222124 2021-02-18 11:42:55 -0800 RenderLayer::calculateLayerBounds() is wrong with clipping 2021-02-25 11:43:44 -0800 1 1 1 Unclassified WebKit Compositing Safari Technology Preview Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=222092 https://bugs.webkit.org/show_bug.cgi?id=222132 InRadar P2 Normal --- 1 simon.fraser webkit-unassigned simon.fraser webkit-bug-importer oldest_to_newest 1730956 0 420859 simon.fraser 2021-02-18 11:42:55 -0800 Created attachment 420859 Test case The UseLocalClipRectIfPossible code path in RenderLayer::calculateLayerBounds() assumes that all descendants are affected by the clip, but that'd wrong; this layer might not be in the containing block ancestry of descendant layers. 1730959 1 simon.fraser 2021-02-18 11:52:35 -0800 I think it needs to call clipRectRelativeToAncestor() with the ancestorLayer all the way down, rather than resetting ancestorLayer at each level. 1733433 2 webkit-bug-importer 2021-02-25 11:43:44 -0800 <rdar://problem/74753726> 420859 2021-02-18 11:42:55 -0800 2021-02-18 11:42:55 -0800 Test case composited-bounds-clipping.html text/html 912 simon.fraser PCFET0NUWVBFIGh0bWw+Cgo8aHRtbD4KPGhlYWQ+CiAgICA8c3R5bGU+CiAgICAgICAgLnBhcmVu dCB7CiAgICAgICAgICAgIGhlaWdodDogMTAwcHg7CiAgICAgICAgICAgIHdpZHRoOiA1MDBweDsK ICAgICAgICAgICAgbWFyZ2luOiA1MHB4OwogICAgICAgICAgICBiYWNrZ3JvdW5kOiBzaWx2ZXI7 CiAgICAgICAgICAgIG92ZXJmbG93OiBoaWRkZW47CiAgICAgICAgICAgIG9wYWNpdHk6IDAuOTU7 CiAgICAgICAgfSAgICAgICAgCgogICAgICAgIC5jaGlsZCB7CiAgICAgICAgICAgIHBvc2l0aW9u OiBhYnNvbHV0ZTsKICAgICAgICAgICAgdG9wOiA1MHB4OwogICAgICAgICAgICBoZWlnaHQ6IDEw MHB4OwogICAgICAgICAgICB3aWR0aDogNDAwcHg7CiAgICAgICAgICAgIGJhY2tncm91bmQ6ICNm ZmVhNjE7CiAgICAgICAgICAgIGJveC1zaGFkb3c6IDAgMCA1MHB4IGJsYWNrOwogICAgICAgIH0K ICAgICAgICAKICAgICAgICAudW5kZXJsYXAgewogICAgICAgICAgICBwb3NpdGlvbjogYWJzb2x1 dGU7CiAgICAgICAgICAgIHRvcDogNDVweDsKICAgICAgICAgICAgbGVmdDogNDVweDsKICAgICAg ICAgICAgaGVpZ2h0OiAyMHB4OwogICAgICAgICAgICB3aWR0aDogMjBweDsKICAgICAgICAgICAg Ym9yZGVyOiAxcHggc29saWQgYmx1ZTsKICAgICAgICB9CiAgICAgICAgCiAgICAgICAgLmNvbXBv c2l0ZWQgewogICAgICAgICAgICB0cmFuc2Zvcm06IHRyYW5zbGF0ZVooMCk7CiAgICAgICAgfQog ICAgICAgIAogICAgPC9zdHlsZT4KPC9oZWFkPgo8Ym9keT4KICAgIDxkaXYgY2xhc3M9ImNvbXBv c2l0ZWQgdW5kZXJsYXAiPjwvZGl2PgogICAgPGRpdiBjbGFzcz0icGFyZW50Ij4KICAgICAgPGRp diBjbGFzcz0ic2hhcmVkIGNoaWxkIj48L2Rpdj4KICAgIDwvZGl2Pgo8L2JvZHk+CjwvaHRtbD4K