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/nodes/composite/nodes/node_composite_keyingscreen.c b/source/blender/nodes/composite/nodes/node_composite_keyingscreen.c
index e16b7e5d885..96e905827cb 100644
--- a/source/blender/nodes/composite/nodes/node_composite_keyingscreen.c
+++ b/source/blender/nodes/composite/nodes/node_composite_keyingscreen.c
@@ -96,21 +96,24 @@ static void compute_gradient_screen(RenderData *rd, NodeKeyingScreenData *keying
 		int j;
 
 		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] = marker->pos[0] * screenbuf->x;
 		site->co[1] = marker->pos[1] * screenbuf->y;