Bug 295729

Summary: copyExternalImageToTexture swizzles texture incorrectly
Product: WebKit Reporter: castano
Component: WebGPUAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: mwyrzykowski, tzagallo, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari 18   
Hardware: Mac (Apple Silicon)   
OS: Unspecified   
Attachments:
Description Flags
problematic texture
none
Safari left, Chrome right none

castano
Reported 2025-07-10 11:49:47 PDT
Created attachment 475865 [details] problematic texture The attached "Ground037_1K-PNG_Color.png" texture is not swizzled correctly and shows a blue tint when loaded through `copyExternalImageToTexture`. However, when loading the texture manually and updating it with `writeTexture` the results are correct. See the attached screenshot. You can see the problem in the following website: https://ludicon.com/sparkjs/ Select or upload the attached image, and press original to see the version of the texture created with `copyExternalImageToTexture`. This issue only occurs in WebKit. Chrome and Firefox produce the expected results.
Attachments
problematic texture (2.50 MB, image/png)
2025-07-10 11:49 PDT, castano 		no flags
Details
Safari left, Chrome right (4.10 MB, image/heic)
2025-07-10 13:20 PDT, Mike Wyrzykowski 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2025-07-10 13:15:10 PDT
<rdar://problem/155552869>
Mike Wyrzykowski
Comment 2 2025-07-10 13:20:13 PDT
Created attachment 475867 [details] Safari left, Chrome right Does this reproduce on Safari Technology Preview 223? I see the attached image in latest Safari compared to Chrome canary Version 140.0.7287.0 (Official Build) canary (arm64) It looks the same but maybe I'm missing a repro step?
castano
Comment 3 2025-07-11 00:33:13 PDT
Apologies, I should have stated the Safari version I was testing: "Version 18.5 (20621.2.5.11.8)". I just tried with the Technology Preview 223 and I'm not able to reproduce the issue anymore.
castano
Comment 4 2025-07-11 00:34:05 PDT
Actually, looks like I mistakenly reported the issue on the wrong version. Sorry!
Mike Wyrzykowski
Comment 5 2025-07-11 08:18:20 PDT
No problem, glad it is fixed :)
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