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Bug 598202: Avoid drawing borders which are fully transparent. r=vlad a=vlad

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This commit is contained in:
Bas Schouten 2010-11-08 22:52:02 +01:00
parent 3b2a61ca30
commit bba6216a0e
1 changed files with 10 additions and 6 deletions
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16
layout/base/nsCSSRenderingBorders.cpp
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@ -1014,15 +1014,19 @@ nsCSSBorderRenderer::DrawBorders()
PRBool brBordersSame = AreBorderSideFinalStylesSame(SIDE_BIT_BOTTOM | SIDE_BIT_RIGHT);
PRBool allBordersSame = AreBorderSideFinalStylesSame(SIDE_BITS_ALL);
if (allBordersSame &&
mCompositeColors[0] == NULL &&
(mBorderStyles[0] == NS_STYLE_BORDER_STYLE_NONE ||
mBorderStyles[0] == NS_STYLE_BORDER_STYLE_HIDDEN ||
mBorderColors[0] == NS_RGBA(0,0,0,0)))
((mCompositeColors[0] == NULL &&
(mBorderStyles[0] == NS_STYLE_BORDER_STYLE_NONE ||
mBorderStyles[0] == NS_STYLE_BORDER_STYLE_HIDDEN ||
mBorderColors[0] == NS_RGBA(0,0,0,0))) ||
(mCompositeColors[0] &&
(mCompositeColors[0]->mColor == NS_RGBA(0,0,0,0) &&
!mCompositeColors[0]->mNext))))
{
// All borders are the same style, and the style is either none or hidden, or the color
// is transparent.
// This doesn't check if the composite colors happen to be all transparent, but that should
// happen very rarely in practice.
// This also checks if the first composite color is transparent, and there are
// no others. It doesn't check if there are subsequent transparent ones, because
// that would be very silly.
return;
}