/*
- * Copyright (c) 2001-2002, David Janssens
+ * Copyright (c) 2001-2003, David Janssens
+ * Copyright (c) 2002-2003, Yannick Verschueren
+ * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
+ * Copyright (c) 2005, Hervé Drolon, FreeImage Team
+ * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
-
-
#ifndef __FIX_H
#define __FIX_H
-int fix_mul(int a, int b);
-
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+#define int64 __int64
+#else
+#define int64 long long
#endif
+
+/**
+@file fix.h
+@brief Implementation of operations of specific multiplication (FIX)
+
+The functions in FIX.H have for goal to realize specific multiplication.
+*/
+
+/** @defgroup FIX FIX - Implementation of operations of specific multiplication */
+/*@{*/
+
+/**
+Multiply two fixed-precision rational numbers.
+@param a
+@param b
+@return Returns a * b
+*/
+static INLINE int fix_mul(int a, int b) {
+ int64 temp = (int64) a * (int64) b >> 12;
+ return (int) ((temp >> 1) + (temp & 1)) ;
+}
+
+/*@}*/
+
+#endif /* __FIX_H */