C++ (Cpp) xcb_query_text_extents Examples

Example #1

File: screensaver_x11.cpp Project: khandesh/boinc

  /** Draws a black background with white text.
      Should be calld when an expose event is received.
  */
  void redraw() {
    // convert the text to be displayed.
    xcb_char2b_t *str = char2b(text);

    // get the dimensions of the text
    xcb_query_text_extents_cookie_t cookie = 
      xcb_query_text_extents(con, font, text.size(), str);
    delete[] str;

    xcb_generic_error_t *error;
    xcb_query_text_extents_reply_t *reply =
      xcb_query_text_extents_reply(con, cookie, &error);
    if(error)
      {
        std::cerr << "Could not query text extents." << std::endl;
        exit(1);
      }

    // draw the text in the middle of the window.
    xcb_image_text_8(con, text.size(), win, txt_gc,
                     width/2 - reply->overall_width/2, height/2, text.c_str());

    free(reply);
    xcb_flush(con);
  }

Example #2

File: nilwm.c Project: nqv/nilwm

/** Predict text width
 */
int cal_text_width(const char *text, int len) {
    xcb_query_text_extents_cookie_t cookie;
    xcb_query_text_extents_reply_t *reply;

    cookie = xcb_query_text_extents(nil_.con, nil_.font.id, len, (xcb_char2b_t*)text);
    reply = xcb_query_text_extents_reply(nil_.con, cookie, 0);
    if (!reply) {
        NIL_ERR("get text extents %s", text);
        return 7;   /* minimum */
    }
    len = reply->overall_width;
    free(reply);
    return len;
}