00011 = 0xe3 // .
+	opMIRP00100 = 0xe4 // .
+	opMIRP00101 = 0xe5 // .
+	opMIRP00110 = 0xe6 // .
+	opMIRP00111 = 0xe7 // .
+	opMIRP01000 = 0xe8 // .
+	opMIRP01001 = 0xe9 // .
+	opMIRP01010 = 0xea // .
+	opMIRP01011 = 0xeb // .
+	opMIRP01100 = 0xec // .
+	opMIRP01101 = 0xed // .
+	opMIRP01110 = 0xee // .
+	opMIRP01111 = 0xef // .
+	opMIRP10000 = 0xf0 // .
+	opMIRP10001 = 0xf1 // .
+	opMIRP10010 = 0xf2 // .
+	opMIRP10011 = 0xf3 // .
+	opMIRP10100 = 0xf4 // .
+	opMIRP10101 = 0xf5 // .
+	opMIRP10110 = 0xf6 // .
+	opMIRP10111 = 0xf7 // .
+	opMIRP11000 = 0xf8 // .
+	opMIRP11001 = 0xf9 // .
+	opMIRP11010 = 0xfa // .
+	opMIRP11011 = 0xfb // .
+	opMIRP11100 = 0xfc // .
+	opMIRP11101 = 0xfd // .
+	opMIRP11110 = 0xfe // .
+	opMIRP11111 = 0xff // .
+)
+
+// popCount is the number of stack elements that each opcode pops.
+var popCount = [256]uint8{
+	// 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f
+	0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 0, 0, 0, 5, // 0x00 - 0x0f
+	1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, // 0x10 - 0x1f
+	1, 1, 0, 2, 0, 1, 1, 2, 0, 1, 2, 1, 1, 0, 1, 1, // 0x20 - 0x2f
+	0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 2, 2, 0, 0, 2, 2, // 0x30 - 0x3f
+	0, 0, 2, 1, 2, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 0, // 0x40 - 0x4f
+	2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, 1, 1, 1, // 0x50 - 0x5f
+	2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6f
+	2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 0, 0, 0, 0, 1, 1, // 0x70 - 0x7f
+	0, 2, 2, 0, 0, 1, 2, 2, 1, 1, 3, 2, 2, 1, 2, 0, // 0x80 - 0x8f
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x90 - 0x9f
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xa0 - 0xaf
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xb0 - 0xbf
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xc0 - 0xcf
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xd0 - 0xdf
+	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xe0 - 0xef
+	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xf0 - 0xff
+}

vendor/github.com/golang/freetype/truetype/truetype.go

@@ -0,0 +1,653 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// Package truetype provides a parser for the TTF and TTC file formats.
+// Those formats are documented at http://developer.apple.com/fonts/TTRefMan/
+// and http://www.microsoft.com/typography/otspec/
+//
+// Some of a font's methods provide lengths or co-ordinates, e.g. bounds, font
+// metrics and control points. All these methods take a scale parameter, which
+// is the number of pixels in 1 em, expressed as a 26.6 fixed point value. For
+// example, if 1 em is 10 pixels then scale is fixed.I(10), which is equal to
+// fixed.Int26_6(10 << 6).
+//
+// To measure a TrueType font in ideal FUnit space, use scale equal to
+// font.FUnitsPerEm().
+package truetype // import "github.com/golang/freetype/truetype"
+
+import (
+	"fmt"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// An Index is a Font's index of a rune.
+type Index uint16
+
+// A NameID identifies a name table entry.
+//
+// See https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6name.html
+type NameID uint16
+
+const (
+	NameIDCopyright          NameID = 0
+	NameIDFontFamily                = 1
+	NameIDFontSubfamily             = 2
+	NameIDUniqueSubfamilyID         = 3
+	NameIDFontFullName              = 4
+	NameIDNameTableVersion          = 5
+	NameIDPostscriptName            = 6
+	NameIDTrademarkNotice           = 7
+	NameIDManufacturerName          = 8
+	NameIDDesignerName              = 9
+	NameIDFontDescription           = 10
+	NameIDFontVendorURL             = 11
+	NameIDFontDesignerURL           = 12
+	NameIDFontLicense               = 13
+	NameIDFontLicenseURL            = 14
+	NameIDPreferredFamily           = 16
+	NameIDPreferredSubfamily        = 17
+	NameIDCompatibleName            = 18
+	NameIDSampleText                = 19
+)
+
+const (
+	// A 32-bit encoding consists of a most-significant 16-bit Platform ID and a
+	// least-significant 16-bit Platform Specific ID. The magic numbers are
+	// specified at https://www.microsoft.com/typography/otspec/name.htm
+	unicodeEncodingBMPOnly  = 0x00000003 // PID = 0 (Unicode), PSID = 3 (Unicode 2.0 BMP Only)
+	unicodeEncodingFull     = 0x00000004 // PID = 0 (Unicode), PSID = 4 (Unicode 2.0 Full Repertoire)
+	microsoftSymbolEncoding = 0x00030000 // PID = 3 (Microsoft), PSID = 0 (Symbol)
+	microsoftUCS2Encoding   = 0x00030001 // PID = 3 (Microsoft), PSID = 1 (UCS-2)
+	microsoftUCS4Encoding   = 0x0003000a // PID = 3 (Microsoft), PSID = 10 (UCS-4)
+)
+
+// An HMetric holds the horizontal metrics of a single glyph.
+type HMetric struct {
+	AdvanceWidth, LeftSideBearing fixed.Int26_6
+}
+
+// A VMetric holds the vertical metrics of a single glyph.
+type VMetric struct {
+	AdvanceHeight, TopSideBearing fixed.Int26_6
+}
+
+// A FormatError reports that the input is not a valid TrueType font.
+type FormatError string
+
+func (e FormatError) Error() string {
+	return "freetype: invalid TrueType format: " + string(e)
+}
+
+// An UnsupportedError reports that the input uses a valid but unimplemented
+// TrueType feature.
+type UnsupportedError string
+
+func (e UnsupportedError) Error() string {
+	return "freetype: unsupported TrueType feature: " + string(e)
+}
+
+// u32 returns the big-endian uint32 at b[i:].
+func u32(b []byte, i int) uint32 {
+	return uint32(b[i])<<24 | uint32(b[i+1])<<16 | uint32(b[i+2])<<8 | uint32(b[i+3])
+}
+
+// u16 returns the big-endian uint16 at b[i:].
+func u16(b []byte, i int) uint16 {
+	return uint16(b[i])<<8 | uint16(b[i+1])
+}
+
+// readTable returns a slice of the TTF data given by a table's directory entry.
