mirror of https://github.com/status-im/resize.git
Merge branch 'NRGBA_support'
This adds optimized access to image.NRGBA, image.NRGBA64 types. Internally these image types are now preferred as they are easier to handle if alpha channels are used.
This commit is contained in:
nfnt
commit
3502bb8cd1
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@ -90,7 +90,7 @@ func main() {
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Caveats
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-------
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* Optimized access routines are used for `image.RGBA`, `image.RGBA64`, `image.YCbCr`, `image.Gray`, and `image.Gray16` types. All other image types are accessed in a generic way that will result in slow processing speed.
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* Optimized access routines are used for `image.RGBA`, `image.NRGBA`, `image.RGBA64`, `image.NRGBA64`, `image.YCbCr`, `image.Gray`, and `image.Gray16` types. All other image types are accessed in a generic way that will result in slow processing speed.
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* JPEG images are stored in `image.YCbCr`. This image format stores data in a way that will decrease processing speed. A resize may be up to 2 times slower than with `image.RGBA`.
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94
converter.go
94
converter.go
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@ -43,7 +43,7 @@ func clampUint16(in int64) uint16 {
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return 0
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}
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func resizeGeneric(in image.Image, out *image.RGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
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func resizeGeneric(in image.Image, out *image.NRGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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@ -89,7 +89,7 @@ func resizeGeneric(in image.Image, out *image.RGBA64, scale float64, coeffs []in
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}
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}
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func resizeRGBA(in *image.RGBA, out *image.RGBA, scale float64, coeffs []int16, offset []int, filterLength int) {
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func resizeRGBA(in *image.RGBA, out *image.NRGBA, scale float64, coeffs []int16, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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@ -129,7 +129,95 @@ func resizeRGBA(in *image.RGBA, out *image.RGBA, scale float64, coeffs []int16,
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}
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}
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func resizeRGBA64(in *image.RGBA64, out *image.RGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
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func resizeNRGBA(in *image.NRGBA, out *image.NRGBA, scale float64, coeffs []int16, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
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row := in.Pix[x*in.Stride:]
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for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
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var rgba [4]int32
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var sum int32
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start := offset[y]
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ci := y * filterLength
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for i := 0; i < filterLength; i++ {
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coeff := coeffs[ci+i]
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if coeff != 0 {
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xi := start + i
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switch {
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case uint(xi) < uint(maxX):
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xi *= 4
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case xi >= maxX:
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xi = 4 * maxX
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default:
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xi = 0
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}
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rgba[0] += int32(coeff) * int32(row[xi+0])
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rgba[1] += int32(coeff) * int32(row[xi+1])
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rgba[2] += int32(coeff) * int32(row[xi+2])
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rgba[3] += int32(coeff) * int32(row[xi+3])
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sum += int32(coeff)
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}
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}
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xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
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out.Pix[xo+0] = clampUint8(rgba[0] / sum)
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out.Pix[xo+1] = clampUint8(rgba[1] / sum)
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out.Pix[xo+2] = clampUint8(rgba[2] / sum)
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out.Pix[xo+3] = clampUint8(rgba[3] / sum)
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}
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}
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}
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func resizeRGBA64(in *image.RGBA64, out *image.NRGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
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row := in.Pix[x*in.Stride:]
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for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
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var rgba [4]int64
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var sum int64
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start := offset[y]
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ci := y * filterLength
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for i := 0; i < filterLength; i++ {
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coeff := coeffs[ci+i]
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if coeff != 0 {
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xi := start + i
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switch {
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case uint(xi) < uint(maxX):
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xi *= 8
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case xi >= maxX:
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xi = 8 * maxX
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default:
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xi = 0
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}
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rgba[0] += int64(coeff) * int64(uint16(row[xi+0])<<8|uint16(row[xi+1]))
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rgba[1] += int64(coeff) * int64(uint16(row[xi+2])<<8|uint16(row[xi+3]))
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rgba[2] += int64(coeff) * int64(uint16(row[xi+4])<<8|uint16(row[xi+5]))
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rgba[3] += int64(coeff) * int64(uint16(row[xi+6])<<8|uint16(row[xi+7]))
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sum += int64(coeff)
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}
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}
