diff options
Diffstat (limited to 'src/pkg/image/ycbcr.go')
| -rw-r--r-- | src/pkg/image/ycbcr.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/pkg/image/ycbcr.go b/src/pkg/image/ycbcr.go index c1a0b666f..5b73bef78 100644 --- a/src/pkg/image/ycbcr.go +++ b/src/pkg/image/ycbcr.go @@ -15,6 +15,7 @@ const ( YCbCrSubsampleRatio444 YCbCrSubsampleRatio = iota YCbCrSubsampleRatio422 YCbCrSubsampleRatio420 + YCbCrSubsampleRatio440 ) func (s YCbCrSubsampleRatio) String() string { @@ -25,6 +26,8 @@ func (s YCbCrSubsampleRatio) String() string { return "YCbCrSubsampleRatio422" case YCbCrSubsampleRatio420: return "YCbCrSubsampleRatio420" + case YCbCrSubsampleRatio440: + return "YCbCrSubsampleRatio440" } return "YCbCrSubsampleRatioUnknown" } @@ -39,6 +42,7 @@ func (s YCbCrSubsampleRatio) String() string { // For 4:4:4, CStride == YStride/1 && len(Cb) == len(Cr) == len(Y)/1. // For 4:2:2, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/2. // For 4:2:0, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/4. +// For 4:4:0, CStride == YStride/1 && len(Cb) == len(Cr) == len(Y)/2. type YCbCr struct { Y, Cb, Cr []uint8 YStride int @@ -82,6 +86,8 @@ func (p *YCbCr) COffset(x, y int) int { return (y-p.Rect.Min.Y)*p.CStride + (x/2 - p.Rect.Min.X/2) case YCbCrSubsampleRatio420: return (y/2-p.Rect.Min.Y/2)*p.CStride + (x/2 - p.Rect.Min.X/2) + case YCbCrSubsampleRatio440: + return (y/2-p.Rect.Min.Y/2)*p.CStride + (x - p.Rect.Min.X) } // Default to 4:4:4 subsampling. return (y-p.Rect.Min.Y)*p.CStride + (x - p.Rect.Min.X) @@ -126,6 +132,9 @@ func NewYCbCr(r Rectangle, subsampleRatio YCbCrSubsampleRatio) *YCbCr { case YCbCrSubsampleRatio420: cw = (r.Max.X+1)/2 - r.Min.X/2 ch = (r.Max.Y+1)/2 - r.Min.Y/2 + case YCbCrSubsampleRatio440: + cw = w + ch = (r.Max.Y+1)/2 - r.Min.Y/2 default: // Default to 4:4:4 subsampling. cw = w |