draw: distinguish YCbCr fast paths by their chroma subsample ratios.
These code paths aren't actually fast yet. That will be a follow-up
change.
Change-Id: I814992573cc6af422e49d0ddf336003e662897a5
Reviewed-on: https://go-review.googlesource.com/7791
Reviewed-by: Rob Pike <r@golang.org>
diff --git a/draw/gen.go b/draw/gen.go
index eccafee..a34432f 100644
--- a/draw/gen.go
+++ b/draw/gen.go
@@ -64,8 +64,14 @@
{"*image.RGBA", "image.Image"},
{"Image", "image.Image"},
}
- dTypes, sTypes []string
- sTypesForDType = map[string][]string{}
+ dTypes, sTypes []string
+ sTypesForDType = map[string][]string{}
+ subsampleRatios = []string{
+ "444",
+ "422",
+ "420",
+ "440",
+ }
)
func init() {
@@ -88,6 +94,7 @@
type data struct {
dType string
sType string
+ sratio string
receiver string
}
@@ -125,6 +132,15 @@
}
func expn(w *bytes.Buffer, code string, d *data) {
+ if d.sType == "*image.YCbCr" && d.sratio == "" {
+ for _, sratio := range subsampleRatios {
+ e := *d
+ e.sratio = sratio
+ expn(w, code, &e)
+ }
+ return
+ }
+
for _, line := range strings.Split(code, "\n") {
line = expnLine(line, d)
if line == ";" {
@@ -169,6 +185,8 @@
return prefix + d.dType + suffix
case "dTypeRN":
return prefix + relName(d.dType) + suffix
+ case "sratio":
+ return prefix + d.sratio + suffix
case "sType":
return prefix + d.sType + suffix
case "sTypeRN":
@@ -482,7 +500,11 @@
}
if dType != "" {
- lines = append(lines, expnLine(template, &data{dType: dType, sType: v}))
+ if v == "*image.YCbCr" {
+ lines = append(lines, expnSwitchYCbCr(dType, template))
+ } else {
+ lines = append(lines, expnLine(template, &data{dType: dType, sType: v}))
+ }
} else if !expandBoth {
lines = append(lines, expnLine(template, &data{dType: v}))
} else {
@@ -494,6 +516,22 @@
return strings.Join(lines, "\n")
}
+func expnSwitchYCbCr(dType, template string) string {
+ lines := []string{
+ "switch src.SubsampleRatio {",
+ "default:",
+ expnLine(template, &data{dType: dType, sType: "image.Image"}),
+ }
+ for _, sratio := range subsampleRatios {
+ lines = append(lines,
+ fmt.Sprintf("case image.YCbCrSubsampleRatio%s:", sratio),
+ expnLine(template, &data{dType: dType, sType: "*image.YCbCr", sratio: sratio}),
+ )
+ }
+ lines = append(lines, "}")
+ return strings.Join(lines, "\n")
+}
+
func split(s, sep string) (string, string) {
if i := strings.Index(s, sep); i >= 0 {
return strings.TrimSpace(s[:i]), strings.TrimSpace(s[i+len(sep):])
@@ -551,7 +589,7 @@
if !sr.In(src.Bounds()) {
z.scale_Image_Image(dst, dr, adr, src, sr)
} else {
- $switch z.scale_$dTypeRN_$sTypeRN(dst, dr, adr, src, sr)
+ $switch z.scale_$dTypeRN_$sTypeRN$sratio(dst, dr, adr, src, sr)
}
}
@@ -569,13 +607,13 @@
if !sr.In(src.Bounds()) {
z.transform_Image_Image(dst, dr, adr, &d2s, src, sr)
} else {
- $switch z.transform_$dTypeRN_$sTypeRN(dst, dr, adr, &d2s, src, sr)
+ $switch z.transform_$dTypeRN_$sTypeRN$sratio(dst, dr, adr, &d2s, src, sr)
}
}
`
codeNNScaleLeaf = `
- func (nnInterpolator) scale_$dTypeRN_$sTypeRN(dst $dType, dr, adr image.Rectangle, src $sType, sr image.Rectangle) {
+ func (nnInterpolator) scale_$dTypeRN_$sTypeRN$sratio(dst $dType, dr, adr image.Rectangle, src $sType, sr image.Rectangle) {
dw2 := uint64(dr.Dx()) * 2
dh2 := uint64(dr.Dy()) * 2
sw := uint64(sr.Dx())
@@ -594,7 +632,7 @@
`
codeNNTransformLeaf = `
- func (nnInterpolator) transform_$dTypeRN_$sTypeRN(dst $dType, dr, adr image.Rectangle, d2s *f64.Aff3, src $sType, sr image.Rectangle) {
+ func (nnInterpolator) transform_$dTypeRN_$sTypeRN$sratio(dst $dType, dr, adr image.Rectangle, d2s *f64.Aff3, src $sType, sr image.Rectangle) {
$preOuter
for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
dyf := float64(dr.Min.Y + int(dy)) + 0.5
@@ -615,7 +653,7 @@
`
codeABLScaleLeaf = `
- func (ablInterpolator) scale_$dTypeRN_$sTypeRN(dst $dType, dr, adr image.Rectangle, src $sType, sr image.Rectangle) {
+ func (ablInterpolator) scale_$dTypeRN_$sTypeRN$sratio(dst $dType, dr, adr image.Rectangle, src $sType, sr image.Rectangle) {
sw := int32(sr.Dx())
sh := int32(sr.Dy())
yscale := float64(sh) / float64(dr.Dy())
@@ -669,7 +707,7 @@
`
codeABLTransformLeaf = `
- func (ablInterpolator) transform_$dTypeRN_$sTypeRN(dst $dType, dr, adr image.Rectangle, d2s *f64.Aff3, src $sType, sr image.Rectangle) {
+ func (ablInterpolator) transform_$dTypeRN_$sTypeRN$sratio(dst $dType, dr, adr image.Rectangle, d2s *f64.Aff3, src $sType, sr image.Rectangle) {
$preOuter
for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
dyf := float64(dr.Min.Y + int(dy)) + 0.5
@@ -747,7 +785,7 @@
if !sr.In(src.Bounds()) {
z.scaleX_Image(tmp, src, sr)
} else {
- $switchS z.scaleX_$sTypeRN(tmp, src, sr)
+ $switchS z.scaleX_$sTypeRN$sratio(tmp, src, sr)
}
$switchD z.scaleY_$dTypeRN(dst, dr, adr, tmp)
@@ -777,13 +815,13 @@
if !sr.In(src.Bounds()) {
q.transform_Image_Image(dst, dr, adr, &d2s, src, sr, xscale, yscale)
} else {
- $switch q.transform_$dTypeRN_$sTypeRN(dst, dr, adr, &d2s, src, sr, xscale, yscale)
+ $switch q.transform_$dTypeRN_$sTypeRN$sratio(dst, dr, adr, &d2s, src, sr, xscale, yscale)
}
}
`
codeKernelScaleLeafX = `
- func (z *kernelScaler) scaleX_$sTypeRN(tmp [][4]float64, src $sType, sr image.Rectangle) {
+ func (z *kernelScaler) scaleX_$sTypeRN$sratio(tmp [][4]float64, src $sType, sr image.Rectangle) {
t := 0
for y := int32(0); y < z.sh; y++ {
for _, s := range z.horizontal.sources {
@@ -826,7 +864,7 @@
`
codeKernelTransformLeaf = `
- func (q *Kernel) transform_$dTypeRN_$sTypeRN(dst $dType, dr, adr image.Rectangle, d2s *f64.Aff3, src $sType, sr image.Rectangle, xscale, yscale float64) {
+ func (q *Kernel) transform_$dTypeRN_$sTypeRN$sratio(dst $dType, dr, adr image.Rectangle, d2s *f64.Aff3, src $sType, sr image.Rectangle, xscale, yscale float64) {
// When shrinking, broaden the effective kernel support so that we still
// visit every source pixel.
