[webkit-changes] [WebKit/WebKit] 136017: [view-transitions] Implement "capture the image" a...

[mattwoodrow]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 1360173f7d2bb98f8b6d3eefa30d77620bd07c37
      https://github.com/WebKit/WebKit/commit/1360173f7d2bb98f8b6d3eefa30d77620bd07c37
  Author: Matt Woodrow <mattwoodrow at apple.com>
  Date:   2024-02-21 (Wed, 21 Feb 2024)

  Changed paths:
    M LayoutTests/platform/glib/TestExpectations
    M LayoutTests/platform/mac-wk2/TestExpectations
    M Source/WebCore/dom/ViewTransition.cpp
    M Source/WebCore/dom/ViewTransition.h
    M Source/WebCore/rendering/RenderBoxModelObject.cpp
    M Source/WebCore/rendering/RenderElement.cpp
    M Source/WebCore/rendering/RenderElement.h
    M Source/WebCore/rendering/RenderLayer.cpp
    M Source/WebCore/rendering/RenderLayer.h
    M Source/WebCore/rendering/RenderLayerBacking.cpp
    M Source/WebCore/rendering/RenderLayerCompositor.cpp
    M Source/WebCore/rendering/RenderLayerCompositor.h
    M Source/WebCore/rendering/RenderViewTransitionCapture.cpp
    M Source/WebCore/rendering/RenderViewTransitionCapture.h
    M Source/WebCore/rendering/updating/RenderTreeUpdaterViewTransition.cpp

  Log Message:
  -----------
  [view-transitions] Implement "capture the image" algorithm.
https://bugs.webkit.org/show_bug.cgi?id=265170
<rdar://118667021>

Reviewed by Tim Nguyen.

Uses 'snapshotNode' to capture the old image during 'captureOldState', and
implements `paintReplaced` on the renderer (in the same way RenderHTMLElement
does) to draw the old catpured image.

Forces composited layers to be created for the ::view-transition-new/old pseudos,
as well as the element with the view-transtion, and reparents the GraphicsLayer
from real element into pseduo, so that the new capture is displayed using the
live content. This also effectively stops the original element from being displayed
normally, as required by the spec.

* Source/WebCore/dom/ViewTransition.cpp:
(WebCore::ViewTransition::captureOldState):
* Source/WebCore/dom/ViewTransition.h:
* Source/WebCore/rendering/RenderBoxModelObject.cpp:
(WebCore::RenderBoxModelObject::requiresLayer const):
* Source/WebCore/rendering/RenderElement.cpp:
(WebCore::RenderElement::hasViewTransition const):
(WebCore::RenderElement::isViewTransitionPseudo const):
* Source/WebCore/rendering/RenderElement.h:
* Source/WebCore/rendering/RenderLayer.cpp:
(WebCore::canCreateStackingContext):
(WebCore::RenderLayer::shouldBeCSSStackingContext const):
(WebCore::RenderLayer::computeCanBeBackdropRoot const):
* Source/WebCore/rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::updateGeometry):
* Source/WebCore/rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::collectViewTransitionNewContentLayers):
(WebCore::RenderLayerCompositor::updateBackingAndHierarchy):
(WebCore::RenderLayerCompositor::requiresCompositingLayer const):
(WebCore::RenderLayerCompositor::requiresOwnBackingStore const):
(WebCore::RenderLayerCompositor::requiresCompositingForViewTransition const):
* Source/WebCore/rendering/RenderLayerCompositor.h:
* Source/WebCore/rendering/RenderViewTransitionCapture.cpp:
(WebCore::RenderViewTransitionCapture::setImage):
(WebCore::RenderViewTransition::paintReplaced):
* Source/WebCore/rendering/RenderViewTransitionCapture.h:
* Source/WebCore/rendering/updating/RenderTreeUpdaterViewTransition.cpp:
(WebCore::RenderTreeUpdater::ViewTransition::updatePseudoElementTree):
(WebCore::RenderTreeUpdater::ViewTransition::buildPseudoElementGroup):
(WebCore::RenderTreeUpdater::ViewTransition::updatePseudoElementGroup):

Canonical link: https://commits.webkit.org/275087@main



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