201727 2019-09-12 11:01:30 -0700 ImageDecoders: use a thread safe data buffer for Cairo backing store 2019-10-30 00:59:10 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=202807 InRadar P2 Normal --- 203488 1 cturner cturner bugs-noreply cgarcia clopez commit-queue fujii magomez webkit-bug-importer zan oldest_to_newest 1570301 0 cturner 2019-09-12 11:01:30 -0700 ImageDecoders: use a thread safe data buffer for Cairo backing store 1570304 1 378659 cturner 2019-09-12 11:10:17 -0700 Created attachment 378659 Patch 1571139 2 cturner 2019-09-16 09:52:05 -0700 This is sometimes crashing in release builds only, i'm starting to suspect the compiler, but in the meantime it's not ready for landing it seems. 1582892 3 clopez 2019-10-23 11:09:27 -0700 This has been here ignored because there isn't any reviewer CC'ed. Next time try to CC any reviewer. You can pass the flag "--suggest-reviewers" to the webkit-patch tool and it will automatically suggest them 1583246 4 magomez 2019-10-23 23:51:38 -0700 This totally makes sense. The introduction of async image decoding is what caused buffers to be accessed from different threads (before that everything happened on the main thread). The patch looks good IMO. 1583254 5 378659 cgarcia 2019-10-24 00:10:06 -0700 Comment on attachment 378659 Patch Do we only need the refcounting to be thread safe? or also the data can be accessed from multiple threads? because in that case we would need a lock to protect the pixels, no? 1583257 6 magomez 2019-10-24 00:41:54 -0700 (In reply to Carlos Garcia Campos from comment #5) > Comment on attachment 378659 [details] > Patch > > Do we only need the refcounting to be thread safe? or also the data can be > accessed from multiple threads? because in that case we would need a lock to > protect the pixels, no? The buffer is going to be created on the decoding thread and filled there. Once the decoding is finished a repaint is requested and at that point it's when the main thread will start accessing the buffer contents, and the decoding thread shouldn't be accessing it anymore. So I don't think the data can be accessed from both threads at the same time. 1583259 7 cgarcia 2019-10-24 00:53:46 -0700 (In reply to Miguel Gomez from comment #6) > (In reply to Carlos Garcia Campos from comment #5) > > Comment on attachment 378659 [details] > > Patch > > > > Do we only need the refcounting to be thread safe? or also the data can be > > accessed from multiple threads? because in that case we would need a lock to > > protect the pixels, no? > > The buffer is going to be created on the decoding thread and filled there. > Once the decoding is finished a repaint is requested and at that point it's > when the main thread will start accessing the buffer contents, and the > decoding thread shouldn't be accessing it anymore. So I don't think the data > can be accessed from both threads at the same time. Ok, it doesn't matter much because it's a private helper class, but I think I would rename it as RGBAPixelBufferThreadSafeRefCounted to make it clearer. 1583260 8 378659 cgarcia 2019-10-24 00:54:59 -0700 Comment on attachment 378659 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=378659&action=review > Source/WebCore/platform/graphics/ImageBackingStore.h:188 > + class ThreadSafeRGBAPixelBuffer : public ThreadSafeRefCounted<ThreadSafeRGBAPixelBuffer> { As I suggested in the comments I would rename this, because this name is confusing. 1583685 9 378659 zan 2019-10-24 23:29:30 -0700 Comment on attachment 378659 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=378659&action=review > Source/WebCore/platform/graphics/ImageBackingStore.h:199 > + m_isValid = m_pixels.tryReserveCapacity(initialSize.area().unsafeGet()); This operation on Vector, as name suggests, only reserve-expands the capacity -- it doesn't change the size of it. But the zero-fill in zeroPixelData() does fill the Vector's data based on the size, i.e. it zeroes out nothing. An additional Vector<>::resize() call here (if reservation was successful) would avoid that. 1584394 10 382052 cturner 2019-10-28 02:16:01 -0700 Created attachment 382052 Patch for landing 1584395 11 382053 cturner 2019-10-28 02:16:43 -0700 Created attachment 382053 Patch for landing 1584396 12 382054 cturner 2019-10-28 02:17:35 -0700 Created attachment 382054 Patch for landing 1584408 13 commit-queue 2019-10-28 03:11:58 -0700 The commit-queue encountered the following flaky tests while processing attachment 382054: imported/w3c/web-platform-tests/css/css-position/position-absolute-container-dynamic-002.html bug 203473 (author: simon.fraser@apple.com) imported/w3c/web-platform-tests/css/css-position/position-absolute-crash-chrome-005.html bug 203474 (author: simon.fraser@apple.com) imported/w3c/web-platform-tests/html/semantics/scripting-1/the-script-element/module/integrity.html bug 203394 (author: ysuzuki@apple.com) The commit-queue is continuing to process your patch. 