[Webkit-unassigned] [Bug 54256] New: Improve the compression of Canvas's toDataURL function

Thu Feb 10 16:05:40 PST 2011

https://bugs.webkit.org/show_bug.cgi?id=54256

           Summary: Improve the compression of Canvas's toDataURL function
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tabatkins at google.com
                CC: mdelaney at apple.com

Canvas's toDataURL function has horrible PNG compression for simple images.  For example, running the following page gets me a data url 2.8kb in size:

<!doctype html>
<script>
var x = document.createElement('canvas');
x.width = 500;
x.height = 500;
var y = x.getContext('2d');
y.fillRect(0,0,500,500);
alert(x.toDataURL().length);
</script>

Saving the generated image and running it through http://www.pngoptimizer.com/ gives me an equivalent image that is only 125 bytes in size.  We should be able to generate images similar in size.

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