63871 2011-07-03 02:41:49 -0700 [Chromium] canvas/philip/tests/2d.gradient.object.update.html is failed on chromium. 2011-07-11 18:22:43 -0700 1 1 1 Unclassified WebKit Canvas 528+ (Nightly build) Unspecified Linux RESOLVED DUPLICATE 64281 P2 Normal --- 0 dongseong.hwang webkit-unassigned dongseong.hwang eric jamesr kbr mdelaney7 reed rwlbuis senorblanco skyul zimmermann oldest_to_newest 431685 0 dongseong.hwang 2011-07-03 02:41:49 -0700 From HTML5 canvas spec: http://dev.w3.org/html5/2dcontext/#colors-and-styles "When set to a CanvasPattern or CanvasGradient object, the assignment is live, meaning that changes made to the object after the assignment do affect subsequent stroking or filling of shapes." However, after setting CanvasPattern or CanvasGradient object and changing the object, changes made to the object after the assignment do not affect subsequent stroking or filling of shapes on chromium. 431686 1 99570 dongseong.hwang 2011-07-03 02:52:03 -0700 Created attachment 99570 patch 431687 2 dongseong.hwang 2011-07-03 02:54:30 -0700 [Chromium] Update Gradient and Pattern every time to draw similar to PlatformContext::prepareForSoftwareDraw() GraphicsContextSkia::set[Fill|Stroke][Gradient|Pattern] has the problem that GraphicsContextSkia does not apply gradient or pattern style if the gradient or pattern is changed after GraphicsContextSkia::set[Fill|Stroke][Gradient|Pattern]. For example, Gradient* gradient; gradient->doSomething(); graphicsContext.setFillGradient(gradient); gradient->addColorStop(...); <- GraphicsContextSkia does not apply this. It is because GraphicsContextSkia creates new platform gradient or pattern object and it would be different from original gradient or pattern object in the above case. This patch makes Chromium comform following Canvas spec. From HTML5 canvas spec: http://dev.w3.org/html5/2dcontext/#colors-and-styles "When set to a CanvasPattern or CanvasGradient object, the assignment is live, meaning that changes made to the object after the assignment do affect subsequent stroking or filling of shapes." This patch makes chromium pass canvas/philip/tests/2d.gradient.object.update.html 432497 3 eric 2011-07-05 17:50:04 -0700 Really? We need to call that in so many places? 432536 4 99773 dongseong.hwang 2011-07-05 18:44:09 -0700 Created attachment 99773 patch 432548 5 99773 dongseong.hwang 2011-07-05 18:52:32 -0700 Comment on attachment 99773 patch I think we need to call before all drawing. I separated stroke and fill updates like CG port. CG calls those only on fillPath, fillRect, drawRect, strokePath, and strokRect because other drawing functions render through fillPath, fillRect, drawRect, strokePath, and strokRect. However, skia drawing function directly call SkCanvas's drawing functions. I wonders how I handle drawLineForTextChecking and drawLineForText. I put both applyStrokePatternOrGradient and applyFillPatternOrGradient in those. I need advice. 434023 6 reed 2011-07-08 06:03:30 -0700 I agree this looks very invasive. Looking further up, I wonder why skia has this dual between graphicscontext->m_state (which has the gradient) and platformcontext which has the skia gradient. I notice the the webkit Gradient object itself holds a cache of the skia gradient, and it is correctly purged when addColorStop is called. If skia always went directly to m_state.fillGradient, I think we could skip all of these pushes. Another clue that something funny is going on. Look in GraphicsContext.cpp #if !USE(SKIA) void GraphicsContext::setPlatformFillGradient(Gradient*) { } void GraphicsContext::setPlatformFillPattern(Pattern*) { } void GraphicsContext::setPlatformStrokeGradient(Gradient*) { } void GraphicsContext::setPlatformStrokePattern(Pattern*) { } #endif All of these seem to exist solely for skia. If we didn't make a (premature) copy of the gradient, but reached directly into m_state each time, I think we would (a) fix this bug, and (b) avoid this whole layer of indirection/copying. 