[Webkit-unassigned] [Bug 178039] New: HTMLImageElement.decode() should optimize the decoding for the image intrinsic size

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178039

            Bug ID: 178039
           Summary: HTMLImageElement.decode() should optimize the decoding
                    for the image intrinsic size
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com

If the HTMLImageElement has an intrinsic size, the decode() method should use it instead of decoding the image for the native size.

The intrinsic size of an HTMLImageElement can be set to the width and the height attributes of the <img> element. Example is:
    <img width="200" height="100>

Or it can be set from the javascript. Example is:
    var image = new Image(200, 100);

If the intrinsic size is used, decoding the image and drawing it will be much faster than using the native size. This is because a large image will not be scaled down when it is drawn into a smaller rectangle.

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