+func readTable(ttf []byte, offsetLength []byte) ([]byte, error) {
+	offset := int(u32(offsetLength, 0))
+	if offset < 0 {
+		return nil, FormatError(fmt.Sprintf("offset too large: %d", uint32(offset)))
+	}
+	length := int(u32(offsetLength, 4))
+	if length < 0 {
+		return nil, FormatError(fmt.Sprintf("length too large: %d", uint32(length)))
+	}
+	end := offset + length
+	if end < 0 || end > len(ttf) {
+		return nil, FormatError(fmt.Sprintf("offset + length too large: %d", uint32(offset)+uint32(length)))
+	}
+	return ttf[offset:end], nil
+}
+
+// parseSubtables returns the offset and platformID of the best subtable in
+// table, where best favors a Unicode cmap encoding, and failing that, a
+// Microsoft cmap encoding. offset is the offset of the first subtable in
+// table, and size is the size of each subtable.
+//
+// If pred is non-nil, then only subtables that satisfy that predicate will be
+// considered.
+func parseSubtables(table []byte, name string, offset, size int, pred func([]byte) bool) (
+	bestOffset int, bestPID uint32, retErr error) {
+
+	if len(table) < 4 {
+		return 0, 0, FormatError(name + " too short")
+	}
+	nSubtables := int(u16(table, 2))
+	if len(table) < size*nSubtables+offset {
+		return 0, 0, FormatError(name + " too short")
+	}
+	ok := false
+	for i := 0; i < nSubtables; i, offset = i+1, offset+size {
+		if pred != nil && !pred(table[offset:]) {
+			continue
+		}
+		// We read the 16-bit Platform ID and 16-bit Platform Specific ID as a single uint32.
+		// All values are big-endian.
+		pidPsid := u32(table, offset)
+		// We prefer the Unicode cmap encoding. Failing to find that, we fall
+		// back onto the Microsoft cmap encoding.
+		if pidPsid == unicodeEncodingBMPOnly || pidPsid == unicodeEncodingFull {
+			bestOffset, bestPID, ok = offset, pidPsid>>16, true
+			break
+
+		} else if pidPsid == microsoftSymbolEncoding ||
+			pidPsid == microsoftUCS2Encoding ||
+			pidPsid == microsoftUCS4Encoding {
+
+			bestOffset, bestPID, ok = offset, pidPsid>>16, true
+			// We don't break out of the for loop, so that Unicode can override Microsoft.
+		}
+	}
+	if !ok {
+		return 0, 0, UnsupportedError(name + " encoding")
+	}
+	return bestOffset, bestPID, nil
+}
+
+const (
+	locaOffsetFormatUnknown int = iota
+	locaOffsetFormatShort
+	locaOffsetFormatLong
+)
+
+// A cm holds a parsed cmap entry.
+type cm struct {
+	start, end, delta, offset uint32
+}
+
+// A Font represents a Truetype font.
+type Font struct {
+	// Tables sliced from the TTF data. The different tables are documented
+	// at http://developer.apple.com/fonts/TTRefMan/RM06/Chap6.html
+	cmap, cvt, fpgm, glyf, hdmx, head, hhea, hmtx, kern, loca, maxp, name, os2, prep, vmtx []byte
+
+	cmapIndexes []byte
+
+	// Cached values derived from the raw ttf data.
+	cm                      []cm
+	locaOffsetFormat        int
+	nGlyph, nHMetric, nKern int
+	fUnitsPerEm             int32
+	ascent                  int32               // In FUnits.
+	descent                 int32               // In FUnits; typically negative.
+	bounds                  fixed.Rectangle26_6 // In FUnits.
+	// Values from the maxp section.
+	maxTwilightPoints, maxStorage, maxFunctionDefs, maxStackElements uint16
+}
+
+func (f *Font) parseCmap() error {
+	const (
+		cmapFormat4         = 4
+		cmapFormat12        = 12
+		languageIndependent = 0
+	)
+
+	offset, _, err := parseSubtables(f.cmap, "cmap", 4, 8, nil)
+	if err != nil {
+		return err
+	}
+	offset = int(u32(f.cmap, offset+4))
+	if offset <= 0 || offset > len(f.cmap) {
+		return FormatError("bad cmap offset")
+	}
+
+	cmapFormat := u16(f.cmap, offset)
+	switch cmapFormat {
+	case cmapFormat4:
+		language := u16(f.cmap, offset+4)
+		if language != languageIndependent {
+			return UnsupportedError(fmt.Sprintf("language: %d", language))
+		}
+		segCountX2 := int(u16(f.cmap, offset+6))
+		if segCountX2%2 == 1 {
+			return FormatError(fmt.Sprintf("bad segCountX2: %d", segCountX2))
+		}
+		segCount := segCountX2 / 2
+		offset += 14
+		f.cm = make([]cm, segCount)
+		for i := 0; i < segCount; i++ {
+			f.cm[i].end = uint32(u16(f.cmap, offset))
+			offset += 2
+		}
+		offset += 2
+		for i := 0; i < segCount; i++ {
+			f.cm[i].start = uint32(u16(f.cmap, offset))
+			offset += 2
+		}
+		for i := 0; i < segCount; i++ {
+			f.cm[i].delta = uint32(u16(f.cmap, offset))
+			offset += 2
+		}
+		for i := 0; i < segCount; i++ {
+			f.cm[i].offset = uint32(u16(f.cmap, offset))
+			offset += 2
+		}
+		f.cmapIndexes = f.cmap[offset:]
+		return nil
+
+	case cmapFormat12:
+		if u16(f.cmap, offset+2) != 0 {
+			return FormatError(fmt.Sprintf("cmap format: % x", f.cmap[offset:offset+4]))
+		}
+		length := u32(f.cmap, offset+4)
+		language := u32(f.cmap, offset+8)
+		if language != languageIndependent {
+			return UnsupportedError(fmt.Sprintf("language: %d", language))
+		}
+		nGroups := u32(f.cmap, offset+12)
+		if length != 12*nGroups+16 {
+			return FormatError("inconsistent cmap length")
+		}
+		offset += 16
+		f.cm = make([]cm, nGroups)
+		for i := uint32(0); i < nGroups; i++ {
+			f.cm[i].start = u32(f.cmap, offset+0)
+			f.cm[i].end = u32(f.cmap, offset+4)
+			f.cm[i].delta = u32(f.cmap, offset+8) - f.cm[i].start
+			offset += 12
+		}
+		return nil
+	}
+	return UnsupportedError(fmt.Sprintf("cmap format: %d", cmapFormat))
+}
+
+func (f *Font) parseHead() error {
+	if len(f.head) != 54 {
+		return FormatError(fmt.Sprintf("bad head length: %d", len(f.head)))
+	}
+	f.fUnitsPerEm = int32(u16(f.head, 18))
+	f.bounds.Min.X = fixed.Int26_6(int16(u16(f.head, 36)))
+	f.bounds.Min.Y = fixed.Int26_6(int16(u16(f.head, 38)))
+	f.bounds.Max.X = fixed.Int26_6(int16(u16(f.head, 40)))
+	f.bounds.Max.Y = fixed.Int26_6(int16(u16(f.head, 42)))
+	switch i := u16(f.head, 50); i {
+	case 0:
+		f.locaOffsetFormat = locaOffsetFormatShort
+	case 1:
+		f.locaOffsetFormat = locaOffsetFormatLong
+	default:
+		return FormatError(fmt.Sprintf("bad indexToLocFormat: %d", i))
+	}
+	return nil
+}
+
+func (f *Font) parseHhea() error {
+	if len(f.hhea) != 36 {
+		return FormatError(fmt.Sprintf("bad hhea length: %d", len(f.hhea)))
+	}
+	f.ascent = int32(int16(u16(f.hhea, 4)))
+	f.descent = int32(int16(u16(f.hhea, 6)))
+	f.nHMetric = int(u16(f.hhea, 34))
+	if 4*f.nHMetric+2*(f.nGlyph-f.nHMetric) != len(f.hmtx) {
+		return FormatError(fmt.Sprintf("bad hmtx length: %d", len(f.hmtx)))
+	}
+	return nil
+}
+
+func (f *Font) parseKern() error {
+	// Apple's TrueType documentation (http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html) says:
+	// "Previous versions of the 'kern' table defined both the version and nTables fields in the header
+	// as UInt16 values and not UInt32 values. Use of the older format on the Mac OS is discouraged
+	// (although AAT can sense an old kerning table and still make correct use of it). Microsoft
+	// Windows still uses the older format for the 'kern' table and will not recognize the newer one.
