clutter/color-state: Pass the ClutterContext when constructing

This will be used to cache pipeline snippets shared by multiple color
states.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3433>

clutter/clutter/clutter-actor.c

@@ -17844,7 +17844,8 @@ create_default_color_state (ClutterActor *self)
 {
   ClutterColorState *color_state;
 
-  color_state = clutter_color_state_new (CLUTTER_COLORSPACE_DEFAULT,
+  color_state = clutter_color_state_new (clutter_actor_get_context (self),
+                                         CLUTTER_COLORSPACE_DEFAULT,
                                          CLUTTER_TRANSFER_FUNCTION_DEFAULT);
 
   return color_state;

clutter/clutter/clutter-color-state.c

@@ -57,6 +57,7 @@ enum
 {
   PROP_0,
 
+  PROP_CONTEXT,
   PROP_COLORSPACE,
   PROP_TRANSFER_FUNCTION,
 
@@ -74,6 +75,8 @@ struct _ClutterColorState
 
 struct _ClutterColorStatePrivate
 {
+  ClutterContext *context;
+
   ClutterColorspace colorspace;
   ClutterTransferFunction transfer_function;
 };
@@ -142,6 +145,16 @@ clutter_color_state_get_transfer_function (ClutterColorState *color_state)
   return priv->transfer_function;
 }
 
+static void
+clutter_color_state_constructed (GObject *object)
+{
+  ClutterColorState *color_state = CLUTTER_COLOR_STATE (object);
+  ClutterColorStatePrivate *priv =
+    clutter_color_state_get_instance_private (color_state);
+
+  g_warn_if_fail (priv->context);
+}
+
 static void
 clutter_color_state_set_property (GObject      *object,
                                   guint         prop_id,
@@ -155,6 +168,10 @@ clutter_color_state_set_property (GObject      *object,
 
   switch (prop_id)
     {
+    case PROP_CONTEXT:
+      priv->context = g_value_get_object (value);
+      break;
+
     case PROP_COLORSPACE:
       priv->colorspace = g_value_get_enum (value);
       break;
@@ -176,9 +193,15 @@ clutter_color_state_get_property (GObject    *object,
                                   GParamSpec *pspec)
 {
   ClutterColorState *color_state = CLUTTER_COLOR_STATE (object);
+  ClutterColorStatePrivate *priv =
+    clutter_color_state_get_instance_private (color_state);
 
   switch (prop_id)
     {
+    case PROP_CONTEXT:
+      g_value_set_object (value, priv->context);
+      break;
+
     case PROP_COLORSPACE:
       g_value_set_enum (value,
                         clutter_color_state_get_colorspace (color_state));
@@ -200,9 +223,22 @@ clutter_color_state_class_init (ClutterColorStateClass *klass)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 
+  gobject_class->constructed = clutter_color_state_constructed;
   gobject_class->set_property = clutter_color_state_set_property;
   gobject_class->get_property = clutter_color_state_get_property;
 
+  /**
+   * ClutterColorState:context:
+   *
+   * The associated ClutterContext.
+   */
+  obj_props[PROP_CONTEXT] =
+    g_param_spec_object ("context", NULL, NULL,
+                         CLUTTER_TYPE_CONTEXT,
+                         G_PARAM_READWRITE |
+                         G_PARAM_STATIC_STRINGS |
+                         G_PARAM_CONSTRUCT_ONLY);
+
   /**
    * ClutterColorState:colorspace:
    *
@@ -246,10 +282,12 @@ clutter_color_state_init (ClutterColorState *color_state)
  * Return value: A new ClutterColorState object.
  **/
 ClutterColorState *
-clutter_color_state_new (ClutterColorspace       colorspace,
+clutter_color_state_new (ClutterContext          *context,
+                         ClutterColorspace        colorspace,
                          ClutterTransferFunction  transfer_function)
 {
   return g_object_new (CLUTTER_TYPE_COLOR_STATE,
+                       "context", context,
                        "colorspace", colorspace,
                        "transfer-function", transfer_function,
                        NULL);

clutter/clutter/clutter-color-state.h

@@ -39,7 +39,8 @@ G_DECLARE_FINAL_TYPE (ClutterColorState, clutter_color_state,
                       GObject)
 
 CLUTTER_EXPORT
-ClutterColorState * clutter_color_state_new (ClutterColorspace       colorspace,
+ClutterColorState * clutter_color_state_new (ClutterContext          *context,
+                                             ClutterColorspace        colorspace,
                                              ClutterTransferFunction  transfer_function);
 
 CLUTTER_EXPORT

src/backends/meta-stage.c

@@ -358,7 +358,9 @@ meta_stage_new (MetaBackend *backend)
   MetaStage *stage;
   MetaMonitorManager *monitor_manager;
 
-  stage = g_object_new (META_TYPE_STAGE, NULL);
+  stage = g_object_new (META_TYPE_STAGE,
+                        "context", meta_backend_get_clutter_context (backend),
+                        NULL);
   stage->backend = backend;
 
   monitor_manager = meta_backend_get_monitor_manager (backend);

src/tests/clutter/conform/actor-color-state.c

@@ -46,12 +46,14 @@ actor_color_state_default (void)
 static void
 actor_color_state_passed (void)
 {
+  ClutterContext *context = clutter_test_get_context ();
   ClutterActor *actor;
   ClutterColorState *color_state;
   ClutterColorspace colorspace;
   ClutterTransferFunction transfer_function;
 
-  color_state = clutter_color_state_new (CLUTTER_COLORSPACE_BT2020,
+  color_state = clutter_color_state_new (context,
+                                         CLUTTER_COLORSPACE_BT2020,
                                          CLUTTER_TRANSFER_FUNCTION_PQ);
 
   if (!color_state)
@@ -81,6 +83,7 @@ actor_color_state_passed (void)
 static void
 actor_change_color_state (void)
 {
+  ClutterContext *context = clutter_test_get_context ();
   ClutterActor *actor;
   ClutterColorState *color_state;
   ClutterColorspace colorspace;
@@ -88,7 +91,8 @@ actor_change_color_state (void)
 
   actor = clutter_actor_new ();
 
-  color_state = clutter_color_state_new (CLUTTER_COLORSPACE_BT2020,
+  color_state = clutter_color_state_new (context,
+                                         CLUTTER_COLORSPACE_BT2020,
                                          CLUTTER_TRANSFER_FUNCTION_PQ);
 
   if (!color_state)