Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b289d5f2461d7da84861df406cee682afa4c39df
https://github.com/WebKit/WebKit/commit/b289d5f2461d7da84861df406cee682afa4c39df
Author: Simon Fraser <simon.fra...@apple.com>
Date: 2024-03-21 (Thu, 21 Mar 2024)
Changed paths:
M Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
M Source/WebKit/UIProcess/Cocoa/WebPageProxyCocoa.mm
M Source/WebKit/UIProcess/WebPageProxy.cpp
M Source/WebKit/UIProcess/WebPageProxy.h
Log Message:
-----------
REGRESSION (UI-side compositing?): Sporadic failures in layout tests due to
wrong test images
https://bugs.webkit.org/show_bug.cgi?id=271348
rdar://120050275
Reviewed by Tim Horton.
When we take snapshots of layout tests, we wait for a
`callAfterNextPresentationUpdate()`, which
waits for a transaction to come from the web process. However, it doesn't wait
for the subsequent
Core Animation commit, which actually pushes changes to WindowServer. Yet the
snapshot we do is
a WindowServer snapshot (`PlatformWebView::windowSnapshotImage()`), so we can
sometimes capture state that is stale.
We don't actually know when our new content gets to WindowServer and will show
up in a snapshot,
but we can reduce the raciness by at least waiting for the Core Animation
commit to complete.
So add `callAfterNextPresentationUpdateAndLayerCommit()` and use it
`WebPageProxy::forceRepaint()`.
Also update `-[WKWebView takeSnapshotWithConfiguration:]` to use it.
* Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:
(-[WKWebView takeSnapshotWithConfiguration:completionHandler:]):
* Source/WebKit/UIProcess/Cocoa/WebPageProxyCocoa.mm:
(WebKit::WebPageProxy::callAfterNextPresentationUpdateAndLayerCommit):
* Source/WebKit/UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::forceRepaint):
(WebKit::WebPageProxy::callAfterNextPresentationUpdateAndLayerCommit):
* Source/WebKit/UIProcess/WebPageProxy.h:
Canonical link: https://commits.webkit.org/276494@main
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