#include <ggi/ggi.h>
int ggiDrawPixel(ggi_visual_t vis, int x, int y);
int ggiDrawPixel
int ggiPutPixel(ggi_visual_t vis, int x, int y, ggi_pixel col);
int ggiPutPixel
int ggiGetPixel(ggi_visual_t vis, int x, int y, ggi_pixel *col);
int ggiGetPixel
Draw, put, or get a single pixelvalue at (x,y).
All three functions return 0 to indicate success. Any other value indicates an error.