fix16.h: provide fix16_from-like compile-time macros

1 files changed, 6 insertions, 0 deletions

diff --git a/libfixmath/fixmath/fix16.h b/libfixmath/fixmath/fix16.h
index a2a49b1..d5acb81 100755
--- a/libfixmath/fixmath/fix16.h
+++ b/libfixmath/fixmath/fix16.h
@@ -42,6 +42,12 @@ static inline fix16_t fix16_from_int(int a) { return a * fix16_one; }
 static inline float fix16_to_float(fix16_t a) { return (float)a / fix16_one; }

 static inline double fix16_to_dbl(fix16_t a) { return (double)a / fix16_one; }

 

+/* Static inline functions cannot be used to determine compile-time values,

+ * so use this expression instead if needed. */

+#define FIX16_C_FROM_INT(a) ((a) * fix16_one)

+#define FIX16_C_FROM_FLOAT(a) (((float)(a) * fix16_one) >= 0 ? \

+    (((float)(a) * fix16_one)) + 0.5f : ((float)(a) * fix16_one) - 0.5f)

+

 static inline int fix16_to_int(fix16_t a)

 {

 #ifdef FIXMATH_NO_ROUNDING