draw_character_ex - Draws non transparent pixels of the sprite with a color.
Allegro game programming library.
void draw_character_ex(BITMAP *bmp, BITMAP *sprite, int x, int
y, color, bg);
Draws a copy of the sprite bitmap onto the destination bitmap at the specified
position, drawing transparent pixels in the background color (or skipping them
if the background color is -1) and setting all other pixels to the specified
color. Transparent pixels are marked by a zero in 256-color modes or bright
pink for truecolor data (maximum red and blue, zero green). The sprite must be
an 8-bit image, even if the destination is a truecolor bitmap. Example:
/* Draw the logo silhouette in red. */
draw_character_ex(screen, logo, SCREEN_W / 2, SCREEN_H / 2,
makecol(255, 0, 0), -1);