set_palette_range (3) - Linux Manuals
set_palette_range: Sets a specific range of the palette. Allegro game programming library.
NAME
set_palette_range - Sets a specific range of the palette. Allegro game programming library.SYNOPSIS
#include <allegro.h>
void set_palette_range(const PALETTE p, int from, int to, int vsync);
DESCRIPTION
Sets the palette entries between from and to (inclusive: pass 0 and 255 to set the entire palette). If vsync is set it waits for the vertical retrace, otherwise it sets the colors immediately. Example:
PALETTE palette; ... /* Modify the first 16 entries. */ change_first_16_colors(palette); /* Now update them waiting for vsync. */ set_palette_range(palette, 0, 15, 1);