1584409 14 382054 commit-queue 2019-10-28 03:12:50 -0700 Comment on attachment 382054 Patch for landing Clearing flags on attachment: 382054 Committed r251651: <https://trac.webkit.org/changeset/251651> 1584410 15 commit-queue 2019-10-28 03:12:52 -0700 All reviewed patches have been landed. Closing bug. 1584412 16 webkit-bug-importer 2019-10-28 03:13:17 -0700 <rdar://problem/56665041> 1584444 17 cgarcia 2019-10-28 07:58:01 -0700 I had to revert this locally because it's causing crashes here with my riot ephjy web app (I don't know why it doesn't happen with normal ephy). It's crashing when creating the favicon, see: Thread 1 (Thread 0x7fffeaf03cc0 (LWP 2247)): #0 0x00007ffff53b91f0 in WebCore::ImageBackingStore::image() const () from /home/cgarcia/gnome/lib/libwebkit2gtk-4.0.so.37 #1 0x00007ffff53a87b1 in WebCore::ScalableImageDecoder::createFrameImageAtIndex(unsigned long, WebCore::SubsamplingLevel, WebCore::DecodingOptions const&) () from /home/cgarcia/gnome/lib/li--Type <RET> for more, q to quit, c to continue without paging-- bwebkit2gtk-4.0.so.37 #2 0x00007ffff4ce65f3 in WebCore::ImageSource::frameAtIndexCacheIfNeeded(unsigned long, WebCore::ImageFrame::Caching, WTF::Optional<WebCore::SubsamplingLevel> const&) () from /home/cgarcia/gnome/lib/libwebkit2gtk-4.0.so.37 #3 0x00007ffff4ce6830 in WebCore::ImageSource::frameImageAtIndexCacheIfNeeded(unsigned long, WebCore::SubsamplingLevel) () from /home/cgarcia/gnome/lib/libwebkit2gtk-4.0.so.37 #4 0x00007ffff4c87297 in WebCore::BitmapImage::frameImageAtIndexCacheIfNeeded(unsigned long, WebCore::SubsamplingLevel, WebCore::GraphicsContext const*) () from /home/cgarcia/gnome/lib/libwebkit2gtk-4.0.so.37 #5 0x00007ffff4c872f3 in WebCore::BitmapImage::nativeImageForCurrentFrame(WebCore::GraphicsContext const*) () from /home/cgarcia/gnome/lib/libwebkit2gtk-4.0.so.37 #6 0x00007ffff3827d2e in WTF::Detail::CallableWrapper<WebKit::IconDatabase::loadIconForPageURL(WTF::String const&, WebKit::IconDatabase::AllowDatabaseWrite, WTF::CompletionHandler<void (WTF::RefPtr<_cairo_surface, WTF::DumbPtrTraits<_cairo_surface> >&&)>&&)::{lambda()#1}::operator()()::{lambda()#1}, void>::call() () from /home/cgarcia/gnome/lib/libwebkit2gtk-4.0.so.37 #7 0x00007ffff1697f85 in WTF::RunLoop::performWork() () from /home/cgarcia/gnome/lib/libjavascriptcoregtk-4.0.so.18 #8 0x00007ffff16f4a29 in WTF::RunLoop::RunLoop()::{lambda(void*)#1}::_FUN(void*) () from /home/cgarcia/gnome/lib/libjavascriptcoregtk-4.0.so.18 #9 0x00007ffff74a6a1e in g_main_dispatch (context=0x55555567f120) at ../glib/gmain.c:3179 #10 g_main_context_dispatch (context=context@entry=0x55555567f120) at ../glib/gmain.c:3844 #11 0x00007ffff74a6da0 in g_main_context_iterate (context=context@entry=0x55555567f120, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:3917 #12 0x00007ffff74a6e2f in g_main_context_iteration (context=context@entry=0x55555567f120, may_block=may_block@entry=1) at ../glib/gmain.c:3978 #13 0x00007ffff76a9a4d in g_application_run (application=0x55555595c2e0, argc=<optimized out>, argv=<optimized out>) at ../gio/gapplication.c:2559 #14 0x0000555555559bf9 in main (argc=1, argv=0x7fffffffd928) at ../src/ephy-main.c:427 1584446 18 cgarcia 2019-10-28 08:01:36 -0700 Bots are also exiting early after r251651 due to crashes, so I'll roll this out. 1584448 19 commit-queue 2019-10-28 08:02:31 -0700 Re-opened since this is blocked by bug 203488 1584800 20 fujii 2019-10-28 19:27:17 -0700 *** Bug 203546 has been marked as a duplicate of this bug. *** 1584876 21 382054 cgarcia 2019-10-29 03:36:12 -0700 Comment on attachment 382054 Patch for landing View in context: https://bugs.webkit.org/attachment.cgi?id=382054&action=review This patch can be simplified simply using SharedBuffer::DataSegment which is already thread safe ref counted. > Source/WebCore/platform/graphics/ImageBackingStore.h:-205 > - m_pixels = SharedBuffer::create(other.m_pixels->data(), other.m_pixels->size()); > - m_pixelsPtr = reinterpret_cast<RGBA32*>(const_cast<char*>(m_pixels->data())); I think this is the problem, we actually need to copy the data here. 1584877 22 382173 cgarcia 2019-10-29 03:38:02 -0700 Created attachment 382173 Patch 1584913 23 382173 cturner 2019-10-29 08:11:52 -0700 Comment on attachment 382173 Patch It LGTM, I come to same conclusion about the copy ctor and was about to upload :-), but the DataSegment is much nicer, thanks for taking a look! 1585299 24 cgarcia 2019-10-30 00:59:10 -0700 Committed r251771: <https://trac.webkit.org/changeset/251771> 378659 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