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xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
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value := clampUint16(rgba[0] / sum)
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out.Pix[xo+0] = uint8(value >> 8)
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out.Pix[xo+1] = uint8(value)
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value = clampUint16(rgba[1] / sum)
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out.Pix[xo+2] = uint8(value >> 8)
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out.Pix[xo+3] = uint8(value)
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value = clampUint16(rgba[2] / sum)
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out.Pix[xo+4] = uint8(value >> 8)
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out.Pix[xo+5] = uint8(value)
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value = clampUint16(rgba[3] / sum)
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out.Pix[xo+6] = uint8(value >> 8)
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out.Pix[xo+7] = uint8(value)
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}
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}
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}
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func resizeNRGBA64(in *image.NRGBA64, out *image.NRGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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86
nearest.go
86
nearest.go
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@ -118,6 +118,45 @@ func nearestRGBA(in *image.RGBA, out *image.RGBA, scale float64, coeffs []bool,
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}
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}
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func nearestNRGBA(in *image.NRGBA, out *image.NRGBA, scale float64, coeffs []bool, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
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row := in.Pix[x*in.Stride:]
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for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
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var rgba [4]float32
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var sum float32
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start := offset[y]
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ci := y * filterLength
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for i := 0; i < filterLength; i++ {
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if coeffs[ci+i] {
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xi := start + i
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switch {
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case uint(xi) < uint(maxX):
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xi *= 4
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case xi >= maxX:
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xi = 4 * maxX
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default:
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xi = 0
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}
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rgba[0] += float32(row[xi+0])
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rgba[1] += float32(row[xi+1])
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rgba[2] += float32(row[xi+2])
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rgba[3] += float32(row[xi+3])
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sum++
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}
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}
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xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
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out.Pix[xo+0] = floatToUint8(rgba[0] / sum)
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out.Pix[xo+1] = floatToUint8(rgba[1] / sum)
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out.Pix[xo+2] = floatToUint8(rgba[2] / sum)
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out.Pix[xo+3] = floatToUint8(rgba[3] / sum)
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}
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}
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}
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func nearestRGBA64(in *image.RGBA64, out *image.RGBA64, scale float64, coeffs []bool, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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@ -165,6 +204,53 @@ func nearestRGBA64(in *image.RGBA64, out *image.RGBA64, scale float64, coeffs []
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}
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}
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func nearestNRGBA64(in *image.NRGBA64, out *image.NRGBA64, scale float64, coeffs []bool, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
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row := in.Pix[x*in.Stride:]
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for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
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var rgba [4]float32
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var sum float32
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start := offset[y]
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ci := y * filterLength
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for i := 0; i < filterLength; i++ {
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if coeffs[ci+i] {
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xi := start + i
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switch {
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case uint(xi) < uint(maxX):
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xi *= 8
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case xi >= maxX:
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xi = 8 * maxX
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default:
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xi = 0
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}
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rgba[0] += float32(uint16(row[xi+0])<<8 | uint16(row[xi+1]))
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rgba[1] += float32(uint16(row[xi+2])<<8 | uint16(row[xi+3]))
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rgba[2] += float32(uint16(row[xi+4])<<8 | uint16(row[xi+5]))
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rgba[3] += float32(uint16(row[xi+6])<<8 | uint16(row[xi+7]))
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sum++
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}
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}
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xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
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value := floatToUint16(rgba[0] / sum)
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out.Pix[xo+0] = uint8(value >> 8)
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out.Pix[xo+1] = uint8(value)
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value = floatToUint16(rgba[1] / sum)
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out.Pix[xo+2] = uint8(value >> 8)
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out.Pix[xo+3] = uint8(value)
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value = floatToUint16(rgba[2] / sum)
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out.Pix[xo+4] = uint8(value >> 8)
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out.Pix[xo+5] = uint8(value)
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value = floatToUint16(rgba[3] / sum)
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out.Pix[xo+6] = uint8(value >> 8)
