/* Simple XCB application drawing a box in a window */
#include<xcb/xcb.h>
#include<stdio.h>
#include<stdlib.h>
intmain()
{
xcb_connection_t*c;
xcb_screen_t*s;
xcb_window_tw;
xcb_gcontext_tg;
xcb_generic_event_t*e;
uint32_tmask;
uint32_tvalues[2];
intdone=0;
xcb_rectangle_tr={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){
caseXCB_EXPOSE:/* draw or redraw the window */
xcb_poly_fill_rectangle(c,w,g,1,&r);
xcb_flush(c);
break;
caseXCB_KEY_PRESS:/* exit on key press */
done=1;
break;
}
free(e);
}
/* close connection to server */
xcb_disconnect(c);
return0;
}
