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image/png: update palette out-of-bounds comment.

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R=r
CC=golang-dev
https://golang.org/cl/6817070
This commit is contained in:
Nigel Tao 2012-11-02 17:20:19 +11:00
parent 002103f51c
commit d659633aff
1 changed files with 5 additions and 4 deletions
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9
src/pkg/image/png/reader.go
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@ -198,10 +198,11 @@ func (d *decoder) parsePLTE(length uint32) error {
d.palette[i] = color.RGBA{d.tmp[3*i+0], d.tmp[3*i+1], d.tmp[3*i+2], 0xff}
}
for i := np; i < 256; i++ {
// Initialize the rest of the palette to opaque black. The spec isn't
// clear whether palette index values outside of those defined by the PLTE
// chunk is an error: libpng 1.5.13 falls back to opaque black, the
// same as we do here, ImageMagick 6.5.7 returns an error.
// Initialize the rest of the palette to opaque black. The spec (section
// 11.2.3) says that "any out-of-range pixel value found in the image data
// is an error", but some real-world PNG files have out-of-range pixel
// values. We fall back to opaque black, the same as libpng 1.5.13;
// ImageMagick 6.5.7 returns an error.
d.palette[i] = color.RGBA{0x00, 0x00, 0x00, 0xff}
}
d.palette = d.palette[:np]