[webkit-changes] [WebKit/WebKit] 115f02: [view-transitions] Implement "capture the image" a...

[mattwoodrow]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 115f0206bb9c8fc07b0f7d07d4e1001963b0557c
      https://github.com/WebKit/WebKit/commit/115f0206bb9c8fc07b0f7d07d4e1001963b0557c
  Author: Matt Woodrow <mattwoodrow at apple.com>
  Date:   2024-02-18 (Sun, 18 Feb 2024)

  Changed paths:
    M LayoutTests/platform/glib/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/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 and Simon Fraser.

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/274957@main



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