[Filters] Enable CoreGraphics drop shadow filter

[shallawa]

318e176

[Filters] Enable CoreGraphics drop shadow filter
https://bugs.webkit.org/show_bug.cgi?id=261925
rdar://98820279

Reviewed by Cameron McCormack.

Software filters use ImageBuffers to generate the result of their applying to the
target element. These buffers can take significant amount of memory if the target
element is large or the number of effects are big.

CoreGraphics provides a better way to apply FilterEffects. A CGStyle can be used
to apply the FilterEffect to the current drawing. Also beginTransparencyLayer()/ endTransparencyLayer() can be used to force applying the FilterEffect only when
composting the layer to the destination GraphicsContext. This will treat the
drawing commands between beginning and ending the transparency layer as a unit
of drawing.

Although ColorMatrix and GussianBlur CGStyles are available on macOS Sonoma and
iOS 17, only DropShadow style will be enabled by this patch. The other styles
will be enabled in future patches after fixing the expected fuzziness.

* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:
* Source/WebCore/platform/graphics/filters/FEColorMatrix.cpp:
(WebCore::FEColorMatrix::supportedFilterRenderingModes const):
* Source/WebCore/platform/graphics/filters/FEGaussianBlur.cpp:
(WebCore::FEGaussianBlur::supportedFilterRenderingModes const):

Canonical link: https://commits.webkit.org/268354@main

ef12d81

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 tv	🧪 mac-AS-debug-wk2	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		⏳ 🧪 jsc-armv7-tests
✅ 🛠 🧪 merge	✅ 🛠 watch		✅ 🛠 jsc-mips
	✅ 🛠 watch-sim		✅ 🧪 jsc-mips-tests

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 1cd886e)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		⏳ 🧪 jsc-armv7-tests
	✅ 🛠 watch		✅ 🛠 jsc-mips
	✅ 🛠 watch-sim		✅ 🧪 jsc-mips-tests

[heycam]

Can you add a comment in here (and in FEGaussianBlur.cpp) to explain why we're doing 0 &&. Without any context it looks odd.

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 736ade9)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	🧪 api-mac	✅ 🛠 gtk
	🧪 ios-wk2-wpt	🧪 mac-wk1	🧪 gtk-wk2
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	🧪 mac-wk2	🧪 api-gtk
✅ 🛠 🧪 jsc-arm64	⏳ 🛠 tv	🧪 mac-AS-debug-wk2	✅ 🛠 jsc-armv7
	⏳ 🛠 tv-sim	🧪 mac-wk2-stress	⏳ 🧪 jsc-armv7-tests
🛠 🧪 merge	⏳ 🛠 watch		✅ 🛠 jsc-mips
	⏳ 🛠 watch-sim		✅ 🧪 jsc-mips-tests

[webkit-early-warning-system]

EWS run on current version of this PR (hash ef12d81)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 tv	🧪 mac-AS-debug-wk2	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		⏳ 🧪 jsc-armv7-tests
✅ 🛠 🧪 merge	✅ 🛠 watch		✅ 🛠 jsc-mips
	✅ 🛠 watch-sim		✅ 🧪 jsc-mips-tests

[webkit-commit-queue]

Committed 268354@main (318e176): https://commits.webkit.org/268354@main

Reviewed commits have been landed. Closing PR #18110 and removing active labels.