[Webkit-unassigned] [Bug 172461] New: A big animated image can be decoded as a large static image before receiving all the data

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172461

            Bug ID: 172461
           Summary: A big animated image can be decoded as a large static
                    image before receiving all the data
           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

This case happened while testing a page with 11 large animated images and it happened only with an image with size = 75MB and 377 frames. So getting a layout test for this scenario will not be easy.

This scenario leads to assertions in BitmapImage::imageFrameAvailableAtIndex() and BitmapImage::draw() since these function expects the decoding of an animated image is completely separate from the beginning and from the beginning. We need to handle the case of decoding the first frame for the first repetition different from decoding the other frames and from the other repetitions.

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