[Webkit-unassigned] [Bug 23050] New: Copying Fonts by value makes GraphicsContext::save() and restore() expensive

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=23050

           Summary: Copying Fonts by value makes GraphicsContext::save() and
                    restore() expensive
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com


I have a Shark sample (generated from the testcase in bug 19312) that shows
that GraphicsContext::save() and restore() are pretty expensive; in this test.
they take 11.7% and 23% of the entire sample (of which 87% is in painting).

Focusing on GraphicsContext::restore(), GraphicsContext::operator= is 65%,
including 58% from Font::operator=. Vector::removeLast is 19%, and
restorePlatformState() is 14%. Of the Font::operator= cost, almost all is in
the GlyphPageTreeNode hash table copy.

Inside GraphicsContext::save(), 62% is in the Font constructor, and 22% is
savePlatformState.


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