actor: Create a PangoContext per actor

For a variety of complicated reasons, ClutterText currently sets fields
on the PangoContext when creating a layout. This causes ClutterText to
behave somewhat erratically in certain cases, since the PangoContext is
currently shared between all actors.

GTK+ creates a PangoContext for every single GtkWidget, so it seems like
we should do the same here.

Move the private code that was previously in clutter-main.c into
clutter-actor.c and clean it up a bit. This gives every actor its own
PangoContext it can mutilate whenever it wants, at its heart's content.

https://bugzilla.gnome.org/show_bug.cgi?id=739050

clutter/clutter-actor.c

@@ -15474,6 +15474,46 @@ clutter_actor_grab_key_focus (ClutterActor *self)
     clutter_stage_set_key_focus (CLUTTER_STAGE (stage), self);
 }
 
+static void
+update_pango_context (ClutterBackend *backend,
+                      PangoContext   *context)
+{
+  ClutterSettings *settings;
+  PangoFontDescription *font_desc;
+  const cairo_font_options_t *font_options;
+  gchar *font_name;
+  PangoDirection pango_dir;
+  gdouble resolution;
+
+  settings = clutter_settings_get_default ();
+
+  /* update the text direction */
+  if (clutter_get_default_text_direction () == CLUTTER_TEXT_DIRECTION_RTL)
+    pango_dir = PANGO_DIRECTION_RTL;
+  else
+    pango_dir = PANGO_DIRECTION_LTR;
+
+  pango_context_set_base_dir (context, pango_dir);
+
+  g_object_get (settings, "font-name", &font_name, NULL);
+
+  /* get the configuration for the PangoContext from the backend */
+  font_options = clutter_backend_get_font_options (backend);
+  resolution = clutter_backend_get_resolution (backend);
+
+  font_desc = pango_font_description_from_string (font_name);
+
+  if (resolution < 0)
+    resolution = 96.0; /* fall back */
+
+  pango_context_set_font_description (context, font_desc);
+  pango_cairo_context_set_font_options (context, font_options);
+  pango_cairo_context_set_resolution (context, resolution);
+
+  pango_font_description_free (font_desc);
+  g_free (font_name);
+}
+
 /**
  * clutter_actor_get_pango_context:
  * @self: a #ClutterActor
@@ -15500,16 +15540,23 @@ PangoContext *
 clutter_actor_get_pango_context (ClutterActor *self)
 {
   ClutterActorPrivate *priv;
+  ClutterBackend *backend = clutter_get_default_backend ();
 
   g_return_val_if_fail (CLUTTER_IS_ACTOR (self), NULL);
 
   priv = self->priv;
 
-  if (priv->pango_context != NULL)
+  if (G_UNLIKELY (priv->pango_context == NULL))
-    return priv->pango_context;
+    {
+      priv->pango_context = clutter_actor_create_pango_context (self);
 
-  priv->pango_context = _clutter_context_get_pango_context ();
+      g_signal_connect_object (backend, "resolution-changed",
-  g_object_ref (priv->pango_context);
+                               G_CALLBACK (update_pango_context), priv->pango_context, 0);
+      g_signal_connect_object (backend, "font-changed",
+                               G_CALLBACK (update_pango_context), priv->pango_context, 0);
+    }
+  else
+    update_pango_context (backend, priv->pango_context);
 
   return priv->pango_context;
 }
@@ -15533,9 +15580,16 @@ clutter_actor_get_pango_context (ClutterActor *self)
 PangoContext *
 clutter_actor_create_pango_context (ClutterActor *self)
 {
-  g_return_val_if_fail (CLUTTER_IS_ACTOR (self), NULL);
+  CoglPangoFontMap *font_map;
+  PangoContext *context;
 
-  return _clutter_context_create_pango_context ();
+  font_map = COGL_PANGO_FONT_MAP (clutter_get_font_map ());
+
+  context = cogl_pango_font_map_create_context (font_map);
+  update_pango_context (clutter_get_default_backend (), context);
+  pango_context_set_language (context, pango_language_get_default ());
+
+  return context;
 }
 
 /**

clutter/clutter-main.c

@@ -764,86 +764,6 @@ clutter_get_text_direction (void)
   return dir;
 }
 
-static void
-update_pango_context (ClutterBackend *backend,
-                      PangoContext   *context)
-{
-  ClutterSettings *settings;
-  PangoFontDescription *font_desc;
-  const cairo_font_options_t *font_options;
-  gchar *font_name;
-  PangoDirection pango_dir;
-  gdouble resolution;
-
-  settings = clutter_settings_get_default ();
-
-  /* update the text direction */
-  if (clutter_text_direction == CLUTTER_TEXT_DIRECTION_RTL)
-    pango_dir = PANGO_DIRECTION_RTL;
-  else
-    pango_dir = PANGO_DIRECTION_LTR;
-
-  pango_context_set_base_dir (context, pango_dir);
-
-  g_object_get (settings, "font-name", &font_name, NULL);
-
-  /* get the configuration for the PangoContext from the backend */
-  font_options = clutter_backend_get_font_options (backend);
-  resolution = clutter_backend_get_resolution (backend);
-
-  font_desc = pango_font_description_from_string (font_name);
-
-  if (resolution < 0)
-    resolution = 96.0; /* fall back */
-
-  pango_context_set_font_description (context, font_desc);
-  pango_cairo_context_set_font_options (context, font_options);
-  pango_cairo_context_set_resolution (context, resolution);
-
-  pango_font_description_free (font_desc);
-  g_free (font_name);
-}
-
-PangoContext *
-_clutter_context_get_pango_context (void)
-{
-  ClutterMainContext *self = _clutter_context_get_default ();
-
-  if (G_UNLIKELY (self->pango_context == NULL))
-    {
-      PangoContext *context;
-
-      context = _clutter_context_create_pango_context ();
-      self->pango_context = context;
-
-      g_signal_connect (self->backend, "resolution-changed",
-                        G_CALLBACK (update_pango_context),
-                        self->pango_context);
-      g_signal_connect (self->backend, "font-changed",
-                        G_CALLBACK (update_pango_context),
-                        self->pango_context);
-    }
-  else
-    update_pango_context (self->backend, self->pango_context);
-
-  return self->pango_context;
-}
-
-PangoContext *
-_clutter_context_create_pango_context (void)
-{
-  CoglPangoFontMap *font_map;
-  PangoContext *context;
-
-  font_map = clutter_context_get_pango_fontmap ();
-
-  context = cogl_pango_font_map_create_context (font_map);
-  update_pango_context (clutter_get_default_backend (), context);
-  pango_context_set_language (context, pango_language_get_default ());
-
-  return context;
-}
-
 /**
  * clutter_main_quit:
  *

clutter/clutter-private.h

@@ -198,8 +198,6 @@ ClutterMainContext *    _clutter_context_get_default                    (void);
 void                    _clutter_context_lock                           (void);
 void                    _clutter_context_unlock                         (void);
 gboolean                _clutter_context_is_initialized                 (void);
-PangoContext *          _clutter_context_create_pango_context           (void);
-PangoContext *          _clutter_context_get_pango_context              (void);
 ClutterPickMode         _clutter_context_get_pick_mode                  (void);
 void                    _clutter_context_push_shader_stack              (ClutterActor *actor);
 ClutterActor *          _clutter_context_pop_shader_stack               (ClutterActor *actor);