[Webkit-unassigned] [Bug 82147] New: canvas renders slowly possibly related to scaling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=82147

           Summary: canvas renders slowly possibly related to scaling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://www.peepo.com
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: j.chetwynd at btinternet.com


apologies there is currently no reduced test case, as I am awaiting input from contributors to related bugs
bug68635
bug3781

try:
http://localhost/talks/mcts.html
renders well in recent safari

and
similar code is used to render
http://www.peepo.com
click on golden key and tick mcts.
click on board,
if rendering bug is not evident,
adjust speed, in bottom left repeatedly click on thinking symbol to make slower,
ie more animated colour.
click on board,

in my tests only 25% or less of board is rendered in time
as a partial irregular box, from top left corner

bilinear lerp is used to generate large colour map,
which firefox renders smoothly at all speeds, on 2.26 Ghz core2duo

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