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Bug 951302 - Fix BasicCompositor handling of mask layers. r=mattwoodrow

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This commit is contained in:
Markus Stange 2013-12-18 12:19:47 +01:00
parent f12896cd3b
commit d202381227
1 changed files with 10 additions and 7 deletions
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17
gfx/layers/basic/BasicCompositor.cpp
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@ -302,13 +302,16 @@ DrawSurfaceWithTextureCoords(DrawTarget *aDest,
gfxPoint(aDestRect.XMost(), aDestRect.YMost()));
Matrix matrix = ToMatrix(transform);
if (aMask) {
NS_ASSERTION(matrix._11 == 1.0f && matrix._12 == 0.0f &&
matrix._21 == 0.0f && matrix._22 == 1.0f,
"Can only handle translations for mask transform");
aDest->MaskSurface(SurfacePattern(aSource, EXTEND_CLAMP, matrix),
aMask,
Point(matrix._31, matrix._32),
DrawOptions(aOpacity));
aDest->PushClipRect(aDestRect);
Matrix maskTransformInverse = aMaskTransform;
maskTransformInverse.Invert();
Matrix dtTransform = aDest->GetTransform();
aDest->SetTransform(aMaskTransform);
Matrix patternMatrix = maskTransformInverse * dtTransform * matrix;
aDest->MaskSurface(SurfacePattern(aSource, EXTEND_REPEAT, patternMatrix),
aMask, Point(), DrawOptions(aOpacity));
aDest->SetTransform(dtTransform);
aDest->PopClip();
} else {
aDest->FillRect(aDestRect,
SurfacePattern(aSource, EXTEND_REPEAT, matrix),