Fix a very old crash in the box blur filter that occurred when the image

was broader than tall.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3402 92316355-f0b4-4df1-b90c-862c8a59935f

pipi/filter/blur.c

@@ -281,14 +281,14 @@ static pipi_image_t *T(boxblur)(pipi_image_t *src, int m, int n)
 
             u = y - n;
             if(FLAG_WRAP)
-                u2 = (u < 0) ? w - 1 - ((-u - 1) % w) : u % w;
+                u2 = (u < 0) ? h - 1 - ((-u - 1) % h) : u % h;
             else
-                u2 = (u < 0) ? 0 : (u >= w) ? w - 1 : u;
+                u2 = (u < 0) ? 0 : (u >= h) ? h - 1 : u;
             v = y + n + 1;
             if(FLAG_WRAP)
-                v2 = (v < 0) ? w - 1 - ((-v - 1) % w) : v % w;
+                v2 = (v < 0) ? h - 1 - ((-v - 1) % h) : v % h;
             else
-                v2 = (v < 0) ? 0 : (v >= w) ? w - 1 : v;
+                v2 = (v < 0) ? 0 : (v >= h) ? h - 1 : v;
             if(FLAG_GRAY)
             {
                 acc[x] += srcdata[v2 * w + x] - srcdata[u2 * w + x];