[Webkit-unassigned] [Bug 203240] New: [GTK][WPE] shape-outside property defined from an animated image doesn't work properly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203240

            Bug ID: 203240
           Summary: [GTK][WPE] shape-outside property defined from an
                    animated image doesn't work properly
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: magomez at igalia.com
                CC: bugs-noreply at webkitgtk.org

According to the spec, when using an animated image, the shape must be generated from the first frame. But this is not happening and the shape is updated following the animation. I think this might be an issue in multiplatform code: in order to create the shape, BitmapImage::draw() is called, which starts the animation, and I don't see how the animation is stopped at any point. With every new frame decoded RenderBox::imageChanged() gets called, which invalidates the shape and it's created again from the next frame. We could avoid decoding the animation completely, and just decode the first frame.
This is causing that tests
css3/shapes/shape-outside/shape-image/shape-image-025.html
imported/w3c/web-platform-tests/css/css-shapes/shape-outside/shape-image/shape-image-025.html
are failing both on GTK and WPE ports. They are passing for Apple, but I'm not sure it's because it's working properly. Gotta look into it.

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