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, 4 insertions, 2 deletions

diff --git a/source/blender/makesdna/DNA_space_types.h b/source/blender/makesdna/DNA_space_types.h
index 49a4df043fb..90961a5cc15 100644
--- a/source/blender/makesdna/DNA_space_types.h
+++ b/source/blender/makesdna/DNA_space_types.h
@@ -396,8 +396,9 @@ typedef struct SpaceNode {
 	float mx, my;		/* mousepos for drawing socketless link */
 	
 	struct bNodeTree *nodetree, *edittree;
-	int treetype;			/* treetype: as same nodetree->type */
-	short texfrom, pad;		/* texfrom object, world or brush */
+	int treetype;		/* treetype: as same nodetree->type */
+	short texfrom;		/* texfrom object, world or brush */
+	short recalc;		/* currently on 0/1, for auto compo */
 	
 	struct bGPdata *gpd;		/* grease-pencil data */
 } SpaceNode;
@@ -407,6 +408,7 @@ typedef struct SpaceNode {
 #define SNODE_DISPGP		4
 #define SNODE_USE_ALPHA		8
 #define SNODE_SHOW_ALPHA	16
+#define SNODE_AUTO_RENDER	32
 
 /* snode->texfrom */
 #define SNODE_TEX_OBJECT	0