114338 2013-04-10 00:59:27 -0700 Nested opacity with overflow may display wrong results when composited 2022-07-06 11:25:14 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=241641 InRadar P2 Normal --- 1 noam fujii fujii simon.fraser thorton webkit-bug-importer oldest_to_newest 872640 0 noam 2013-04-10 00:59:27 -0700 New ref test added, compositing/overflow/overflow-scaled-descendant-overlapping.html, fails on Mac/WK2. 873042 1 simon.fraser 2013-04-10 11:25:07 -0700 compositing/overflow/overflow-scaled-descendant-overlapping.html doesn't have opacity. Did you mean something else? 873234 2 noam 2013-04-10 14:16:45 -0700 (In reply to comment #1) > compositing/overflow/overflow-scaled-descendant-overlapping.html doesn't have opacity. Did you mean something else? Right, I meant LayoutTests/compositing/overlap-blending/nested-overlap-overflow.html. 873263 3 simon.fraser 2013-04-10 15:15:24 -0700 Ugh, who writes testcases with body > div > div > div. So hard to grok. 873264 4 simon.fraser 2013-04-10 15:18:31 -0700 I think this is clipping of positioned objects inside overlfow being incorrect when they are composited. It's not related to opacity. 873549 5 noam 2013-04-10 22:07:20 -0700 (In reply to comment #4) > I think this is clipping of positioned objects inside overlfow being incorrect when they are composited. It's not related to opacity. At least for TextueMapper this only appeared when adding opacity, since this triggered a code path with intermediate surfaces (the equivalent of transparency layers in GraphicsContext). Not sure if this happens on CA without transparency layers. 1880906 6 fujii 2022-07-05 22:45:12 -0700 This test isn't valid. If an element has overflow:hidden and transform, it should clip positioned descendants. nested-overlap-overflow.html has transform, but nested-overlap-overflow-expected.html. Firefox, Chrome and Safari render same. If I added 'transform' to nested-overlap-overflow-expected.html, Firefox and Chrome clip the green box like nested-overlap-overflow.html. diff --git a/LayoutTests/compositing/overlap-blending/nested-overlap-overflow-expected.html b/LayoutTests/compositing/overlap-blending/nested-overlap-overflow-expected.html index aaae129798aa..3430fedddac8 100644 --- a/LayoutTests/compositing/overlap-blending/nested-overlap-overflow-expected.html +++ b/LayoutTests/compositing/overlap-blending/nested-overlap-overflow-expected.html @@ -17,6 +17,7 @@ body > div { height: 100px; overflow: hidden; + transform: translateX(0); } body > div > div { width: 200px; WebKit doesn't clip in that case. This is another bug tracked by bug#241641. 1880909 7 460707 fujii 2022-07-05 23:04:45 -0700 Created attachment 460707 Patch 1881010 8 ews-feeder 2022-07-06 11:24:46 -0700 Committed 252184@main (e429d8971cc7): <https://commits.webkit.org/252184@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 460707. 1881011 9 webkit-bug-importer 2022-07-06 11:25:14 -0700 <rdar://problem/96533950> 460707 2022-07-05 23:04:45 -0700 2022-07-06 11:24:47 -0700 Patch bug-114338-20220706150444.patch text/plain 6443 fujii RnJvbSA5ZTgyYWJmNDM0YTAwZGYxMmRhYjYxYmEwYWIyNTcxNDg3ODM0NzE3IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBGdWppaSBIaXJvbm9yaSA8SGlyb25vcmkuRnVqaWlAc29ueS5j b20+CkRhdGU6IFdlZCwgNiBKdWwgMjAyMiAxNDo1ODoxNSArMDkwMApTdWJqZWN0OiBbUEFUQ0hd IFJlbW92ZSBhbiBpbnZhbGlkIHRlc3QKIGNvbXBvc2l0aW5nL292ZXJsYXAtYmxlbmRpbmcvbmVz dGVkLW92ZXJsYXAtb3ZlcmZsb3cuaHRtbAogaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19i dWcuY2dpP2lkPTExNDMzOAoKUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCgpJZiBhbiBlbGVt ZW50IGlzIGFwcGxpZWQgb3ZlcmZsb3c6aGlkZGVuIGFuZCB0cmFuc2Zvcm0sIGl0IHNob3VsZCBj bGlwCnBvc2l0aW9uZWQgZGVzY2VuZGFudHMuIG5lc3RlZC1vdmVybGFwLW92ZXJmbG93Lmh0bWwg aGFzIHRyYW5zZm9ybSwKYnV0IG5lc3RlZC1vdmVybGFwLW92ZXJmbG93LWV4cGVjdGVkLmh0bWwu 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