Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 97774366800c5b796bc2144ebd55d152d074ed57
https://github.com/WebKit/WebKit/commit/97774366800c5b796bc2144ebd55d152d074ed57
Author: Alan Baradlay <[email protected]>
Date: 2022-12-08 (Thu, 08 Dec 2022)
Changed paths:
M Source/WebCore/layout/formattingContexts/inline/text/TextUtil.cpp
Log Message:
-----------
[LFC][IFC] Introduce a fast path for finding breaking position when text
content uses fixed pitch font
https://bugs.webkit.org/show_bug.cgi?id=248015
<rdar://problem/102637833>
Reviewed by Simon Fraser.
While sometimes fixed pitch fonts (e.g. Monospace) lie about them being fixed
pitch
(i.e. not all of their glyphs have the same advance width -see
webkit.org/b/221581)
let's just assume they are uniform and
1. estimate the breaking position based on the assumed character width
2. confirm it by calling FontCascade::width()
In the common case (when the font is truly fixed), the estimated breaking
position matches the actual breaking position,
while in the rare cases, we fall back to the regular, bisect algorithm.
This produces ~3x better line breaking perf on
PerformanceTests/Layout/fixed-pitch-arbitrary-break-long-text.html
microbenchmark.
* Source/WebCore/layout/formattingContexts/inline/text/TextUtil.cpp:
(WebCore::Layout::TextUtil::breakWord):
Canonical link: https://commits.webkit.org/257585@main
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