[mutter] clutter/stage-cogl: Only construct damage array if it'll be used

[verdre <jonasd src gnome org>]

commit 9e340287421bea690c9ef9606e7c121c7368e446
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed May 13 17:18:50 2020 +0200

    clutter/stage-cogl: Only construct damage array if it'll be used
    
    It's only used when we actually swap buffers, which we only do if the
    target framebuffer is an onscreen.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1237

 clutter/clutter/cogl/clutter-stage-cogl.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)
---
diff --git a/clutter/clutter/cogl/clutter-stage-cogl.c b/clutter/clutter/cogl/clutter-stage-cogl.c
index 8d025d008c..042621448c 100644
--- a/clutter/clutter/cogl/clutter-stage-cogl.c
+++ b/clutter/clutter/cogl/clutter-stage-cogl.c
@@ -378,24 +378,24 @@ swap_framebuffer (ClutterStageWindow *stage_window,
                   gboolean            swap_with_damage)
 {
   CoglFramebuffer *framebuffer = clutter_stage_view_get_onscreen (view);
-  int *damage, n_rects, i;
-
-  n_rects = cairo_region_num_rectangles (swap_region);
-  damage = g_newa (int, n_rects * 4);
-  for (i = 0; i < n_rects; i++)
-    {
-      cairo_rectangle_int_t rect;
-
-      cairo_region_get_rectangle (swap_region, i, &rect);
-      damage[i * 4] = rect.x;
-      damage[i * 4 + 1] = rect.y;
-      damage[i * 4 + 2] = rect.width;
-      damage[i * 4 + 3] = rect.height;
-    }
 
   if (cogl_is_onscreen (framebuffer))
     {
       CoglOnscreen *onscreen = COGL_ONSCREEN (framebuffer);
+      int *damage, n_rects, i;
+
+      n_rects = cairo_region_num_rectangles (swap_region);
+      damage = g_newa (int, n_rects * 4);
+      for (i = 0; i < n_rects; i++)
+        {
+          cairo_rectangle_int_t rect;
+
+          cairo_region_get_rectangle (swap_region, i, &rect);
+          damage[i * 4] = rect.x;
+          damage[i * 4 + 1] = rect.y;
+          damage[i * 4 + 2] = rect.width;
+          damage[i * 4 + 3] = rect.height;
+        }
 
       /* push on the screen */
       if (n_rects > 0 && !swap_with_damage)