xHalfWidth, xKernelArgScale := q.Support, 1.0
diff --git a/draw/impl.go b/draw/impl.go
index cc0ed77..02eaabf 100644
--- a/draw/impl.go
+++ b/draw/impl.go
@@ -34,7 +34,18 @@
case *image.Uniform:
z.scale_RGBA_Uniform(dst, dr, adr, src, sr)
case *image.YCbCr:
- z.scale_RGBA_YCbCr(dst, dr, adr, src, sr)
+ switch src.SubsampleRatio {
+ default:
+ z.scale_RGBA_Image(dst, dr, adr, src, sr)
+ case image.YCbCrSubsampleRatio444:
+ z.scale_RGBA_YCbCr444(dst, dr, adr, src, sr)
+ case image.YCbCrSubsampleRatio422:
+ z.scale_RGBA_YCbCr422(dst, dr, adr, src, sr)
+ case image.YCbCrSubsampleRatio420:
+ z.scale_RGBA_YCbCr420(dst, dr, adr, src, sr)
+ case image.YCbCrSubsampleRatio440:
+ z.scale_RGBA_YCbCr440(dst, dr, adr, src, sr)
+ }
default:
z.scale_RGBA_Image(dst, dr, adr, src, sr)
}
@@ -73,7 +84,18 @@
case *image.Uniform:
z.transform_RGBA_Uniform(dst, dr, adr, &d2s, src, sr)
case *image.YCbCr:
- z.transform_RGBA_YCbCr(dst, dr, adr, &d2s, src, sr)
+ switch src.SubsampleRatio {
+ default:
+ z.transform_RGBA_Image(dst, dr, adr, &d2s, src, sr)
+ case image.YCbCrSubsampleRatio444:
+ z.transform_RGBA_YCbCr444(dst, dr, adr, &d2s, src, sr)
+ case image.YCbCrSubsampleRatio422:
+ z.transform_RGBA_YCbCr422(dst, dr, adr, &d2s, src, sr)
+ case image.YCbCrSubsampleRatio420:
+ z.transform_RGBA_YCbCr420(dst, dr, adr, &d2s, src, sr)
+ case image.YCbCrSubsampleRatio440:
+ z.transform_RGBA_YCbCr440(dst, dr, adr, &d2s, src, sr)
+ }
default:
z.transform_RGBA_Image(dst, dr, adr, &d2s, src, sr)
}
@@ -168,7 +190,64 @@
}
}
-func (nnInterpolator) scale_RGBA_YCbCr(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
+func (nnInterpolator) scale_RGBA_YCbCr444(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
+ dw2 := uint64(dr.Dx()) * 2
+ dh2 := uint64(dr.Dy()) * 2
+ sw := uint64(sr.Dx())
+ sh := uint64(sr.Dy())
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ sy := (2*uint64(dy) + 1) * sh / dh2
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ sx := (2*uint64(dx) + 1) * sw / dw2
+ pr, pg, pb, pa := src.At(sr.Min.X+int(sx), sr.Min.Y+int(sy)).RGBA()
+ dst.Pix[d+0] = uint8(uint32(pr) >> 8)
+ dst.Pix[d+1] = uint8(uint32(pg) >> 8)
+ dst.Pix[d+2] = uint8(uint32(pb) >> 8)
+ dst.Pix[d+3] = uint8(uint32(pa) >> 8)
+ }
+ }
+}
+
+func (nnInterpolator) scale_RGBA_YCbCr422(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
+ dw2 := uint64(dr.Dx()) * 2
+ dh2 := uint64(dr.Dy()) * 2
+ sw := uint64(sr.Dx())
+ sh := uint64(sr.Dy())
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ sy := (2*uint64(dy) + 1) * sh / dh2
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ sx := (2*uint64(dx) + 1) * sw / dw2
+ pr, pg, pb, pa := src.At(sr.Min.X+int(sx), sr.Min.Y+int(sy)).RGBA()
+ dst.Pix[d+0] = uint8(uint32(pr) >> 8)
+ dst.Pix[d+1] = uint8(uint32(pg) >> 8)
+ dst.Pix[d+2] = uint8(uint32(pb) >> 8)
+ dst.Pix[d+3] = uint8(uint32(pa) >> 8)
+ }
+ }
+}
+
+func (nnInterpolator) scale_RGBA_YCbCr420(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
+ dw2 := uint64(dr.Dx()) * 2
+ dh2 := uint64(dr.Dy()) * 2
+ sw := uint64(sr.Dx())
+ sh := uint64(sr.Dy())
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ sy := (2*uint64(dy) + 1) * sh / dh2
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ sx := (2*uint64(dx) + 1) * sw / dw2
+ pr, pg, pb, pa := src.At(sr.Min.X+int(sx), sr.Min.Y+int(sy)).RGBA()
+ dst.Pix[d+0] = uint8(uint32(pr) >> 8)
+ dst.Pix[d+1] = uint8(uint32(pg) >> 8)
+ dst.Pix[d+2] = uint8(uint32(pb) >> 8)
+ dst.Pix[d+3] = uint8(uint32(pa) >> 8)
+ }
+ }
+}
+
+func (nnInterpolator) scale_RGBA_YCbCr440(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
dw2 := uint64(dr.Dx()) * 2
dh2 := uint64(dr.Dy()) * 2
sw := uint64(sr.Dx())
@@ -317,7 +396,70 @@
}
}