+	// Fonts targeted for the Mac OS only should use the new format; fonts targeted for both the Mac OS
+	// and Windows should use the old format."
+	// Since we expect that almost all fonts aim to be Windows-compatible, we only parse the "older" format,
+	// just like the C Freetype implementation.
+	if len(f.kern) == 0 {
+		if f.nKern != 0 {
+			return FormatError("bad kern table length")
+		}
+		return nil
+	}
+	if len(f.kern) < 18 {
+		return FormatError("kern data too short")
+	}
+	version, offset := u16(f.kern, 0), 2
+	if version != 0 {
+		return UnsupportedError(fmt.Sprintf("kern version: %d", version))
+	}
+
+	n, offset := u16(f.kern, offset), offset+2
+	if n == 0 {
+		return UnsupportedError("kern nTables: 0")
+	}
+	// TODO: support multiple subtables. In practice, almost all .ttf files
+	// have only one subtable, if they have a kern table at all. But it's not
+	// impossible. Xolonium Regular (https://fontlibrary.org/en/font/xolonium)
+	// has 3 subtables. Those subtables appear to be disjoint, rather than
+	// being the same kerning pairs encoded in three different ways.
+	//
+	// For now, we'll use only the first subtable.
+
+	offset += 2 // Skip the version.
+	length, offset := int(u16(f.kern, offset)), offset+2
+	coverage, offset := u16(f.kern, offset), offset+2
+	if coverage != 0x0001 {
+		// We only support horizontal kerning.
+		return UnsupportedError(fmt.Sprintf("kern coverage: 0x%04x", coverage))
+	}
+	f.nKern, offset = int(u16(f.kern, offset)), offset+2
+	if 6*f.nKern != length-14 {
+		return FormatError("bad kern table length")
+	}
+	return nil
+}
+
+func (f *Font) parseMaxp() error {
+	if len(f.maxp) != 32 {
+		return FormatError(fmt.Sprintf("bad maxp length: %d", len(f.maxp)))
+	}
+	f.nGlyph = int(u16(f.maxp, 4))
+	f.maxTwilightPoints = u16(f.maxp, 16)
+	f.maxStorage = u16(f.maxp, 18)
+	f.maxFunctionDefs = u16(f.maxp, 20)
+	f.maxStackElements = u16(f.maxp, 24)
+	return nil
+}
+
+// scale returns x divided by f.fUnitsPerEm, rounded to the nearest integer.
+func (f *Font) scale(x fixed.Int26_6) fixed.Int26_6 {
+	if x >= 0 {
+		x += fixed.Int26_6(f.fUnitsPerEm) / 2
+	} else {
+		x -= fixed.Int26_6(f.fUnitsPerEm) / 2
+	}
+	return x / fixed.Int26_6(f.fUnitsPerEm)
+}
+
+// Bounds returns the union of a Font's glyphs' bounds.
+func (f *Font) Bounds(scale fixed.Int26_6) fixed.Rectangle26_6 {
+	b := f.bounds
+	b.Min.X = f.scale(scale * b.Min.X)
+	b.Min.Y = f.scale(scale * b.Min.Y)
+	b.Max.X = f.scale(scale * b.Max.X)
+	b.Max.Y = f.scale(scale * b.Max.Y)
+	return b
+}
+
+// FUnitsPerEm returns the number of FUnits in a Font's em-square's side.
+func (f *Font) FUnitsPerEm() int32 {
+	return f.fUnitsPerEm
+}
+
+// Index returns a Font's index for the given rune.
+func (f *Font) Index(x rune) Index {
+	c := uint32(x)
+	for i, j := 0, len(f.cm); i < j; {
+		h := i + (j-i)/2
+		cm := &f.cm[h]
+		if c < cm.start {
+			j = h
+		} else if cm.end < c {
+			i = h + 1
+		} else if cm.offset == 0 {
+			return Index(c + cm.delta)
+		} else {
+			offset := int(cm.offset) + 2*(h-len(f.cm)+int(c-cm.start))
+			return Index(u16(f.cmapIndexes, offset))
+		}
+	}
+	return 0
+}
+
+// Name returns the Font's name value for the given NameID. It returns "" if
+// there was an error, or if that name was not found.
+func (f *Font) Name(id NameID) string {
+	x, platformID, err := parseSubtables(f.name, "name", 6, 12, func(b []byte) bool {
+		return NameID(u16(b, 6)) == id
+	})
+	if err != nil {
+		return ""
+	}
+	offset, length := u16(f.name, 4)+u16(f.name, x+10), u16(f.name, x+8)
+	// Return the ASCII value of the encoded string.
+	// The string is encoded as UTF-16 on non-Apple platformIDs; Apple is platformID 1.
+	src := f.name[offset : offset+length]
+	var dst []byte
+	if platformID != 1 { // UTF-16.
+		if len(src)&1 != 0 {
+			return ""
+		}
+		dst = make([]byte, len(src)/2)
+		for i := range dst {
+			dst[i] = printable(u16(src, 2*i))
+		}
+	} else { // ASCII.
