diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/nfnt/resize/ycc.go')
| -rw-r--r-- | Godeps/_workspace/src/github.com/nfnt/resize/ycc.go | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/Godeps/_workspace/src/github.com/nfnt/resize/ycc.go b/Godeps/_workspace/src/github.com/nfnt/resize/ycc.go deleted file mode 100644 index 104159955..000000000 --- a/Godeps/_workspace/src/github.com/nfnt/resize/ycc.go +++ /dev/null @@ -1,227 +0,0 @@ -/* -Copyright (c) 2014, Charlie Vieth <charlie.vieth@gmail.com> - -Permission to use, copy, modify, and/or distribute this software for any purpose -with or without fee is hereby granted, provided that the above copyright notice -and this permission notice appear in all copies. - -THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH -REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND -FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, -INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS -OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER -TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF -THIS SOFTWARE. -*/ - -package resize - -import ( - "image" - "image/color" -) - -// ycc is an in memory YCbCr image. The Y, Cb and Cr samples are held in a -// single slice to increase resizing performance. -type ycc struct { - // Pix holds the image's pixels, in Y, Cb, Cr order. The pixel at - // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*3]. - Pix []uint8 - // Stride is the Pix stride (in bytes) between vertically adjacent pixels. - Stride int - // Rect is the image's bounds. - Rect image.Rectangle - // SubsampleRatio is the subsample ratio of the original YCbCr image. - SubsampleRatio image.YCbCrSubsampleRatio -} - -// PixOffset returns the index of the first element of Pix that corresponds to -// the pixel at (x, y). -func (p *ycc) PixOffset(x, y int) int { - return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*3 -} - -func (p *ycc) Bounds() image.Rectangle { - return p.Rect -} - -func (p *ycc) ColorModel() color.Model { - return color.YCbCrModel -} - -func (p *ycc) At(x, y int) color.Color { - if !(image.Point{x, y}.In(p.Rect)) { - return color.YCbCr{} - } - i := p.PixOffset(x, y) - return color.YCbCr{ - p.Pix[i+0], - p.Pix[i+1], - p.Pix[i+2], - } -} - -func (p *ycc) Opaque() bool { - return true -} - -// SubImage returns an image representing the portion of the image p visible -// through r. The returned value shares pixels with the original image. -func (p *ycc) SubImage(r image.Rectangle) image.Image { - r = r.Intersect(p.Rect) - if r.Empty() { - return &ycc{SubsampleRatio: p.SubsampleRatio} - } - i := p.PixOffset(r.Min.X, r.Min.Y) - return &ycc{ - Pix: p.Pix[i:], - Stride: p.Stride, - Rect: r, - SubsampleRatio: p.SubsampleRatio, - } -} - -// newYCC returns a new ycc with the given bounds and subsample ratio. -func newYCC(r image.Rectangle, s image.YCbCrSubsampleRatio) *ycc { - w, h := r.Dx(), r.Dy() - buf := make([]uint8, 3*w*h) - return &ycc{Pix: buf, Stride: 3 * w, Rect: r, SubsampleRatio: s} -} - -// YCbCr converts ycc to a YCbCr image with the same subsample ratio -// as the YCbCr image that ycc was generated from. -func (p *ycc) YCbCr() *image.YCbCr { - ycbcr := image.NewYCbCr(p.Rect, p.SubsampleRatio) - var off int - - switch ycbcr.SubsampleRatio { - case image.YCbCrSubsampleRatio422: - for y := ycbcr.Rect.Min.Y; y < ycbcr.Rect.Max.Y; y++ { - yy := (y - ycbcr.Rect.Min.Y) * ycbcr.YStride - cy := (y - ycbcr.Rect.Min.Y) * ycbcr.CStride - for x := ycbcr.Rect.Min.X; x < ycbcr.Rect.Max.X; x++ { - xx := (x - ycbcr.Rect.Min.X) - yi := yy + xx - ci := cy + xx/2 - ycbcr.Y[yi] = p.Pix[off+0] - ycbcr.Cb[ci] = p.Pix[off+1] - ycbcr.Cr[ci] = p.Pix[off+2] - off += 3 - } - } - case image.YCbCrSubsampleRatio420: - for y := ycbcr.Rect.Min.Y; y < ycbcr.Rect.Max.Y; y++ { - yy := (y - ycbcr.Rect.Min.Y) * ycbcr.YStride - cy := (y/2 - ycbcr.Rect.Min.Y/2) * ycbcr.CStride - for x := ycbcr.Rect.Min.X; x < ycbcr.Rect.Max.X; x++ { - xx := (x - ycbcr.Rect.Min.X) - yi := yy + xx - ci := cy + xx/2 - ycbcr.Y[yi] = p.Pix[off+0] - ycbcr.Cb[ci] = p.Pix[off+1] - ycbcr.Cr[ci] = p.Pix[off+2] - off += 3 - } - } - case image.YCbCrSubsampleRatio440: - for y := ycbcr.Rect.Min.Y; y < ycbcr.Rect.Max.Y; y++ { - yy := (y - ycbcr.Rect.Min.Y) * ycbcr.YStride - cy := (y/2 - ycbcr.Rect.Min.Y/2) * ycbcr.CStride - for x := ycbcr.Rect.Min.X; x < ycbcr.Rect.Max.X; x++ { - xx := (x - ycbcr.Rect.Min.X) - yi := yy + xx - ci := cy + xx - ycbcr.Y[yi] = p.Pix[off+0] - ycbcr.Cb[ci] = p.Pix[off+1] - ycbcr.Cr[ci] = p.Pix[off+2] - off += 3 - } - } - default: - // Default to 4:4:4 subsampling. - for y := ycbcr.Rect.Min.Y; y < ycbcr.Rect.Max.Y; y++ { - yy := (y - ycbcr.Rect.Min.Y) * ycbcr.YStride - cy := (y - ycbcr.Rect.Min.Y) * ycbcr.CStride - for x := ycbcr.Rect.Min.X; x < ycbcr.Rect.Max.X; x++ { - xx := (x - ycbcr.Rect.Min.X) - yi := yy + xx - ci := cy + xx - ycbcr.Y[yi] = p.Pix[off+0] - ycbcr.Cb[ci] = p.Pix[off+1] - ycbcr.Cr[ci] = p.Pix[off+2] - off += 3 - } - } - } - return ycbcr -} - -// imageYCbCrToYCC converts a YCbCr image to a ycc image for resizing. -func imageYCbCrToYCC(in *image.YCbCr) *ycc { - w, h := in.Rect.Dx(), in.Rect.Dy() - r := image.Rect(0, 0, w, h) - buf := make([]uint8, 3*w*h) - p := ycc{Pix: buf, Stride: 3 * w, Rect: r, SubsampleRatio: in.SubsampleRatio} - var off int - - switch in.SubsampleRatio { - case image.YCbCrSubsampleRatio422: - for y := in.Rect.Min.Y; y < in.Rect.Max.Y; y++ { - yy := (y - in.Rect.Min.Y) * in.YStride - cy := (y - in.Rect.Min.Y) * in.CStride - for x := in.Rect.Min.X; x < in.Rect.Max.X; x++ { - xx := (x - in.Rect.Min.X) - yi := yy + xx - ci := cy + xx/2 - p.Pix[off+0] = in.Y[yi] - p.Pix[off+1] = in.Cb[ci] - p.Pix[off+2] = in.Cr[ci] - off += 3 - } - } - case image.YCbCrSubsampleRatio420: - for y := in.Rect.Min.Y; y < in.Rect.Max.Y; y++ { - yy := (y - in.Rect.Min.Y) * in.YStride - cy := (y/2 - in.Rect.Min.Y/2) * in.CStride - for x := in.Rect.Min.X; x < in.Rect.Max.X; x++ { - xx := (x - in.Rect.Min.X) - yi := yy + xx - ci := cy + xx/2 - p.Pix[off+0] = in.Y[yi] - p.Pix[off+1] = in.Cb[ci] - p.Pix[off+2] = in.Cr[ci] - off += 3 - } - } - case image.YCbCrSubsampleRatio440: - for y := in.Rect.Min.Y; y < in.Rect.Max.Y; y++ { - yy := (y - in.Rect.Min.Y) * in.YStride - cy := (y/2 - in.Rect.Min.Y/2) * in.CStride - for x := in.Rect.Min.X; x < in.Rect.Max.X; x++ { - xx := (x - in.Rect.Min.X) - yi := yy + xx - ci := cy + xx - p.Pix[off+0] = in.Y[yi] - p.Pix[off+1] = in.Cb[ci] - p.Pix[off+2] = in.Cr[ci] - off += 3 - } - } - default: - // Default to 4:4:4 subsampling. - for y := in.Rect.Min.Y; y < in.Rect.Max.Y; y++ { - yy := (y - in.Rect.Min.Y) * in.YStride - cy := (y - in.Rect.Min.Y) * in.CStride - for x := in.Rect.Min.X; x < in.Rect.Max.X; x++ { - xx := (x - in.Rect.Min.X) - yi := yy + xx - ci := cy + xx - p.Pix[off+0] = in.Y[yi] - p.Pix[off+1] = in.Cb[ci] - p.Pix[off+2] = in.Cr[ci] - off += 3 - } - } - } - return &p -} |