-func (nnInterpolator) transform_RGBA_YCbCr(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
+func (nnInterpolator) transform_RGBA_YCbCr444(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx0 := int(math.Floor(d2s[0]*dxf + d2s[1]*dyf + d2s[2]))
+ sy0 := int(math.Floor(d2s[3]*dxf + d2s[4]*dyf + d2s[5]))
+ if !(image.Point{sx0, sy0}).In(sr) {
+ continue
+ }
+ pr, pg, pb, pa := src.At(sx0, sy0).RGBA()
+ dst.Pix[d+0] = uint8(uint32(pr) >> 8)
+ dst.Pix[d+1] = uint8(uint32(pg) >> 8)
+ dst.Pix[d+2] = uint8(uint32(pb) >> 8)
+ dst.Pix[d+3] = uint8(uint32(pa) >> 8)
+ }
+ }
+}
+
+func (nnInterpolator) transform_RGBA_YCbCr422(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx0 := int(math.Floor(d2s[0]*dxf + d2s[1]*dyf + d2s[2]))
+ sy0 := int(math.Floor(d2s[3]*dxf + d2s[4]*dyf + d2s[5]))
+ if !(image.Point{sx0, sy0}).In(sr) {
+ continue
+ }
+ pr, pg, pb, pa := src.At(sx0, sy0).RGBA()
+ dst.Pix[d+0] = uint8(uint32(pr) >> 8)
+ dst.Pix[d+1] = uint8(uint32(pg) >> 8)
+ dst.Pix[d+2] = uint8(uint32(pb) >> 8)
+ dst.Pix[d+3] = uint8(uint32(pa) >> 8)
+ }
+ }
+}
+
+func (nnInterpolator) transform_RGBA_YCbCr420(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx0 := int(math.Floor(d2s[0]*dxf + d2s[1]*dyf + d2s[2]))
+ sy0 := int(math.Floor(d2s[3]*dxf + d2s[4]*dyf + d2s[5]))
+ if !(image.Point{sx0, sy0}).In(sr) {
+ continue
+ }
+ pr, pg, pb, pa := src.At(sx0, sy0).RGBA()
+ dst.Pix[d+0] = uint8(uint32(pr) >> 8)
+ dst.Pix[d+1] = uint8(uint32(pg) >> 8)
+ dst.Pix[d+2] = uint8(uint32(pb) >> 8)
+ dst.Pix[d+3] = uint8(uint32(pa) >> 8)
+ }
+ }
+}
+
+func (nnInterpolator) transform_RGBA_YCbCr440(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
dyf := float64(dr.Min.Y+int(dy)) + 0.5
d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
@@ -406,7 +548,18 @@
case *image.Uniform:
z.scale_RGBA_Uniform(dst, dr, adr, src, sr)
case *image.YCbCr:
- z.scale_RGBA_YCbCr(dst, dr, adr, src, sr)
+ switch src.SubsampleRatio {
+ default:
+ z.scale_RGBA_Image(dst, dr, adr, src, sr)
+ case image.YCbCrSubsampleRatio444:
+ z.scale_RGBA_YCbCr444(dst, dr, adr, src, sr)
+ case image.YCbCrSubsampleRatio422:
+ z.scale_RGBA_YCbCr422(dst, dr, adr, src, sr)
+ case image.YCbCrSubsampleRatio420:
+ z.scale_RGBA_YCbCr420(dst, dr, adr, src, sr)
+ case image.YCbCrSubsampleRatio440:
+ z.scale_RGBA_YCbCr440(dst, dr, adr, src, sr)
+ }
default:
z.scale_RGBA_Image(dst, dr, adr, src, sr)
}
@@ -445,7 +598,18 @@
case *image.Uniform:
z.transform_RGBA_Uniform(dst, dr, adr, &d2s, src, sr)
case *image.YCbCr:
- z.transform_RGBA_YCbCr(dst, dr, adr, &d2s, src, sr)
+ switch src.SubsampleRatio {
+ default:
+ z.transform_RGBA_Image(dst, dr, adr, &d2s, src, sr)
+ case image.YCbCrSubsampleRatio444:
+ z.transform_RGBA_YCbCr444(dst, dr, adr, &d2s, src, sr)
+ case image.YCbCrSubsampleRatio422:
+ z.transform_RGBA_YCbCr422(dst, dr, adr, &d2s, src, sr)
+ case image.YCbCrSubsampleRatio420:
+ z.transform_RGBA_YCbCr420(dst, dr, adr, &d2s, src, sr)
+ case image.YCbCrSubsampleRatio440:
+ z.transform_RGBA_YCbCr440(dst, dr, adr, &d2s, src, sr)
+ }
default:
z.transform_RGBA_Image(dst, dr, adr, &d2s, src, sr)
}
@@ -774,7 +938,244 @@
}
}
-func (ablInterpolator) scale_RGBA_YCbCr(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
+func (ablInterpolator) scale_RGBA_YCbCr444(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
+ sw := int32(sr.Dx())
+ sh := int32(sr.Dy())
+ yscale := float64(sh) / float64(dr.Dy())
+ xscale := float64(sw) / float64(dr.Dx())
+ swMinus1, shMinus1 := sw-1, sh-1
+
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ sy := (float64(dy)+0.5)*yscale - 0.5
+ // If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+ // we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+ // sx, below.
