103424 2012-11-27 09:06:51 -0800 [Qt] A new compositing bug uncovered by r135859 2014-02-03 03:23:44 -0800 1 1 1 Unclassified WebKit New Bugs 420+ All All RESOLVED INVALID P2 Normal --- 87008 103275 1 ossy webkit-unassigned allan.jensen hausmann junov ossy simon.fraser oldest_to_newest 776830 0 ossy 2012-11-27 09:06:51 -0800 fast/backgrounds/background-opaque-images-over-color.html started to fail on Qt after r135859 and r135861 - refactoring to reftest See https://bugs.webkit.org/show_bug.cgi?id=103275 for details. Image diff on the Qt bot: http://build.webkit.sed.hu/results/x86-64%20Linux%20Qt%20Release/r135862%20%2845465%29/fast/backgrounds/background-opaque-images-over-color-diffs.html 776835 1 ossy 2012-11-27 09:13:08 -0800 I skipped it by r135865. Please unskip it with the proper fix. 807391 2 allan.jensen 2013-01-15 09:54:49 -0800 It seems to be case 3 and case 8 that that fails. <div id="case_3" class="redBack" style="background-image: -webkit-cross-fade(url(../../http/tests/multipart/resources/green-100x100.png), url(../../http/tests/multipart/resources/green-100x100.png), 50%)"></div> <div id="case_9" class="redBack" style="background-repeat: no-repeat; background-image: url(../../http/tests/multipart/resources/green-100x100.png),url(resources/64x32-red.png)"></div> So it appears cross-fading between two identical images produces something that is not an identical image. 808201 3 allan.jensen 2013-01-16 02:23:46 -0800 A quick investigation shows that cross-fading images is crossplatform code. It does however rely on a PLUS composition to ensure the two images opacity adds up to 100%. It could appear that QPainter does not composition opacity values set by QPainter::setOpacity but only thoses in the alpha values of painted images. 975609 4 jturcotte 2014-02-03 03:23:44 -0800 === Bulk closing of Qt bugs === If you believe that this bug report is still relevant for a non-Qt port of webkit.org, please re-open it and remove [Qt] from the summary. If you believe that this is still an important QtWebKit bug, please fill a new report at https://bugreports.qt-project.org and add a link to this issue. See http://qt-project.org/wiki/ReportingBugsInQt for additional guidelines.