208482 2020-03-02 15:48:54 -0800 Canvas content should factor into visually-non-empty heuristic 2020-04-13 13:56:13 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Local Build Unspecified Unspecified RESOLVED WORKSFORME InRadar P2 Normal --- 208500 1 nham zalan bfulgham cdumez darin dino esprehn+autocc ews-watchlist fmalita glenn gyuyoung.kim kondapallykalyan nham noam pdr sabouhallawa schenney sergio simon.fraser webkit-bug-importer zalan oldest_to_newest 1624789 0 nham 2020-03-02 15:48:54 -0800 Currently, we block the initial render on our "visually non-empty" heuristic. This heuristic depends on (among other things) how much text is in the document, how many image pixels are in the document, and whether or not the main resource is fully parsed. However, SVG and canvas content is not considered by the heuristic. This causes a delayed first contentful paint for certain websites. For instance, YouTube's first contentful paint is often delayed until far after the main HTML resource is parsed: 1. They don't ship down any text initially, so we won't trip over the visually non-empty character threshold 2. They don't ship down any actual images initially, so we won't trip over the filled-image-pixel threshold (everything that looks like an image is actually an SVG) 3. On an uncached load, we won't paint after parsing the initial HTML either, since there's usually an outstanding web font loading, and our heuristic delays the first paint until the web fonts load if there isn't enough character or image content We could improve our FCP for YT and other similar sites by including an estimate of SVG and canvas content sizes in the visually-non-empty heuristic. This will also improve FCP as reported by https://w3c.github.io/paint-timing/#first-contentful-paint. 1624791 1 webkit-bug-importer 2020-03-02 15:49:26 -0800 <rdar://problem/59971943> 1624792 2 nham 2020-03-02 15:49:55 -0800 Assigning to Alan since he said he could take a look at this. 1624940 3 392248 zalan 2020-03-02 21:38:16 -0800 Created attachment 392248 Patch 1625138 4 392248 simon.fraser 2020-03-03 11:02:24 -0800 Comment on attachment 392248 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=392248&action=review > Source/WebCore/rendering/svg/RenderSVGRoot.cpp:62 > + if (this->style().width().isFixed() && this->style().height().isFixed()) > + view().frameView().incrementVisuallyNonEmptyPixelCount({ this->style().width().intValue(), this->style().height().intValue() }); Don't you need to convert non-pixel fixed types to pixels? 1626268 5 zalan 2020-03-05 13:25:42 -0800 SVG content is tracked over here bug 208663 1636406 6 395137 noam 2020-04-01 00:21:49 -0700 Created attachment 395137 Patch 1636407 7 noam 2020-04-01 00:25:14 -0700 Alan, I hope it's OK that I took a crack at this! Trying to match canvas VNE behavior to FCP, as requested in https://bugs.webkit.org/show_bug.cgi?id=78011#c7 I know that this still has the same problem as https://bugs.webkit.org/show_bug.cgi?id=208501#c14, thinking we can fix those in one go. 1636595 8 395137 simon.fraser 2020-04-01 12:01:04 -0700 Comment on attachment 395137 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395137&action=review Why no test? > Source/WebCore/ChangeLog:12 > + Reviewed by NOBODY (OOPS!). This goes above the description. > Source/WebCore/html/HTMLCanvasElement.cpp:465 > + didAttachContext(); > // Need to make sure a RenderLayer and compositing layer get created for the Canvas. > invalidateStyleAndLayerComposition(); Why is this in a different order to the previous one? > Source/WebCore/rendering/RenderHTMLCanvas.cpp:113 > + view().frameView().incrementVisuallyNonEmptyPixelCount(ceiledIntSize(intrinsicSize())); When called from the constructor, is intrinsicSize set yet? 1636598 9 395137 noam 2020-04-01 12:05:17 -0700 Comment on attachment 395137 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395137&action=review >> Source/WebCore/ChangeLog:12 >> + Reviewed by NOBODY (OOPS!). > > This goes above the description. Gotcha >> Source/WebCore/html/HTMLCanvasElement.cpp:465 >> invalidateStyleAndLayerComposition(); > > Why is this in a different order to the previous one? No reason, will make more consistent. >> Source/WebCore/rendering/RenderHTMLCanvas.cpp:113 >> + view().frameView().incrementVisuallyNonEmptyPixelCount(ceiledIntSize(intrinsicSize())); > > When called from the constructor, is intrinsicSize set yet? I believe so. Will make sure. 1636599 10 noam 2020-04-01 12:05:55 -0700 (In reply to Simon Fraser (smfr) from comment #8) > Comment on attachment 395137 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=395137&action=review > > Why no test? Can I get some pointers to how this kind of feature is tested? https://trac.webkit.org/changeset/257952/webkit, for example, adds similar functionality and did not add tests. 