Added all required dependencies
This commit is contained in:
Thomas Boerger
parent
78f86abba4
commit
1ebb35b988
660 changed files with 502447 additions and 0 deletions
227
vendor/github.com/nfnt/resize/ycc.go
generated
vendored
Normal file
227
vendor/github.com/nfnt/resize/ycc.go
generated
vendored
Normal file
|
|
@ -0,0 +1,227 @@
|
|||
/*
|
||||
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
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue