ftofix (3) - Linux Manuals

ftofix: Converts a floating point value to fixed point. Allegro game programming library.

NAME

ftofix - Converts a floating point value to fixed point. Allegro game programming library.

SYNOPSIS

#include <allegro.h>

fixed ftofix(double x);

DESCRIPTION

Converts a floating point value to fixed point. Unlike itofix(), this function clamps values which could overflow the type conversion, setting `errno' to ERANGE in the process if this happens. Example:

   fixed number;
   number = itofix(-40000);
   ASSERT(fixfloor(number) == -32768);
   number = itofix(64000);
   ASSERT(fixfloor(number) == 32767);
   ASSERT(!errno); /* This will fail. */

RETURN VALUE

Returns the value of the floating point value converted to fixed point clamping overflows (and setting `errno').