190245 2018-10-03 03:38:27 -0700 [WPE] Text incorrectly rendered when using SimpleLineLayout 2018-11-16 01:47:22 -0800 1 1 1 Unclassified WebKit WPE WebKit WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 90342 1 magomez magomez bugs-noreply koivisto mcatanzaro simon.fraser zalan oldest_to_newest 1465998 0 351505 magomez 2018-10-03 03:38:27 -0700 Created attachment 351505 Testcase I'm attaching a simple testcase to reproduce this problem. In the test, we have a div with its own GraphicsLayer, and inside that div there's a text element. Then the text is changed at the same time than the style of the layer is changed. This should cause that both the div and the text were repainted but that's not happening (unless we're always using complex text). What happens is: - RenderText::setText is called because of the changed text, and it invalidates its simpleLineLayout - RenderLayerCompositor::layerStyleChanged is called because of the div style change. This calls RenderLayerBacking::updateAfterDescendants which calls RenderLayerBacking::updateDrawsContent. This one traverses the children to check whether its children are visible. As the child RenderText can't provide a simpleLineLayout (it won't be recreated until the layout happens), the boundingBox gotten for the text is empty, so RenderLayerBacking thinks that it doesn't have anything to paint and call GraphicsLayer::setDrawsContent with false. - The layout happens, and it requests a display of the layer contents through RenderLayerBacking::setContentsNeedDisplay, but as the associated GraphicsLayer has drawsContent to false, it's discarded - then the layout properly calculates the size for the new text and sets the GraphicsLayer drawsContent to true, but it's too late cause there isn't any new call to RenderLayerBacking::setContentsNeedDisplay - in the end, the GraphicsLayer is not repainted because it wasn't set a dirty rectangle to repaint. 1466031 1 351513 magomez 2018-10-03 05:26:34 -0700 Created attachment 351513 Patch 1466050 2 mcatanzaro 2018-10-03 07:18:14 -0700 We are always using complex text. The simple text codepath is all dead code for our ports. How are you getting simple text? 1466053 3 magomez 2018-10-03 07:23:57 -0700 (In reply to Michael Catanzaro from comment #2) > We are always using complex text. The simple text codepath is all dead code > for our ports. How are you getting simple text? We are forcing complex text for wkgtk but not for wpe. 1467365 4 351871 magomez 2018-10-09 02:03:15 -0700 Created attachment 351871 Patch 1467366 5 magomez 2018-10-09 02:06:48 -0700 Antti, could you please give a look to this? Thanks in advance!! 1469674 6 koivisto 2018-10-16 01:21:45 -0700 Zalan should take a look 1469690 7 351871 zalan 2018-10-16 07:40:03 -0700 Comment on attachment 351871 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=351871&action=review > Source/WebCore/rendering/RenderLayer.cpp:-6098 > - if (renderText.linesBoundingBox().isEmpty()) > - continue; The bounding box value is totally invalid here and we should not make any painting decision based on that. We end up using the value from the previous layout which could be very different from what we might get as the result of the style/content change. This function should either not be called when the tree is dirty (Simon?) or skip geometry checks on dirty renderers completely. 1469691 8 zalan 2018-10-16 07:43:41 -0700 (In reply to Michael Catanzaro from comment #2) > We are always using complex text. The simple text codepath is all dead code > for our ports. How are you getting simple text? Simple line layout != simple text. Simple line layout is about whether the inline content can be laid out in a simple way without generating line boxes (RootInlineBox, InlineTextBox etc) 1469889 9 simon.fraser 2018-10-16 14:23:15 -0700 I think the patch in bug 90342 will fix this. 1479315 10 magomez 2018-11-16 01:47:22 -0800 (In reply to Simon Fraser (smfr) from comment #9) > I think the patch in bug 90342 will fix this. Yes, this became fixed with that patch, so closing bug. 351505 2018-10-03 03:38:27 -0700 2018-10-03 03:38:48 -0700 Testcase index.html text/html 632 magomez PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KPHN0eWxlIHR5cGU9InRleHQvY3NzIj4KLnRy YW5zZm9ybWVkIHsKICBwb3NpdGlvbjogYWJzb2x1dGU7CiAgd2lkdGg6IDIwMHB4OwogIGhlaWdo dDogNDBweDsKICBiYWNrZ3JvdW5kLWNvbG9yOiBjeWFuOwogIHRyYW5zZm9ybTogdHJhbnNsYXRl M2QoMHB4LCAwcHgsIDBweCk7Cn0KCi50cmFuc2Zvcm1lZDIgewogIHBvc2l0aW9uOiBhYnNvbHV0 ZTsKICB3aWR0aDogMjAwcHg7CiAgaGVpZ2h0OiA0MHB4OwogIGJhY2tncm91bmQtY29sb3I6IGN5 YW47CiAgdHJhbnNmb3JtOiB0cmFuc2xhdGUzZCgyMHB4LCAwcHgsIDBweCk7Cn0KCjwvc3R5bGU+ CjwvaGVhZD4KPGJvZHkgPgogIDxkaXYgaWQ9InR3byIgY2xhc3M9InRyYW5zZm9ybWVkIj5vcmln aW5hbDwvZGl2PgoKICA8c2NyaXB0IHR5cGU9InRleHQvamF2YXNjcmlwdCI+CiAgICBzZXRUaW1l b3V0KGZ1bmN0aW9uKCkgewogICAgdmFyIGRpdjIgPSBkb2N1bWVudC5nZXRFbGVtZW50QnlJZCgi dHdvIik7CiAgICBkaXYyLmNsYXNzTmFtZSA9ICJ0cmFuc2Zvcm1lZDIiOwogICAgZGl2Mi5pbm5l 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