REGRESSION(293871@main): WeChat app allocates large sizes of memory for high resolution images on iOS 26

[shallawa]

c4dc356

REGRESSION(293871@main): WeChat app allocates large sizes of memory for high resolution images on iOS 26
https://bugs.webkit.org/show_bug.cgi?id=300903
rdar://162787553

Reviewed by Simon Fraser.

293871@main removes setting the value for the key kCGImageSourceSubsampleFactor
in the decoding options. This option is useful when decoding a high resolution
image which will be displayed on a much smaller rectangle. ImageIO decodes the
image with a smaller rectangle in this case. This saves memory and CPU time.

* Source/WebCore/platform/graphics/cg/ImageDecoderCG.cpp:
(WebCore::appendImageSourceOption):
(WebCore::imageSourceMetadataOptions):
(WebCore::imageSourceOptions):
(WebCore::imageSourceThumbnailOptions):
(WebCore::ImageDecoderCG::hasHDRGainMap const):
(WebCore::ImageDecoderCG::frameDensityCorrectedSizeAtIndex const):
(WebCore::ImageDecoderCG::fetchFrameMetaDataAtIndex const):
(WebCore::createImageSourceMetadataOptions): Deleted.
(WebCore::appendImageSourceOptions): Deleted.

Canonical link: https://commits.webkit.org/301729@main

d8a7182

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	✅ 🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 win-tests	✅ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	❌ 🧪 api-wpe		✅ 🛠 vision-apple
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 47439dd)

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	❌ 🛠 ios	❌ 🛠 mac	✅ 🛠 wpe	⏳ 🛠 win	⏳ 🛠 ios-apple
✅ 🧪 bindings	❌ 🛠 ios-sim	❌ 🛠 mac-AS-debug	🧪 wpe-wk2	⏳ 🧪 win-tests	⏳ 🛠 mac-apple
✅ 🧪 webkitperl	❌ 🧪 ios-wk2	❌ 🧪 api-mac	🧪 api-wpe		⏳ 🛠 vision-apple
	❌ 🧪 ios-wk2-wpt	❌ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	❌ 🧪 api-ios	❌ 🧪 mac-wk2	✅ 🛠 gtk
	❌ 🛠 vision	❌ 🧪 mac-AS-debug-wk2	🧪 gtk-wk2
	❌ 🛠 vision-sim	❌ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	⏳ 🧪 vision-wk2	❌ 🧪 mac-intel-wk2	✅ 🛠 playstation
	❌ 🛠 tv	❌ 🛠 mac-safer-cpp
	❌ 🛠 tv-sim
	❌ 🛠 watch
	❌ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash d8a7182)

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	✅ 🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 win-tests	✅ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	❌ 🧪 api-wpe		✅ 🛠 vision-apple
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[shallawa]

I wrote a test case for this PR but it requires adding a gigantic image. The size of this image is 11 MB. I am not sure whether it is okay to submit such a big file or not. I will address adding a layout test in a separate patch.

[webkit-commit-queue]

Committed 301729@main (c4dc356): https://commits.webkit.org/301729@main

Reviewed commits have been landed. Closing PR #52489 and removing active labels.