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, 45 insertions, 0 deletions

diff --git a/source/blender/editors/space_node/node_edit.c b/source/blender/editors/space_node/node_edit.c
index 834f3483871..1279863802a 100644
--- a/source/blender/editors/space_node/node_edit.c
+++ b/source/blender/editors/space_node/node_edit.c
@@ -2158,6 +2158,51 @@ void NODE_OT_read_fullsamplelayers(wmOperatorType *ot)
 	ot->flag= 0;
 }
 
+int node_render_changed_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	Scene *sce= CTX_data_scene(C);
+	bNode *node;
+	
+	for(node= sce->nodetree->nodes.first; node; node= node->next) {
+		if(node->id==(ID *)sce && node->need_exec) {
+			break;
+		}
+	}
+	if(node) {
+		SceneRenderLayer *srl= BLI_findlink(&sce->r.layers, node->custom1);
+		
+		if(srl) {
+			PointerRNA op_ptr;
+			
+			WM_operator_properties_create(&op_ptr, "RENDER_OT_render");
+			RNA_string_set(&op_ptr, "layer", srl->name);
+			RNA_string_set(&op_ptr, "scene", sce->id.name+2);
+			
+			WM_operator_name_call(C, "RENDER_OT_render", WM_OP_INVOKE_DEFAULT, &op_ptr);
+
+			WM_operator_properties_free(&op_ptr);
+			
+			return OPERATOR_FINISHED;
+		}
+		   
+	}
+	return OPERATOR_CANCELLED;
+}
+
+void NODE_OT_render_changed(wmOperatorType *ot)
+{
+	
+	ot->name= "Render Changed Layer";
+	ot->idname= "NODE_OT_render_changed";
+	
+	ot->exec= node_render_changed_exec;
+	
+	ot->poll= composite_node_active;
+	
+	/* flags */
+	ot->flag= 0;
+}
+
 
 /* ****************** Make Group operator ******************* */