FreeBSD Manual Pages
al_fixmul(3) Library Functions Manual al_fixmul(3) NAME al_fixmul - Allegro 5 API SYNOPSIS #include <allegro5/allegro.h> al_fixed al_fixmul(al_fixed x, al_fixed y); DESCRIPTION A fixed point value can be multiplied or divided by an integer with the normal * and / operators. To multiply two fixed point values, though, you must use this function. If an overflow occurs, Allegro's errno will be set and the maximum pos- sible value will be returned, but errno is not cleared if the operation is successful. This means that if you are going to test for overflow you should call al_set_errno(0) before calling al_fixmul(3). Example: al_fixed result; /* This will put 30000 into `result'. */ result = al_fixmul(al_itofix(10), al_itofix(3000)); /* But this overflows, and sets errno. */ result = al_fixmul(al_itofix(100), al_itofix(3000)); assert(!al_get_errno()); RETURN VALUE Returns the clamped result of multiplying x by y, setting Allegro's er- rno to ERANGE if there was an overflow. SEE ALSO al_fixadd(3), al_fixsub(3), al_fixdiv(3), al_get_errno(3). Allegro reference manual al_fixmul(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=al_fixmul&sektion=3&manpath=FreeBSD+Ports+14.3.quarterly>