X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=lib%2Fgfxpoly%2Fconvert.c;h=dae58b6c6932272aaaec9eca73e6a6141c7c1414;hb=6ff87df3f198989c39e4adca06e0e92069a29edd;hp=9d8ecab32508ab806916ff7aab4880d2eb4a13b1;hpb=be6d3cbb485c5f7e9dd6fe22bf54245c79b10b71;p=swftools.git

diff --git a/lib/gfxpoly/convert.c b/lib/gfxpoly/convert.c
index 9d8ecab..dae58b6 100644
--- a/lib/gfxpoly/convert.c
+++ b/lib/gfxpoly/convert.c
@@ -12,12 +12,13 @@
 
 static inline int32_t convert_coord(double x, double z)
 {
-    /* we clamp to 31 bit instead of 32 bit because we use
-       a (x1-x2) shortcut when comparing coordinates
+    /* we clamp to 26 bit because: 
+       a) we use a (x1-x2) shortcut when comparing coordinates
+       b) we need to be able to multiply two coordinates and store them in a double w/o loss of precision
     */
     x *= z;
-    if(x < -0x40000000) x = -0x40000000;
-    if(x >  0x3fffffff) x =  0x3fffffff;
+    if(x < -0x2000000) x = -0x2000000;
+    if(x >  0x1ffffff) x =  0x1ffffff;
     return ceil(x);
 }