diff options
Diffstat (limited to 'libgo/go/image/ycbcr.go')
| -rw-r--r-- | libgo/go/image/ycbcr.go | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libgo/go/image/ycbcr.go b/libgo/go/image/ycbcr.go index 71c0518a818..fbdffe1bd1b 100644 --- a/libgo/go/image/ycbcr.go +++ b/libgo/go/image/ycbcr.go @@ -168,6 +168,16 @@ func yCbCrSize(r Rectangle, subsampleRatio YCbCrSubsampleRatio) (w, h, cw, ch in // ratio. func NewYCbCr(r Rectangle, subsampleRatio YCbCrSubsampleRatio) *YCbCr { w, h, cw, ch := yCbCrSize(r, subsampleRatio) + + // totalLength should be the same as i2, below, for a valid Rectangle r. + totalLength := add2NonNeg( + mul3NonNeg(1, w, h), + mul3NonNeg(2, cw, ch), + ) + if totalLength < 0 { + panic("image: NewYCbCr Rectangle has huge or negative dimensions") + } + i0 := w*h + 0*cw*ch i1 := w*h + 1*cw*ch i2 := w*h + 2*cw*ch @@ -277,6 +287,16 @@ func (p *NYCbCrA) Opaque() bool { // ratio. func NewNYCbCrA(r Rectangle, subsampleRatio YCbCrSubsampleRatio) *NYCbCrA { w, h, cw, ch := yCbCrSize(r, subsampleRatio) + + // totalLength should be the same as i3, below, for a valid Rectangle r. + totalLength := add2NonNeg( + mul3NonNeg(2, w, h), + mul3NonNeg(2, cw, ch), + ) + if totalLength < 0 { + panic("image: NewNYCbCrA Rectangle has huge or negative dimension") + } + i0 := 1*w*h + 0*cw*ch i1 := 1*w*h + 1*cw*ch i2 := 1*w*h + 2*cw*ch |