[Webkit-unassigned] [Bug 54912] New: Minimize calls to ubrk_setText()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=54912

           Summary: Minimize calls to ubrk_setText()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: nholbrook at apple.com


Text requiring ICU line breaking involves many calls to ubrk_setText(), or one per invocation of WebCore::isBreakable(). It should be possible to only call ubrk_setText() once per RenderText.

For example, a test app drawing a paragraph of Japanese text currently requires 164 ubrk_setText() calls, but only one is strictly necessary in this case. A quick benchmark of this case showed a 3% overall speedup over 1000 iterations.

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