169943 2017-03-21 20:12:51 -0700 When the browser window is activated or deactivated, images can flash 2017-05-29 15:53:51 -0700 1 1 1 Unclassified WebKit Images WebKit Local Build Unspecified Unspecified RESOLVED DUPLICATE 170640 InRadar P2 Normal --- 1 simon.fraser webkit-unassigned cdumez jonlee kling sabouhallawa simon.fraser webkit-bug-importer oldest_to_newest 1289951 0 simon.fraser 2017-03-21 20:12:51 -0700 We can get flashes of undecided images when the browser window goes between foreground and background. This happens because tile size changes trigger painting, and we may have thrown away decoded data via the MemoryCache pruning timer, so we have to re-decode async and thus flash. 1289956 1 simon.fraser 2017-03-21 20:48:05 -0700 So the memory cache prunes on a timer, and destroys decoded image data via: * frame #0: 0x0000000117c78a9c WebCore`WebCore::BitmapImage::destroyDecodedData(this=0x0000000123a345c0, destroyAll=true) at BitmapImage.cpp:68 frame #1: 0x0000000117cbade3 WebCore`WebCore::CachedImage::destroyDecodedData(this=0x00000001297bf200) at CachedImage.cpp:489 frame #2: 0x0000000119987629 WebCore`WebCore::MemoryCache::pruneLiveResourcesToSize(this=0x000000011b9ff1d0, targetSize=95630128, shouldDestroyDecodedDataForAllLiveResources=false) at MemoryCache.cpp:338 frame #3: 0x0000000119987486 WebCore`WebCore::MemoryCache::pruneLiveResources(this=0x000000011b9ff1d0, shouldDestroyDecodedDataForAllLiveResources=false) at MemoryCache.cpp:265 frame #4: 0x000000011998526a WebCore`WebCore::MemoryCache::prune(this=0x000000011b9ff1d0) at MemoryCache.cpp:731 ... frame #10: 0x000000011998cff9 WebCore`std::__1::__function::__func<std::__1::__bind<void (WebCore::MemoryCache::*&)(), WebCore::MemoryCache*>, std::__1::allocator<std::__1::__bind<void (WebCore::MemoryCache::*&)(), WebCore::MemoryCache*> >, void ()>::operator(this=0x000000011b9ff3a0)() at functional:1437 frame #11: 0x0000000117ab6b0a WebCore`std::__1::function<void ()>::operator(this=0x000000011b9ff3a0)() const at functional:1817 frame #12: 0x0000000117ab6a29 WebCore`WebCore::Timer::fired(this=0x000000011b9ff360) at Timer.h:148 1290477 2 webkit-bug-importer 2017-03-23 09:38:13 -0700 <rdar://problem/31221177> 1313402 3 simon.fraser 2017-05-27 08:21:13 -0700 Said, I think you've fixed this? 1313616 4 jonlee 2017-05-29 15:53:51 -0700 *** This bug has been marked as a duplicate of bug 170640 ***