tree 00f596bdc5960c590b20f7572b9ed5c6d8d2f480
parent 2d9a491f00bf0bc531f58ccc075ddcdf1f027d19
author zalan@apple.com <zalan@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1579308152 +0000
committer zalan@apple.com <zalan@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1579308152 +0000

[LFC][IFC] Do not construct a dedicated run for the trailing (fully) collapsed whitespace.
https://bugs.webkit.org/show_bug.cgi?id=206428
<rdar://problem/58687058>

Reviewed by Antti Koivisto.

This patch reduces the final run count on a line from 2 to 1 in the common cases where the line ends in a collapsed trailing whitespace.
~3% progression on PerformanceTests/Layout/line-layout-simple.html.

* layout/inlineformatting/InlineFormattingContextQuirks.cpp:
(WebCore::Layout::InlineFormattingContext::Quirks::lineDescentNeedsCollapsing const):
* layout/inlineformatting/InlineLineBuilder.cpp:
(WebCore::Layout::LineBuilder::ContinuousContent::isEligible const):
(WebCore::Layout::LineBuilder::ContinuousContent::expand):
(WebCore::Layout::LineBuilder::close):
(WebCore::Layout::LineBuilder::alignContentVertically):
(WebCore::Layout::LineBuilder::runContentHeight const):
(WebCore::Layout::LineBuilder::CollapsibleContent::collapse):
(WebCore::Layout::LineBuilder::ContinuousContent::append): Deleted.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@254780 268f45cc-cd09-0410-ab3c-d52691b4dbfc