67404 2011-09-01 07:54:10 -0700 [cairo] GraphicsContextCairo::FillRect with a solid colour does not respect operator 2012-04-25 08:37:48 -0700 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) Unspecified Unspecified RESOLVED DUPLICATE 84848 P2 Normal --- 0 rob webkit-unassigned d-r mrobinson oldest_to_newest 460460 0 rob 2011-09-01 07:54:10 -0700 In the GraphicsContext function: void GraphicsContext::fillRect(const FloatRect& rect, const Color& color, ColorSpace styleColorSpace, CompositeOperator op) (which is not overridden in the GraphicsContextCairo) It sets the operator and then proceeds to call the fillRect(const FloatRect& rect, const Color& color, ColorSpace styleColorSpace) (i.e. the version without the operator) The problem is that the fillRectWithColor in GraphicsContextCairo.cpp always uses the OVER operator. Without respecting the operator I think we would see incorrect results from code that triggers " if (baseColor.alpha()) { if (bgColor.alpha()) baseColor = baseColor.blend(bgColor); context->fillRect(backgroundRect, baseColor, style()->colorSpace(), CompositeCopy); } else if (bgColor.alpha()) { CompositeOperator operation = shouldClearBackground ? CompositeCopy : context->compositeOperation(); context->fillRect(backgroundRect, bgColor, style()->colorSpace(), operation); } else if (shouldClearBackground) context->clearRect(backgroundRect); " from RenderBoxModelObject::paintFillLayerExtended 460477 1 105968 rob 2011-09-01 08:20:39 -0700 Created attachment 105968 Proposed patch 460480 2 105969 rob 2011-09-01 08:28:20 -0700 Created attachment 105969 Fix gramatical errors in the ChangeLog entry on the original patch 460542 3 mrobinson 2011-09-01 10:01:11 -0700 Do you have a test case where this fails? In what cases would this lead to degraded performance? 460588 4 rob 2011-09-01 10:40:57 -0700 (In reply to comment #3) > Do you have a test case where this fails? In what cases would this lead to degraded performance? I observed this bug by observation of the code. I will try and figure out a test case that triggers a visual issue because of this bug. In terms of performance painting with OVER is more costly than SOURCE since SOURCE can be optimised to a blit by Cairo in many situations (since it doesn't depend on the value that is currently in the destination.) 465030 5 mrobinson 2011-09-09 14:40:29 -0700 (In reply to comment #4) > In terms of performance painting with OVER is more costly than SOURCE since SOURCE can be optimised to a blit by Cairo in many situations (since it doesn't depend on the value that is currently in the destination.) Thanks. This is very likely a bug! 524165 6 105969 eric 2011-12-19 13:53:00 -0800 Comment on attachment 105969 Fix gramatical errors in the ChangeLog entry on the original patch View in context: https://bugs.webkit.org/attachment.cgi?id=105969&action=review How do we test this? > Source/WebCore/ChangeLog:5 > + Please don't remove the REviewed by line, otherwise the tools can't fill it in fo ryou. 609791 7 mrobinson 2012-04-25 08:32:37 -0700 *** Bug 84848 has been marked as a duplicate of this bug. *** 609798 8 mrobinson 2012-04-25 08:37:48 -0700 *** This bug has been marked as a duplicate of bug 84848 *** 105968 2011-09-01 08:20:39 -0700 2011-09-01 08:28:20 -0700 Proposed patch 0001-Cairo-GraphicsContext-fillRect-ignores-operator-that.patch text/plain 3459 rob RnJvbSBjOTc5NThkNDM1YTlkMGQ1MTc2NGFhOTgzMjgxOGUzYTI5YzBlNmJhIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBSb2IgQnJhZGZvcmQgPHJvYkBsaW51eC5pbnRlbC5jb20+CkRh dGU6IFRodSwgMSBTZXAgMjAxMSAxNjoxODo0NyArMDEwMApTdWJqZWN0OiBbUEFUQ0hdIFtDYWly 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