[Webkit-unassigned] [Bug 44375] New: Copying Paths is expensive. toPathData() should avoid causing a copy.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=44375

           Summary: Copying Paths is expensive.  toPathData() should avoid
                    causing a copy.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: eric at webkit.org
                CC: zimmermann at kde.org, krit at webkit.org, kbr at google.com


Copying Paths is expensive.  toPathData() should avoid causing a copy.

http://themaninblue.com/experiment/AnimationBenchmark/svg

source: http://themaninblue.com/experiment/AnimationBenchmark/svg/js/main.js

We're spending 3% of that benchmark in Path::operator=  Crazy!  (45% is spent in RenderPath::paint().)  toPathData() always causes a copy of the Path which is expensive (at least for CoreGraphics as it's a malloc).

We either should make Path, COW, or we should find a way to avoid this copy in this return.

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