console: add dpy_gl_scanout_disable
Helper function (and DisplayChangeListenerOps ptr) to disable scanouts. Replaces using dpy_gl_scanout_texture with 0x0 size and no texture specified. Allows cleanups to make the io and gfx emulation code more readable. Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Message-id: 1487669841-13668-3-git-send-email-kraxel@redhat.com
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