Fix #20486: blender hangs upon import attempt of an .obj with >40k polys.

Added automatic generation of lookup_int callbacks for collections, for
quicker lookup by index instead of looping over the whole thing. Import
is still quite slow, though now it only takes a few seconds.

The next bottleneck seems to be running update (depsgraph, notifiers, ..)
on setting every property. I fixed part of that by avoiding a notifier
to be added each time, now it checks for duplicates.

1 files changed, 12 insertions, 1 deletions

diff --git a/source/blender/windowmanager/intern/wm_event_system.c b/source/blender/windowmanager/intern/wm_event_system.c
index 9ef94b5e1ff..8cfd45662ac 100644
--- a/source/blender/windowmanager/intern/wm_event_system.c
+++ b/source/blender/windowmanager/intern/wm_event_system.c
@@ -108,6 +108,17 @@ void wm_event_free_all(wmWindow *win)
 
 /* ********************* notifiers, listeners *************** */
 
+static int wm_test_duplicate_notifier(wmWindowManager *wm, unsigned int type, void *reference)
+{
+	wmNotifier *note;
+
+	for(note=wm->queue.first; note; note=note->next)
+		if((note->category|note->data|note->subtype|note->action) == type && note->reference == reference)
+			return 1;
+	
+	return 0;
+}
+
 /* XXX: in future, which notifiers to send to other windows? */
 void WM_event_add_notifier(const bContext *C, unsigned int type, void *reference)
 {
@@ -134,7 +145,7 @@ void WM_main_add_notifier(unsigned int type, void *reference)
 	Main *bmain= G.main;
 	wmWindowManager *wm= bmain->wm.first;
 
-	if(wm) {
+	if(wm && !wm_test_duplicate_notifier(wm, type, reference)) {
 		wmNotifier *note= MEM_callocN(sizeof(wmNotifier), "notifier");
 		
 		note->wm= wm;