[Webkit-unassigned] [Bug 84282] New: Editing large canvas elements causes transformed text elsewhere on the page to render poorly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=84282

           Summary: Editing large canvas elements causes transformed text
                    elsewhere on the page to render poorly
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jason at desmos.com


If there is a canvas element on the page with width and height larger than 71, text anywhere on the page will lose rasterization fidelity when the canvas API is used. This problem exists in the current public version of Chrome as well, but the magic number there is 256x256.

Here are jsfiddles demonstrating the problem:

canvas size below threshold, scaled text looks good: http://jsfiddle.net/AQk5z/2/

canvas size above threshold, scaled text looks bad after using canvas API: http://jsfiddle.net/BxrXk/1/

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