[PATCH] ui/gtk: skip refresh if new dmabuf has been submitted

[Dongwon Kim <dongwon.kim@intel.com>]

Skip refresh if a new dmabuf (guest scanout frame) has already been
submitted and ready to be drawn because the scanout will be updated
with new frame anyway.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
---
 ui/gtk-egl.c     | 4 ++++
 ui/gtk-gl-area.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/ui/gtk-egl.c b/ui/gtk-egl.c
index d59b8cd7d7..859aa8185e 100644
--- a/ui/gtk-egl.c
+++ b/ui/gtk-egl.c
@@ -144,6 +144,10 @@ void gd_egl_refresh(DisplayChangeListener *dcl)
     gd_update_monitor_refresh_rate(
             vc, vc->window ? vc->window : vc->gfx.drawing_area);
 
+    if (vc->gfx.guest_fb.dmabuf && vc->gfx.guest_fb.dmabuf->draw_submitted) {
+        return;
+    }
+
     if (!vc->gfx.esurface) {
         gd_egl_init(vc);
         if (!vc->gfx.esurface) {
diff --git a/ui/gtk-gl-area.c b/ui/gtk-gl-area.c
index 7367dfd793..7da75bd025 100644
--- a/ui/gtk-gl-area.c
+++ b/ui/gtk-gl-area.c
@@ -123,6 +123,10 @@ void gd_gl_area_refresh(DisplayChangeListener *dcl)
 
     gd_update_monitor_refresh_rate(vc, vc->window ? vc->window : vc->gfx.drawing_area);
 
+    if (vc->gfx.guest_fb.dmabuf && vc->gfx.guest_fb.dmabuf->draw_submitted) {
+        return;
+    }
+
     if (!vc->gfx.gls) {
         if (!gtk_widget_get_realized(vc->gfx.drawing_area)) {
             return;
-- 
2.34.1