Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 2be15327b03e563648a8839505a6f4ff6b976607
https://github.com/WebKit/WebKit/commit/2be15327b03e563648a8839505a6f4ff6b976607
Author: Simon Fraser <[email protected]>
Date: 2025-10-21 (Tue, 21 Oct 2025)
Changed paths:
M Source/WebCore/dom/Document.cpp
M Source/WebCore/dom/Document.h
M Source/WebCore/page/LargestContentfulPaintData.cpp
M Source/WebCore/page/LargestContentfulPaintData.h
M Source/WebCore/rendering/TextBoxPainter.cpp
Log Message:
-----------
[LCP] Optimize LCP for text paints when we know there's only one text box per
element
https://bugs.webkit.org/show_bug.cgi?id=301135
rdar://163067611
Reviewed by Alan Baradlay.
When we know there's only one text box associated with an element, we can do an
early
check of the painted rect area with the current largest area (when there are no
transforms in
the ancestor chain). When there's more than one text, we have to take the
union, and won't
know the result until painting is complete.
We can check for a single box by counting the number of lines, and boxes; there
are 2 boxes,
the root inline box, and the single child box.
Tested by WPT.
* Source/WebCore/dom/Document.cpp:
(WebCore::Document::didPaintText const):
* Source/WebCore/dom/Document.h:
* Source/WebCore/page/LargestContentfulPaintData.cpp:
(WebCore::LargestContentfulPaintData::didPaintText):
* Source/WebCore/page/LargestContentfulPaintData.h:
* Source/WebCore/rendering/TextBoxPainter.cpp:
(WebCore::TextBoxPainter::paint):
Canonical link: https://commits.webkit.org/301895@main
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