diff options
Diffstat (limited to 'vendor/github.com/disintegration/imaging/transform.go')
| -rw-r--r-- | vendor/github.com/disintegration/imaging/transform.go | 217 |
1 files changed, 72 insertions, 145 deletions
diff --git a/vendor/github.com/disintegration/imaging/transform.go b/vendor/github.com/disintegration/imaging/transform.go index 94d72d556..d788d0d42 100644 --- a/vendor/github.com/disintegration/imaging/transform.go +++ b/vendor/github.com/disintegration/imaging/transform.go @@ -8,197 +8,124 @@ import ( // FlipH flips the image horizontally (from left to right) and returns the transformed image. func FlipH(img image.Image) *image.NRGBA { - src := toNRGBA(img) - srcW := src.Bounds().Max.X - srcH := src.Bounds().Max.Y - dstW := srcW - dstH := srcH + src := newScanner(img) + dstW := src.w + dstH := src.h + rowSize := dstW * 4 dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH)) - - parallel(dstH, func(partStart, partEnd int) { - - for dstY := partStart; dstY < partEnd; dstY++ { - for dstX := 0; dstX < dstW; dstX++ { - srcX := dstW - dstX - 1 - srcY := dstY - - srcOff := srcY*src.Stride + srcX*4 - dstOff := dstY*dst.Stride + dstX*4 - - copy(dst.Pix[dstOff:dstOff+4], src.Pix[srcOff:srcOff+4]) - } + parallel(0, dstH, func(ys <-chan int) { + for dstY := range ys { + i := dstY * dst.Stride + srcY := dstY + src.scan(0, srcY, src.w, srcY+1, dst.Pix[i:i+rowSize]) + reverse(dst.Pix[i : i+rowSize]) } - }) - return dst } // FlipV flips the image vertically (from top to bottom) and returns the transformed image. func FlipV(img image.Image) *image.NRGBA { - src := toNRGBA(img) - srcW := src.Bounds().Max.X - srcH := src.Bounds().Max.Y - dstW := srcW - dstH := srcH + src := newScanner(img) + dstW := src.w + dstH := src.h + rowSize := dstW * 4 dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH)) - - parallel(dstH, func(partStart, partEnd int) { - - for dstY := partStart; dstY < partEnd; dstY++ { - for dstX := 0; dstX < dstW; dstX++ { - srcX := dstX - srcY := dstH - dstY - 1 - - srcOff := srcY*src.Stride + srcX*4 - dstOff := dstY*dst.Stride + dstX*4 - - copy(dst.Pix[dstOff:dstOff+4], src.Pix[srcOff:srcOff+4]) - } + parallel(0, dstH, func(ys <-chan int) { + for dstY := range ys { + i := dstY * dst.Stride + srcY := dstH - dstY - 1 + src.scan(0, srcY, src.w, srcY+1, dst.Pix[i:i+rowSize]) } - }) - return dst } // Transpose flips the image horizontally and rotates 90 degrees counter-clockwise. func Transpose(img image.Image) *image.NRGBA { - src := toNRGBA(img) - srcW := src.Bounds().Max.X - srcH := src.Bounds().Max.Y - dstW := srcH - dstH := srcW + src := newScanner(img) + dstW := src.h + dstH := src.w + rowSize := dstW * 4 dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH)) - - parallel(dstH, func(partStart, partEnd int) { - - for dstY := partStart; dstY < partEnd; dstY++ { - for dstX := 0; dstX < dstW; dstX++ { - srcX := dstY - srcY := dstX - - srcOff := srcY*src.Stride + srcX*4 - dstOff := dstY*dst.Stride + dstX*4 - - copy(dst.Pix[dstOff:dstOff+4], src.Pix[srcOff:srcOff+4]) - } + parallel(0, dstH, func(ys <-chan int) { + for dstY := range ys { + i := dstY * dst.Stride + srcX := dstY + src.scan(srcX, 0, srcX+1, src.h, dst.Pix[i:i+rowSize]) } - }) - return dst } // Transverse flips the image vertically and rotates 90 degrees counter-clockwise. func Transverse(img image.Image) *image.NRGBA { - src := toNRGBA(img) - srcW := src.Bounds().Max.X - srcH := src.Bounds().Max.Y - dstW := srcH - dstH := srcW + src := newScanner(img) + dstW := src.h + dstH := src.w + rowSize := dstW * 4 dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH)) - - parallel(dstH, func(partStart, partEnd int) { - - for dstY := partStart; dstY < partEnd; dstY++ { - for dstX := 0; dstX < dstW; dstX++ { - srcX := dstH - dstY - 1 - srcY := dstW - dstX - 1 - - srcOff := srcY*src.Stride + srcX*4 - dstOff := dstY*dst.Stride + dstX*4 - - copy(dst.Pix[dstOff:dstOff+4], src.Pix[srcOff:srcOff+4]) - } + parallel(0, dstH, func(ys <-chan int) { + for dstY := range ys { + i := dstY * dst.Stride + srcX := dstH - dstY - 1 + src.scan(srcX, 0, srcX+1, src.h, dst.Pix[i:i+rowSize]) + reverse(dst.Pix[i : i+rowSize]) } - }) - return dst } -// Rotate90 rotates the image 90 degrees counterclockwise and returns the transformed image. +// Rotate90 rotates the image 90 degrees counter-clockwise and returns the transformed image. func Rotate90(img image.Image) *image.NRGBA { - src := toNRGBA(img) - srcW := src.Bounds().Max.X - srcH := src.Bounds().Max.Y - dstW := srcH - dstH := srcW + src := newScanner(img) + dstW := src.h + dstH := src.w + rowSize := dstW * 4 dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH)) - - parallel(dstH, func(partStart, partEnd int) { - - for dstY := partStart; dstY < partEnd; dstY++ { - for dstX := 0; dstX < dstW; dstX++ { - srcX := dstH - dstY - 1 - srcY := dstX - - srcOff := srcY*src.Stride + srcX*4 - dstOff := dstY*dst.Stride + dstX*4 - - copy(dst.Pix[dstOff:dstOff+4], src.Pix[srcOff:srcOff+4]) - } + parallel(0, dstH, func(ys <-chan int) { + for dstY := range ys { + i := dstY * dst.Stride + srcX := dstH - dstY - 1 + src.scan(srcX, 0, srcX+1, src.h, dst.Pix[i:i+rowSize]) } - }) - return dst } -// Rotate180 rotates the image 180 degrees counterclockwise and returns the transformed image. +// Rotate180 rotates the image 180 degrees counter-clockwise and returns the transformed image. func Rotate180(img image.Image) *image.NRGBA { - src := toNRGBA(img) - srcW := src.Bounds().Max.X - srcH := src.Bounds().Max.Y - dstW := srcW - dstH := srcH + src := newScanner(img) + dstW := src.w + dstH := src.h + rowSize := dstW * 4 dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH)) - - parallel(dstH, func(partStart, partEnd int) { - - for dstY := partStart; dstY < partEnd; dstY++ { - for dstX := 0; dstX < dstW; dstX++ { - srcX := dstW - dstX - 1 - srcY := dstH - dstY - 1 - - srcOff := srcY*src.Stride + srcX*4 - dstOff := dstY*dst.Stride + dstX*4 - - copy(dst.Pix[dstOff:dstOff+4], src.Pix[srcOff:srcOff+4]) - } + parallel(0, dstH, func(ys <-chan int) { + for dstY := range ys { + i := dstY * dst.Stride + srcY := dstH - dstY - 1 + src.scan(0, srcY, src.w, srcY+1, dst.Pix[i:i+rowSize]) + reverse(dst.Pix[i : i+rowSize]) } - }) - return dst } -// Rotate270 rotates the image 270 degrees counterclockwise and returns the transformed image. +// Rotate270 rotates the image 270 degrees counter-clockwise and returns the transformed image. func Rotate270(img image.Image) *image.NRGBA { - src := toNRGBA(img) - srcW := src.Bounds().Max.X - srcH := src.Bounds().Max.Y - dstW := srcH - dstH := srcW + src := newScanner(img) + dstW := src.h + dstH := src.w + rowSize := dstW * 4 dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH)) - - parallel(dstH, func(partStart, partEnd int) { - - for dstY := partStart; dstY < partEnd; dstY++ { - for dstX := 0; dstX < dstW; dstX++ { - srcX := dstY - srcY := dstW - dstX - 1 - - srcOff := srcY*src.Stride + srcX*4 - dstOff := dstY*dst.Stride + dstX*4 - - copy(dst.Pix[dstOff:dstOff+4], src.Pix[srcOff:srcOff+4]) - } + parallel(0, dstH, func(ys <-chan int) { + for dstY := range ys { + i := dstY * dst.Stride + srcX := dstY + src.scan(srcX, 0, srcX+1, src.h, dst.Pix[i:i+rowSize]) + reverse(dst.Pix[i : i+rowSize]) } - }) - return dst } @@ -237,8 +164,8 @@ func Rotate(img image.Image, angle float64, bgColor color.Color) *image.NRGBA { bgColorNRGBA := color.NRGBAModel.Convert(bgColor).(color.NRGBA) sin, cos := math.Sincos(math.Pi * angle / 180) - parallel(dstH, func(partStart, partEnd int) { - for dstY := partStart; dstY < partEnd; dstY++ { + parallel(0, dstH, func(ys <-chan int) { + for dstY := range ys { for dstX := 0; dstX < dstW; dstX++ { xf, yf := rotatePoint(float64(dstX)-dstXOff, float64(dstY)-dstYOff, sin, cos) xf, yf = xf+srcXOff, yf+srcYOff |