Todo/feature request

When using masks or other simple 3D elements in composites, doing
a layer re-rendering on a node is a bit clumsy all the time.

This commit does two things to help:
- new hotkey "Z" in node editor automatically finds render layer
  that changed and re-renders it + composites
- option "Auto Render" does same, but then after every transform
  edit in 3D window

The latter is experimental; real & proper system for this requires
full threaded render support (like previews). But it works!

Demo file:
http://download.blender.org/demo/test/auto_composite.blend

Important fix:
After any render, all the render layers were tagged "changed", which
caused any edit to first totally recomposte everthing. Now it only
composites changes.

Implementation notes

- DAG scene flush now sets 'changed' flags in render layer nodes
- Added notifier for 'transform finished' to trigger the update,
  this is temporarily.

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/editors/space_node/node_intern.h b/source/blender/editors/space_node/node_intern.h
index 66bf9310db8..5d67eb77e28 100644
--- a/source/blender/editors/space_node/node_intern.h
+++ b/source/blender/editors/space_node/node_intern.h
@@ -92,7 +92,7 @@ void node_tree_verify_groups(bNodeTree *nodetree);
 void snode_autoconnect(SpaceNode *snode, int allow_multiple, int replace);
 int node_has_hidden_sockets(bNode *node);
 void node_set_hidden_sockets(SpaceNode *snode, bNode *node, int set);
-
+int node_render_changed_exec(bContext *, wmOperator *);
 
 void NODE_OT_duplicate(struct wmOperatorType *ot);
 void NODE_OT_delete(struct wmOperatorType *ot);
@@ -115,6 +115,7 @@ void NODE_OT_show_cyclic_dependencies(struct wmOperatorType *ot);
 void NODE_OT_link_viewer(struct wmOperatorType *ot);
 void NODE_OT_read_fullsamplelayers(struct wmOperatorType *ot);
 void NODE_OT_read_renderlayers(struct wmOperatorType *ot);
+void NODE_OT_render_changed(struct wmOperatorType *ot);
 
 void NODE_OT_backimage_move(struct wmOperatorType *ot);
 void NODE_OT_backimage_zoom(struct wmOperatorType *ot);