lavfi/delogo: Fix sign extension issue

Coverity complains about a possible sign extension issue in
apply_delogo(). While it is extremely unlikely to happen, it is easy
to fix so let's just do that. Using unsigned variables even makes the
binary code smaller.

Fixes Coverity CID 1046439.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

diff --git a/libavfilter/vf_delogo.c b/libavfilter/vf_delogo.c
index 8356c61..45a29cf 100644 (file)
--- a/libavfilter/vf_delogo.c
+++ b/libavfilter/vf_delogo.c
@@ -58,9 +58,9 @@ static void apply_delogo(uint8_t *dst, int dst_linesize,
                          uint8_t *src, int src_linesize,
                          int w, int h, AVRational sar,
                          int logo_x, int logo_y, int logo_w, int logo_h,
-                         int band, int show, int direct)
+                         unsigned int band, int show, int direct)
 {
-    int x, y, dist;
+    int x, y;
     uint64_t interp, weightl, weightr, weightt, weightb;
     uint8_t *xdst, *xsrc;
 
@@ -125,7 +125,8 @@ static void apply_delogo(uint8_t *dst, int dst_linesize,
                 x >= logo_x+band && x < logo_x+logo_w-band) {
                 *xdst = interp;
             } else {
-                dist = 0;
+                unsigned dist = 0;
+
                 if      (x < logo_x+band)
                     dist = FFMAX(dist, logo_x-x+band);
                 else if (x >= logo_x+logo_w-band)