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out.Pix[xo+7] = uint8(value)
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}
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}
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}
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func nearestGray(in *image.Gray, out *image.Gray, scale float64, coeffs []bool, offset []int, filterLength int) {
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newBounds := out.Bounds()
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maxX := in.Bounds().Dx() - 1
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149
resize.go
149
resize.go
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@ -105,14 +105,14 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
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switch input := img.(type) {
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case *image.RGBA:
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// 8-bit precision
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temp := image.NewRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
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result := image.NewRGBA(image.Rect(0, 0, int(width), int(height)))
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temp := image.NewNRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
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result := image.NewNRGBA(image.Rect(0, 0, int(width), int(height)))
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// horizontal filter, results in transposed temporary image
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coeffs, offset, filterLength := createWeights8(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
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wg.Add(cpus)
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for i := 0; i < cpus; i++ {
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slice := makeSlice(temp, i, cpus).(*image.RGBA)
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slice := makeSlice(temp, i, cpus).(*image.NRGBA)
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go func() {
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defer wg.Done()
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resizeRGBA(input, slice, scaleX, coeffs, offset, filterLength)
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@ -124,14 +124,44 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
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coeffs, offset, filterLength = createWeights8(result.Bounds().Dy(), taps, blur, scaleY, kernel)
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wg.Add(cpus)
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for i := 0; i < cpus; i++ {
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slice := makeSlice(result, i, cpus).(*image.RGBA)
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slice := makeSlice(result, i, cpus).(*image.NRGBA)
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go func() {
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defer wg.Done()
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resizeRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
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resizeNRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
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}()
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}
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wg.Wait()
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return result
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case *image.NRGBA:
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// 8-bit precision
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temp := image.NewNRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
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result := image.NewNRGBA(image.Rect(0, 0, int(width), int(height)))
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// horizontal filter, results in transposed temporary image
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coeffs, offset, filterLength := createWeights8(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
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wg.Add(cpus)
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for i := 0; i < cpus; i++ {
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slice := makeSlice(temp, i, cpus).(*image.NRGBA)
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go func() {
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defer wg.Done()
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resizeNRGBA(input, slice, scaleX, coeffs, offset, filterLength)
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}()
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}
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wg.Wait()
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// horizontal filter on transposed image, result is not transposed
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coeffs, offset, filterLength = createWeights8(result.Bounds().Dy(), taps, blur, scaleY, kernel)
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wg.Add(cpus)
|
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for i := 0; i < cpus; i++ {
|
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slice := makeSlice(result, i, cpus).(*image.NRGBA)
|
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go func() {
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defer wg.Done()
|
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resizeNRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
|
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}()
|
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}
|
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wg.Wait()
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return result
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|
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case *image.YCbCr:
|
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// 8-bit precision
|
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// accessing the YCbCr arrays in a tight loop is slow.
|
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|
|
@ -164,14 +194,14 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
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return result.YCbCr()
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case *image.RGBA64:
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// 16-bit precision
|
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temp := image.NewRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
|
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result := image.NewRGBA64(image.Rect(0, 0, int(width), int(height)))
|
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temp := image.NewNRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
|
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result := image.NewNRGBA64(image.Rect(0, 0, int(width), int(height)))
|
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|
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// horizontal filter, results in transposed temporary image
|
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coeffs, offset, filterLength := createWeights16(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
|
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wg.Add(cpus)
|
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for i := 0; i < cpus; i++ {
|
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slice := makeSlice(temp, i, cpus).(*image.RGBA64)
|
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slice := makeSlice(temp, i, cpus).(*image.NRGBA64)
|