+		dst = make([]byte, len(src))
+		for i, c := range src {
+			dst[i] = printable(uint16(c))
+		}
+	}
+	return string(dst)
+}
+
+func printable(r uint16) byte {
+	if 0x20 <= r && r < 0x7f {
+		return byte(r)
+	}
+	return '?'
+}
+
+// unscaledHMetric returns the unscaled horizontal metrics for the glyph with
+// the given index.
+func (f *Font) unscaledHMetric(i Index) (h HMetric) {
+	j := int(i)
+	if j < 0 || f.nGlyph <= j {
+		return HMetric{}
+	}
+	if j >= f.nHMetric {
+		p := 4 * (f.nHMetric - 1)
+		return HMetric{
+			AdvanceWidth:    fixed.Int26_6(u16(f.hmtx, p)),
+			LeftSideBearing: fixed.Int26_6(int16(u16(f.hmtx, p+2*(j-f.nHMetric)+4))),
+		}
+	}
+	return HMetric{
+		AdvanceWidth:    fixed.Int26_6(u16(f.hmtx, 4*j)),
+		LeftSideBearing: fixed.Int26_6(int16(u16(f.hmtx, 4*j+2))),
+	}
+}
+
+// HMetric returns the horizontal metrics for the glyph with the given index.
+func (f *Font) HMetric(scale fixed.Int26_6, i Index) HMetric {
+	h := f.unscaledHMetric(i)
+	h.AdvanceWidth = f.scale(scale * h.AdvanceWidth)
+	h.LeftSideBearing = f.scale(scale * h.LeftSideBearing)
+	return h
+}
+
+// unscaledVMetric returns the unscaled vertical metrics for the glyph with
+// the given index. yMax is the top of the glyph's bounding box.
+func (f *Font) unscaledVMetric(i Index, yMax fixed.Int26_6) (v VMetric) {
+	j := int(i)
+	if j < 0 || f.nGlyph <= j {
+		return VMetric{}
+	}
+	if 4*j+4 <= len(f.vmtx) {
+		return VMetric{
+			AdvanceHeight:  fixed.Int26_6(u16(f.vmtx, 4*j)),
+			TopSideBearing: fixed.Int26_6(int16(u16(f.vmtx, 4*j+2))),
+		}
+	}
+	// The OS/2 table has grown over time.
+	// https://developer.apple.com/fonts/TTRefMan/RM06/Chap6OS2.html
+	// says that it was originally 68 bytes. Optional fields, including
+	// the ascender and descender, are described at
+	// http://www.microsoft.com/typography/otspec/os2.htm
+	if len(f.os2) >= 72 {
+		sTypoAscender := fixed.Int26_6(int16(u16(f.os2, 68)))
+		sTypoDescender := fixed.Int26_6(int16(u16(f.os2, 70)))
+		return VMetric{
+			AdvanceHeight:  sTypoAscender - sTypoDescender,
+			TopSideBearing: sTypoAscender - yMax,
+		}
+	}
+	return VMetric{
+		AdvanceHeight:  fixed.Int26_6(f.fUnitsPerEm),
+		TopSideBearing: 0,
+	}
+}
+
+// VMetric returns the vertical metrics for the glyph with the given index.
+func (f *Font) VMetric(scale fixed.Int26_6, i Index) VMetric {
+	// TODO: should 0 be bounds.YMax?
+	v := f.unscaledVMetric(i, 0)
+	v.AdvanceHeight = f.scale(scale * v.AdvanceHeight)
+	v.TopSideBearing = f.scale(scale * v.TopSideBearing)
+	return v
+}
+
+// Kern returns the horizontal adjustment for the given glyph pair. A positive
+// kern means to move the glyphs further apart.
+func (f *Font) Kern(scale fixed.Int26_6, i0, i1 Index) fixed.Int26_6 {
+	if f.nKern == 0 {
+		return 0
+	}
+	g := uint32(i0)<<16 | uint32(i1)
+	lo, hi := 0, f.nKern
+	for lo < hi {
+		i := (lo + hi) / 2
+		ig := u32(f.kern, 18+6*i)
+		if ig < g {
+			lo = i + 1
+		} else if ig > g {
+			hi = i
+		} else {
+			return f.scale(scale * fixed.Int26_6(int16(u16(f.kern, 22+6*i))))
+		}
+	}
+	return 0
+}
+
+// Parse returns a new Font for the given TTF or TTC data.
+//
+// For TrueType Collections, the first font in the collection is parsed.
+func Parse(ttf []byte) (font *Font, err error) {
+	return parse(ttf, 0)
+}
+
+func parse(ttf []byte, offset int) (font *Font, err error) {
+	if len(ttf)-offset < 12 {
+		err = FormatError("TTF data is too short")
+		return
+	}
+	originalOffset := offset
+	magic, offset := u32(ttf, offset), offset+4
+	switch magic {
+	case 0x00010000:
+		// No-op.
+	case 0x74746366: // "ttcf" as a big-endian uint32.
+		if originalOffset != 0 {
+			err = FormatError("recursive TTC")
+			return
+		}
+		ttcVersion, offset := u32(ttf, offset), offset+4
+		if ttcVersion != 0x00010000 && ttcVersion != 0x00020000 {
+			err = FormatError("bad TTC version")
+			return
+		}
+		numFonts, offset := int(u32(ttf, offset)), offset+4
+		if numFonts <= 0 {
+			err = FormatError("bad number of TTC fonts")
+			return
+		}
+		if len(ttf[offset:])/4 < numFonts {
+			err = FormatError("TTC offset table is too short")
+			return
+		}
+		// TODO: provide an API to select which font in a TrueType collection to return,
+		// not just the first one. This may require an API to parse a TTC's name tables,
+		// so users of this package can select the font in a TTC by name.
+		offset = int(u32(ttf, offset))
+		if offset <= 0 || offset > len(ttf) {
+			err = FormatError("bad TTC offset")
+			return
+		}
+		return parse(ttf, offset)
+	default:
+		err = FormatError("bad TTF version")
+		return
+	}
+	n, offset := int(u16(ttf, offset)), offset+2
+	offset += 6 // Skip the searchRange, entrySelector and rangeShift.
+	if len(ttf) < 16*n+offset {
+		err = FormatError("TTF data is too short")
+		return
+	}
+	f := new(Font)
+	// Assign the table slices.
