test-pixmap: Use the 'm' key to toggle texture quality

When the 'm' key is pressed it will now recursively look for all
ClutterTexture subclasses on the stage and toggle the texture quality
between high and low. This is useful to test the mipmap fallback.

tests/interactive/test-pixmap.c

@@ -49,6 +49,34 @@ static GOptionEntry g_options[] =
   { NULL }
 };
 
+static void
+toggle_texture_quality (ClutterActor *actor)
+{
+  if (CLUTTER_IS_CONTAINER (actor))
+    clutter_container_foreach (CLUTTER_CONTAINER (actor),
+                               (ClutterCallback) toggle_texture_quality,
+                               NULL);
+
+  if (CLUTTER_IS_TEXTURE (actor))
+    {
+      ClutterTextureQuality quality;
+
+      quality = clutter_texture_get_filter_quality (CLUTTER_TEXTURE (actor));
+
+      if (quality == CLUTTER_TEXTURE_QUALITY_HIGH)
+        quality = CLUTTER_TEXTURE_QUALITY_MEDIUM;
+      else
+        quality = CLUTTER_TEXTURE_QUALITY_HIGH;
+
+      g_print ("switching to quality %s for %p\n",
+               quality == CLUTTER_TEXTURE_QUALITY_HIGH
+               ? "high" : "medium",
+               actor);
+
+      clutter_texture_set_filter_quality (CLUTTER_TEXTURE (actor), quality);
+    }
+}
+
 static gboolean
 stage_key_release_cb (ClutterActor *actor,
 		      ClutterEvent *event,
@@ -60,6 +88,10 @@ stage_key_release_cb (ClutterActor *actor,
     case CLUTTER_Q:
       clutter_main_quit ();
       break;
+
+    case CLUTTER_m:
+      toggle_texture_quality (actor);
+      break;
     }
   return FALSE;
 }