434142 7 senorblanco 2011-07-08 10:43:22 -0700 (In reply to comment #6) > I agree this looks very invasive. Looking further up, I wonder why skia has this dual between graphicscontext->m_state (which has the gradient) and platformcontext which has the skia gradient. I notice the the webkit Gradient object itself holds a cache of the skia gradient, and it is correctly purged when addColorStop is called. If skia always went directly to m_state.fillGradient, I think we could skip all of these pushes. > > Another clue that something funny is going on. Look in GraphicsContext.cpp > > > #if !USE(SKIA) > void GraphicsContext::setPlatformFillGradient(Gradient*) > { > } > > void GraphicsContext::setPlatformFillPattern(Pattern*) > { > } > > void GraphicsContext::setPlatformStrokeGradient(Gradient*) > { > } > > void GraphicsContext::setPlatformStrokePattern(Pattern*) > { > } > #endif > > All of these seem to exist solely for skia. If we didn't make a (premature) copy of the gradient, but reached directly into m_state each time, I think we would (a) fix this bug, and (b) avoid this whole layer of indirection/copying. I'm to blame for introducing these, in: http://trac.webkit.org/changeset/46017 It was to refactor a bunch of cut-and-paste code, so that setupPaintForStroking() and setupPaintForFilling() could handle patterns and gradients, rather than having to cut-and-paste the same 5 lines of code we were using everywhere else for gradients and patterns (see the CL desc). That may not be relevant anymore; I'm not sure. But anything we come up with should be checked against the tests that were fixed in that CL, at least. 434151 8 reed 2011-07-08 10:53:53 -0700 Ah, that helps. Certainly will explicitly check for regressions against those tests (and all of DRT). I have a preliminary CL https://bugs.webkit.org/show_bug.cgi?id=64178 that is good in its own right, but will simplify a future CL (which I haven't posted yet) where I think we can address these gradient concerns w/o the extra calls proposed here. 434363 9 99773 jamesr 2011-07-08 16:06:57 -0700 Comment on attachment 99773 patch Too invasive. 434772 10 dongseong.hwang 2011-07-11 05:26:22 -0700 I found that we did not need to handle Pattern, because Pattern is mutable only due to Pattern::setPatternSpaceTransform() and setPatternSpaceTransform() already updates platformPattern. I agree that this patch is too invasive. It is because SkGradientShader is immutable. We have to change platformGradient in GraphicsContext at every time that Gradient is modified. There is two approaches in order to change the platformGradient object. 1. Above approach. 2. Gradient has the callback for updating platformGradient in GraphicsContextSkia. The second approach will be similar that DrawingBufferChromium uses WillPublishCallback class for managing a PlatformContextSkia object. However, it will be more complex that a GradientSkia manages GraphicsContextSkia listners than a DrawingBufferChromium manages a PlatformContextSkia because several GraphicsContext objects can share one Gradient object and even one GraphicsContext can use one Gradient twice (i.e. fill and stroke). I think two approaches are too invasive. It is why I chose the first invasive approach. Recommend me better idea, please. 434902 11 reed 2011-07-11 08:48:34 -0700 proposed alternate fix: https://bugs.webkit.org/show_bug.cgi?id=64281 435073 12 reed 2011-07-11 11:53:26 -0700 https://bugs.webkit.org/show_bug.cgi?id=64281 This CL has landed. Can you confirm whether it fixes the issue for you? 435104 13 senorblanco 2011-07-11 12:13:04 -0700 (In reply to comment #12) > https://bugs.webkit.org/show_bug.cgi?id=64281 > > This CL has landed. Can you confirm whether it fixes the issue for you? FYI, 2d.gradient.object.update seems to be passing on the canaries: http://build.chromium.org/p/chromium.webkit/builders/Webkit%20Linux/builds/10413 I'll update the test expectations. 435372 14 dongseong.hwang 2011-07-11 18:20:52 -0700 OMG! https://bugs.webkit.org/show_bug.cgi?id=64281 solved it. I'm sorry for confusion. 435373 15 dongseong.hwang 2011-07-11 18:22:43 -0700 *** This bug has been marked as a duplicate of bug 64281 *** 99570 2011-07-03 02:52:03 -0700 2011-07-05 18:44:09 -0700 patch 0001-Chromium-Update-Gradient-and-Pattern-every-time-to-d.patch text/plain 12185 dongseong.hwang RnJvbSA4NGUwYzJkMDVmYTY3Mzc5MGMxMTNlNDg4MzM0OTczMTZkMGQ4MTQ0IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBIdWFuZyBEb25nc3VuZyA8bHV4dGVsbGFAY29tcGFueTEwMC5u ZXQ+CkRhdGU6IFN1biwgMyBKdWwgMjAxMSAxODoxNzozNiArMDkwMApTdWJqZWN0OiBbUEFUQ0hd IFtDaHJvbWl1bV0gVXBkYXRlIEdyYWRpZW50IGFuZCBQYXR0ZXJuIGV2ZXJ5IHRpbWUgdG8gZHJh dyBzaW1pbGFyIHRvCiBQbGF0Zm9ybUNvbnRleHQ6OnByZXBhcmVGb3JTb2Z0d2FyZURyYXcoKQog aHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTYzODcxCgpHcmFwaGljc0Nv bnRleHRTa2lhOjpzZXRbRmlsbHxTdHJva2VdW0dyYWRpZW50fFBhdHRlcm5dIGhhcyB0aGUgcHJv YmxlbSB0aGF0CkdyYXBoaWNzQ29udGV4dFNraWEgZG9lcyBub3QgYXBwbHkgZ3JhZGllbnQgb3Ig cGF0dGVybiBzdHlsZSBpZiB0aGUgZ3JhZGllbnQgb3IKcGF0dGVybiBpcyBjaGFuZ2VkIGFmdGVy 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