Bug 301592

Summary: [HDR] CoreGraphics filters do not support float16 unaccelerated backing stores
Product: WebKit Reporter: Said Abou-Hallawa <sabouhallawa>
Component: ImagesAssignee: Said Abou-Hallawa <sabouhallawa>
Status: RESOLVED FIXED    
Severity: Normal CC: sabouhallawa, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=301708
Attachments:
Description Flags
HDR image
none
test case none

Said Abou-Hallawa
Reported 2025-10-28 14:12:57 PDT
1. Launch mini-browser on macOS 2. Disable accelerated drawing by unchecking "Setting/ Enable Accelerated Drawing". 3. Open the attached test case. Result: CoreGraphics fires an assertion because a blur filter is applied on a float16 unaccelerated backing store. The fix is to disable CoreGraphics filters for float16 unaccelerated backing stores and use software filters for now. Software filters do not support float16 backing stores, But copying the sourceImage to 8-bit backing store converts the HDR display to SDR. Therefore the filter works but on SDR backing store.
Attachments
HDR image (157.18 KB, image/jpeg)
2025-10-28 14:14 PDT, Said Abou-Hallawa 		no flags
Details
test case (156 bytes, text/html)
2025-10-28 14:16 PDT, Said Abou-Hallawa 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Said Abou-Hallawa
Comment 1 2025-10-28 14:13:29 PDT
rdar://163220052
Said Abou-Hallawa
Comment 2 2025-10-28 14:14:39 PDT
Created attachment 477214 [details] HDR image
Said Abou-Hallawa
Comment 3 2025-10-28 14:16:08 PDT
Created attachment 477215 [details] test case
Said Abou-Hallawa
Comment 4 2025-10-28 14:20:10 PDT
Pull request: https://github.com/WebKit/WebKit/pull/53099
EWS
Comment 5 2025-10-29 13:02:10 PDT
Committed 302306@main (9f930ab5c13c): <https://commits.webkit.org/302306@main> Reviewed commits have been landed. Closing PR #53099 and removing active labels.
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