[Webkit-unassigned] [Bug 43815] New: Heavy use of shadow blur is slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=43815

           Summary: Heavy use of shadow blur is slow
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://muro.deviantart.com
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mike at michaeldewey.org


Webkit's implementation of <canvas> has some issues when it tries to do a lot of drawing with high shadow blur.  In every other area of <canvas> rendering webkit is much faster than gecko browsers, but in this case it grinds to a crawl where gecko browsers render at about the same speed.

In the referenced web page, the "basic" brush and "paintbrush" use shadows to draw soft lines.  I had to make it so the maximum softness on webkit browsers is only 20% of what maximum softness is on gecko browsers because it was otherwise unusable.

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