st/texture-cache: Return a GIcon from bind_cairo_surface_property()

We still load the surface into an StImageContent, but instead of
adding the content to an actor we hand out, return the content
itself (as GIcon).

That means we lose the ability to specify an icon size, but as we
get the pixel data from a fixed-size surface anyway, that shouldn't
matter much in practice.

Not to mention that the function is only used for fallback X11 icons,
which are already shit more often than not.

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1342

src/shell-app.c

@@ -180,66 +180,24 @@ window_backed_app_get_window (ShellApp     *app)
     return NULL;
 }
 
-static ClutterActor *
+static GIcon *
-window_backed_app_get_icon (ShellApp *app,
+window_backed_app_get_icon (ShellApp *app)
-                            int       size)
 {
   MetaWindow *window = NULL;
-  StWidget *widget;
-  int scale, scaled_size;
-  ShellGlobal *global;
-  StThemeContext *context;
-
-  global = shell_global_get ();
-  context = st_theme_context_get_for_stage (shell_global_get_stage (global));
-  g_object_get (context, "scale-factor", &scale, NULL);
-
-  scaled_size = size * scale;
 
   /* During a state transition from running to not-running for
    * window-backend apps, it's possible we get a request for the icon.
-   * Avoid asserting here and just return an empty image.
+   * Avoid asserting here and just return a fallback icon
    */
   if (app->running_state != NULL)
     window = window_backed_app_get_window (app);
 
-  if (window == NULL)
+  if (window &&
-    {
+      meta_window_get_client_type (window) == META_WINDOW_CLIENT_TYPE_X11)
-      ClutterActor *actor;
+    return st_texture_cache_bind_cairo_surface_property (st_texture_cache_get_default (),
-
+                                                         G_OBJECT (window),
-      actor = clutter_actor_new ();
+                                                         "icon");
-      g_object_set (actor,
+  return g_themed_icon_new ("application-x-executable");
-                    "opacity", 0,
-                    "width", (float) scaled_size,
-                    "height", (float) scaled_size,
-                    NULL);
-      return actor;
-    }
-
-  if (meta_window_get_client_type (window) == META_WINDOW_CLIENT_TYPE_X11)
-    {
-      StWidget *texture_actor;
-
-      texture_actor =
-        st_texture_cache_bind_cairo_surface_property (st_texture_cache_get_default (),
-                                                      G_OBJECT (window),
-                                                      "icon",
-                                                      scaled_size);
-
-      widget = g_object_new (ST_TYPE_BIN,
-                             "child", texture_actor,
-                             NULL);
-    }
-  else
-    {
-      widget = g_object_new (ST_TYPE_ICON,
-                             "icon-size", size,
-                             "icon-name", "application-x-executable",
-                             NULL);
-    }
-  st_widget_add_style_class_name (widget, "fallback-app-icon");
-
-  return CLUTTER_ACTOR (widget);
 }
 
 /**
@@ -254,17 +212,24 @@ ClutterActor *
 shell_app_create_icon_texture (ShellApp   *app,
                                int         size)
 {
-  GIcon *icon;
+  g_autoptr (GIcon) icon = NULL;
   ClutterActor *ret;
 
-  if (app->info == NULL)
-    return window_backed_app_get_icon (app, size);
-
   ret = st_icon_new ();
   st_icon_set_icon_size (ST_ICON (ret), size);
   st_icon_set_fallback_icon_name (ST_ICON (ret), "application-x-executable");
 
-  icon = g_app_info_get_icon (G_APP_INFO (app->info));
+  if (app->info == NULL)
+    {
+      icon = window_backed_app_get_icon (app);
+      st_widget_add_style_class_name (ST_WIDGET (ret), "fallback-app-icon");
+    }
+  else
+    {
+      icon = g_app_info_get_icon (G_APP_INFO (app->info));
+      g_object_ref (icon);
+    }
+
   st_icon_set_gicon (ST_ICON (ret), icon);
 
   return ret;

src/st/st-texture-cache.c

@@ -722,8 +722,7 @@ load_texture_async (StTextureCache       *cache,
 
 typedef struct {
   StTextureCache *cache;
-  ClutterActor *actor;
+  ClutterContent *image;
-  gint size;
   GObject *source;
   gulong notify_signal_id;
   gboolean weakref_active;
@@ -742,37 +741,33 @@ st_texture_cache_reset_texture (StTextureCachePropertyBind *bind,
       (cairo_image_surface_get_format (surface) == CAIRO_FORMAT_ARGB32 ||
        cairo_image_surface_get_format (surface) == CAIRO_FORMAT_RGB24))
     {
-      g_autoptr(ClutterContent) image = NULL;
       g_autoptr(GError) error = NULL;
-      int size = bind->size;
+      int width, height, size;
 
-      if (size < 0)
+      width = cairo_image_surface_get_width (surface);
-        clutter_actor_get_preferred_width (bind->actor, -1, NULL, (float *)&size);
+      height = cairo_image_surface_get_width (surface);
+      size = MAX(width, height);
 
