[webkit-changes] [WebKit/WebKit] 93bef5: Combining backface-visibility:hidden and backdrop-...

[mattwoodrow]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 93bef5855560f6abc5817869e36e81473204974f
      https://github.com/WebKit/WebKit/commit/93bef5855560f6abc5817869e36e81473204974f
  Author: Matt Woodrow <mattwoodrow at apple.com>
  Date:   2023-09-25 (Mon, 25 Sep 2023)

  Changed paths:
    A LayoutTests/css3/filters/backdrop/backdrop-filter-with-backface-visibility-expected.html
    A LayoutTests/css3/filters/backdrop/backdrop-filter-with-backface-visibility.html
    M Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp

  Log Message:
  -----------
  Combining backface-visibility:hidden and backdrop-filter stops the backface from being hidden.
https://bugs.webkit.org/show_bug.cgi?id=249952
<rdar://103940530>

Reviewed by Simon Fraser.

Structural layers created for backdrop-filter should still have the double sided property set.

* LayoutTests/css3/filters/backdrop/backdrop-filter-with-backface-visibility-expected.html: Added.
* LayoutTests/css3/filters/backdrop/backdrop-filter-with-backface-visibility.html: Added.
* Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp:
(WebCore::GraphicsLayerCA::updateBackfaceVisibility):

Canonical link: https://commits.webkit.org/268427@main