man gl_getpixel (Fonctions bibliothèques) - return the color of a pixel
NAME
gl_getpixel - return the color of a pixel
SYNOPSIS
#include <vgagl.h>
int gl_getpixel(int x, int y);
DESCRIPTION
Returns the color of pixel at position (x, y) in the format used in the screen memory.
The color -1 is returned for points outside the clipping window.
SEE ALSO
svgalib(7), vgagl(7), svgalib.conf(5), threedkit(7), testgl(1), gl_getbox(3), gl_getpalette(3), gl_getpalettecolor(3), gl_getpalettecolors(3), gl_getpixelrgb(3), gl_rgbcolor(3), gl_setpalette(3), gl_setpalettecolor(3), gl_setpalettecolors(3), gl_setpixel(3), gl_setpixelrgb(3).
AUTHOR
This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced demo as well as of the original documentation is unknown.
It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.
Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections to this first version of the svgalib manual.