[Webkit-unassigned] [Bug 46319] New: Lots of fast canvas updates fail to completely render

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=46319

           Summary: Lots of fast canvas updates fail to completely render
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://kanaka.github.com/noVNC/webkit_canvas_bug.html
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: webkit at martintribe.org


This page demonstrates the problem: http://kanaka.github.com/noVNC/webkit_canvas_bug.html

When you press the Start button, the noVNC engine will playback the beginning of a VNC/RFB session. You should see a complete 1024x768 Ubuntu desktop rendered below. However, only the first few rows of pixels will render.

Note that the canvas operations have succeeded, but they are simply not rendering correctly; if you resize the browser slightly, the entire desktop will immediately render. Also, if part of the canvas is out of view, when you scroll it into view, those parts show correct rendering.

I bifurcated using Chromium nightly builds on Linux to determine that the problem was introduced after WebKit revision 66240 and before (or in) WebKit revision 66396.

I have also verified that the problem still exists in WebKit-r67643 on Linux and also in the r67637 WebKit nightly build on Windows XP.

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