Fixed crashes when motion tracks are zero-sized

This is probably versioning issue happened when both trunk and tomato
were mixed to work on the same file.

Anyway, there're few files here locally and it's probably other users
do have the same files, so lets keep things safe here :)

1 files changed, 15 insertions, 12 deletions

diff --git a/source/blender/compositor/operations/COM_KeyingScreenOperation.cpp b/source/blender/compositor/operations/COM_KeyingScreenOperation.cpp
index c9b129d8dcf..0874e2f59be 100644
--- a/source/blender/compositor/operations/COM_KeyingScreenOperation.cpp
+++ b/source/blender/compositor/operations/COM_KeyingScreenOperation.cpp
@@ -151,21 +151,24 @@ KeyingScreenOperation::TriangulationData *KeyingScreenOperation::buildVoronoiTri
 		pattern_ibuf = BKE_tracking_get_pattern_imbuf(ibuf, track, marker, TRUE, FALSE);
 
 		zero_v3(site->color);
-		for (j = 0; j < pattern_ibuf->x * pattern_ibuf->y; j++) {
-			if (pattern_ibuf->rect_float) {
-				add_v3_v3(site->color, &pattern_ibuf->rect_float[4 * j]);
-			}
-			else {
-				unsigned char *rrgb = (unsigned char *)pattern_ibuf->rect;
 
-				site->color[0] += srgb_to_linearrgb((float)rrgb[4 * j + 0] / 255.0f);
-				site->color[1] += srgb_to_linearrgb((float)rrgb[4 * j + 1] / 255.0f);
-				site->color[2] += srgb_to_linearrgb((float)rrgb[4 * j + 2] / 255.0f);
+		if (pattern_ibuf) {
+			for (j = 0; j < pattern_ibuf->x * pattern_ibuf->y; j++) {
+				if (pattern_ibuf->rect_float) {
+					add_v3_v3(site->color, &pattern_ibuf->rect_float[4 * j]);
+				}
+				else {
+					unsigned char *rrgb = (unsigned char *)pattern_ibuf->rect;
+
+					site->color[0] += srgb_to_linearrgb((float)rrgb[4 * j + 0] / 255.0f);
+					site->color[1] += srgb_to_linearrgb((float)rrgb[4 * j + 1] / 255.0f);
+					site->color[2] += srgb_to_linearrgb((float)rrgb[4 * j + 2] / 255.0f);
+				}
 			}
-		}
 
-		mul_v3_fl(site->color, 1.0f / (pattern_ibuf->x * pattern_ibuf->y));
-		IMB_freeImBuf(pattern_ibuf);
+			mul_v3_fl(site->color, 1.0f / (pattern_ibuf->x * pattern_ibuf->y));
+			IMB_freeImBuf(pattern_ibuf);
+		}
 
 		site->co[0] = pos[0] * width;
 		site->co[1] = pos[1] * height;