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check to see if CGImage already knows if we're opaque

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Review URL: https://codereview.appspot.com/6838043

git-svn-id: http://skia.googlecode.com/svn/trunk@6340 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2012-11-07 22:06:55 +00:00
parent e8ca6c6e3a
commit 52e91bf564
1 changed files with 12 additions and 2 deletions
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14
src/ports/SkImageDecoder_CG.cpp
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@ -87,8 +87,18 @@ bool SkImageDecoder_CG::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
CGContextDrawImage(cg, CGRectMake(0, 0, width, height), image);
CGContextRelease(cg);
// since CGImage won't tell us if it is opaque, we have to compute it.
bm->computeAndSetOpaquePredicate();
CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
switch (info) {
case kCGImageAlphaNone:
case kCGImageAlphaNoneSkipLast:
case kCGImageAlphaNoneSkipFirst:
SkASSERT(SkBitmap::ComputeIsOpaque(*bm));
bm->setIsOpaque(true);
break;
default:
// we don't know if we're opaque or not, so compute it.
bm->computeAndSetOpaquePredicate();
}
bm->unlockPixels();
return true;
}