+	for i := 0; i < n; i++ {
+		x := 16*i + offset
+		switch string(ttf[x : x+4]) {
+		case "cmap":
+			f.cmap, err = readTable(ttf, ttf[x+8:x+16])
+		case "cvt ":
+			f.cvt, err = readTable(ttf, ttf[x+8:x+16])
+		case "fpgm":
+			f.fpgm, err = readTable(ttf, ttf[x+8:x+16])
+		case "glyf":
+			f.glyf, err = readTable(ttf, ttf[x+8:x+16])
+		case "hdmx":
+			f.hdmx, err = readTable(ttf, ttf[x+8:x+16])
+		case "head":
+			f.head, err = readTable(ttf, ttf[x+8:x+16])
+		case "hhea":
+			f.hhea, err = readTable(ttf, ttf[x+8:x+16])
+		case "hmtx":
+			f.hmtx, err = readTable(ttf, ttf[x+8:x+16])
+		case "kern":
+			f.kern, err = readTable(ttf, ttf[x+8:x+16])
+		case "loca":
+			f.loca, err = readTable(ttf, ttf[x+8:x+16])
+		case "maxp":
+			f.maxp, err = readTable(ttf, ttf[x+8:x+16])
+		case "name":
+			f.name, err = readTable(ttf, ttf[x+8:x+16])
+		case "OS/2":
+			f.os2, err = readTable(ttf, ttf[x+8:x+16])
+		case "prep":
+			f.prep, err = readTable(ttf, ttf[x+8:x+16])
+		case "vmtx":
+			f.vmtx, err = readTable(ttf, ttf[x+8:x+16])
+		}
+		if err != nil {
+			return
+		}
+	}
+	// Parse and sanity-check the TTF data.
+	if err = f.parseHead(); err != nil {
+		return
+	}
+	if err = f.parseMaxp(); err != nil {
+		return
+	}
+	if err = f.parseCmap(); err != nil {
+		return
+	}
+	if err = f.parseKern(); err != nil {
+		return
+	}
+	if err = f.parseHhea(); err != nil {
+		return
+	}
+	font = f
+	return
+}

vendor/github.com/golang/freetype/truetype/truetype_test.go

@@ -0,0 +1,400 @@
+// Copyright 2012 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"strconv"
+	"strings"
+	"testing"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func parseTestdataFont(name string) (f *Font, testdataIsOptional bool, err error) {
+	b, err := ioutil.ReadFile(fmt.Sprintf("../testdata/%s.ttf", name))
+	if err != nil {
+		// The "x-foo" fonts are optional tests, as they are not checked
+		// in for copyright or file size reasons.
+		return nil, strings.HasPrefix(name, "x-"), fmt.Errorf("%s: ReadFile: %v", name, err)
+	}
+	f, err = Parse(b)
+	if err != nil {
+		return nil, true, fmt.Errorf("%s: Parse: %v", name, err)
+	}
+	return f, false, nil
+}
+
+func mkBounds(minX, minY, maxX, maxY fixed.Int26_6) fixed.Rectangle26_6 {
+	return fixed.Rectangle26_6{
+		Min: fixed.Point26_6{
+			X: minX,
+			Y: minY,
+		},
+		Max: fixed.Point26_6{
+			X: maxX,
+			Y: maxY,
+		},
+	}
+}
+
+// TestParse tests that the luxisr.ttf metrics and glyphs are parsed correctly.
+// The numerical values can be manually verified by examining luxisr.ttx.
+func TestParse(t *testing.T) {
+	f, _, err := parseTestdataFont("luxisr")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, want := f.FUnitsPerEm(), int32(2048); got != want {
+		t.Errorf("FUnitsPerEm: got %v, want %v", got, want)
+	}
+	fupe := fixed.Int26_6(f.FUnitsPerEm())
+	if got, want := f.Bounds(fupe), mkBounds(-441, -432, 2024, 2033); got != want {
+		t.Errorf("Bounds: got %v, want %v", got, want)
+	}
+
+	i0 := f.Index('A')
+	i1 := f.Index('V')
+	if i0 != 36 || i1 != 57 {
+		t.Fatalf("Index: i0, i1 = %d, %d, want 36, 57", i0, i1)
+	}
+	if got, want := f.HMetric(fupe, i0), (HMetric{1366, 19}); got != want {
+		t.Errorf("HMetric: got %v, want %v", got, want)
+	}
+	if got, want := f.VMetric(fupe, i0), (VMetric{2465, 553}); got != want {
+		t.Errorf("VMetric: got %v, want %v", got, want)
+	}
+	if got, want := f.Kern(fupe, i0, i1), fixed.Int26_6(-144); got != want {
+		t.Errorf("Kern: got %v, want %v", got, want)
+	}
+
+	g := &GlyphBuf{}
+	err = g.Load(f, fupe, i0, font.HintingNone)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	g0 := &GlyphBuf{
+		Bounds: g.Bounds,
+		Points: g.Points,
+		Ends:   g.Ends,
+	}
+	g1 := &GlyphBuf{
+		Bounds: mkBounds(19, 0, 1342, 1480),
+		Points: []Point{
+			{19, 0, 51},
+			{581, 1480, 1},
+			{789, 1480, 51},
+			{1342, 0, 1},
+			{1116, 0, 35},
+			{962, 410, 3},
+			{368, 410, 33},
+			{214, 0, 3},
+			{428, 566, 19},
+			{904, 566, 33},
+			{667, 1200, 3},
+		},
+		Ends: []int{8, 11},
+	}
+	if got, want := fmt.Sprint(g0), fmt.Sprint(g1); got != want {
+		t.Errorf("GlyphBuf:\ngot  %v\nwant %v", got, want)
+	}
+}
+
+func TestIndex(t *testing.T) {
+	testCases := map[string]map[rune]Index{
+		"luxisr": {
+			' ':      3,
+			'!':      4,
+			'A':      36,
+			'V':      57,
+			'É':      101,
+			'fl':      193,
+			'\u22c5': 385,
+			'中':      0,
+		},
+
+		// The x-etc test cases use those versions of the .ttf files provided
+		// by Ubuntu 14.04. See testdata/make-other-hinting-txts.sh for details.
