[mutter] color: Emit signal when device is updated

[Marge Bot <marge-bot src gnome org>]

commit ceedc0e5fbcccded3b1ffec1fd9dab7e6f74874e
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Dec 6 11:40:46 2021 +0100

    color: Emit signal when device is updated
    
    Will be emitted when a device updated its color state. Will be used by
    an X11 color manager implementation, and tests.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2165>

 src/backends/meta-color-device.c  |  9 +++++++++
 src/backends/meta-color-manager.c | 27 +++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
---
diff --git a/src/backends/meta-color-device.c b/src/backends/meta-color-device.c
index 3bfe776a27..108efeaafb 100644
--- a/src/backends/meta-color-device.c
+++ b/src/backends/meta-color-device.c
@@ -37,6 +37,7 @@ enum
 {
   READY,
   CHANGED,
+  UPDATED,
 
   N_SIGNALS
 };
@@ -322,6 +323,12 @@ meta_color_device_class_init (MetaColorDeviceClass *klass)
                   G_SIGNAL_RUN_LAST, 0,
                   NULL, NULL, NULL,
                   G_TYPE_NONE, 0);
+  signals[UPDATED] =
+    g_signal_new ("updated",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST, 0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 0);
 }
 
 static void
@@ -1133,4 +1140,6 @@ meta_color_device_update (MetaColorDevice *color_device,
                                                lut_size);
 
   meta_monitor_set_gamma_lut (monitor, lut);
+
+  g_signal_emit (color_device, signals[UPDATED], 0);
 }
diff --git a/src/backends/meta-color-manager.c b/src/backends/meta-color-manager.c
index 6702e34ffe..b460c7238c 100644
--- a/src/backends/meta-color-manager.c
+++ b/src/backends/meta-color-manager.c
@@ -57,6 +57,15 @@
 
 #define DEFAULT_TEMPERATURE 6500 /* Kelvin */
 
+enum
+{
+  DEVICE_UPDATED,
+
+  N_SIGNALS
+};
+
+static guint signals[N_SIGNALS];
+
 enum
 {
   PROP_0,
@@ -122,6 +131,13 @@ on_device_changed (MetaColorDevice  *color_device,
   meta_color_device_update (color_device, priv->temperature);
 }
 
+static void
+on_device_updated (MetaColorDevice  *color_device,
+                   MetaColorManager *color_manager)
+{
+  g_signal_emit (color_manager, signals[DEVICE_UPDATED], 0, color_device);
+}
+
 static char *
 generate_monitor_id (MetaMonitor *monitor)
 {
@@ -202,6 +218,9 @@ update_devices (MetaColorManager *color_manager)
           g_signal_connect_object (color_device, "changed",
                                    G_CALLBACK (on_device_changed),
                                    color_manager, 0);
+          g_signal_connect_object (color_device, "updated",
+                                   G_CALLBACK (on_device_updated),
+                                   color_manager, 0);
         }
     }
 
@@ -490,6 +509,14 @@ meta_color_manager_class_init (MetaColorManagerClass *klass)
                          G_PARAM_CONSTRUCT_ONLY |
                          G_PARAM_STATIC_STRINGS);
   g_object_class_install_properties (object_class, N_PROPS, obj_props);
+
+  signals[DEVICE_UPDATED] =
+    g_signal_new ("device-updated",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST, 0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 1,
+                  META_TYPE_COLOR_DEVICE);
 }
 
 static void