X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=lib%2Fgfxpoly%2Fconvert.c;h=0e458be37346bc59eebf00e5a4719e2f6e238f76;hp=e326333d1b9154735ed3282e8533497e5ddf1597;hb=f7e9e8a9616f1ecb26776369fda6807cf8821a68;hpb=47dfa706dc7d700ab587db9f8ac54999c5ffa506

diff --git a/lib/gfxpoly/convert.c b/lib/gfxpoly/convert.c
index e326333..0e458be 100644
--- a/lib/gfxpoly/convert.c
+++ b/lib/gfxpoly/convert.c
@@ -20,6 +20,18 @@ static edge_t*edge_new(int x1, int y1, int x2, int y2)
 
 static inline void gfxpoly_add_edge(gfxpoly_t*poly, double _x1, double _y1, double _x2, double _y2)
 {
+    /* we clamp to 31 bit instead of 32 bit because we use
+       a (x1-x2) shortcut when comparing coordinates
+    */
+    if(_x1 < -0x40000000) _x1 = -0x40000000;
+    if(_x1 >  0x3fffffff) _x1 =  0x3fffffff;
+    if(_y1 < -0x40000000) _y1 = -0x40000000;
+    if(_y1 >  0x3fffffff) _y1 =  0x3fffffff;
+    if(_x2 < -0x40000000) _x2 = -0x40000000;
+    if(_x2 >  0x3fffffff) _x2 =  0x3fffffff;
+    if(_y2 < -0x40000000) _y2 = -0x40000000;
+    if(_y2 >  0x3fffffff) _y2 =  0x3fffffff;
+
     int x1 = ceil(_x1);
     int y1 = ceil(_y1);
     int x2 = ceil(_x2);