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332704 Divide-by-zero causes crash on x86 Mac when viewing SVG. Check for /0. r=jhpedemonte r=vlad sr=shaver

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mark%moxienet.com 2006-04-06 20:11:09 +00:00
parent cba58dc723
commit 5554ac3bd6
1 changed files with 11 additions and 3 deletions
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14
gfx/src/mac/nsImageMac.cpp
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@ -579,9 +579,17 @@ nsImageMac::LockImagePixels(PRBool aMaskPixels)
PRUint8 alpha = *tmp++;
mAlphaBits[alphaRowStart + x] = alpha;
PRUint32 offset = rowStart + COMPS_PER_PIXEL * x;
mImageBits[offset + 1] = ((PRUint32) *tmp++) * 255 / alpha;
mImageBits[offset + 2] = ((PRUint32) *tmp++) * 255 / alpha;
mImageBits[offset + 3] = ((PRUint32) *tmp++) * 255 / alpha;
if (alpha) {
mImageBits[offset + 1] = ((PRUint32) *tmp++) * 255 / alpha;
mImageBits[offset + 2] = ((PRUint32) *tmp++) * 255 / alpha;
mImageBits[offset + 3] = ((PRUint32) *tmp++) * 255 / alpha;
}
else {
tmp += 3;
mImageBits[offset + 1] =
mImageBits[offset + 2] =
mImageBits[offset + 3] = 0;
}
}
}
break;