56237 2011-03-11 18:33:56 -0800 [chromium] backface visibility doesn't work correctly on perspective-projected layers 2011-03-16 16:06:46 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 vangelis vangelis jamesr kbr oldest_to_newest 366473 0 vangelis 2011-03-11 18:33:56 -0800 The math used to compute the direction of the Z axis doesn't produce the right answer for complex transforms (ones with perspective projection, non-uniform scaling, etc) To see the problem go to: http://www.webkit.org/blog-files/3d-transforms/morphing-cubes.html and uncheck "backfaces visible". You'll notice faces popping in and out. 366475 1 85563 vangelis 2011-03-11 18:41:13 -0800 Created attachment 85563 Patch 367415 2 85563 kbr 2011-03-14 18:26:41 -0700 Comment on attachment 85563 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=85563&action=review Looks good to me. One comment. > Source/WebCore/platform/graphics/chromium/LayerRendererChromium.cpp:815 > + FloatQuad mappedLayer = combinedDrawMatrix.mapQuad(FloatQuad(layerRect)); > + FloatSize horizontalDir = mappedLayer.p2() - mappedLayer.p1(); > + FloatSize verticalDir = mappedLayer.p4() - mappedLayer.p1(); > + FloatPoint3D xAxis(horizontalDir.width(), horizontalDir.height(), 0); > + FloatPoint3D yAxis(verticalDir.width(), verticalDir.height(), 0); > + FloatPoint3D zAxis = xAxis.cross(yAxis); It seems odd to do these operations in 2D. Intuitively I would transform the four points of the quad in 3D (probably without the perspective portion of the matrix) and then do the appropriate vector differences and cross products. However I gather that TransformationMatrix doesn't provide enough control to do this. As long as you've tested this math to your satisfaction I'm sure it's OK. 368609 3 vangelis 2011-03-16 16:06:46 -0700 Committed r81288: <http://trac.webkit.org/changeset/81288> 85563 2011-03-11 18:41:13 -0800 2011-03-14 18:26:41 -0700 Patch bug-56237-20110311184111.patch text/plain 11005 vangelis SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDgwOTE3KQorKysgU291cmNlL1dlYkNvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMTUgQEAKKzIwMTEtMDMtMTEgIFZhbmdlbGlz IEtva2tldmlzICA8dmFuZ2VsaXNAY2hyb21pdW0ub3JnPgorCisgICAgICAgIFJldmlld2VkIGJ5 IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFtjaHJvbWl1bV0gRml4aW5nIGJhY2tmYWNlIHZp c2liaWxpdHkgZm9yIHRyYW5zZm9ybWVkIGxheWVycy4KKyAgICAgICAgaHR0cHM6Ly9idWdzLndl YmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTU2MjM3CisKKyAgICAgICAgVGVzdDogcGxhdGZvcm0v Y2hyb21pdW0vY29tcG9zaXRpbmcvYmFja2ZhY2UtdmlzaWJpbGl0eS10cmFuc2Zvcm1lZC5odG1s 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