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Bug 1105015. Make the UnboundnessFixer more readable. r=milan

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--HG--
extra : rebase_source : f584762adbf2afbbdccc563f2a198ac069ef0106
This commit is contained in:
Jeff Muizelaar 2014-11-25 17:20:33 -05:00
parent 31b06f7324
commit d7d45a14cb
1 changed files with 9 additions and 8 deletions
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17
gfx/2d/DrawTargetCG.cpp
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@ -266,9 +266,9 @@ class UnboundnessFixer
{
CGRect mClipBounds;
CGLayerRef mLayer;
CGContextRef mCg;
CGContextRef mLayerCg;
public:
UnboundnessFixer() : mCg(nullptr) {}
UnboundnessFixer() : mLayerCg(nullptr) {}
CGContextRef Check(CGContextRef baseCg, CompositionOp blend, const Rect* maskBounds = nullptr)
{
@ -287,14 +287,14 @@ class UnboundnessFixer
//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);
mCg = CGLayerGetContext(mLayer);
mLayerCg = 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
// of the layer
CGContextTranslateCTM(mCg, -mClipBounds.origin.x, mClipBounds.origin.y + mClipBounds.size.height);
CGContextScaleCTM(mCg, 1, -1);
CGContextTranslateCTM(mLayerCg, -mClipBounds.origin.x, mClipBounds.origin.y + mClipBounds.size.height);
CGContextScaleCTM(mLayerCg, 1, -1);
return mCg;
return mLayerCg;
} else {
return baseCg;
}
@ -302,12 +302,13 @@ class UnboundnessFixer
void Fix(CGContextRef baseCg)
{
if (mCg) {
if (mLayerCg) {
// we pushed a layer so draw it to baseCg
CGContextTranslateCTM(baseCg, 0, mClipBounds.size.height);
CGContextScaleCTM(baseCg, 1, -1);
mClipBounds.origin.y *= -1;
CGContextDrawLayerAtPoint(baseCg, mClipBounds.origin, mLayer);
CGContextRelease(mCg);
CGContextRelease(mLayerCg);
}
}
};