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Increase performance of YCbCr and RGBA encoding

This commit is contained in:
Evan Oberholster 2022-07-03 22:56:01 -04:00
parent 9badc7c997
commit 478f64d264
1 changed files with 50 additions and 13 deletions
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63
avif.go
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@ -154,19 +154,56 @@ func Encode(w io.Writer, m image.Image, o *Options) error {
defer C.free(dataPtr) defer C.free(dataPtr)
data := (*[1 << 30]byte)(dataPtr)[:dataSize:dataSize] data := (*[1 << 30]byte)(dataPtr)[:dataSize:dataSize]
yPos := 0 switch img := m.(type) {
uPos := ySize case *image.YCbCr:
for j := rec.Min.Y; j < rec.Max.Y; j++ { yPos := 0
for i := rec.Min.X; i < rec.Max.X; i++ { uPos := ySize
r16, g16, b16, _ := m.At(i, j).RGBA() for y := rec.Min.Y; y < rec.Max.Y; y++ {
y, u, v := rgb2yuv(r16, g16, b16) for x := rec.Min.X; x < rec.Max.X; x++ {
data[yPos] = y r, g, b, _ := img.At(x, y).RGBA()
yPos++ Y, u, v := rgb2yuv(r, g, b)
// TODO(Kagami): Resample chroma planes with some better filter. data[yPos] = Y
if (i-rec.Min.X)&1 == 0 && (j-rec.Min.Y)&1 == 0 { yPos++
data[uPos] = u // TODO(Kagami): Resample chroma planes with some better filter.
data[uPos+uSize] = v if (x-rec.Min.X)&1 == 0 && (y-rec.Min.Y)&1 == 0 {
uPos++ data[uPos] = u
data[uPos+uSize] = v
uPos++
}
}
}
case *image.RGBA:
yPos := 0
uPos := ySize
for y := rec.Min.Y; y < rec.Max.Y; y++ {
for x := rec.Min.X; x < rec.Max.X; x++ {
r, g, b, _ := img.RGBAAt(x, y).RGBA()
Y, u, v := rgb2yuv(r, g, b)
data[yPos] = Y
yPos++
// TODO(Kagami): Resample chroma planes with some better filter.
if (x-rec.Min.X)&1 == 0 && (y-rec.Min.Y)&1 == 0 {
data[uPos] = u
data[uPos+uSize] = v
uPos++
}
}
}
default:
yPos := 0
uPos := ySize
for j := rec.Min.Y; j < rec.Max.Y; j++ {
for i := rec.Min.X; i < rec.Max.X; i++ {
r16, g16, b16, _ := img.At(i, j).RGBA()
y, u, v := rgb2yuv(r16, g16, b16)
data[yPos] = y
yPos++
// TODO(Kagami): Resample chroma planes with some better filter.
if (i-rec.Min.X)&1 == 0 && (j-rec.Min.Y)&1 == 0 {
data[uPos] = u
data[uPos+uSize] = v
uPos++
}
} }
} }
} }