[Webkit-unassigned] [Bug 83045] New: Improve line breaking performance for complex text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=83045

           Summary: Improve line breaking performance for complex text
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: nholbrook at apple.com


Profiling on Mac and iOS has shown that measuring complex text by creating a ComplexTextController for each word is suboptimal. This patch addresses this for RenderBlock::LineBreaker::nextLineBreak by creating and reusing a ComplexTextController per RenderText. Benchmarks using a simple test app show a 35% improvement when laying out a paragraph of English text with optimizeLegibility.

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