/* Simple XCB application drawing a box in a window */
#include <xcb/xcb.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
xcb_connection_t *c;
xcb_screen_t *s;
xcb_window_t w;
xcb_gcontext_t g;
xcb_generic_event_t *e;
uint32_t mask;
uint32_t values[2];
int done = 0;
xcb_rectangle_t r = { 20, 20, 60, 60 };
/* open connection with the server */
c = xcb_connect(NULL,NULL);
if (xcb_connection_has_error(c)) {
printf("Cannot open display\n");
exit(1);
}
/* get the first screen */
s = xcb_setup_roots_iterator( xcb_get_setup(c) ).data;
/* create black graphics context */
g = xcb_generate_id(c);
w = s->root;
mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
values[0] = s->black_pixel;
values[1] = 0;
xcb_create_gc(c, g, w, mask, values);
/* create window */
w = xcb_generate_id(c);
mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
values[0] = s->white_pixel;
values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS;
xcb_create_window(c, s->root_depth, w, s->root,
10, 10, 100, 100, 1,
XCB_WINDOW_CLASS_INPUT_OUTPUT, s->root_visual,
mask, values);
/* map (show) the window */
xcb_map_window(c, w);
xcb_flush(c);
/* event loop */
while (!done && (e = xcb_wait_for_event(c))) {
switch (e->response_type & ~0x80) {
case XCB_EXPOSE: /* draw or redraw the window */
xcb_poly_fill_rectangle(c, w, g, 1, &r);
xcb_flush(c);
break;
case XCB_KEY_PRESS: /* exit on key press */
done = 1;
break;
}
free(e);
}
/* close connection to server */
xcb_disconnect(c);
return 0;
}
