[Webkit-unassigned] [Bug 273316] New: [GTK][WPE][Skia] Disable accelerated ImageBitmap support

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273316

            Bug ID: 273316
           Summary: [GTK][WPE][Skia] Disable accelerated ImageBitmap
                    support
           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

ImageBitmap is backed by an ImageBuffer whose implementation can be accelerated or not. In order to create the accelerated ImageBuffer for this, we need to make the skiaGLContext current. But ImageBitmaps can be created in worker threads, which requires making the skiaGLContext current in that thread, when it's intended to be used in the main thread only. This can cause glitches or even crashes.

In order to fix this, we need to add support for having per thread skiaGLContexts, so each thread has its own context and doesn't mess with the others. But this is not as urgent at this point of the migration. For the moment we're disabling the accelerated support for ImageBitmaps, which removes the problem. We will be back to this a bit later, when we add the implementation for the offscreen canvas, where per thread gl contexts are required.

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