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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <xcb/xcb_event.h>
#include <xcb/xcb_icccm.h>
#define TEST_WINDOW_IC "test\0Test"
bool get_atom(xcb_connection_t *dpy, char *name, xcb_atom_t *atom)
{
bool ret = true;
xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(dpy, xcb_intern_atom(dpy, 0, strlen(name), name), NULL);
if (reply != NULL) {
*atom = reply->atom;
} else {
ret = false;
}
free(reply);
return ret;
}
void check_request(xcb_connection_t *dpy, xcb_void_cookie_t cookie, char *msg)
{
xcb_generic_error_t *err = xcb_request_check(dpy, cookie);
if (err != NULL) {
fprintf(stderr, "%s: error code: %u.\n", msg, err->error_code);
xcb_disconnect(dpy);
exit(-1);
}
}
xcb_gc_t get_font_gc(xcb_connection_t *dpy, xcb_window_t win, const char *font_name)
{
xcb_void_cookie_t ck;
xcb_font_t font = xcb_generate_id(dpy);
ck = xcb_open_font_checked(dpy, font, strlen(font_name), font_name);
check_request(dpy, ck, "Can't open font");
xcb_gcontext_t gc = xcb_generate_id(dpy);
uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
uint32_t values[] = {0xffcccccc, 0xff111111, font};
xcb_create_gc(dpy, gc, win, mask, values);
xcb_close_font(dpy, font);
return gc;
}
void render_text(xcb_connection_t *dpy, xcb_window_t win, int16_t x, int16_t y)
{
char id[11];
xcb_void_cookie_t ck;
snprintf(id, sizeof(id), "0x%08X", win);
xcb_gcontext_t gc = get_font_gc(dpy, win, "-*-fixed-medium-*-*-*-18-*-*-*-*-*-*-*");
/* Doesn't work without _checked */
ck = xcb_image_text_8_checked(dpy, strlen(id), win, gc, x, y, id);
check_request(dpy, ck, "Can't draw text");
xcb_free_gc(dpy, gc);
}
int main(void)
{
xcb_connection_t *dpy = xcb_connect(NULL, NULL);
if (dpy == NULL) {
fprintf(stderr, "Can't connect to X.\n");
return EXIT_FAILURE;
}
xcb_atom_t WM_PROTOCOLS, WM_DELETE_WINDOW;
if (!get_atom(dpy, "WM_PROTOCOLS", &WM_PROTOCOLS) ||
!get_atom(dpy, "WM_DELETE_WINDOW", &WM_DELETE_WINDOW)) {
fprintf(stderr, "Can't get required atoms.\n");
xcb_disconnect(dpy);
return EXIT_FAILURE;
}
xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(dpy)).data;
if (screen == NULL) {
fprintf(stderr, "Can't get current screen.\n");
xcb_disconnect(dpy);
return EXIT_FAILURE;
}
xcb_window_t win = xcb_generate_id(dpy);
uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
uint32_t values[] = {0xff111111, XCB_EVENT_MASK_EXPOSURE};
xcb_create_window(dpy, XCB_COPY_FROM_PARENT, win, screen->root, 0, 0, 320, 240, 2,
XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_COPY_FROM_PARENT, mask, values);
xcb_icccm_set_wm_class(dpy, win, sizeof(TEST_WINDOW_IC), TEST_WINDOW_IC);
xcb_map_window(dpy, win);
xcb_flush(dpy);
xcb_generic_event_t *evt;
bool running = true;
while (running && (evt = xcb_wait_for_event(dpy)) != NULL) {
uint8_t rt = XCB_EVENT_RESPONSE_TYPE(evt);
if (rt == XCB_CLIENT_MESSAGE) {
xcb_client_message_event_t *cme = (xcb_client_message_event_t *) evt;
if (cme->type == WM_PROTOCOLS && cme->data.data32[0] == WM_DELETE_WINDOW) {
running = false;
}
} else if (rt == XCB_EXPOSE) {
render_text(dpy, win, 12, 24);
}
free(evt);
}
xcb_destroy_window(dpy, win);
xcb_disconnect(dpy);
return EXIT_SUCCESS;
}
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