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Bug 951443 - Don't attempt to create 0x0-sized CGContexts when the UnboundnessFixer encounters an empty clip. r=jrmuizel

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This commit is contained in:
Markus Stange 2014-01-08 10:31:17 +01:00
parent d7c5f41aa5
commit 41fb4612d8
1 changed files with 4 additions and 1 deletions
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5
gfx/2d/DrawTargetCG.cpp
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@ -247,13 +247,16 @@ class UnboundnessFixer
{
if (!IsOperatorBoundByMask(blend)) {
mClipBounds = CGContextGetClipBoundingBox(baseCg);
if (CGRectIsEmpty(mClipBounds)) {
return baseCg;
}
// TransparencyLayers aren't blended using the blend mode so
// we are forced to use CGLayers
//XXX: The size here is in default user space units, of the layer relative to the graphics context.
// is the clip bounds still correct if, for example, we have a scale applied to the context?
mLayer = CGLayerCreateWithContext(baseCg, mClipBounds.size, nullptr);
//XXX: if the size is 0x0 we get a nullptr CGContext back from GetContext
mCg = CGLayerGetContext(mLayer);
// CGContext's default to have the origin at the bottom left
// so flip it to the top left and adjust for the origin