+
+		"x-arial-bold": {
+			' ':      3,
+			'+':      14,
+			'0':      19,
+			'_':      66,
+			'w':      90,
+			'~':      97,
+			'Ä':      98,
+			'fl':      192,
+			'½':      242,
+			'σ':      305,
+			'λ':      540,
+			'ỹ':      1275,
+			'\u04e9': 1319,
+			'中':      0,
+		},
+		"x-deja-vu-sans-oblique": {
+			' ':      3,
+			'*':      13,
+			'Œ':      276,
+			'ω':      861,
+			'‡':      2571,
+			'⊕':      3110,
+			'fl':      4728,
+			'\ufb03': 4729,
+			'\ufffd': 4813,
+			// TODO: '\U0001f640': ???,
+			'中': 0,
+		},
+		"x-droid-sans-japanese": {
+			' ':      0,
+			'\u3000': 3,
+			'\u3041': 25,
+			'\u30fe': 201,
+			'\uff61': 202,
+			'\uff67': 208,
+			'\uff9e': 263,
+			'\uff9f': 264,
+			'\u4e00': 265,
+			'\u557e': 1000,
+			'\u61b6': 2024,
+			'\u6ede': 3177,
+			'\u7505': 3555,
+			'\u81e3': 4602,
+			'\u81e5': 4603,
+			'\u81e7': 4604,
+			'\u81e8': 4605,
+			'\u81ea': 4606,
+			'\u81ed': 4607,
+			'\u81f3': 4608,
+			'\u81f4': 4609,
+			'\u91c7': 5796,
+			'\u9fa0': 6620,
+			'\u203e': 12584,
+		},
+		"x-times-new-roman": {
+			' ':      3,
+			':':      29,
+			'fl':      192,
+			'Ŀ':      273,
+			'♠':      388,
+			'Ŗ':      451,
+			'Σ':      520,
+			'\u200D': 745,
+			'Ẽ':      1216,
+			'\u04e9': 1319,
+			'中':      0,
+		},
+	}
+	for name, wants := range testCases {
+		f, testdataIsOptional, err := parseTestdataFont(name)
+		if err != nil {
+			if testdataIsOptional {
+				t.Log(err)
+			} else {
+				t.Fatal(err)
+			}
+			continue
+		}
+		for r, want := range wants {
+			if got := f.Index(r); got != want {
+				t.Errorf("%s: Index of %q, aka %U: got %d, want %d", name, r, r, got, want)
+			}
+		}
+	}
+}
+
+func TestName(t *testing.T) {
+	testCases := map[string]string{
+		"luximr": "Luxi Mono",
+		"luxirr": "Luxi Serif",
+		"luxisr": "Luxi Sans",
+	}
+
+	for name, want := range testCases {
+		f, testdataIsOptional, err := parseTestdataFont(name)
+		if err != nil {
+			if testdataIsOptional {
+				t.Log(err)
+			} else {
+				t.Fatal(err)
+			}
+			continue
+		}
+		if got := f.Name(NameIDFontFamily); got != want {
+			t.Errorf("%s: got %q, want %q", name, got, want)
+		}
+	}
+}
+
+type scalingTestData struct {
+	advanceWidth fixed.Int26_6
+	bounds       fixed.Rectangle26_6
+	points       []Point
+}
+
+// scalingTestParse parses a line of points like
+// 213 -22 -111 236 555;-22 -111 1, 178 555 1, 236 555 1, 36 -111 1
+// The line will not have a trailing "\n".
+func scalingTestParse(line string) (ret scalingTestData) {
+	next := func(s string) (string, fixed.Int26_6) {
+		t, i := "", strings.Index(s, " ")
+		if i != -1 {
+			s, t = s[:i], s[i+1:]
+		}
+		x, _ := strconv.Atoi(s)
+		return t, fixed.Int26_6(x)
+	}
+
+	i := strings.Index(line, ";")
+	prefix, line := line[:i], line[i+1:]
+
+	prefix, ret.advanceWidth = next(prefix)
+	prefix, ret.bounds.Min.X = next(prefix)
+	prefix, ret.bounds.Min.Y = next(prefix)
+	prefix, ret.bounds.Max.X = next(prefix)
+	prefix, ret.bounds.Max.Y = next(prefix)
+
+	ret.points = make([]Point, 0, 1+strings.Count(line, ","))
+	for len(line) > 0 {
+		s := line
+		if i := strings.Index(line, ","); i != -1 {
+			s, line = line[:i], line[i+1:]
+			for len(line) > 0 && line[0] == ' ' {
+				line = line[1:]
+			}
+		} else {
+			line = ""
+		}
+		s, x := next(s)
+		s, y := next(s)
+		s, f := next(s)
+		ret.points = append(ret.points, Point{X: x, Y: y, Flags: uint32(f)})
+	}
+	return ret
+}
+
+// scalingTestEquals is equivalent to, but faster than, calling
+// reflect.DeepEqual(a, b), and also returns the index of the first non-equal
+// element. It also treats a nil []Point and an empty non-nil []Point as equal.
+// a and b must have equal length.
+func scalingTestEquals(a, b []Point) (index int, equals bool) {
+	for i, p := range a {
+		if p != b[i] {
+			return i, false
+		}
+	}
+	return 0, true
+}
+
+var scalingTestCases = []struct {
+	name string
+	size int
+}{
+	{"luxisr", 12},
+	{"x-arial-bold", 11},
+	{"x-deja-vu-sans-oblique", 17},
+	{"x-droid-sans-japanese", 9},
+	{"x-times-new-roman", 13},
+}
+
+func testScaling(t *testing.T, h font.Hinting) {
+	for _, tc := range scalingTestCases {
+		f, testdataIsOptional, err := parseTestdataFont(tc.name)
+		if err != nil {
+			if testdataIsOptional {
+				t.Log(err)
+			} else {
+				t.Error(err)
+			}
+			continue
+		}
+		hintingStr := "sans"
+		if h != font.HintingNone {
+			hintingStr = "with"
+		}
+		testFile, err := os.Open(fmt.Sprintf(
+			"../testdata/%s-%dpt-%s-hinting.txt", tc.name, tc.size, hintingStr))
+		if err != nil {
+			t.Errorf("%s: Open: %v", tc.name, err)
+			continue
+		}
+		defer testFile.Close()
+
+		wants := []scalingTestData{}
+		scanner := bufio.NewScanner(testFile)
+		if scanner.Scan() {
+			major, minor, patch := 0, 0, 0
+			_, err := fmt.Sscanf(scanner.Text(), "freetype version %d.%d.%d", &major, &minor, &patch)
+			if err != nil {
+				t.Errorf("%s: version information: %v", tc.name, err)
+			}
+			if (major < 2) || (major == 2 && minor < 5) || (major == 2 && minor == 5 && patch < 1) {
+				t.Errorf("%s: need freetype version >= 2.5.1.\n"+
+					"Try setting LD_LIBRARY_PATH=/path/to/freetype_built_from_src/objs/.libs/\n"+
+					"and re-running testdata/make-other-hinting-txts.sh",
+					tc.name)
+				continue
+			}
+		} else {
+			t.Errorf("%s: no version information", tc.name)
+			continue
+		}
+		for scanner.Scan() {
+			wants = append(wants, scalingTestParse(scanner.Text()))
+		}
+		if err := scanner.Err(); err != nil && err != io.EOF {
+			t.Errorf("%s: Scanner: %v", tc.name, err)
+			continue
+		}
+
+		glyphBuf := &GlyphBuf{}
+		for i, want := range wants {
+			if err = glyphBuf.Load(f, fixed.I(tc.size), Index(i), h); err != nil {
+				t.Errorf("%s: glyph #%d: Load: %v", tc.name, i, err)
+				continue
+			}
+			got := scalingTestData{
+				advanceWidth: glyphBuf.AdvanceWidth,
+				bounds:       glyphBuf.Bounds,
+				points:       glyphBuf.Points,
+			}
+
+			if got.advanceWidth != want.advanceWidth {
