transform: fix off-by-one (fixes #10505)

diff --git a/modules/video_filter/transform.c b/modules/video_filter/transform.c
index d36de8d941d86b2934c8d19d4872fe8018edb827..b9d5ffcf85044a69cf957722eebfed99cc27a208 100644 (file)
--- a/modules/video_filter/transform.c
+++ b/modules/video_filter/transform.c
@@ -102,8 +102,8 @@ static void R90(int *sx, int *sy, int w, int h, int dx, int dy)
 }
 static void R180(int *sx, int *sy, int w, int h, int dx, int dy)
 {
-    *sx = w - dx;
-    *sy = h - dy;
+    *sx = w - 1 - dx;
+    *sy = h - 1 - dy;
 }
 static void R270(int *sx, int *sy, int w, int h, int dx, int dy)
 {