1 files changed, 22 insertions, 4 deletions

diff --git a/source/blender/src/drawseq.c b/source/blender/src/drawseq.c
index c06108e1e16..153b304079e 100644
--- a/source/blender/src/drawseq.c
+++ b/source/blender/src/drawseq.c
@@ -825,16 +825,34 @@ void drawseqspace(ScrArea *sa, void *spacedata)
 
 	if(ed) {
 		seq= ed->seqbasep->first;
-		while(seq) {
-			if(seq->flag & SELECT); else drawseq(seq);
+		while(seq) { /* bound box test, dont draw outside the view */
+			if (seq->flag & SELECT ||
+					seq->start > G.v2d->cur.xmax ||
+					seq->start+seq->len < G.v2d->cur.xmin ||
+					seq->machine+1.0 < G.v2d->cur.ymin ||
+					seq->machine > G.v2d->cur.ymax)
+			{
+				/* dont draw */
+			} else {
+				drawseq(seq);
+			}
 			seq= seq->next;
 		}
 	}
 	ed= G.scene->ed;
 	if(ed) {
 		seq= ed->seqbasep->first;
-		while(seq) {
-			if(seq->flag & SELECT) drawseq(seq);
+		while(seq) { /* bound box test, dont draw outside the view */
+			if (!(seq->flag & SELECT) ||
+					seq->start > G.v2d->cur.xmax ||
+					seq->start+seq->len < G.v2d->cur.xmin ||
+					seq->machine+1.0 < G.v2d->cur.ymin ||
+					seq->machine > G.v2d->cur.ymax)
+			{
+				/* dont draw */
+			} else {
+				drawseq(seq);
+			}
 			seq= seq->next;
 		}
 	}