Bug 281079

Summary: [TextureMapper] Preserve-3d layers don't get flattened correctly
Product: WebKit Reporter: Jani Hautakangas <jani>
Component: WPE WebKitAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: bugs-noreply, fujii.hironori, llepage, mcatanzaro, webkit-bug-importer
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=241699
Bug Depends on: 281899    
Bug Blocks:    
Attachments:
Description Flags
test case
none
[Screenshot] Firefox: Layers rendered correcty
none
[Screenshot] WPEWebkit: 2.46.0 incorrect rendering
none
flattening-layer-backdrops
none
flattening-layer-drop-shadow none

Jani Hautakangas
Reported 2024-10-08 12:09:05 PDT
Created attachment 472863 [details] test case In the 3D rendering context, TextureMapper does not flatten layers correctly to a plane. Expected Behavior (as per CSS spec): "The element establishing the 3D rendering context, along with other 3D transformed elements participating in the context, should be rendered into its own plane. This plane includes the element’s backgrounds, borders, box decorations, content, and descendant elements—excluding descendants that have their own planes." Actual Behavior: TextureMapper incorrectly resets transformations to root layer 2D plane for leaf layers in the 3D rendering context, rather than properly accumulating 3D transforms for each layer.
Attachments
test case (1.63 KB, text/html)
2024-10-08 12:09 PDT, Jani Hautakangas 		no flags
Details
[Screenshot] Firefox: Layers rendered correcty (3.42 KB, image/png)
2024-10-08 12:09 PDT, Jani Hautakangas 		no flags
Details
[Screenshot] WPEWebkit: 2.46.0 incorrect rendering (6.45 KB, image/png)
2024-10-08 12:10 PDT, Jani Hautakangas 		no flags
Details
flattening-layer-backdrops (2.22 KB, text/html)
2024-10-27 05:52 PDT, Jani Hautakangas 		no flags
Details
flattening-layer-drop-shadow (1.66 KB, text/html)
2024-10-27 13:52 PDT, Jani Hautakangas 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Jani Hautakangas
Comment 1 2024-10-08 12:09:57 PDT
Created attachment 472864 [details] [Screenshot] Firefox: Layers rendered correcty
Jani Hautakangas
Comment 2 2024-10-08 12:10:49 PDT
Created attachment 472865 [details] [Screenshot] WPEWebkit: 2.46.0 incorrect rendering
Fujii Hironori
Comment 3 2024-10-08 13:02:32 PDT
TextureMapper doesn't support nesting 3D rendering context yet (bug#241699).
Jani Hautakangas
Comment 4 2024-10-08 13:57:50 PDT
Pull request: https://github.com/WebKit/WebKit/pull/34862
Jani Hautakangas
Comment 5 2024-10-27 05:52:31 PDT
Created attachment 473058 [details] flattening-layer-backdrops
Jani Hautakangas
Comment 6 2024-10-27 13:52:59 PDT
Created attachment 473059 [details] flattening-layer-drop-shadow
EWS
Comment 7 2024-10-29 01:14:21 PDT
Committed 285820@main (7f89d2259aab): <https://commits.webkit.org/285820@main> Reviewed commits have been landed. Closing PR #34862 and removing active labels.
Fujii Hironori
Comment 8 2024-10-29 03:04:42 PDT
*** Bug 241699 has been marked as a duplicate of this bug. ***
Michael Catanzaro
Comment 9 2024-10-29 07:13:54 PDT
*** Bug 241016 has been marked as a duplicate of this bug. ***
Pawel Lampe
Comment 10 2025-10-13 05:48:57 PDT
*** Bug 249583 has been marked as a duplicate of this bug. ***
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