+ sy0 := int32(sy)
+ yFrac0 := sy - float64(sy0)
+ yFrac1 := 1 - yFrac0
+ sy1 := sy0 + 1
+ if sy < 0 {
+ sy0, sy1 = 0, 0
+ yFrac0, yFrac1 = 0, 1
+ } else if sy1 > shMinus1 {
+ sy0, sy1 = shMinus1, shMinus1
+ yFrac0, yFrac1 = 1, 0
+ }
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ sx := (float64(dx)+0.5)*xscale - 0.5
+ sx0 := int32(sx)
+ xFrac0 := sx - float64(sx0)
+ xFrac1 := 1 - xFrac0
+ sx1 := sx0 + 1
+ if sx < 0 {
+ sx0, sx1 = 0, 0
+ xFrac0, xFrac1 = 0, 1
+ } else if sx1 > swMinus1 {
+ sx0, sx1 = swMinus1, swMinus1
+ xFrac0, xFrac1 = 1, 0
+ }
+
+ s00ru, s00gu, s00bu, s00au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy0)).RGBA()
+ s00r := float64(s00ru)
+ s00g := float64(s00gu)
+ s00b := float64(s00bu)
+ s00a := float64(s00au)
+ s10ru, s10gu, s10bu, s10au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy0)).RGBA()
+ s10r := float64(s10ru)
+ s10g := float64(s10gu)
+ s10b := float64(s10bu)
+ s10a := float64(s10au)
+ s10r = xFrac1*s00r + xFrac0*s10r
+ s10g = xFrac1*s00g + xFrac0*s10g
+ s10b = xFrac1*s00b + xFrac0*s10b
+ s10a = xFrac1*s00a + xFrac0*s10a
+ s01ru, s01gu, s01bu, s01au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy1)).RGBA()
+ s01r := float64(s01ru)
+ s01g := float64(s01gu)
+ s01b := float64(s01bu)
+ s01a := float64(s01au)
+ s11ru, s11gu, s11bu, s11au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy1)).RGBA()
+ s11r := float64(s11ru)
+ s11g := float64(s11gu)
+ s11b := float64(s11bu)
+ s11a := float64(s11au)
+ s11r = xFrac1*s01r + xFrac0*s11r
+ s11g = xFrac1*s01g + xFrac0*s11g
+ s11b = xFrac1*s01b + xFrac0*s11b
+ s11a = xFrac1*s01a + xFrac0*s11a
+ s11r = yFrac1*s10r + yFrac0*s11r
+ s11g = yFrac1*s10g + yFrac0*s11g
+ s11b = yFrac1*s10b + yFrac0*s11b
+ s11a = yFrac1*s10a + yFrac0*s11a
+ dst.Pix[d+0] = uint8(uint32(s11r) >> 8)
+ dst.Pix[d+1] = uint8(uint32(s11g) >> 8)
+ dst.Pix[d+2] = uint8(uint32(s11b) >> 8)
+ dst.Pix[d+3] = uint8(uint32(s11a) >> 8)
+ }
+ }
+}
+
+func (ablInterpolator) scale_RGBA_YCbCr422(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
+ sw := int32(sr.Dx())
+ sh := int32(sr.Dy())
+ yscale := float64(sh) / float64(dr.Dy())
+ xscale := float64(sw) / float64(dr.Dx())
+ swMinus1, shMinus1 := sw-1, sh-1
+
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ sy := (float64(dy)+0.5)*yscale - 0.5
+ // If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+ // we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+ // sx, below.
+ sy0 := int32(sy)
+ yFrac0 := sy - float64(sy0)
+ yFrac1 := 1 - yFrac0
+ sy1 := sy0 + 1
+ if sy < 0 {
+ sy0, sy1 = 0, 0
+ yFrac0, yFrac1 = 0, 1
+ } else if sy1 > shMinus1 {
+ sy0, sy1 = shMinus1, shMinus1
+ yFrac0, yFrac1 = 1, 0
+ }
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ sx := (float64(dx)+0.5)*xscale - 0.5
+ sx0 := int32(sx)
+ xFrac0 := sx - float64(sx0)
+ xFrac1 := 1 - xFrac0
+ sx1 := sx0 + 1
+ if sx < 0 {
+ sx0, sx1 = 0, 0
+ xFrac0, xFrac1 = 0, 1
+ } else if sx1 > swMinus1 {
+ sx0, sx1 = swMinus1, swMinus1
+ xFrac0, xFrac1 = 1, 0
+ }
+
+ s00ru, s00gu, s00bu, s00au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy0)).RGBA()
+ s00r := float64(s00ru)
+ s00g := float64(s00gu)
+ s00b := float64(s00bu)
+ s00a := float64(s00au)
+ s10ru, s10gu, s10bu, s10au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy0)).RGBA()
+ s10r := float64(s10ru)
+ s10g := float64(s10gu)
+ s10b := float64(s10bu)
+ s10a := float64(s10au)
+ s10r = xFrac1*s00r + xFrac0*s10r
+ s10g = xFrac1*s00g + xFrac0*s10g
+ s10b = xFrac1*s00b + xFrac0*s10b
+ s10a = xFrac1*s00a + xFrac0*s10a
+ s01ru, s01gu, s01bu, s01au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy1)).RGBA()
+ s01r := float64(s01ru)
+ s01g := float64(s01gu)
+ s01b := float64(s01bu)
+ s01a := float64(s01au)
+ s11ru, s11gu, s11bu, s11au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy1)).RGBA()
+ s11r := float64(s11ru)
+ s11g := float64(s11gu)
+ s11b := float64(s11bu)
+ s11a := float64(s11au)
+ s11r = xFrac1*s01r + xFrac0*s11r
+ s11g = xFrac1*s01g + xFrac0*s11g
+ s11b = xFrac1*s01b + xFrac0*s11b
+ s11a = xFrac1*s01a + xFrac0*s11a
+ s11r = yFrac1*s10r + yFrac0*s11r
+ s11g = yFrac1*s10g + yFrac0*s11g
+ s11b = yFrac1*s10b + yFrac0*s11b
+ s11a = yFrac1*s10a + yFrac0*s11a
+ dst.Pix[d+0] = uint8(uint32(s11r) >> 8)
+ dst.Pix[d+1] = uint8(uint32(s11g) >> 8)
+ dst.Pix[d+2] = uint8(uint32(s11b) >> 8)
+ dst.Pix[d+3] = uint8(uint32(s11a) >> 8)
+ }
+ }
+}
+
+func (ablInterpolator) scale_RGBA_YCbCr420(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
+ sw := int32(sr.Dx())
+ sh := int32(sr.Dy())
+ yscale := float64(sh) / float64(dr.Dy())
+ xscale := float64(sw) / float64(dr.Dx())
+ swMinus1, shMinus1 := sw-1, sh-1
+
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ sy := (float64(dy)+0.5)*yscale - 0.5
+ // If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+ // we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+ // sx, below.
