man putpixel (3): Writes a pixel into a bitmap. Allegro game programming library.

putpixel(3) Writes a pixel into a bitmap. Allegro game programming library.

SYNOPSIS

#include <allegro.h>

void putpixel(BITMAP *bmp, int x, int y, int color);

Writes a pixel to the specified position in the bitmap, using the current drawing mode and the bitmap's clipping rectangle. Example:

   putpixel(screen, 10, 30, some_color);