+				t.Errorf("%s: glyph #%d advance width:\ngot  %v\nwant %v",
+					tc.name, i, got.advanceWidth, want.advanceWidth)
+				continue
+			}
+
+			if got.bounds != want.bounds {
+				t.Errorf("%s: glyph #%d bounds:\ngot  %v\nwant %v",
+					tc.name, i, got.bounds, want.bounds)
+				continue
+			}
+
+			for i := range got.points {
+				got.points[i].Flags &= 0x01
+			}
+			if len(got.points) != len(want.points) {
+				t.Errorf("%s: glyph #%d:\ngot  %v\nwant %v\ndifferent slice lengths: %d versus %d",
+					tc.name, i, got.points, want.points, len(got.points), len(want.points))
+				continue
+			}
+			if j, equals := scalingTestEquals(got.points, want.points); !equals {
+				t.Errorf("%s: glyph #%d:\ngot  %v\nwant %v\nat index %d: %v versus %v",
+					tc.name, i, got.points, want.points, j, got.points[j], want.points[j])
+				continue
+			}
+		}
+	}
+}
+
+func TestScalingHintingNone(t *testing.T) { testScaling(t, font.HintingNone) }
+func TestScalingHintingFull(t *testing.T) { testScaling(t, font.HintingFull) }

vendor/github.com/golang/groupcache/.gitignore

@@ -0,0 +1 @@
+*~

vendor/github.com/golang/groupcache/LICENSE

@@ -0,0 +1,191 @@
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+
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vendor/github.com/golang/groupcache/README.md

@@ -0,0 +1,73 @@
+# groupcache
+
+## Summary
+
+groupcache is a caching and cache-filling library, intended as a
+replacement for memcached in many cases.
+
+For API docs and examples, see http://godoc.org/github.com/golang/groupcache
+
+## Comparison to memcached
+
+### **Like memcached**, groupcache:
+
+ * shards by key to select which peer is responsible for that key
+
+### **Unlike memcached**, groupcache:
+
+ * does not require running a separate set of servers, thus massively
+   reducing deployment/configuration pain.  groupcache is a client
+   library as well as a server.  It connects to its own peers.
+
+ * comes with a cache filling mechanism.  Whereas memcached just says
+   "Sorry, cache miss", often resulting in a thundering herd of
+   database (or whatever) loads from an unbounded number of clients
+   (which has resulted in several fun outages), groupcache coordinates
+   cache fills such that only one load in one process of an entire
+   replicated set of processes populates the cache, then multiplexes
+   the loaded value to all callers.
+
+ * does not support versioned values.  If key "foo" is value "bar",
+   key "foo" must always be "bar".  There are neither cache expiration
+   times, nor explicit cache evictions.  Thus there is also no CAS,
+   nor Increment/Decrement.  This also means that groupcache....
+
+ * ... supports automatic mirroring of super-hot items to multiple
+   processes.  This prevents memcached hot spotting where a machine's
+   CPU and/or NIC are overloaded by very popular keys/values.
+
+ * is currently only available for Go.  It's very unlikely that I
+   (bradfitz@) will port the code to any other language.
+
+## Loading process
+
+In a nutshell, a groupcache lookup of **Get("foo")** looks like:
+
+(On machine #5 of a set of N machines running the same code)
+
+ 1. Is the value of "foo" in local memory because it's super hot?  If so, use it.
+
+ 2. Is the value of "foo" in local memory because peer #5 (the current
+    peer) is the owner of it?  If so, use it.
+
+ 3. Amongst all the peers in my set of N, am I the owner of the key
+    "foo"?  (e.g. does it consistent hash to 5?)  If so, load it.  If
+    other callers come in, via the same process or via RPC requests
+    from peers, they block waiting for the load to finish and get the
+    same answer.  If not, RPC to the peer that's the owner and get
+    the answer.  If the RPC fails, just load it locally (still with
+    local dup suppression).
+
+## Users
+
+groupcache is in production use by dl.google.com (its original user),
+parts of Blogger, parts of Google Code, parts of Google Fiber, parts
+of Google production monitoring systems, etc.
+
+## Presentations
+
+See http://talks.golang.org/2013/oscon-dl.slide
+
+## Help
+
+Use the golang-nuts mailing list for any discussion or questions.

vendor/github.com/golang/groupcache/byteview.go

@@ -0,0 +1,175 @@
+/*
+Copyright 2012 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package groupcache
+
+import (
+	"bytes"
+	"errors"
+	"io"
+	"strings"
+)
+
+// A ByteView holds an immutable view of bytes.
+// Internally it wraps either a []byte or a string,
+// but that detail is invisible to callers.
+//
+// A ByteView is meant to be used as a value type, not
+// a pointer (like a time.Time).
+type ByteView struct {
+	// If b is non-nil, b is used, else s is used.
+	b []byte
+	s string
+}
+
+// Len returns the view's length.
+func (v ByteView) Len() int {
+	if v.b != nil {
+		return len(v.b)
+	}
+	return len(v.s)
+}
+
+// ByteSlice returns a copy of the data as a byte slice.
+func (v ByteView) ByteSlice() []byte {
+	if v.b != nil {
+		return cloneBytes(v.b)
+	}
+	return []byte(v.s)
+}
+
+// String returns the data as a string, making a copy if necessary.
+func (v ByteView) String() string {
+	if v.b != nil {
+		return string(v.b)
+	}
+	return v.s
+}
+
+// At returns the byte at index i.
+func (v ByteView) At(i int) byte {
+	if v.b != nil {
+		return v.b[i]
+	}
+	return v.s[i]
+}
+
+// Slice slices the view between the provided from and to indices.
+func (v ByteView) Slice(from, to int) ByteView {
+	if v.b != nil {
+		return ByteView{b: v.b[from:to]}
+	}
+	return ByteView{s: v.s[from:to]}
+}
+
+// SliceFrom slices the view from the provided index until the end.
+func (v ByteView) SliceFrom(from int) ByteView {
+	if v.b != nil {
+		return ByteView{b: v.b[from:]}
+	}
+	return ByteView{s: v.s[from:]}
+}
+
+// Copy copies b into dest and returns the number of bytes copied.
+func (v ByteView) Copy(dest []byte) int {
+	if v.b != nil {
+		return copy(dest, v.b)
+	}
+	return copy(dest, v.s)
+}
+
+// Equal returns whether the bytes in b are the same as the bytes in
+// b2.