1636619 11 395137 noam 2020-04-01 13:05:48 -0700 Comment on attachment 395137 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395137&action=review >>> Source/WebCore/rendering/RenderHTMLCanvas.cpp:113 >>> + view().frameView().incrementVisuallyNonEmptyPixelCount(ceiledIntSize(intrinsicSize())); >> >> When called from the constructor, is intrinsicSize set yet? > > I believe so. Will make sure. Actually, it has to be available, since the rendering context is available. 1636629 12 395137 darin 2020-04-01 13:32:35 -0700 Comment on attachment 395137 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395137&action=review > Source/WebCore/html/HTMLCanvasElement.cpp:927 > + auto& canvasRenderer = downcast<RenderHTMLCanvas>(*renderer); > + canvasRenderer.didAttachContext(); Better as a one-liner: downcast<RenderHTMLCanvas>(*renderer).didAttachContext(); 1636815 13 395245 noam 2020-04-02 00:05:22 -0700 Created attachment 395245 Patch 1640964 14 noam 2020-04-13 10:30:26 -0700 Seems like this was fixed in https://trac.webkit.org/changeset/257899/webkit 1641047 15 395245 zalan 2020-04-13 12:48:02 -0700 Comment on attachment 395245 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395245&action=review > Source/WebCore/rendering/RenderHTMLCanvas.cpp:115 > +void RenderHTMLCanvas::incrementVisuallyNonEmptyPixelCountIfNeeded() > +{ > + if (m_didIncrementVisuallyNonEmptyPixelCount) > + return; > + > + view().frameView().incrementVisuallyNonEmptyPixelCount(ceiledIntSize(intrinsicSize())); > + m_didIncrementVisuallyNonEmptyPixelCount = true; > +} This is another example where this logic would be much better in a dedicated first paint class with all the tracking. 1641062 16 noam 2020-04-13 13:09:47 -0700 (In reply to zalan from comment #15) > Comment on attachment 395245 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=395245&action=review > > > Source/WebCore/rendering/RenderHTMLCanvas.cpp:115 > > +void RenderHTMLCanvas::incrementVisuallyNonEmptyPixelCountIfNeeded() > > +{ > > + if (m_didIncrementVisuallyNonEmptyPixelCount) > > + return; > > + > > + view().frameView().incrementVisuallyNonEmptyPixelCount(ceiledIntSize(intrinsicSize())); > > + m_didIncrementVisuallyNonEmptyPixelCount = true; > > +} > > This is another example where this logic would be much better in a dedicated > first paint class with all the tracking. I saw that you already made canvas increment the pixel count in https://trac.webkit.org/changeset/257899/webkit, isn't this patch superfluous now? 1641086 17 395245 simon.fraser 2020-04-13 13:47:17 -0700 Comment on attachment 395245 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395245&action=review > Source/WebCore/rendering/RenderHTMLCanvas.h:54 > + bool m_didIncrementVisuallyNonEmptyPixelCount { false }; Why doesn't this use RenderElement's didMarkFor...? 1641092 18 395245 noam 2020-04-13 13:54:38 -0700 Comment on attachment 395245 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395245&action=review >> Source/WebCore/rendering/RenderHTMLCanvas.h:54 >> + bool m_didIncrementVisuallyNonEmptyPixelCount { false }; > > Why doesn't this use RenderElement's didMarkFor...? Oh damn! It was added after this patch. Will fix. But I want to know first if this is even needed, given https://trac.webkit.org/changeset/257899/webkit 1641093 19 noam 2020-04-13 13:56:13 -0700 (In reply to Noam Rosenthal from comment #18) > Comment on attachment 395245 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=395245&action=review > > >> Source/WebCore/rendering/RenderHTMLCanvas.h:54 > >> + bool m_didIncrementVisuallyNonEmptyPixelCount { false }; > > > > Why doesn't this use RenderElement's didMarkFor...? > > Oh damn! It was added after this patch. Will fix. But I want to know first > if this is even needed, given https://trac.webkit.org/changeset/257899/webkit Ah it was in my other patch... sure. I will revise this after the bg-image patch goes in, once we figure out if this is needed... 392248 2020-03-02 21:38:16 -0800 2020-03-05 13:25:13 -0800 Patch bug-208482-20200302213815.patch text/plain 1555 zalan U3VidmVyc2lvbiBSZXZpc2lvbjogMjU3NzQ2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZDBmYzU4YWNmNzZjODE5 NGNkMDA5YWU2ODY1MDg0OGVjN2RhNDI2ZS4uYmM0MTBhMzU2M2NmZjhjODI3NDc0YmNiN2IwOTFk YWIyOTY3NmNiNCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE2IEBACisyMDIwLTAzLTAyICBaYWxh biBCdWp0YXMgIDx6YWxhbkBhcHBsZS5jb20+CisKKyAgICAgICAgU1ZHIGFuZCBDYW52YXMgY29u dGVudCBzaG91bGQgZmFjdG9yIGludG8gdmlzdWFsbHktbm9uLWVtcHR5IGhldXJpc3RpYworICAg ICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjA4NDgyCisgICAg ICAgIDxyZGFyOi8vcHJvYmxlbS81OTk3MTk0Mz4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JP RFkgKE9PUFMhKS4KKworICAgICAgICBXSVAuIExldCdzIGp1c3Qgc3RhcnQgd2l0aCBmaXhlZCBn 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