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#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
int main(int argc, char *argv[]) {
if (argc != 3) {
fprintf(stderr, "Usage: %s <x> <y>\n", argv[0]);
return 1;
}
int x = atoi(argv[1]);
int y = atoi(argv[2]);
Display *display = XOpenDisplay(NULL);
if (display == NULL) {
fprintf(stderr, "Unable to open display.\n");
return 1;
}
Window root = DefaultRootWindow(display);
XImage *image = XGetImage(display, root, x, y, 1, 1, AllPlanes, ZPixmap);
if (image == NULL) {
fprintf(stderr, "Unable to get image.\n");
XCloseDisplay(display);
return 1;
}
unsigned long pixel = XGetPixel(image, 0, 0);
int red = (pixel & image->red_mask) >> 16;
int green = (pixel & image->green_mask) >> 8;
int blue = (pixel & image->blue_mask);
printf("#%02x%02x%02x\n", red, green, blue);
XDestroyImage(image);
XCloseDisplay(display);
return 0;
}
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