libfreerdp-rfx: fix DWT mirror lifting.

diff --git a/libfreerdp-rfx/rfx_dwt.c b/libfreerdp-rfx/rfx_dwt.c
index 4489804..e870b18 100644 (file)
--- a/libfreerdp-rfx/rfx_dwt.c
+++ b/libfreerdp-rfx/rfx_dwt.c
@@ -133,7 +133,7 @@ static void rfx_dwt_2d_encode_block(sint16* buffer, sint16* dwt, int subband_wid
                        src = buffer + y * total_width + x;
 
                        /* H */
-                       *h = (src[total_width] - ((src[0] + src[n < subband_width - 1 ? 2 * total_width : total_width]) >> 1)) >> 1;
+                       *h = (src[total_width] - ((src[0] + src[n < subband_width - 1 ? 2 * total_width : 0]) >> 1)) >> 1;
 
                        /* L */
                        *l = src[0] + (n == 0 ? *h : (*(h - total_width) + *h) >> 1);