NAME
excolmap - Creating graphical effects with color mapping tables.
Allegro game programming library.
SYNOPSIS
#include <allegro.h>
Example excolmap
DESCRIPTION
This program demonstrates how to create custom graphic effects with the
create_color_table function. Allegro drawing routines are affected by
any color table you might have set up. In the first part of this
example, a greyscale color table is set. The result is that a simple
rectfill call, instead of drawing a rectangle with color zero, uses the
already drawn pixels to determine the pixel to be drawn (read the
comment of return_grey_color() for a precise description of the
algorithm). In the second part of the test, the color table is changed
to be an inverse table, meaning that any pixel drawn will be shown as
its color values had been inverted.
SEE ALSO
BITMAP(3alleg), COLOR_MAP(3alleg), END_OF_MAIN(3alleg),
PALETTE(3alleg), RGB(3alleg), RGB_MAP(3alleg), SCREEN_H(3alleg),
SCREEN_W(3alleg), allegro_error(3alleg), allegro_init(3alleg),
allegro_message(3alleg), blit(3alleg), circlefill(3alleg),
clear_keybuf(3alleg), color_map(3alleg), create_bitmap(3alleg),
create_color_table(3alleg), create_rgb_table(3alleg),
destroy_bitmap(3alleg), drawing_mode(3alleg), font(3alleg),
generate_332_palette(3alleg), install_keyboard(3alleg),
keypressed(3alleg), makecol(3alleg), rectfill(3alleg), rgb_map(3alleg),
screen(3alleg), set_gfx_mode(3alleg), set_palette(3alleg),
textout_centre_ex(3alleg), vsync(3alleg)