+ sy0 := int32(sy)
+ yFrac0 := sy - float64(sy0)
+ yFrac1 := 1 - yFrac0
+ sy1 := sy0 + 1
+ if sy < 0 {
+ sy0, sy1 = 0, 0
+ yFrac0, yFrac1 = 0, 1
+ } else if sy1 > shMinus1 {
+ sy0, sy1 = shMinus1, shMinus1
+ yFrac0, yFrac1 = 1, 0
+ }
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ sx := (float64(dx)+0.5)*xscale - 0.5
+ sx0 := int32(sx)
+ xFrac0 := sx - float64(sx0)
+ xFrac1 := 1 - xFrac0
+ sx1 := sx0 + 1
+ if sx < 0 {
+ sx0, sx1 = 0, 0
+ xFrac0, xFrac1 = 0, 1
+ } else if sx1 > swMinus1 {
+ sx0, sx1 = swMinus1, swMinus1
+ xFrac0, xFrac1 = 1, 0
+ }
+
+ s00ru, s00gu, s00bu, s00au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy0)).RGBA()
+ s00r := float64(s00ru)
+ s00g := float64(s00gu)
+ s00b := float64(s00bu)
+ s00a := float64(s00au)
+ s10ru, s10gu, s10bu, s10au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy0)).RGBA()
+ s10r := float64(s10ru)
+ s10g := float64(s10gu)
+ s10b := float64(s10bu)
+ s10a := float64(s10au)
+ s10r = xFrac1*s00r + xFrac0*s10r
+ s10g = xFrac1*s00g + xFrac0*s10g
+ s10b = xFrac1*s00b + xFrac0*s10b
+ s10a = xFrac1*s00a + xFrac0*s10a
+ s01ru, s01gu, s01bu, s01au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy1)).RGBA()
+ s01r := float64(s01ru)
+ s01g := float64(s01gu)
+ s01b := float64(s01bu)
+ s01a := float64(s01au)
+ s11ru, s11gu, s11bu, s11au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy1)).RGBA()
+ s11r := float64(s11ru)
+ s11g := float64(s11gu)
+ s11b := float64(s11bu)
+ s11a := float64(s11au)
+ s11r = xFrac1*s01r + xFrac0*s11r
+ s11g = xFrac1*s01g + xFrac0*s11g
+ s11b = xFrac1*s01b + xFrac0*s11b
+ s11a = xFrac1*s01a + xFrac0*s11a
+ s11r = yFrac1*s10r + yFrac0*s11r
+ s11g = yFrac1*s10g + yFrac0*s11g
+ s11b = yFrac1*s10b + yFrac0*s11b
+ s11a = yFrac1*s10a + yFrac0*s11a
+ dst.Pix[d+0] = uint8(uint32(s11r) >> 8)
+ dst.Pix[d+1] = uint8(uint32(s11g) >> 8)
+ dst.Pix[d+2] = uint8(uint32(s11b) >> 8)
+ dst.Pix[d+3] = uint8(uint32(s11a) >> 8)
+ }
+ }
+}
+
+func (ablInterpolator) scale_RGBA_YCbCr440(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle) {
sw := int32(sr.Dx())
sh := int32(sr.Dy())
yscale := float64(sh) / float64(dr.Dy())
@@ -1337,7 +1738,250 @@
}
}
-func (ablInterpolator) transform_RGBA_YCbCr(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
+func (ablInterpolator) transform_RGBA_YCbCr444(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+ sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+ if !(image.Point{int(math.Floor(sx)), int(math.Floor(sy))}).In(sr) {
+ continue
+ }
+
+ sx -= 0.5
+ sxf := math.Floor(sx)
+ xFrac0 := sx - sxf
+ xFrac1 := 1 - xFrac0
+ sx0 := int(sxf)
+ sx1 := sx0 + 1
+ if sx0 < sr.Min.X {
+ sx0, sx1 = sr.Min.X, sr.Min.X
+ xFrac0, xFrac1 = 0, 1
+ } else if sx1 >= sr.Max.X {
+ sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+ xFrac0, xFrac1 = 1, 0
+ }
+
+ sy -= 0.5
+ syf := math.Floor(sy)
+ yFrac0 := sy - syf
+ yFrac1 := 1 - yFrac0
+ sy0 := int(syf)
+ sy1 := sy0 + 1
+ if sy0 < sr.Min.Y {
+ sy0, sy1 = sr.Min.Y, sr.Min.Y
+ yFrac0, yFrac1 = 0, 1
+ } else if sy1 >= sr.Max.Y {
+ sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+ yFrac0, yFrac1 = 1, 0
+ }
+
+ s00ru, s00gu, s00bu, s00au := src.At(sx0, sy0).RGBA()
+ s00r := float64(s00ru)
+ s00g := float64(s00gu)
+ s00b := float64(s00bu)
+ s00a := float64(s00au)
+ s10ru, s10gu, s10bu, s10au := src.At(sx1, sy0).RGBA()
+ s10r := float64(s10ru)
+ s10g := float64(s10gu)
+ s10b := float64(s10bu)
+ s10a := float64(s10au)
+ s10r = xFrac1*s00r + xFrac0*s10r
+ s10g = xFrac1*s00g + xFrac0*s10g
+ s10b = xFrac1*s00b + xFrac0*s10b
+ s10a = xFrac1*s00a + xFrac0*s10a
+ s01ru, s01gu, s01bu, s01au := src.At(sx0, sy1).RGBA()
+ s01r := float64(s01ru)
+ s01g := float64(s01gu)
+ s01b := float64(s01bu)
+ s01a := float64(s01au)
+ s11ru, s11gu, s11bu, s11au := src.At(sx1, sy1).RGBA()
+ s11r := float64(s11ru)
+ s11g := float64(s11gu)
+ s11b := float64(s11bu)
+ s11a := float64(s11au)
+ s11r = xFrac1*s01r + xFrac0*s11r
+ s11g = xFrac1*s01g + xFrac0*s11g
+ s11b = xFrac1*s01b + xFrac0*s11b
+ s11a = xFrac1*s01a + xFrac0*s11a
+ s11r = yFrac1*s10r + yFrac0*s11r
+ s11g = yFrac1*s10g + yFrac0*s11g
+ s11b = yFrac1*s10b + yFrac0*s11b
+ s11a = yFrac1*s10a + yFrac0*s11a
+ dst.Pix[d+0] = uint8(uint32(s11r) >> 8)
+ dst.Pix[d+1] = uint8(uint32(s11g) >> 8)
+ dst.Pix[d+2] = uint8(uint32(s11b) >> 8)
+ dst.Pix[d+3] = uint8(uint32(s11a) >> 8)
+ }
+ }
+}
+
+func (ablInterpolator) transform_RGBA_YCbCr422(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+ sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+ if !(image.Point{int(math.Floor(sx)), int(math.Floor(sy))}).In(sr) {
+ continue
+ }
+
+ sx -= 0.5
+ sxf := math.Floor(sx)
+ xFrac0 := sx - sxf
+ xFrac1 := 1 - xFrac0
+ sx0 := int(sxf)
+ sx1 := sx0 + 1
+ if sx0 < sr.Min.X {
+ sx0, sx1 = sr.Min.X, sr.Min.X
+ xFrac0, xFrac1 = 0, 1
+ } else if sx1 >= sr.Max.X {
+ sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+ xFrac0, xFrac1 = 1, 0
+ }
+
+ sy -= 0.5
+ syf := math.Floor(sy)
+ yFrac0 := sy - syf
+ yFrac1 := 1 - yFrac0
+ sy0 := int(syf)
