218401 2020-10-30 12:56:44 -0700 [GPU Process] Flush canvas displayList from doAfterUpdateRendering 2020-11-03 13:25:18 -0800 1 1 1 Unclassified WebKit Canvas WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 rini_patel webkit-unassigned cdumez changseok dino esprehn+autocc ews-watchlist gyuyoung.kim sabouhallawa sam simon.fraser webkit-bug-importer wenson_hsieh oldest_to_newest 1703167 0 rini_patel 2020-10-30 12:56:44 -0700 <rdar://problem/70891766> 1703188 1 412791 rini_patel 2020-10-30 13:38:39 -0700 Created attachment 412791 Patch 1703191 2 412791 simon.fraser 2020-10-30 13:45:13 -0700 Comment on attachment 412791 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=412791&action=review > Source/WebCore/ChangeLog:8 > + > + No new tests (OOPS!). This needs some explanation for the change. Remove the "No new tests" line. > Source/WebCore/html/HTMLCanvasElement.cpp:373 > + if (m_context) > + addObserver(document()); I don't think you should do this unconditionally. You should only do this when GPU Process is active. In fact, you should only do this when GPU Process is active, and drawing has occurred since the last flush. > Source/WebCore/html/canvas/CanvasRenderingContext2DBase.h:310 > + bool needsPreparationForDisplay() const final { return true; } This can't be unconditional. You should only return true when using the GPU backend. Ideally it would only return true if there is new drawing. 1703579 3 412939 rini_patel 2020-11-02 10:27:11 -0800 Created attachment 412939 Patch 1703582 4 rini_patel 2020-11-02 10:33:56 -0800 (In reply to Simon Fraser (smfr) from comment #2) > Comment on attachment 412791 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=412791&action=review > > > Source/WebCore/ChangeLog:8 > > + > > + No new tests (OOPS!). > > This needs some explanation for the change. Remove the "No new tests" line. > > > Source/WebCore/html/HTMLCanvasElement.cpp:373 > > + if (m_context) > > + addObserver(document()); > > I don't think you should do this unconditionally. You should only do this > when GPU Process is active. In fact, you should only do this when GPU > Process is active, and drawing has occurred since the last flush. > > > Source/WebCore/html/canvas/CanvasRenderingContext2DBase.h:310 > > + bool needsPreparationForDisplay() const final { return true; } > > This can't be unconditional. You should only return true when using the GPU > backend. Ideally it would only return true if there is new drawing. We only flush from flushDrawingContextAndCommit() if there're new items in display list after the last flush. Should that be enough? 1703591 5 412939 sam 2020-11-02 10:49:54 -0800 Comment on attachment 412939 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=412939&action=review > Source/WebCore/html/HTMLCanvasElement.cpp:375 > +#if ENABLE(GPU_PROCESS) > + if (m_context) > + addObserver(document()); > +#endif It seems inherently wrong for WebCore to have to care about the GPU Process, so this #ifdef should really never be used in WebCore. 1703605 6 412939 simon.fraser 2020-11-02 11:04:28 -0800 Comment on attachment 412939 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=412939&action=review > Source/WebCore/html/HTMLCanvasElement.cpp:375 > +#if ENABLE(GPU_PROCESS) > + if (m_context) > + addObserver(document()); > +#endif This needs to be a runtime check not a compile-time check, and should only happen when we make a remote image buffer. > Source/WebCore/html/canvas/CanvasRenderingContext2DBase.cpp:2051 > + if (buffer && buffer->renderingResourceIdentifier()) I don't think checking for a renderingResourceIdentifier is the right approach. Maybe add ImageBuffer::flushContextAsync() and just call it always, then specialize the remote image buffer to flush the display list etc. 1703794 7 412996 rini_patel 2020-11-02 19:27:43 -0800 Created attachment 412996 Patch 1704045 8 412996 simon.fraser 2020-11-03 09:52:52 -0800 Comment on attachment 412996 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=412996&action=review Almost there! Let's do one more round. > Source/WebCore/html/canvas/CanvasRenderingContext2DBase.h:310 > + bool needsPreparationForDisplay() const final { return true; } This needs to also consult the buffer's shouldEagerlyFlush(), otherwise you've changed the behavior at Document::canvasChanged(). > Source/WebCore/platform/graphics/ImageBuffer.h:71 > + virtual bool shouldEagerlyFlush() { return false; } I'm trying to think of a better name for this. How about prefersPreparationForDisplay(). 1704099 9 413079 rini_patel 2020-11-03 11:19:11 -0800 Created attachment 413079 Patch 1704100 10 rini_patel 2020-11-03 11:19:54 -0800 Okay. Changed the method name. I think this should be close to what we're looking for. 1704116 11 413079 simon.fraser 2020-11-03 11:51:12 -0800 Comment on attachment 413079 Patch Let's wait for the Windows bot. 1704142 12 rini_patel 2020-11-03 12:34:31 -0800 Looks like it failed on first run and passed on retry. 1704143 13 rini_patel 2020-11-03 12:35:44 -0800 Is it concerning? (In reply to Rini Patel from comment #12) > Looks like it failed on first run and passed on retry. 1704144 14 wenson_hsieh 2020-11-03 12:37:03 -0800 (In reply to Rini Patel from comment #13) > Is it concerning? > (In reply to Rini Patel from comment #12) > > Looks like it failed on first run and passed on retry. The Windows test failure (fast/visual-viewport/resize-event-fired-window-resized.html) looks unrelated — we're probably okay. 1704194 15 ews-feeder 2020-11-03 13:24:22 -0800 Committed r269331: <https://trac.webkit.org/changeset/269331> All reviewed patches have been landed. Closing bug and clearing flags on attachment 413079. 1704195 16 webkit-bug-importer 2020-11-03 13:25:18 -0800 <rdar://problem/71008643> 412791 2020-10-30 13:38:39 -0700 2020-11-02 10:27:08 -0800 Patch bug-218401-20201030133838.patch text/plain 5909 rini_patel U3VidmVyc2lvbiBSZXZpc2lvbjogMjY5MjAzCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZDFkMTM3MWU4MDU2NWVi NzgxMGVmOTk0M2FmOWMzOTFiY2IyNzZkMS4uMTliZmE4NDVmZGQ4MGUzYzY4MWYzYWQ1ZGMwOTc1 MWE3Y2E1MzNiNCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIxIEBACisyMDIwLTEwLTMwICBSaW5p IFBhdGVsICA8cmluaV9wYXRlbEBhcHBsZS5jb20+CisKKyAgICAgICAgW0dQVSBQcm9jZXNzXSBG bHVzaCBjYW52YXMgZGlzcGxheUxpc3QgZnJvbSBkb0FmdGVyVXBkYXRlUmVuZGVyaW5nCisgICAg ICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMTg0MDEKKworICAg ICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBObyBuZXcgdGVzdHMg 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