fade_in_range - Gradually fades a part of the palette from black. Allegro game programming library.

       Gradually  fades  a part of the palette from a black screen to the specified palette. The speed is from 1
       (the slowest) up to 64 (instantaneous). This routine only affects colors between from and to  (inclusive:
       pass 0 and 255 to fade the entire palette).

       Note  that  this  function  will  block  your  game  while the fade is in effect, and it won't work right
       visually if you are not in an 8 bit color depth resolution.

       fade_in_range - Gradually fades a part of the palette from black. Allegro game programming library.

fade_in(3alleg4)

Allegro                                           version 4.4.3                           fade_in_range(3alleg4)

#include<allegro.h>voidfade_in_range(constPALETTEp,intspeed,intfrom,intto);