-      image = clutter_actor_get_content (bind->actor);
+      if (!bind->image)
-      if (!image || !CLUTTER_IS_IMAGE (image))
+        bind->image = st_image_content_new_with_preferred_size (size, size);
-        image = st_image_content_new_with_preferred_size (size, size);
-      else
-        g_object_ref (image);
 
-      clutter_image_set_data (CLUTTER_IMAGE (image),
+      clutter_image_set_data (CLUTTER_IMAGE (bind->image),
                               cairo_image_surface_get_data (surface),
                               cairo_image_surface_get_format (surface) == CAIRO_FORMAT_ARGB32 ?
                               COGL_PIXEL_FORMAT_BGRA_8888 : COGL_PIXEL_FORMAT_BGR_888,
-                              cairo_image_surface_get_width (surface),
+                              width,
-                              cairo_image_surface_get_height (surface),
+                              height,
                               cairo_image_surface_get_stride (surface),
                               &error);
 
-      if (image)
+      if (error)
-        clutter_actor_set_content (bind->actor, image);
-      else if (error)
         g_warning ("Failed to allocate texture: %s", error->message);
-
-      clutter_actor_set_opacity (bind->actor, 255);
     }
   else
-    clutter_actor_set_opacity (bind->actor, 0);
+    bind->image = g_object_new (ST_TYPE_IMAGE_CONTENT,
+                                "preferred-width", 0, /* tough luck */
+                                "preferred-height", 0,
+                                NULL);
 }
 
 static void
@@ -798,57 +793,48 @@ st_texture_cache_free_bind (gpointer data)
 {
   StTextureCachePropertyBind *bind = data;
   if (bind->weakref_active)
-    g_object_weak_unref (G_OBJECT (bind->actor), st_texture_cache_bind_weak_notify, bind);
+    g_object_weak_unref (G_OBJECT (bind->image), st_texture_cache_bind_weak_notify, bind);
   g_slice_free (StTextureCachePropertyBind, bind);
 }
 
 /**
  * st_texture_cache_bind_cairo_surface_property:
  * @cache:
- * @object: A #GObject with a property @property_name of type #GdkPixbuf
+ * @object: A #GObject with a property @property_name of type #cairo_surface_t
  * @property_name: Name of a property
  *
- * Create a #ClutterActor which tracks the #cairo_surface_t value of a GObject property
+ * Create a #GIcon which tracks the #cairo_surface_t value of a GObject property
  * named by @property_name.  Unlike other methods in StTextureCache, the underlying
  * #CoglTexture is not shared by default with other invocations to this method.
  *
  * If the source object is destroyed, the texture will continue to show the last
  * value of the property.
  *
- * Return value: (transfer none): A new #StWidget
+ * Return value: (transfer none): A new #GIcon
  */
-StWidget *
+GIcon *
 st_texture_cache_bind_cairo_surface_property (StTextureCache    *cache,
                                               GObject           *object,
-                                              const char        *property_name,
+                                              const char        *property_name)
-                                              gint               size)
 {
-  StWidget *widget;
   gchar *notify_key;
   StTextureCachePropertyBind *bind;
 
-  widget = g_object_new (ST_TYPE_WIDGET,
-                         "opacity", 0,
-                         "width", (float)size,
-                         "height", (float)size,
-                         NULL);
-
   bind = g_slice_new0 (StTextureCachePropertyBind);
   bind->cache = cache;
-  bind->actor = CLUTTER_ACTOR (widget);
-  bind->size = size;
   bind->source = object;
-  g_object_weak_ref (G_OBJECT (widget), st_texture_cache_bind_weak_notify, bind);
-  bind->weakref_active = TRUE;
 
   st_texture_cache_reset_texture (bind, property_name);
 
+  g_object_weak_ref (G_OBJECT (bind->image), st_texture_cache_bind_weak_notify, bind);
+  bind->weakref_active = TRUE;
+
   notify_key = g_strdup_printf ("notify::%s", property_name);
   bind->notify_signal_id = g_signal_connect_data (object, notify_key, G_CALLBACK(st_texture_cache_on_pixbuf_notify),
                                                   bind, (GClosureNotify)st_texture_cache_free_bind, 0);
   g_free (notify_key);
 
-  return widget;
+  return G_ICON (bind->image);
 }
 
 /**

src/st/st-texture-cache.h

@@ -64,10 +64,9 @@ st_texture_cache_load_sliced_image (StTextureCache *cache,
                                     GFunc           load_callback,
                                     gpointer        user_data);
 
-StWidget *st_texture_cache_bind_cairo_surface_property (StTextureCache    *cache,
+GIcon *st_texture_cache_bind_cairo_surface_property (StTextureCache    *cache,
-                                                        GObject           *object,
+                                                     GObject           *object,
-                                                        const char        *property_name,
+                                                     const char *property_name);
-                                                        gint               size);
 
 ClutterActor *st_texture_cache_load_gicon (StTextureCache *cache,
                                            StThemeNode    *theme_node,