+ sy1 := sy0 + 1
+ if sy0 < sr.Min.Y {
+ sy0, sy1 = sr.Min.Y, sr.Min.Y
+ yFrac0, yFrac1 = 0, 1
+ } else if sy1 >= sr.Max.Y {
+ sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+ yFrac0, yFrac1 = 1, 0
+ }
+
+ s00ru, s00gu, s00bu, s00au := src.At(sx0, sy0).RGBA()
+ s00r := float64(s00ru)
+ s00g := float64(s00gu)
+ s00b := float64(s00bu)
+ s00a := float64(s00au)
+ s10ru, s10gu, s10bu, s10au := src.At(sx1, sy0).RGBA()
+ s10r := float64(s10ru)
+ s10g := float64(s10gu)
+ s10b := float64(s10bu)
+ s10a := float64(s10au)
+ s10r = xFrac1*s00r + xFrac0*s10r
+ s10g = xFrac1*s00g + xFrac0*s10g
+ s10b = xFrac1*s00b + xFrac0*s10b
+ s10a = xFrac1*s00a + xFrac0*s10a
+ s01ru, s01gu, s01bu, s01au := src.At(sx0, sy1).RGBA()
+ s01r := float64(s01ru)
+ s01g := float64(s01gu)
+ s01b := float64(s01bu)
+ s01a := float64(s01au)
+ s11ru, s11gu, s11bu, s11au := src.At(sx1, sy1).RGBA()
+ s11r := float64(s11ru)
+ s11g := float64(s11gu)
+ s11b := float64(s11bu)
+ s11a := float64(s11au)
+ s11r = xFrac1*s01r + xFrac0*s11r
+ s11g = xFrac1*s01g + xFrac0*s11g
+ s11b = xFrac1*s01b + xFrac0*s11b
+ s11a = xFrac1*s01a + xFrac0*s11a
+ s11r = yFrac1*s10r + yFrac0*s11r
+ s11g = yFrac1*s10g + yFrac0*s11g
+ s11b = yFrac1*s10b + yFrac0*s11b
+ s11a = yFrac1*s10a + yFrac0*s11a
+ dst.Pix[d+0] = uint8(uint32(s11r) >> 8)
+ dst.Pix[d+1] = uint8(uint32(s11g) >> 8)
+ dst.Pix[d+2] = uint8(uint32(s11b) >> 8)
+ dst.Pix[d+3] = uint8(uint32(s11a) >> 8)
+ }
+ }
+}
+
+func (ablInterpolator) transform_RGBA_YCbCr420(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+ sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+ if !(image.Point{int(math.Floor(sx)), int(math.Floor(sy))}).In(sr) {
+ continue
+ }
+
+ sx -= 0.5
+ sxf := math.Floor(sx)
+ xFrac0 := sx - sxf
+ xFrac1 := 1 - xFrac0
+ sx0 := int(sxf)
+ sx1 := sx0 + 1
+ if sx0 < sr.Min.X {
+ sx0, sx1 = sr.Min.X, sr.Min.X
+ xFrac0, xFrac1 = 0, 1
+ } else if sx1 >= sr.Max.X {
+ sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+ xFrac0, xFrac1 = 1, 0
+ }
+
+ sy -= 0.5
+ syf := math.Floor(sy)
+ yFrac0 := sy - syf
+ yFrac1 := 1 - yFrac0
+ sy0 := int(syf)
+ sy1 := sy0 + 1
+ if sy0 < sr.Min.Y {
+ sy0, sy1 = sr.Min.Y, sr.Min.Y
+ yFrac0, yFrac1 = 0, 1
+ } else if sy1 >= sr.Max.Y {
+ sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+ yFrac0, yFrac1 = 1, 0
+ }
+
+ s00ru, s00gu, s00bu, s00au := src.At(sx0, sy0).RGBA()
+ s00r := float64(s00ru)
+ s00g := float64(s00gu)
+ s00b := float64(s00bu)
+ s00a := float64(s00au)
+ s10ru, s10gu, s10bu, s10au := src.At(sx1, sy0).RGBA()
+ s10r := float64(s10ru)
+ s10g := float64(s10gu)
+ s10b := float64(s10bu)
+ s10a := float64(s10au)
+ s10r = xFrac1*s00r + xFrac0*s10r
+ s10g = xFrac1*s00g + xFrac0*s10g
+ s10b = xFrac1*s00b + xFrac0*s10b
+ s10a = xFrac1*s00a + xFrac0*s10a
+ s01ru, s01gu, s01bu, s01au := src.At(sx0, sy1).RGBA()
+ s01r := float64(s01ru)
+ s01g := float64(s01gu)
+ s01b := float64(s01bu)
+ s01a := float64(s01au)
+ s11ru, s11gu, s11bu, s11au := src.At(sx1, sy1).RGBA()
+ s11r := float64(s11ru)
+ s11g := float64(s11gu)
+ s11b := float64(s11bu)
+ s11a := float64(s11au)
+ s11r = xFrac1*s01r + xFrac0*s11r
+ s11g = xFrac1*s01g + xFrac0*s11g
+ s11b = xFrac1*s01b + xFrac0*s11b
+ s11a = xFrac1*s01a + xFrac0*s11a
+ s11r = yFrac1*s10r + yFrac0*s11r
+ s11g = yFrac1*s10g + yFrac0*s11g
+ s11b = yFrac1*s10b + yFrac0*s11b
+ s11a = yFrac1*s10a + yFrac0*s11a
+ dst.Pix[d+0] = uint8(uint32(s11r) >> 8)
+ dst.Pix[d+1] = uint8(uint32(s11g) >> 8)
+ dst.Pix[d+2] = uint8(uint32(s11b) >> 8)
+ dst.Pix[d+3] = uint8(uint32(s11a) >> 8)
+ }
+ }
+}
+
+func (ablInterpolator) transform_RGBA_YCbCr440(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle) {
for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
dyf := float64(dr.Min.Y+int(dy)) + 0.5
d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
@@ -1614,7 +2258,18 @@
case *image.Uniform:
z.scaleX_Uniform(tmp, src, sr)
case *image.YCbCr:
- z.scaleX_YCbCr(tmp, src, sr)
+ switch src.SubsampleRatio {
+ default:
+ z.scaleX_Image(tmp, src, sr)
+ case image.YCbCrSubsampleRatio444:
+ z.scaleX_YCbCr444(tmp, src, sr)
+ case image.YCbCrSubsampleRatio422:
+ z.scaleX_YCbCr422(tmp, src, sr)
+ case image.YCbCrSubsampleRatio420:
+ z.scaleX_YCbCr420(tmp, src, sr)
+ case image.YCbCrSubsampleRatio440:
+ z.scaleX_YCbCr440(tmp, src, sr)
+ }
default:
z.scaleX_Image(tmp, src, sr)
}
@@ -1664,7 +2319,18 @@
case *image.Uniform:
q.transform_RGBA_Uniform(dst, dr, adr, &d2s, src, sr, xscale, yscale)
case *image.YCbCr:
- q.transform_RGBA_YCbCr(dst, dr, adr, &d2s, src, sr, xscale, yscale)
+ switch src.SubsampleRatio {
+ default:
+ q.transform_RGBA_Image(dst, dr, adr, &d2s, src, sr, xscale, yscale)
+ case image.YCbCrSubsampleRatio444:
+ q.transform_RGBA_YCbCr444(dst, dr, adr, &d2s, src, sr, xscale, yscale)
+ case image.YCbCrSubsampleRatio422:
+ q.transform_RGBA_YCbCr422(dst, dr, adr, &d2s, src, sr, xscale, yscale)
+ case image.YCbCrSubsampleRatio420:
+ q.transform_RGBA_YCbCr420(dst, dr, adr, &d2s, src, sr, xscale, yscale)
+ case image.YCbCrSubsampleRatio440:
