refactor node highlight code. New implementation will not write to

uninitialized memory. it happened when you delete a node that was being
executed. in the compostor

source/blender/compositor/COM_compositor.h

@@ -299,6 +299,19 @@ extern "C" {
  */
 void COM_execute(RenderData* rd, bNodeTree *editingtree, int rendering);
 
+/**
+ * @brief Return a list of highlighted bnodes pointers.
+ * @return 
+ */
+void COM_startReadHighlights();
+
+/**
+ * @brief check if a bnode is highlighted
+ * @param bnode
+ * @return 
+ */
+int COM_isHighlightedbNode(bNode* bnode);
+
 #ifdef __cplusplus
 }
 #endif

source/blender/compositor/intern/COM_WorkScheduler.cpp

@@ -66,6 +66,12 @@ static bool g_openclActive = false;
 #endif
 #endif
 
+#define MAX_HIGHLIGHT 8
+extern "C" {
+int g_highlightIndex;
+void ** g_highlightedNodes;
+void ** g_highlightedNodesRead;
+
 #define HIGHLIGHT(wp) \
 { \
 	ExecutionGroup* group = wp->getExecutionGroup(); \
@@ -77,14 +83,38 @@ static bool g_openclActive = false;
 			bNode *node = complexOperation->getbNode(); \
 			if (node) { \
 				if (node->original) { \
-					node->original->highlight = 1;\
-				} else {\
-					node->highlight = 1; \
+					node = node->original;\
+				}\
+				if (g_highlightIndex < MAX_HIGHLIGHT) {\
+					g_highlightedNodes[g_highlightIndex++] = node;\
 				}\
 			} \
 		} \
 	} \
 }
+void COM_startReadHighlights() {
+	if (g_highlightedNodesRead) {
+		delete g_highlightedNodesRead;
+	}
+	
+	g_highlightedNodesRead = g_highlightedNodes;
+	g_highlightedNodes = new void*[MAX_HIGHLIGHT];
+	g_highlightIndex = 0;
+	for (int i = 0 ; i < MAX_HIGHLIGHT; i++) {
+		g_highlightedNodes[i] = 0;
+	}
+}
+
+int COM_isHighlightedbNode(bNode* bnode) {
+	if (!g_highlightedNodesRead) return false;
+	for (int i = 0 ; i < MAX_HIGHLIGHT; i++) {
+		void* p = g_highlightedNodesRead[i];
+		if (!p) return false;
+		if (p == bnode) return true;
+	}
+	return false;
+}
+} // end extern "C"
 
 #if COM_CURRENT_THREADING_MODEL == COM_TM_QUEUE
 void *WorkScheduler::thread_execute_cpu(void *data)
@@ -219,6 +249,9 @@ extern void clContextError(const char *errinfo, const void *private_info, size_t
 
 void WorkScheduler::initialize()
 {
+	g_highlightedNodesRead = 0;
+	g_highlightedNodes = 0;
+	COM_startReadHighlights();
 #if COM_CURRENT_THREADING_MODEL == COM_TM_QUEUE
 	int numberOfCPUThreads = BLI_system_thread_count();
 
@@ -313,3 +346,4 @@ void WorkScheduler::deinitialize()
 #endif
 #endif
 }
+

source/blender/editors/space_node/CMakeLists.txt

@@ -31,6 +31,7 @@ set(INC
 	../../nodes
 	../../render/extern/include
 	../../windowmanager
+	../../compositor
 	../../../../intern/guardedalloc
 	../../../../intern/opennl/extern
 )

source/blender/editors/space_node/SConscript

@@ -4,7 +4,7 @@ Import ('env')
 sources = env.Glob('*.c')
 
 incs = '../include ../../blenfont ../../blenlib ../../blenkernel ../../makesdna ../../makesrna ../../imbuf'
-incs += ' ../../nodes ../../render/extern/include ../../blenloader ../../gpu'
+incs += ' ../../nodes ../../render/extern/include ../../blenloader ../../gpu ../../compositor'
 incs += ' ../../windowmanager #intern/guardedalloc #extern/glew/include'
 defs = []
 cf = []

source/blender/editors/space_node/node_draw.c

@@ -80,6 +80,7 @@
 #include "intern/node_util.h"
 
 #include "node_intern.h"
+#include "COM_compositor.h"
 
 /* width of socket columns in group display */
 #define NODE_GROUP_FRAME  120
@@ -726,9 +727,8 @@ static void node_draw_basis(const bContext *C, ARegion *ar, SpaceNode *snode, bN
 		UI_ThemeColorBlend(color_id, TH_REDALERT, 0.5f);
 
 	if (ntree->type == NTREE_COMPOSIT && (snode->flag & SNODE_SHOW_HIGHLIGHT)) {
-		if (node->highlight) {
+		if (COM_isHighlightedbNode(node)) {
 			UI_ThemeColorBlend(color_id, TH_ACTIVE, 0.5f);
-			node->highlight = 0;
 		}
 	}
 	uiSetRoundBox(UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT);
@@ -893,9 +893,8 @@ static void node_draw_hidden(const bContext *C, ARegion *ar, SpaceNode *snode, b
 		UI_ThemeColorBlend(color_id, TH_REDALERT, 0.5f);
 
 	if (ntree->type == NTREE_COMPOSIT && (snode->flag & SNODE_SHOW_HIGHLIGHT)) {
-		if (node->highlight) {
+		if (COM_isHighlightedbNode(node)) {
 			UI_ThemeColorBlend(color_id, TH_ACTIVE, 0.5f);
-			node->highlight = 0;
 		}
 	}
 	
@@ -1133,6 +1132,7 @@ void drawnodespace(const bContext *C, ARegion *ar, View2D *v2d)
 	
 	if (snode->nodetree) {
 		bNode *node;
+		void** highlights = 0;
 		
 		node_uiblocks_init(C, snode->nodetree);
 		
@@ -1145,6 +1145,9 @@ void drawnodespace(const bContext *C, ARegion *ar, View2D *v2d)
 		}
 		
 		node_update_nodetree(C, snode->nodetree, 0.0f, 0.0f);
+		if (snode->nodetree->type == NTREE_COMPOSIT) {
+			COM_startReadHighlights();
+		} 
 		node_draw_nodetree(C, ar, snode, snode->nodetree);
 		
 		#if 0

source/blender/makesdna/DNA_node_types.h

@@ -178,9 +178,7 @@ typedef struct bNode {
 	char label[64];			/* custom user-defined label, MAX_NAME */
 	short custom1, custom2;	/* to be abused for buttons */
 	float custom3, custom4;
-	int highlight;			/* 0 = not highlighted, 1-N = highlighted*/
-	int pad;
-	
+
 	short need_exec, exec;	/* need_exec is set as UI execution event, exec is flag during exec */
 	void *threaddata;		/* optional extra storage for use in thread (read only then!) */
 	rctf totr;				/* entire boundbox */

source/blender/nodes/composite/node_composite_tree.c

@@ -61,7 +61,7 @@
 #include "node_composite_util.h"
 
 #ifdef WITH_COMPOSITOR
-#  include "COM_compositor.h"
+	#include "COM_compositor.h"
 #endif
 
 static void foreach_nodetree(Main *main, void *calldata, bNodeTreeCallback func)