util: Add 'color' debug topic

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2141>

src/backends/native/meta-monitor-manager-native.c

@@ -508,7 +508,8 @@ meta_monitor_manager_native_set_crtc_gamma (MetaMonitorManager *manager,
                                                  red, green, blue));
 
   gamma_ramp_string = generate_gamma_ramp_string (size, red, green, blue);
-  g_debug ("Setting CRTC (%" G_GUINT64_FORMAT ") gamma to %s",
+  meta_topic (META_DEBUG_COLOR,
+              "Setting CRTC (%" G_GUINT64_FORMAT ") gamma to %s",
               meta_crtc_get_id (crtc), gamma_ramp_string);
 
   meta_crtc_kms_invalidate_gamma (crtc_kms);

src/core/util.c

@@ -73,6 +73,7 @@ static const GDebugKey meta_debug_keys[] = {
   { "remote-desktop", META_DEBUG_REMOTE_DESKTOP },
   { "backend", META_DEBUG_BACKEND },
   { "render", META_DEBUG_RENDER },
+  { "color", META_DEBUG_COLOR },
 };
 
 static gint verbose_topics = 0;
@@ -317,6 +318,8 @@ meta_topic_to_string (MetaDebugTopic topic)
       return "BACKEND";
     case META_DEBUG_RENDER:
       return "RENDER";
+    case META_DEBUG_COLOR:
+      return "COLOR";
     case META_DEBUG_VERBOSE:
       return "VERBOSE";
     }

src/meta/util.h

@@ -74,6 +74,7 @@ void meta_fatal      (const char *format,
  * @META_DEBUG_REMOTE_DESKTOP: remote desktop
  * @META_DEBUG_BACKEND: backend
  * @META_DEBUG_RENDER: native backend rendering
+ * @META_DEBUG_COLOR: color management
  */
 typedef enum
 {
@@ -104,6 +105,7 @@ typedef enum
   META_DEBUG_REMOTE_DESKTOP  = 1 << 23,
   META_DEBUG_BACKEND         = 1 << 24,
   META_DEBUG_RENDER          = 1 << 25,
+  META_DEBUG_COLOR           = 1 << 26,
 } MetaDebugTopic;
 
 /**