[Webkit-unassigned] [Bug 156039] New: putImageData leaves visible artifacts on retina display

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Mar 30 13:30:18 PDT 2016


https://bugs.webkit.org/show_bug.cgi?id=156039

            Bug ID: 156039
           Summary: putImageData leaves visible artifacts on retina
                    display
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bert at freudenbergs.de
                CC: dino at apple.com

On a retina display, putImageData leaves gribblies around the affected area's border. Changing the page zoom clears these artifacts, proving that the actual canvas content is correct.

To reproduce I have isolated a simple test case here:
http://bertfreudenberg.github.io/SqueakJS/test/putImageData.html

In production this manifests e.g. when trying to move a window here:
https://bertfreudenberg.github.io/SqueakJS/demo/simple.html

Note that the gribblies do not show up when using pixelated image-rendering:
https://bertfreudenberg.github.io/SqueakJS/demo/simple.html#pixelated

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