[Webkit-unassigned] [Bug 56925] New: Canvas text measurements wrong

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=56925

           Summary: Canvas text measurements wrong
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://jsfiddle.net/k44x3/1/
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hannasm at gmail.com
                CC: mdelaney at apple.com


I've created a good test case for this issue at jsfiddle url.

http://jsfiddle.net/k44x3/1/

Using a dom / javascript based text measurement approach, safari yields the actual width of the text.

Using canvas based approach the text measurement jumps around and becomes wildly inaccurate as text length increases.

Tested in nightly snapshot WebKit-SVN-r80840

Oddly, versions of chrome from the oldest version 1.0 to latest 10.0 handle these measurements fine, and I thought chrome integrated webkit so don't ask me how that happened. MOST versions of chrome i tested on were reporting webkit version 534 instead of the 533 that is reported for safari (by jquery browser detection.

This test case generates accurate measurements in firefox and opera versions i've tested too.

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