diff options
Diffstat (limited to 'vendor/github.com/disintegration/imaging/helpers.go')
| -rw-r--r-- | vendor/github.com/disintegration/imaging/helpers.go | 44 |
1 files changed, 12 insertions, 32 deletions
diff --git a/vendor/github.com/disintegration/imaging/helpers.go b/vendor/github.com/disintegration/imaging/helpers.go index 79967ae44..3a4cbde80 100644 --- a/vendor/github.com/disintegration/imaging/helpers.go +++ b/vendor/github.com/disintegration/imaging/helpers.go @@ -1,11 +1,9 @@ -/* -Package imaging provides basic image manipulation functions (resize, rotate, flip, crop, etc.). -This package is based on the standard Go image package and works best along with it. - -Image manipulation functions provided by the package take any image type -that implements `image.Image` interface as an input, and return a new image of -`*image.NRGBA` type (32bit RGBA colors, not premultiplied by alpha). -*/ +// Package imaging provides basic image manipulation functions (resize, rotate, flip, crop, etc.). +// This package is based on the standard Go image package and works best along with it. +// +// Image manipulation functions provided by the package take any image type +// that implements `image.Image` interface as an input, and return a new image of +// `*image.NRGBA` type (32bit RGBA colors, not premultiplied by alpha). package imaging import ( @@ -24,8 +22,10 @@ import ( "golang.org/x/image/tiff" ) +// Format is an image file format. type Format int +// Image file formats. const ( JPEG Format = iota PNG @@ -52,6 +52,7 @@ func (f Format) String() string { } var ( + // ErrUnsupportedFormat means the given image format (or file extension) is unsupported. ErrUnsupportedFormat = errors.New("imaging: unsupported image format") ) @@ -194,15 +195,12 @@ func Clone(img image.Image) *image.NRGBA { di := dst.PixOffset(0, dstY) si := src.PixOffset(srcMinX, srcMinY+dstY) for dstX := 0; dstX < dstW; dstX++ { - dst.Pix[di+0] = src.Pix[si+0] dst.Pix[di+1] = src.Pix[si+2] dst.Pix[di+2] = src.Pix[si+4] dst.Pix[di+3] = src.Pix[si+6] - di += 4 si += 8 - } } }) @@ -213,9 +211,9 @@ func Clone(img image.Image) *image.NRGBA { di := dst.PixOffset(0, dstY) si := src.PixOffset(srcMinX, srcMinY+dstY) for dstX := 0; dstX < dstW; dstX++ { - a := src.Pix[si+3] dst.Pix[di+3] = a + switch a { case 0: dst.Pix[di+0] = 0 @@ -237,7 +235,6 @@ func Clone(img image.Image) *image.NRGBA { di += 4 si += 4 - } } }) @@ -248,9 +245,9 @@ func Clone(img image.Image) *image.NRGBA { di := dst.PixOffset(0, dstY) si := src.PixOffset(srcMinX, srcMinY+dstY) for dstX := 0; dstX < dstW; dstX++ { - a := src.Pix[si+6] dst.Pix[di+3] = a + switch a { case 0: dst.Pix[di+0] = 0 @@ -272,7 +269,6 @@ func Clone(img image.Image) *image.NRGBA { di += 4 si += 8 - } } }) @@ -283,16 +279,13 @@ func Clone(img image.Image) *image.NRGBA { di := dst.PixOffset(0, dstY) si := src.PixOffset(srcMinX, srcMinY+dstY) for dstX := 0; dstX < dstW; dstX++ { - c := src.Pix[si] dst.Pix[di+0] = c dst.Pix[di+1] = c dst.Pix[di+2] = c dst.Pix[di+3] = 0xff - di += 4 si += 1 - } } }) @@ -303,16 +296,13 @@ func Clone(img image.Image) *image.NRGBA { di := dst.PixOffset(0, dstY) si := src.PixOffset(srcMinX, srcMinY+dstY) for dstX := 0; dstX < dstW; dstX++ { - c := src.Pix[si] dst.Pix[di+0] = c dst.Pix[di+1] = c dst.Pix[di+2] = c dst.Pix[di+3] = 0xff - di += 4 si += 2 - } } }) @@ -322,7 +312,6 @@ func Clone(img image.Image) *image.NRGBA { for dstY := partStart; dstY < partEnd; dstY++ { di := dst.PixOffset(0, dstY) for dstX := 0; dstX < dstW; dstX++ { - srcX := srcMinX + dstX srcY := srcMinY + dstY siy := src.YOffset(srcX, srcY) @@ -332,9 +321,7 @@ func Clone(img image.Image) *image.NRGBA { dst.Pix[di+1] = g dst.Pix[di+2] = b dst.Pix[di+3] = 0xff - di += 4 - } } }) @@ -345,22 +332,18 @@ func Clone(img image.Image) *image.NRGBA { for i := 0; i < plen; i++ { pnew[i] = color.NRGBAModel.Convert(src.Palette[i]).(color.NRGBA) } - parallel(dstH, func(partStart, partEnd int) { for dstY := partStart; dstY < partEnd; dstY++ { di := dst.PixOffset(0, dstY) si := src.PixOffset(srcMinX, srcMinY+dstY) for dstX := 0; dstX < dstW; dstX++ { - c := pnew[src.Pix[si]] dst.Pix[di+0] = c.R dst.Pix[di+1] = c.G dst.Pix[di+2] = c.B dst.Pix[di+3] = c.A - di += 4 si += 1 - } } }) @@ -370,15 +353,12 @@ func Clone(img image.Image) *image.NRGBA { for dstY := partStart; dstY < partEnd; dstY++ { di := dst.PixOffset(0, dstY) for dstX := 0; dstX < dstW; dstX++ { - c := color.NRGBAModel.Convert(img.At(srcMinX+dstX, srcMinY+dstY)).(color.NRGBA) dst.Pix[di+0] = c.R dst.Pix[di+1] = c.G dst.Pix[di+2] = c.B dst.Pix[di+3] = c.A - di += 4 - } } }) @@ -388,7 +368,7 @@ func Clone(img image.Image) *image.NRGBA { return dst } -// This function used internally to convert any image type to NRGBA if needed. +// toNRGBA converts any image type to *image.NRGBA with min-point at (0, 0). func toNRGBA(img image.Image) *image.NRGBA { srcBounds := img.Bounds() if srcBounds.Min.X == 0 && srcBounds.Min.Y == 0 { |