[Webkit-unassigned] [Bug 159455] New: [GTK] Web view background colors don't work in accelerated compositing mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159455

            Bug ID: 159455
           Summary: [GTK] Web view background colors don't work in
                    accelerated compositing mode
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org, yoon at igalia.com,
                    zan at falconsigh.net
            Blocks: 154066

This can be easily tested with MiniBrowser, for example:

$ WEBKIT_FORCE_COMPOSITING_MODE=1 MiniBrowser --bg-color="rgba(255, 0, 0, 0.70)" -e

The background is opaque white, and there are artifacts when resizing the window (because the web process is not rendering backgrounds when setting a web view bg color). This needs changes in the UI process when using the redirected window, but also in the web process. And of course it always happens with the threaded compositor when ACC mode is always enabled.

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