198018 2019-05-18 16:11:37 -0700 Keep using shared backing when overlap testing makes it possible 2019-05-18 16:11:42 -0700 1 1 1 Unclassified WebKit Compositing WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 1 simon.fraser simon.fraser simon.fraser oldest_to_newest 1537431 0 370201 simon.fraser 2019-05-18 16:11:37 -0700 Created attachment 370201 Testcase In the test case, a single composited layer kicks later siblings out of backing sharing, but they should be able to share because they don't overlap the composited layer. 370201 2019-05-18 16:11:37 -0700 2019-05-18 16:11:37 -0700 Testcase multiple-sharing-layers.html text/html 1060 simon.fraser PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KICAgIDxzdHlsZT4KICAgICAgICAuY2xpcHBp bmcgewogICAgICAgICAgICBwb3NpdGlvbjogYWJzb2x1dGU7CiAgICAgICAgICAgIHRvcDogMjBw eDsKICAgICAgICAgICAgbGVmdDogMjBweDsKICAgICAgICAgICAgb3ZlcmZsb3c6IGhpZGRlbjsK ICAgICAgICAgICAgaGVpZ2h0OiA1MDBweDsKICAgICAgICAgICAgd2lkdGg6IDMwMHB4OwogICAg ICAgICAgICBtYXJnaW46IDEwcHg7CiAgICAgICAgICAgIGJvcmRlcjogMXB4IHNvbGlkIGJsYWNr OwogICAgICAgIH0KICAgICAgICAKICAgICAgICAuc2hhcmluZyB7CgkJCXBvc2l0aW9uOiByZWxh dGl2ZTsKICAgICAgICAgICAgbWFyZ2luOiAxMHB4OwogICAgICAgICAgICB3aWR0aDogMTEwcHg7 CiAgICAgICAgICAgIGhlaWdodDogMTEwcHg7CiAgICAgICAgICAgIGJhY2tncm91bmQtY29sb3I6 IGdyZWVuOwogICAgICAgIH0KICAgICAgICAKICAgICAgICAuY29tcG9zaXRlZCB7CiAgICAgICAg ICAgIHRyYW5zZm9ybTogdHJhbnNsYXRlWigwKTsKICAgICAgICB9CiAgICAgICAgCgogICAgICAg IC50cmlnZ2VyIHsKICAgICAgICAgICAgdHJhbnNmb3JtOiB0cmFuc2xhdGVaKDApOwogICAgICAg ICAgICB3aWR0aDogNTBweDsKICAgICAgICAgICAgaGVpZ2h0OiA1MHB4OwogICAgICAgICAgICBi YWNrZ3JvdW5kLWNvbG9yOiBzaWx2ZXI7CiAgICAgICAgfQogICAgICAgIAogICAgPC9zdHlsZT4K PC9oZWFkPgo8Ym9keT4KICAgIDxkaXYgY2xhc3M9ImNvbXBvc2l0ZWQgdHJpZ2dlciI+PC9kaXY+ CiAgICA8ZGl2IGNsYXNzPSJjbGlwcGluZyI+CiAgICAgICAgPGRpdiBjbGFzcz0ic2hhcmluZyBi b3giPgogICAgICAgIDwvZGl2PgogICAgICAgIDxkaXYgY2xhc3M9InNoYXJpbmcgY29tcG9zaXRl ZCBib3giPgogICAgICAgIDwvZGl2PgogICAgICAgIDxkaXYgY2xhc3M9InNoYXJpbmcgYm94Ij4K ICAgICAgICA8L2Rpdj4KICAgICAgICA8ZGl2IGNsYXNzPSJzaGFyaW5nIGJveCI+CiAgICAgICAg PC9kaXY+CiAgICA8L2Rpdj4KPC9ib2R5Pgo8L2h0bWw+Cg==