107804 2013-01-24 01:45:50 -0800 [mac] ImageBuffer should create accelerated buffers for small canvases, but we shouldn't force them to create compositing layers 2013-01-30 15:36:39 -0800 1 1 1 Unclassified WebKit Canvas 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 108310 1 thorton webkit-unassigned benjamin buildbot eric ojan.autocc rniwa sam simon.fraser webkit.review.bot oldest_to_newest 815243 0 thorton 2013-01-24 01:45:50 -0800 <rdar://problem/11752381> Mac WebKit is slower than it needs to be on http://www.mikechambers.com/html5/javascript/QuadTree/examples/collision.html because it makes lots of tiny canvases and draws them into a big one. The tiny ones fall below ImageBufferCG's "minIOSurfaceSize", so they are created in main memory. The big one is big, so it's an IOSurface. Painting between these is incredibly slow. The reason we cap ImageBuffer acceleration by size is so that small canvases (for example, http://typeface.neocracy.org/examples.html) don't force compositing (and then potentially cause overlap, and huge memory cost). But, we can still make IOSurfaces and still not pop them into compositing layers. So, let's do that! 815248 1 184441 thorton 2013-01-24 01:52:55 -0800 Created attachment 184441 patch name of the constant is a little wonky 815252 2 184441 thorton 2013-01-24 01:54:14 -0800 Comment on attachment 184441 patch View in context: https://bugs.webkit.org/attachment.cgi?id=184441&action=review > Source/WebCore/rendering/RenderLayerCompositor.cpp:1907 > + return canvas->renderingContext() && canvas->renderingContext()->isAccelerated() && (canvas->size().area() > canvasAreaThresholdRequiringCompositing); This is shared code, I wonder if this is reasonable for everyone... 815345 3 184441 buildbot 2013-01-24 05:09:15 -0800 Comment on attachment 184441 patch Attachment 184441 did not pass mac-ews (mac): Output: http://queues.webkit.org/results/16082655 New failing tests: fast/canvas/webgl/gl-pixelstorei.html fast/canvas/webgl/tex-image-webgl.html compositing/layer-creation/spanOverlapsCanvas.html 815509 4 184441 simon.fraser 2013-01-24 08:38:46 -0800 Comment on attachment 184441 patch View in context: https://bugs.webkit.org/attachment.cgi?id=184441&action=review >> Source/WebCore/rendering/RenderLayerCompositor.cpp:1907 >> + return canvas->renderingContext() && canvas->renderingContext()->isAccelerated() && (canvas->size().area() > canvasAreaThresholdRequiringCompositing); > > This is shared code, I wonder if this is reasonable for everyone... We should probably #ifdef it. Maybe USE_COMPOSITING_FOR_SMALL_CANVASES or something, disabled for PLATFORM(MAC) and PLATFORM(IOS). 815618 5 thorton 2013-01-24 10:52:00 -0800 (In reply to comment #3) > (From update of attachment 184441 [details]) > Attachment 184441 [details] did not pass mac-ews (mac): > Output: http://queues.webkit.org/results/16082655 > > New failing tests: > fast/canvas/webgl/gl-pixelstorei.html > fast/canvas/webgl/tex-image-webgl.html ... not a clue, but I can reproduce, so I'll look. > compositing/layer-creation/spanOverlapsCanvas.html This one uses a canvas at exactly the threshold and demonstrates that I should have used >= instead of > to match the < from before. 820597 6 185580 thorton 2013-01-30 14:40:23 -0800 Created attachment 185580 patch 820603 7 thorton 2013-01-30 14:42:22 -0800 Needs a WTF changelog. 820606 8 185582 thorton 2013-01-30 14:43:28 -0800 Created attachment 185582 patch 820631 9 185582 simon.fraser 2013-01-30 14:54:54 -0800 Comment on attachment 185582 patch View in context: https://bugs.webkit.org/attachment.cgi?id=185582&action=review > Source/WTF/wtf/Platform.h:1218 > +#if !PLATFORM(MAC) && !PLATFORM(IOS) > +#define WTF_USE_COMPOSITING_FOR_SMALL_CANVASES 1 > +#endif Please don't cause megawatts of energy use in making us all rebuild because of this #ifdef that's only used in one place. 820639 10 185589 thorton 2013-01-30 14:57:52 -0800 Created attachment 185589 Simon really doesn't like it when you touch Platform.h 820655 11 185589 simon.fraser 2013-01-30 15:05:47 -0800 Comment on attachment 185589 Simon really doesn't like it when you touch Platform.h View in context: https://bugs.webkit.org/attachment.cgi?id=185589&action=review > Source/WebCore/rendering/RenderLayerCompositor.cpp:1921 > + bool isCanvasLargeEnoughToForceCompositing = canvas->size().area() >= canvasAreaThresholdRequiringCompositing; Hmm, this looks at element size. Maybe we should composite based on the renderer dimensions? You might have a small canvas scaled up via CSS. 820700 12 185589 simon.fraser 2013-01-30 15:33:20 -0800 Comment on attachment 185589 Simon really doesn't like it when you touch Platform.h I think this is fine. 820706 13 thorton 2013-01-30 15:36:39 -0800 Thanks! http://trac.webkit.org/changeset/141333 184441 2013-01-24 01:52:55 -0800 2013-01-30 14:40:23 -0800 patch canvas-faster.diff text/plain 3643 thorton ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZyBiL1NvdXJjZS9XZWJDb3JlL0No YW5nZUxvZwppbmRleCBlN2JlMDhjLi4wMzM2NzNmIDEwMDY0NAotLS0gYS9Tb3VyY2UvV2ViQ29y ZS9DaGFuZ2VMb2cKKysrIGIvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMzAg QEAKKzIwMTMtMDEtMjQgIFRpbSBIb3J0b24gIDx0aW1vdGh5X2hvcnRvbkBhcHBsZS5jb20+CisK KyAgICAgICAgW21hY10gSW1hZ2VCdWZmZXIgc2hvdWxkIGNyZWF0ZSBhY2NlbGVyYXRlZCBidWZm ZXJzIGZvciBzbWFsbCBjYW52YXNlcywgYnV0IHdlIHNob3VsZG4ndCBmb3JjZSB0aGVtIHRvIGNy ZWF0ZSBjb21wb3NpdGluZyBsYXllcnMKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcv 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