+ q.transform_RGBA_YCbCr440(dst, dr, adr, &d2s, src, sr, xscale, yscale)
+ }
default:
q.transform_RGBA_Image(dst, dr, adr, &d2s, src, sr, xscale, yscale)
}
@@ -1772,7 +2438,76 @@
}
}
-func (z *kernelScaler) scaleX_YCbCr(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle) {
+func (z *kernelScaler) scaleX_YCbCr444(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle) {
+ t := 0
+ for y := int32(0); y < z.sh; y++ {
+ for _, s := range z.horizontal.sources {
+ var pr, pg, pb, pa float64
+ for _, c := range z.horizontal.contribs[s.i:s.j] {
+ pru, pgu, pbu, pau := src.At(sr.Min.X+int(c.coord), sr.Min.Y+int(y)).RGBA()
+ pr += float64(pru) * c.weight
+ pg += float64(pgu) * c.weight
+ pb += float64(pbu) * c.weight
+ pa += float64(pau) * c.weight
+ }
+ tmp[t] = [4]float64{
+ pr * s.invTotalWeightFFFF,
+ pg * s.invTotalWeightFFFF,
+ pb * s.invTotalWeightFFFF,
+ pa * s.invTotalWeightFFFF,
+ }
+ t++
+ }
+ }
+}
+
+func (z *kernelScaler) scaleX_YCbCr422(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle) {
+ t := 0
+ for y := int32(0); y < z.sh; y++ {
+ for _, s := range z.horizontal.sources {
+ var pr, pg, pb, pa float64
+ for _, c := range z.horizontal.contribs[s.i:s.j] {
+ pru, pgu, pbu, pau := src.At(sr.Min.X+int(c.coord), sr.Min.Y+int(y)).RGBA()
+ pr += float64(pru) * c.weight
+ pg += float64(pgu) * c.weight
+ pb += float64(pbu) * c.weight
+ pa += float64(pau) * c.weight
+ }
+ tmp[t] = [4]float64{
+ pr * s.invTotalWeightFFFF,
+ pg * s.invTotalWeightFFFF,
+ pb * s.invTotalWeightFFFF,
+ pa * s.invTotalWeightFFFF,
+ }
+ t++
+ }
+ }
+}
+
+func (z *kernelScaler) scaleX_YCbCr420(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle) {
+ t := 0
+ for y := int32(0); y < z.sh; y++ {
+ for _, s := range z.horizontal.sources {
+ var pr, pg, pb, pa float64
+ for _, c := range z.horizontal.contribs[s.i:s.j] {
+ pru, pgu, pbu, pau := src.At(sr.Min.X+int(c.coord), sr.Min.Y+int(y)).RGBA()
+ pr += float64(pru) * c.weight
+ pg += float64(pgu) * c.weight
+ pb += float64(pbu) * c.weight
+ pa += float64(pau) * c.weight
+ }
+ tmp[t] = [4]float64{
+ pr * s.invTotalWeightFFFF,
+ pg * s.invTotalWeightFFFF,
+ pb * s.invTotalWeightFFFF,
+ pa * s.invTotalWeightFFFF,
+ }
+ t++
+ }
+ }
+}
+
+func (z *kernelScaler) scaleX_YCbCr440(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle) {
t := 0
for y := int32(0); y < z.sh; y++ {
for _, s := range z.horizontal.sources {
@@ -2240,7 +2975,289 @@
}
}
-func (q *Kernel) transform_RGBA_YCbCr(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, xscale, yscale float64) {
+func (q *Kernel) transform_RGBA_YCbCr444(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, xscale, yscale float64) {
+ // When shrinking, broaden the effective kernel support so that we still
+ // visit every source pixel.
+ xHalfWidth, xKernelArgScale := q.Support, 1.0
+ if xscale > 1 {
+ xHalfWidth *= xscale
+ xKernelArgScale = 1 / xscale
+ }
+ yHalfWidth, yKernelArgScale := q.Support, 1.0
+ if yscale > 1 {
+ yHalfWidth *= yscale
+ yKernelArgScale = 1 / yscale
+ }
+
+ xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+ yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+ sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+ if !(image.Point{int(math.Floor(sx)), int(math.Floor(sy))}).In(sr) {
+ continue
+ }
+
+ sx -= 0.5
+ ix := int(math.Floor(sx - xHalfWidth))
+ if ix < sr.Min.X {
+ ix = sr.Min.X
+ }
+ jx := int(math.Ceil(sx + xHalfWidth))
+ if jx > sr.Max.X {
+ jx = sr.Max.X
+ }
+
+ totalXWeight := 0.0
+ for kx := ix; kx < jx; kx++ {
+ xWeight := 0.0
+ if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+ xWeight = q.At(t)
+ }
+ xWeights[kx-ix] = xWeight
+ totalXWeight += xWeight
+ }
+ for x := range xWeights[:jx-ix] {
+ xWeights[x] /= totalXWeight
+ }
+
+ sy -= 0.5
+ iy := int(math.Floor(sy - yHalfWidth))
+ if iy < sr.Min.Y {
+ iy = sr.Min.Y
+ }
+ jy := int(math.Ceil(sy + yHalfWidth))
+ if jy > sr.Max.Y {
+ jy = sr.Max.Y
+ }
+
+ totalYWeight := 0.0
+ for ky := iy; ky < jy; ky++ {
+ yWeight := 0.0
+ if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+ yWeight = q.At(t)
+ }
+ yWeights[ky-iy] = yWeight
+ totalYWeight += yWeight
+ }
+ for y := range yWeights[:jy-iy] {
+ yWeights[y] /= totalYWeight
+ }
+
+ var pr, pg, pb, pa float64
+ for ky := iy; ky < jy; ky++ {
+ yWeight := yWeights[ky-iy]
+ for kx := ix; kx < jx; kx++ {
+ pru, pgu, pbu, pau := src.At(kx, ky).RGBA()
+ pr += float64(pru) * xWeights[kx-ix] * yWeight
+ pg += float64(pgu) * xWeights[kx-ix] * yWeight
+ pb += float64(pbu) * xWeights[kx-ix] * yWeight
+ pa += float64(pau) * xWeights[kx-ix] * yWeight
+ }
+ }
+ dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+ dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+ dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+ dst.Pix[d+3] = uint8(fffftou(pa) >> 8)
+ }
+ }
+}
+
+func (q *Kernel) transform_RGBA_YCbCr422(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, xscale, yscale float64) {
+ // When shrinking, broaden the effective kernel support so that we still
+ // visit every source pixel.
