[Webkit-unassigned] [Bug 272455] New: [GTK][WPE] Ensure that WebGL changes trigger a single composition

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=272455

            Bug ID: 272455
           Summary: [GTK][WPE] Ensure that WebGL changes trigger a single
                    composition
           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

When there are WebGL changes, the canvas indicates that it needs to be displayed, which triggers a layerFlush:
- During this layerflush, Nicosia::GCGLANGLELayer::swapBuffersIfNeeded() is called, which pushes a new buffer into TextureMapperPlatformLayerProxy[GL|DMABuf]. In response to this, the proxy requests a composition directly to the compositor to show the new content.
- At the end of the layerFlush, a composition to show the modified content is always made.
- This causes that we have 2 compositions requested. Depending on the conditions, these two requests can be merged into a single one or trigger two different compositions, which is a waste or resources and can desync the equilibrium between the main thread and the composition.

We need to ensure that WebGL changes request a single composition.

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