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Bug 1216200. Correct for negative spread values with inset box shadows. r=mstange

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This commit is contained in:
Mason Chang 2015-10-22 15:50:25 -07:00
parent e02f306961
commit 857d67f29e
1 changed files with 21 additions and 2 deletions
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23
gfx/thebes/gfxBlur.cpp
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@ -815,8 +815,27 @@ ComputeRectsForInsetBoxShadow(IntSize aBlurRadius,
ceil(cornerWidth) + rectBufferSize.width);
aOutPathMargins = innerMargin;
IntSize minInnerSize(innerMargin.LeftRight() + 1,
innerMargin.TopBottom() + 1);
// If we have a negative spread radius, we would not have enough
// size to actually do the blur. So the min size must be the abs() of the blur
// and spread radius.
IntSize minBlurSize(std::abs(aSpreadRadius.width) + std::abs(aBlurRadius.width),
std::abs(aSpreadRadius.height) + std::abs(aBlurRadius.height));
IntMargin minInnerMargins = IntMargin(ceil(cornerHeight) + minBlurSize.height,
ceil(cornerWidth) + minBlurSize.width,
ceil(cornerHeight) + minBlurSize.height,
ceil(cornerWidth) + minBlurSize.width);
IntSize minInnerSize(minInnerMargins.LeftRight() + 1,
minInnerMargins.TopBottom() + 1);
if (aShadowClipRect.height < minInnerSize.height) {
minInnerSize.height = aShadowClipRect.height;
}
if (aShadowClipRect.width < minInnerSize.width) {
minInnerSize.width = aShadowClipRect.width;
}
// Then expand the outer rect based on the size between the inner/outer rects
IntSize minOuterSize(minInnerSize);