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go func() {
|
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defer wg.Done()
|
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resizeRGBA64(input, slice, scaleX, coeffs, offset, filterLength)
|
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|
|
@ -183,10 +213,39 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
|
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coeffs, offset, filterLength = createWeights16(result.Bounds().Dy(), taps, blur, scaleY, kernel)
|
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wg.Add(cpus)
|
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for i := 0; i < cpus; i++ {
|
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slice := makeSlice(result, i, cpus).(*image.RGBA64)
|
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slice := makeSlice(result, i, cpus).(*image.NRGBA64)
|
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go func() {
|
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defer wg.Done()
|
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resizeGeneric(temp, slice, scaleY, coeffs, offset, filterLength)
|
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resizeNRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
|
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}()
|
||||
}
|
||||
wg.Wait()
|
||||
return result
|
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case *image.NRGBA64:
|
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// 16-bit precision
|
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temp := image.NewNRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
|
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result := image.NewNRGBA64(image.Rect(0, 0, int(width), int(height)))
|
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|
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// horizontal filter, results in transposed temporary image
|
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coeffs, offset, filterLength := createWeights16(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
|
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wg.Add(cpus)
|
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for i := 0; i < cpus; i++ {
|
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slice := makeSlice(temp, i, cpus).(*image.NRGBA64)
|
||||
go func() {
|
||||
defer wg.Done()
|
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resizeNRGBA64(input, slice, scaleX, coeffs, offset, filterLength)
|
||||
}()
|
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}
|
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wg.Wait()
|
||||
|
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// horizontal filter on transposed image, result is not transposed
|
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coeffs, offset, filterLength = createWeights16(result.Bounds().Dy(), taps, blur, scaleY, kernel)
|
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wg.Add(cpus)
|
||||
for i := 0; i < cpus; i++ {
|
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slice := makeSlice(result, i, cpus).(*image.NRGBA64)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
resizeNRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
|
||||
}()
|
||||
}
|
||||
wg.Wait()
|
||||
|
|
@ -251,14 +310,14 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
|
|||
return result
|
||||
default:
|
||||
// 16-bit precision
|
||||
temp := image.NewRGBA64(image.Rect(0, 0, img.Bounds().Dy(), int(width)))
|
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result := image.NewRGBA64(image.Rect(0, 0, int(width), int(height)))
|
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temp := image.NewNRGBA64(image.Rect(0, 0, img.Bounds().Dy(), int(width)))
|
||||
result := image.NewNRGBA64(image.Rect(0, 0, int(width), int(height)))
|
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|
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// horizontal filter, results in transposed temporary image
|
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coeffs, offset, filterLength := createWeights16(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
|
||||
wg.Add(cpus)
|
||||
for i := 0; i < cpus; i++ {
|
||||
slice := makeSlice(temp, i, cpus).(*image.RGBA64)
|
||||
slice := makeSlice(temp, i, cpus).(*image.NRGBA64)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
resizeGeneric(img, slice, scaleX, coeffs, offset, filterLength)
|
||||
|
|
@ -270,10 +329,10 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
|
|||
coeffs, offset, filterLength = createWeights16(result.Bounds().Dy(), taps, blur, scaleY, kernel)
|
||||
wg.Add(cpus)
|
||||
for i := 0; i < cpus; i++ {
|
||||
slice := makeSlice(result, i, cpus).(*image.RGBA64)
|
||||
slice := makeSlice(result, i, cpus).(*image.NRGBA64)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
resizeRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
|
||||
resizeNRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
|
||||
}()
|
||||
}
|
||||
wg.Wait()
|
||||
|
|
@ -316,6 +375,35 @@ func resizeNearest(width, height uint, scaleX, scaleY float64, img image.Image,
|
|||
}
|
||||
wg.Wait()
|
||||
return result
|
||||
case *image.NRGBA:
|
||||
// 8-bit precision
|
||||
temp := image.NewNRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
|
||||
result := image.NewNRGBA(image.Rect(0, 0, int(width), int(height)))
|
||||
|
||||
// horizontal filter, results in transposed temporary image
|
||||
coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
|
||||
wg.Add(cpus)
|
||||
for i := 0; i < cpus; i++ {
|
||||
slice := makeSlice(temp, i, cpus).(*image.NRGBA)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
nearestNRGBA(input, slice, scaleX, coeffs, offset, filterLength)
|
||||
}()
|
||||
}
|
||||
wg.Wait()
|
||||
|
||||
// horizontal filter on transposed image, result is not transposed
|
||||
coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
|
||||
wg.Add(cpus)
|
||||
for i := 0; i < cpus; i++ {
|
||||
slice := makeSlice(result, i, cpus).(*image.NRGBA)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
nearestNRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
|
||||
}()
|
||||
}
|
||||
wg.Wait()
|
||||
return result
|
||||
case *image.YCbCr:
|
||||
// 8-bit precision
|
||||
// accessing the YCbCr arrays in a tight loop is slow.
|
||||
|
|
@ -370,7 +458,36 @@ func resizeNearest(width, height uint, scaleX, scaleY float64, img image.Image,
|
|||
slice := makeSlice(result, i, cpus).(*image.RGBA64)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
nearestGeneric(temp, slice, scaleY, coeffs, offset, filterLength)
|
||||
nearestRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
|
||||
}()
|
||||
}
|
||||
wg.Wait()
|
||||
return result
|
||||
case *image.NRGBA64:
|
||||
// 16-bit precision
|
||||
temp := image.NewNRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
|
||||
result := image.NewNRGBA64(image.Rect(0, 0, int(width), int(height)))
|
||||
|
||||
// horizontal filter, results in transposed temporary image
|
||||
coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
|
||||
wg.Add(cpus)
|
||||
for i := 0; i < cpus; i++ {
|
||||
slice := makeSlice(temp, i, cpus).(*image.NRGBA64)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
nearestNRGBA64(input, slice, scaleX, coeffs, offset, filterLength)
|
||||
}()
|
||||
}
|
||||
wg.Wait()
|
||||
|
||||
// horizontal filter on transposed image, result is not transposed
|
||||
coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
|
||||
wg.Add(cpus)
|
||||
for i := 0; i < cpus; i++ {
|
||||
slice := makeSlice(result, i, cpus).(*image.NRGBA64)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
nearestNRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
|
||||
}()
|
||||
}
|
||||
wg.Wait()
|
||||
|
|
|
|||
Loading…
Reference in New Issue