[mutter] window-actor: Add a debugging tool to write a region to a PNG

[Jasper St. Pierre <jstpierre src gnome org>]

commit 30bc8bc6ce079a69cc933d9fe0a2d5a928be3b81
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sun Apr 29 04:44:53 2012 -0400

    window-actor: Add a debugging tool to write a region to a PNG
    
    Just a helper function that I keep rewriting all over the place.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=676052

 src/compositor/meta-window-actor.c |   22 +++++++++++++++++++++-
 1 files changed, 21 insertions(+), 1 deletions(-)
---
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index fb5b0c8..d7c8891 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -1684,7 +1684,7 @@ meta_window_actor_get_obscured_region (MetaWindowActor *self)
 #if 0
 /* Print out a region; useful for debugging */
 static void
-dump_region (cairo_region_t *region)
+print_region (cairo_region_t *region)
 {
   int n_rects;
   int i;
@@ -1702,6 +1702,26 @@ dump_region (cairo_region_t *region)
 }
 #endif
 
+#if 0
+/* Dump a region to a PNG file; useful for debugging */
+static void
+see_region (cairo_region_t *region,
+            int             width,
+            int             height,
+            char           *filename)
+{
+  cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
+  cairo_t *cr = cairo_create (surface);
+
+  gdk_cairo_region (cr, region);
+  cairo_fill (cr);
+
+  cairo_surface_write_to_png (surface, filename);
+  cairo_destroy (cr);
+  cairo_surface_destroy (surface);
+}
+#endif
+
 /**
  * meta_window_actor_set_visible_region:
  * @self: a #MetaWindowActor