[mutter/gbsneto/content-part2: 2/4] window-content: Track subsurfaces invalidations

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit df2adce2f57e3e86072358007c94c255367ffe72
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Dec 27 23:30:20 2018 -0200

    window-content: Track subsurfaces invalidations
    
    WIP
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/861

 src/compositor/meta-shaped-texture-private.h |  8 ++++
 src/compositor/meta-shaped-texture.c         | 36 ++++++++++++++++
 src/compositor/meta-window-content.c         | 64 ++++++++++++++++++++++++++++
 3 files changed, 108 insertions(+)
---
diff --git a/src/compositor/meta-shaped-texture-private.h b/src/compositor/meta-shaped-texture-private.h
index 87527e884..e39bc9502 100644
--- a/src/compositor/meta-shaped-texture-private.h
+++ b/src/compositor/meta-shaped-texture-private.h
@@ -68,4 +68,12 @@ void meta_shaped_texture_paint_node (MetaShapedTexture *stex,
                                      ClutterActorBox   *box,
                                      guchar             opacity);
 
+typedef void (*MetaShapedTextureInvalidateFunc) (MetaShapedTexture *stex,
+                                                 gboolean           size_changed,
+                                                 gpointer           user_data);
+
+void meta_shaped_texture_set_invalidate_func (MetaShapedTexture               *stex,
+                                              MetaShapedTextureInvalidateFunc  func,
+                                              gpointer                         user_data);
+
 #endif
diff --git a/src/compositor/meta-shaped-texture.c b/src/compositor/meta-shaped-texture.c
index 29b70cfb0..e7b76ca8d 100644
--- a/src/compositor/meta-shaped-texture.c
+++ b/src/compositor/meta-shaped-texture.c
@@ -107,6 +107,9 @@ struct _MetaShapedTexture
 
   int buffer_scale;
 
+  MetaShapedTextureInvalidateFunc invalidate_func;
+  gpointer invalidate_user_data;
+
   guint create_mipmaps : 1;
 };
 
@@ -774,11 +777,35 @@ meta_shaped_texture_get_preferred_size (ClutterContent *content,
   return TRUE;
 }
 
+static void
+meta_shaped_texture_invalidate (ClutterContent *content)
+{
+  MetaShapedTexture *stex = META_SHAPED_TEXTURE (content);
+
+  if (!stex->invalidate_func)
+    return;
+
+  stex->invalidate_func (stex, FALSE, stex->invalidate_user_data);
+}
+
+static void
+meta_shaped_texture_invalidate_size (ClutterContent *content)
+{
+  MetaShapedTexture *stex = META_SHAPED_TEXTURE (content);
+
+  if (!stex->invalidate_func)
+    return;
+
+  stex->invalidate_func (stex, TRUE, stex->invalidate_user_data);
+}
+
 static void
 clutter_content_iface_init (ClutterContentInterface *iface)
 {
   iface->paint_content = meta_shaped_texture_paint_content;
   iface->get_preferred_size = meta_shaped_texture_get_preferred_size;
+  iface->invalidate = meta_shaped_texture_invalidate;
+  iface->invalidate_size = meta_shaped_texture_invalidate_size;
 }
 
 void
@@ -1445,3 +1472,12 @@ meta_shaped_texture_paint_node (MetaShapedTexture *stex,
 
   do_paint_content (stex, root_node, stex->texture, box, opacity);
 }
+
+void
+meta_shaped_texture_set_invalidate_func (MetaShapedTexture               *stex,
+                                         MetaShapedTextureInvalidateFunc  func,
+                                         gpointer                         user_data)
+{
+  stex->invalidate_func = func;
+  stex->invalidate_user_data = user_data;
+}
diff --git a/src/compositor/meta-window-content.c b/src/compositor/meta-window-content.c
index cd41b0e52..5632a84a1 100644
--- a/src/compositor/meta-window-content.c
+++ b/src/compositor/meta-window-content.c
@@ -82,6 +82,53 @@ enum
 
 static GParamSpec *properties [N_PROPS];
 
+static void
+texture_invalidate_func (MetaShapedTexture *stex,
+                         gboolean           size_changed,
+                         gpointer           user_data)
+{
+  MetaWindowContent *window_content = (MetaWindowContent*) user_data;
+
+  if (window_content->attached_actors == 0)
+    return;
+
+  if (size_changed)
+    clutter_content_invalidate_size (CLUTTER_CONTENT (user_data));
+  else
+    clutter_content_invalidate (CLUTTER_CONTENT (user_data));
+}
+
+static void
+set_surface_invalidate_func (MetaWindowContent               *window_content,
+                             MetaShapedTextureInvalidateFunc  func)
+{
+  ClutterActor *window_actor = CLUTTER_ACTOR (window_content->window_actor);
+  ClutterActor *child;
+
+  for (child = clutter_actor_get_first_child (window_actor);
+       child != NULL;
+       child = clutter_actor_get_next_sibling (child))
+    {
+      MetaShapedTexture *stex;
+
+      if (!META_IS_SURFACE_ACTOR (child))
+        continue;
+
+      stex = meta_surface_actor_get_texture (META_SURFACE_ACTOR (child));
+
+      if (!stex)
+        continue;
+
+      meta_shaped_texture_set_invalidate_func (stex, func, window_content);
+    }
+}
+
+static void
+ensure_shaped_textures_invalidate_func (MetaWindowContent *window_content)
+{
+  set_surface_invalidate_func (window_content, texture_invalidate_func);
+}
+
 static void
 add_surface_paint_nodes (MetaSurfaceActor *surface_actor,
                          ClutterActor     *actor,
@@ -136,6 +183,8 @@ meta_window_content_paint_content (ClutterContent   *content,
   g_assert (!META_IS_WINDOW_ACTOR (actor));
   g_assert (!META_IS_SURFACE_ACTOR (actor));
 
+  ensure_shaped_textures_invalidate_func (window_content);
+
   /* Horizontal and vertical scales */
   clutter_actor_get_size (window_actor, &width, &height);
   clutter_actor_get_size (actor, &dst_width, &dst_height);
@@ -162,6 +211,8 @@ meta_window_content_get_preferred_size (ClutterContent *content,
 {
   MetaWindowContent *window_content = META_WINDOW_CONTENT (content);
 
+  ensure_shaped_textures_invalidate_func (window_content);
+
   clutter_actor_get_size (CLUTTER_ACTOR (window_content->window_actor),
                           width, height);
   return TRUE;
@@ -174,6 +225,8 @@ meta_window_content_attached (ClutterContent *content,
   MetaWindowContent *window_content = META_WINDOW_CONTENT (content);
 
   window_content->attached_actors++;
+
+  ensure_shaped_textures_invalidate_func (window_content);
 }
 
 static void
@@ -235,11 +288,22 @@ meta_window_content_set_property (GObject      *object,
     }
 }
 
+static void
+meta_window_content_dispose (GObject *object)
+{
+  MetaWindowContent *window_content = META_WINDOW_CONTENT (object);
+
+  set_surface_invalidate_func (window_content, surface_actor, NULL);
+
+  G_OBJECT_CLASS (meta_window_content_parent_class)->dispose (object);
+}
+
 static void
 meta_window_content_class_init (MetaWindowContentClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
+  object_class->dispose = meta_window_content_dispose;
   object_class->get_property = meta_window_content_get_property;
   object_class->set_property = meta_window_content_set_property;