[gtk+/wip/matthiasc/gsk-renderer] container: Prepare to prune render nodes

[Matthias Clasen <matthiasc src gnome org>]

commit 01ea2fcd233dc989d5c6392c7d0f80bd7b132c5e
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Aug 16 12:19:48 2016 -0400

    container: Prepare to prune render nodes
    
    Add a should_propagate function for render nodes. Eventually,
    this is meant to avoid creating render nodes for child widgets
    that are outside the parents clip area. Since we don't have
    that information available right now, just filter out nondrawable
    children for now.

 gtk/gtkcontainer.c |   15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcontainer.c b/gtk/gtkcontainer.c
index 429348f..21d8e89 100644
--- a/gtk/gtkcontainer.c
+++ b/gtk/gtkcontainer.c
@@ -3886,6 +3886,16 @@ typedef struct {
   GArray *child_infos;
 } RenderData;
 
+static gboolean
+should_propagate_node (GtkWidget  *child,
+                       RenderData *data)
+{
+  if (!_gtk_widget_is_drawable (child))
+    return FALSE;
+
+  return TRUE;
+}
+
 static void
 propagate_render_node (GtkWidget *child,
                        gpointer   data_)
@@ -3954,6 +3964,9 @@ collect_child_infos (GtkWidget *widget,
   GList *siblings;
   GdkWindow *window;
 
+  if (!should_propagate_node (widget, data))
+    return;
+
   info.child = widget;
   info.window_depth = G_MAXINT;
 
@@ -3970,7 +3983,6 @@ collect_child_infos (GtkWidget *widget,
   g_array_append_val (data->child_infos, info);
 }
 
-
 void
 gtk_container_propagate_render_node (GtkContainer  *container,
                                      GskRenderer   *renderer,
@@ -3982,6 +3994,7 @@ gtk_container_propagate_render_node (GtkContainer  *container,
   data.container = container;
   data.renderer = renderer;
   data.parent = parent_node;
+
   data.child_infos = g_array_new (FALSE, TRUE, sizeof (ChildOrderInfo));
 
   gtk_container_forall (container, collect_child_infos, &data);