+ xHalfWidth, xKernelArgScale := q.Support, 1.0
+ if xscale > 1 {
+ xHalfWidth *= xscale
+ xKernelArgScale = 1 / xscale
+ }
+ yHalfWidth, yKernelArgScale := q.Support, 1.0
+ if yscale > 1 {
+ yHalfWidth *= yscale
+ yKernelArgScale = 1 / yscale
+ }
+
+ xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+ yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+ sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+ if !(image.Point{int(math.Floor(sx)), int(math.Floor(sy))}).In(sr) {
+ continue
+ }
+
+ sx -= 0.5
+ ix := int(math.Floor(sx - xHalfWidth))
+ if ix < sr.Min.X {
+ ix = sr.Min.X
+ }
+ jx := int(math.Ceil(sx + xHalfWidth))
+ if jx > sr.Max.X {
+ jx = sr.Max.X
+ }
+
+ totalXWeight := 0.0
+ for kx := ix; kx < jx; kx++ {
+ xWeight := 0.0
+ if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+ xWeight = q.At(t)
+ }
+ xWeights[kx-ix] = xWeight
+ totalXWeight += xWeight
+ }
+ for x := range xWeights[:jx-ix] {
+ xWeights[x] /= totalXWeight
+ }
+
+ sy -= 0.5
+ iy := int(math.Floor(sy - yHalfWidth))
+ if iy < sr.Min.Y {
+ iy = sr.Min.Y
+ }
+ jy := int(math.Ceil(sy + yHalfWidth))
+ if jy > sr.Max.Y {
+ jy = sr.Max.Y
+ }
+
+ totalYWeight := 0.0
+ for ky := iy; ky < jy; ky++ {
+ yWeight := 0.0
+ if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+ yWeight = q.At(t)
+ }
+ yWeights[ky-iy] = yWeight
+ totalYWeight += yWeight
+ }
+ for y := range yWeights[:jy-iy] {
+ yWeights[y] /= totalYWeight
+ }
+
+ var pr, pg, pb, pa float64
+ for ky := iy; ky < jy; ky++ {
+ yWeight := yWeights[ky-iy]
+ for kx := ix; kx < jx; kx++ {
+ pru, pgu, pbu, pau := src.At(kx, ky).RGBA()
+ pr += float64(pru) * xWeights[kx-ix] * yWeight
+ pg += float64(pgu) * xWeights[kx-ix] * yWeight
+ pb += float64(pbu) * xWeights[kx-ix] * yWeight
+ pa += float64(pau) * xWeights[kx-ix] * yWeight
+ }
+ }
+ dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+ dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+ dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+ dst.Pix[d+3] = uint8(fffftou(pa) >> 8)
+ }
+ }
+}
+
+func (q *Kernel) transform_RGBA_YCbCr420(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, xscale, yscale float64) {
+ // When shrinking, broaden the effective kernel support so that we still
+ // visit every source pixel.
+ xHalfWidth, xKernelArgScale := q.Support, 1.0
+ if xscale > 1 {
+ xHalfWidth *= xscale
+ xKernelArgScale = 1 / xscale
+ }
+ yHalfWidth, yKernelArgScale := q.Support, 1.0
+ if yscale > 1 {
+ yHalfWidth *= yscale
+ yKernelArgScale = 1 / yscale
+ }
+
+ xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+ yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+ for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+ dyf := float64(dr.Min.Y+int(dy)) + 0.5
+ d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+ for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+ dxf := float64(dr.Min.X+int(dx)) + 0.5
+ // TODO: change the src origin so that we can say int(f) instead of int(math.Floor(f)).
+ sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+ sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+ if !(image.Point{int(math.Floor(sx)), int(math.Floor(sy))}).In(sr) {
+ continue
+ }
+
+ sx -= 0.5
+ ix := int(math.Floor(sx - xHalfWidth))
+ if ix < sr.Min.X {
+ ix = sr.Min.X
+ }
+ jx := int(math.Ceil(sx + xHalfWidth))
+ if jx > sr.Max.X {
+ jx = sr.Max.X
+ }
+
+ totalXWeight := 0.0
+ for kx := ix; kx < jx; kx++ {
+ xWeight := 0.0
+ if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+ xWeight = q.At(t)
+ }
+ xWeights[kx-ix] = xWeight
+ totalXWeight += xWeight
+ }
+ for x := range xWeights[:jx-ix] {
+ xWeights[x] /= totalXWeight
+ }
+
+ sy -= 0.5
+ iy := int(math.Floor(sy - yHalfWidth))
+ if iy < sr.Min.Y {
+ iy = sr.Min.Y
+ }
+ jy := int(math.Ceil(sy + yHalfWidth))
+ if jy > sr.Max.Y {
+ jy = sr.Max.Y
+ }
+
+ totalYWeight := 0.0
+ for ky := iy; ky < jy; ky++ {
+ yWeight := 0.0
+ if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+ yWeight = q.At(t)
+ }
+ yWeights[ky-iy] = yWeight
+ totalYWeight += yWeight
+ }
+ for y := range yWeights[:jy-iy] {
+ yWeights[y] /= totalYWeight
+ }
+
+ var pr, pg, pb, pa float64
+ for ky := iy; ky < jy; ky++ {
+ yWeight := yWeights[ky-iy]
+ for kx := ix; kx < jx; kx++ {
+ pru, pgu, pbu, pau := src.At(kx, ky).RGBA()
+ pr += float64(pru) * xWeights[kx-ix] * yWeight
+ pg += float64(pgu) * xWeights[kx-ix] * yWeight
+ pb += float64(pbu) * xWeights[kx-ix] * yWeight
+ pa += float64(pau) * xWeights[kx-ix] * yWeight
+ }
+ }
+ dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+ dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+ dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+ dst.Pix[d+3] = uint8(fffftou(pa) >> 8)
+ }
+ }
+}
+
+func (q *Kernel) transform_RGBA_YCbCr440(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, xscale, yscale float64) {
// When shrinking, broaden the effective kernel support so that we still
// visit every source pixel.
xHalfWidth, xKernelArgScale := q.Support, 1.0
