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Bug 865806 - Part 1: Continue walking up the frame tree when hitting a transparent frame as we're trying to determine whether a given element's background is dark or not; r=roc

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This heuristic improvement gives us correct dark background detection in
pdf.js, among other cases.

--HG--
extra : rebase_source : 5a8f920da1b63f6452ec709745b2154b6fc17ceb
This commit is contained in:
Ehsan Akhgari 2013-05-30 14:27:57 -04:00
parent b64aed8e7c
commit 574b61e8c5
1 changed files with 7 additions and 2 deletions
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9
widget/xpwidgets/nsNativeTheme.cpp
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@ -691,8 +691,13 @@ nsNativeTheme::IsDarkBackground(nsIFrame* aFrame)
return false;
nsIFrame* frame = scrollFrame->GetScrolledFrame();
nsStyleContext* bgSC;
if (nsCSSRendering::FindBackground(frame, &bgSC)) {
nsStyleContext* bgSC = nullptr;
if (!nsCSSRendering::FindBackground(frame, &bgSC) ||
bgSC->StyleBackground()->IsTransparent()) {
nsIFrame* backgroundFrame = nsCSSRendering::FindNonTransparentBackgroundFrame(frame, true);
nsCSSRendering::FindBackground(backgroundFrame, &bgSC);
}
if (bgSC) {
nscolor bgColor = bgSC->StyleBackground()->mBackgroundColor;
// Consider the background color dark if the sum of the r, g and b values is
// less than 384 in a semi-transparent document. This heuristic matches what