86870 2012-05-18 10:49:24 -0700 [chromium] add back-face visibility check for renderSurfaces 2012-05-18 15:28:00 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 84195 1 shawnsingh shawnsingh cc-bugs enne jamesr vangelis webkit.review.bot oldest_to_newest 627807 0 shawnsingh 2012-05-18 10:49:24 -0700 This patch is related to https://bugs.webkit.org/show_bug.cgi?id=84195, but it might be convenient if this lands first, to reduce conflicts just in case we want to merge it back to m20. I'm currently testing this patch, both by itself and in conjunction with https://bugs.webkit.org/show_bug.cgi?id=84195, and its passing all unit tests and layout tests everywhere. The bug was that when a parent has preserves3D, but the layer does not, then it creates a renderSurface, and we do not correctly check backface visibility in that case. This caused a few pages that use flip mechanisms to break 627894 1 142760 shawnsingh 2012-05-18 12:05:11 -0700 Created attachment 142760 Patch 627896 2 142760 shawnsingh 2012-05-18 12:06:19 -0700 Comment on attachment 142760 Patch forgot to update the other unit test, will submit new patch in a bit 627919 3 142760 vangelis 2012-05-18 12:23:32 -0700 Comment on attachment 142760 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=142760&action=review > Source/WebCore/platform/graphics/chromium/cc/CCLayerTreeHostCommon.cpp:386 > + if (layer->parent() && layer->parent()->preserves3D() && !layer->doubleSided() && combinedTransform.isBackFaceVisible()) Do we have to worry about combinedTransform's that are animated on the thread? It seems from: https://bugs.webkit.org/show_bug.cgi?id=82370 that we always need to have a RS on the main tree for layers that could get one on the impl side. 627990 4 142777 shawnsingh 2012-05-18 13:30:24 -0700 Created attachment 142777 added transformIsKnown check ah, thanks... that is what was going wrong. This patch now passes all unit tests, no obvious regression on layout tests. 628022 5 142777 enne 2012-05-18 13:43:22 -0700 Comment on attachment 142777 added transformIsKnown check View in context: https://bugs.webkit.org/attachment.cgi?id=142777&action=review > Source/WebCore/platform/graphics/chromium/cc/CCLayerTreeHostCommon.cpp:388 > + // If this surface flattens its entire subtree, then we need to check back-face visibility before continuing with this surface. > + // Cannot early exit here, however, if the transform is animating and not known on the main thread. > + if (layer->parent() && layer->parent()->preserves3D() && transformToParentIsKnown(layer) && !layer->doubleSided() && combinedTransform.isBackFaceVisible()) Don't you also need to check !layer->preserves3D() to know that this layer flattens its subtree? I think a "flattensSubtreeToSurface()" helper might improve readability too. 628043 6 shawnsingh 2012-05-18 14:01:07 -0700 (In reply to comment #5) > (From update of attachment 142777 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=142777&action=review > > > Source/WebCore/platform/graphics/chromium/cc/CCLayerTreeHostCommon.cpp:388 > > + // If this surface flattens its entire subtree, then we need to check back-face visibility before continuing with this surface. > > + // Cannot early exit here, however, if the transform is animating and not known on the main thread. > > + if (layer->parent() && layer->parent()->preserves3D() && transformToParentIsKnown(layer) && !layer->doubleSided() && combinedTransform.isBackFaceVisible()) > > Don't you also need to check !layer->preserves3D() to know that this layer flattens its subtree? I think a "flattensSubtreeToSurface()" helper might improve readability too. Actually the code is correct, its my comment that is misleading and wrong. The comment should say "if this surface is already in a w3c rendering context, then we should check whether the back face is visible" The full situation can be understood in the context of https://bugs.webkit.org/show_bug.cgi?id=84195. Different transforms need to be used to check back-face visibility, depending on whether we're in a 3d rendering context or not. I'll add the appropriate helper function and fix the comment. 628078 7 142784 shawnsingh 2012-05-18 14:30:41 -0700 Created attachment 142784 Fixed comment and added useful helper function Tested again manually, unit, layout, all seems good. 628123 8 142784 enne 2012-05-18 15:05:08 -0700 Comment on attachment 142784 Fixed comment and added useful helper function R=me. 628149 9 shawnsingh 2012-05-18 15:27:30 -0700 Committed r117645: <http://trac.webkit.org/changeset/117645> 628152 10 shawnsingh 2012-05-18 15:28:00 -0700 (In reply to comment #8) > (From update of attachment 142784 [details]) > R=me. Thanks! 142760 2012-05-18 12:05:11 -0700 2012-05-18 13:30:21 -0700 Patch bug-86870-20120518120510.patch text/plain 7160 shawnsingh U3VidmVyc2lvbiBSZXZpc2lvbjogMTE3NTE1CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMGUwMzQyNmRlZmQwZTQx ZTliY2RkOWE3ZGQ4OTc2YTBkNDVkNDE5YS4uZTQ4ZTAzYWYxNDZhMTljZGMxOTY1NzA4OTk1OWRl OWYxZmUyMzJhMyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE5IEBACisyMDEyLTA1LTE4ICBTaGF3 biBTaW5naCAgPHNoYXduc2luZ2hAY2hyb21pdW0ub3JnPgorCisgICAgICAgIFtjaHJvbWl1bV0g YWRkIGJhY2stZmFjZSB2aXNpYmlsaXR5IGNoZWNrIGZvciByZW5kZXJTdXJmYWNlcworICAgICAg ICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9ODY4NzAKKworICAgICAg ICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBUZXN0IGFkZGVkIENDTGF5 ZXJUcmVlSG9zdENvbW1vblRlc3Q6OnZlcmlmeUJhY2tGYWNlQ3VsbGluZ1dpdGhQcmVzZXJ2ZXMz ZEZvckZsYXR0ZW5pbmdTdXJmYWNlCisKKyAgICAgICAgQ2hyb21pdW0gd2FzIG5vdCBjaGVja2lu 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