RESOLVED FIXED 291431
[HDR] Implement reliable way to detect an image hasHDRContent() or not 
https://bugs.webkit.org/show_bug.cgi?id=291431
Summary [HDR] Implement reliable way to detect an image hasHDRContent() or not
Said Abou-Hallawa
Reported 2025-04-11 09:34:08 PDT
Relying on the headroom of the ImageSource does not seem to be reliable. Besides Gain mapped images are not decoded as HDR images from the beginning. Instead they are decoded as SDR images until decoding as HDR is requested. Detecting whether an image has a gain map data has to rely on the AuxiliaryData of "{FileContents}" dictionary of the ImageSource.
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Radar WebKit Bug Importer
Comment 1 2025-04-11 09:34:24 PDT
<rdar://problem/149071262>
Said Abou-Hallawa
Comment 2 2025-04-11 09:41:52 PDT
Pull request: https://github.com/WebKit/WebKit/pull/43958
Said Abou-Hallawa
Comment 3 2025-05-01 10:19:06 PDT
WebKit fails to detect that the images have HDR contents in https://www.wide-gamut.com/test/image-hdr. Bug 291765 was filed to track the gain map separately. Let's use this bug for detecting the HDR-ness of the non gain-map images.
EWS
Comment 4 2025-05-01 12:59:12 PDT
Committed 294390@main (f798905acff7): <https://commits.webkit.org/294390@main> Reviewed commits have been landed. Closing PR #43958 and removing active labels.
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