--- colorspace.c	2005/11/22 10:23:01	1.11
+++ colorspace.c	2006/10/30 10:52:00	1.13
@@ -19,7 +19,7 @@
  *  along with this program ; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  *
- * $Id: colorspace.c,v 1.11 2005/11/22 10:23:01 suxen_drol Exp $
+ * $Id: colorspace.c,v 1.13 2006/10/30 10:52:00 Skal Exp $
  *
  ****************************************************************************/
 
@@ -472,11 +472,14 @@
 	int width2 = width / 2;
 	int height2 = height / 2;
 	int y;
+	const int with_uv = (u_src!=0 && v_src!=0);
 
 	if (vflip) {
 		y_src += (height - 1) * y_src_stride;
-		u_src += (height2 - 1) * uv_src_stride;
-		v_src += (height2 - 1) * uv_src_stride;
+		if (with_uv) {
+			u_src += (height2 - 1) * uv_src_stride;
+			v_src += (height2 - 1) * uv_src_stride;
+		}
 		y_src_stride = -y_src_stride;
 		uv_src_stride = -uv_src_stride;
 	}
@@ -487,16 +490,23 @@
 		y_dst += y_dst_stride;
 	}
 
-	for (y = height2; y; y--) {
-		memcpy(u_dst, u_src, width2);
-		u_src += uv_src_stride;
-		u_dst += uv_dst_stride;
+	if (with_uv) {
+		for (y = height2; y; y--) {
+			memcpy(u_dst, u_src, width2);
+			memcpy(v_dst, v_src, width2);
+			u_src += uv_src_stride;
+			u_dst += uv_dst_stride;
+			v_src += uv_src_stride;
+			v_dst += uv_dst_stride;
+		}
 	}
-
-	for (y = height2; y; y--) {
-		memcpy(v_dst, v_src, width2);
-		v_src += uv_src_stride;
-		v_dst += uv_dst_stride;
+	else {
+		for (y = height2; y; y--) {
+			memset(u_dst, 0x80, width2);
+			memset(v_dst, 0x80, width2);
+			u_dst += uv_dst_stride;
+			v_dst += uv_dst_stride;
+		}
 	}
 }