+func (v ByteView) Equal(b2 ByteView) bool {
+	if b2.b == nil {
+		return v.EqualString(b2.s)
+	}
+	return v.EqualBytes(b2.b)
+}
+
+// EqualString returns whether the bytes in b are the same as the bytes
+// in s.
+func (v ByteView) EqualString(s string) bool {
+	if v.b == nil {
+		return v.s == s
+	}
+	l := v.Len()
+	if len(s) != l {
+		return false
+	}
+	for i, bi := range v.b {
+		if bi != s[i] {
+			return false
+		}
+	}
+	return true
+}
+
+// EqualBytes returns whether the bytes in b are the same as the bytes
+// in b2.
+func (v ByteView) EqualBytes(b2 []byte) bool {
+	if v.b != nil {
+		return bytes.Equal(v.b, b2)
+	}
+	l := v.Len()
+	if len(b2) != l {
+		return false
+	}
+	for i, bi := range b2 {
+		if bi != v.s[i] {
+			return false
+		}
+	}
+	return true
+}
+
+// Reader returns an io.ReadSeeker for the bytes in v.
+func (v ByteView) Reader() io.ReadSeeker {
+	if v.b != nil {
+		return bytes.NewReader(v.b)
+	}
+	return strings.NewReader(v.s)
+}
+
+// ReadAt implements io.ReaderAt on the bytes in v.
+func (v ByteView) ReadAt(p []byte, off int64) (n int, err error) {
+	if off < 0 {
+		return 0, errors.New("view: invalid offset")
+	}
+	if off >= int64(v.Len()) {
+		return 0, io.EOF
+	}
+	n = v.SliceFrom(int(off)).Copy(p)
+	if n < len(p) {
+		err = io.EOF
+	}
+	return
+}
+
+// WriteTo implements io.WriterTo on the bytes in v.
+func (v ByteView) WriteTo(w io.Writer) (n int64, err error) {
+	var m int
+	if v.b != nil {
+		m, err = w.Write(v.b)
+	} else {
+		m, err = io.WriteString(w, v.s)
+	}
+	if err == nil && m < v.Len() {
+		err = io.ErrShortWrite
+	}
+	n = int64(m)
+	return
+}

vendor/github.com/golang/groupcache/byteview_test.go

@@ -0,0 +1,147 @@
+/*
+Copyright 2012 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package groupcache
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"testing"
+)
+
+func TestByteView(t *testing.T) {
+	for _, s := range []string{"", "x", "yy"} {
+		for _, v := range []ByteView{of([]byte(s)), of(s)} {
+			name := fmt.Sprintf("string %q, view %+v", s, v)
+			if v.Len() != len(s) {
+				t.Errorf("%s: Len = %d; want %d", name, v.Len(), len(s))
+			}
+			if v.String() != s {
+				t.Errorf("%s: String = %q; want %q", name, v.String(), s)
+			}
+			var longDest [3]byte
+			if n := v.Copy(longDest[:]); n != len(s) {
+				t.Errorf("%s: long Copy = %d; want %d", name, n, len(s))
+			}
+			var shortDest [1]byte
+			if n := v.Copy(shortDest[:]); n != min(len(s), 1) {
+				t.Errorf("%s: short Copy = %d; want %d", name, n, min(len(s), 1))
+			}
+			if got, err := ioutil.ReadAll(v.Reader()); err != nil || string(got) != s {
+				t.Errorf("%s: Reader = %q, %v; want %q", name, got, err, s)
+			}
+			if got, err := ioutil.ReadAll(io.NewSectionReader(v, 0, int64(len(s)))); err != nil || string(got) != s {
+				t.Errorf("%s: SectionReader of ReaderAt = %q, %v; want %q", name, got, err, s)
+			}
+			var dest bytes.Buffer
+			if _, err := v.WriteTo(&dest); err != nil || !bytes.Equal(dest.Bytes(), []byte(s)) {
+				t.Errorf("%s: WriteTo = %q, %v; want %q", name, dest.Bytes(), err, s)
+			}
+		}
+	}
+}
+
+// of returns a byte view of the []byte or string in x.
+func of(x interface{}) ByteView {
+	if bytes, ok := x.([]byte); ok {
+		return ByteView{b: bytes}
+	}
+	return ByteView{s: x.(string)}
+}
+
+func TestByteViewEqual(t *testing.T) {
+	tests := []struct {
+		a    interface{} // string or []byte
+		b    interface{} // string or []byte
+		want bool
+	}{
+		{"x", "x", true},
+		{"x", "y", false},
+		{"x", "yy", false},
+		{[]byte("x"), []byte("x"), true},
+		{[]byte("x"), []byte("y"), false},
+		{[]byte("x"), []byte("yy"), false},
+		{[]byte("x"), "x", true},
+		{[]byte("x"), "y", false},
+		{[]byte("x"), "yy", false},
+		{"x", []byte("x"), true},
+		{"x", []byte("y"), false},
+		{"x", []byte("yy"), false},
+	}
+	for i, tt := range tests {
+		va := of(tt.a)
+		if bytes, ok := tt.b.([]byte); ok {
+			if got := va.EqualBytes(bytes); got != tt.want {
+				t.Errorf("%d. EqualBytes = %v; want %v", i, got, tt.want)
+			}
+		} else {
+			if got := va.EqualString(tt.b.(string)); got != tt.want {
+				t.Errorf("%d. EqualString = %v; want %v", i, got, tt.want)
+			}
+		}
+		if got := va.Equal(of(tt.b)); got != tt.want {
+			t.Errorf("%d. Equal = %v; want %v", i, got, tt.want)
+		}
+	}
+}
+
+func TestByteViewSlice(t *testing.T) {
+	tests := []struct {
+		in   string
+		from int
+		to   interface{} // nil to mean the end (SliceFrom); else int
+		want string
+	}{
+		{
+			in:   "abc",
+			from: 1,
+			to:   2,
+			want: "b",
+		},
+		{
+			in:   "abc",
+			from: 1,
+			want: "bc",
+		},
+		{
+			in:   "abc",
+			to:   2,
+			want: "ab",
+		},
+	}
+	for i, tt := range tests {
+		for _, v := range []ByteView{of([]byte(tt.in)), of(tt.in)} {
+			name := fmt.Sprintf("test %d, view %+v", i, v)
+			if tt.to != nil {
+				v = v.Slice(tt.from, tt.to.(int))
+			} else {
+				v = v.SliceFrom(tt.from)
+			}
+			if v.String() != tt.want {
+				t.Errorf("%s: got %q; want %q", name, v.String(), tt.want)
+			}
+		}
+	}
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}