X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=lib%2Fmodules%2Fswftools.c;h=37c8e8b2b11b362df2575420eed90f4f1f2a9b47;hb=e9dc83904a5df2c24cc62004be16cecdaea83797;hp=5f16339431df54bc02e1aac512df0c7bb46ab29b;hpb=1dc3d10e7596fa9b38befe04b8419103e02c492e;p=swftools.git

diff --git a/lib/modules/swftools.c b/lib/modules/swftools.c
index 5f16339..37c8e8b 100644
--- a/lib/modules/swftools.c
+++ b/lib/modules/swftools.c
@@ -26,8 +26,11 @@
 #define S64 long long
 SFIXED RFXSWF_SP(SFIXED a1,SFIXED a2,SFIXED b1,SFIXED b2)
 { S64 a;
-  a = (S64)a1*(S64)b1+(S64)a2*(S64)b2;
-  return (SFIXED)(a>>16);
+  a = ((S64)a1*(S64)b1+(S64)a2*(S64)b2)>>16;
+  SFIXED result = (SFIXED)(a);
+  if(a!=result) 
+      fprintf(stderr, "Warning: overflow in matrix multiplication");
+  return result;
 }
 SFIXED RFXSWF_QFIX(int zaehler,int nenner) // bildet Quotient von zwei INTs in SFIXED
 { S64 z = zaehler<<16;