File indexing completed on 2024-04-28 16:49:18

 /*
     SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
 #include <cstdlib>
 #include <iostream>
 #include <xcb/xcb.h>
 #include <xcb/xcb_icccm.h>
 
 /*
  * This is a small test app to ensure that KWin calculates the size of a window correctly
  * according to ICCCM section 4.1.2.3
  *
  * The application creates a window and specifies the normal hints with:
  * * min size
  * * base size
  * * size increment
  *
  * With these normal flags the size should be calculated as:
  *     width = base_width + (i * width_inc)
  *     height = base_height + (j * height_inc)
  *
  * With i and j being non-negative integers!
  *
  * This application waits for configure notify events and calculates the i and j and
  * tries to calculate the size it expects. If it doesn't match it exits with a non-zero
  * exit code and prints the mismatching i and/or j value to stderr.
  *
  * To simply quit the application just click into the window. This will return with exit code 0.
  */
 int main(int, char **)
 {
     int screenNumber;
     xcb_connection_t *c = xcb_connect(nullptr, &screenNumber);
 
     auto getScreen = [=]() {
         const xcb_setup_t *setup = xcb_get_setup(c);
         auto it = xcb_setup_roots_iterator(setup);
         for (int i = 0; i < screenNumber; ++i) {
             xcb_screen_next(&it);
         }
         return it.data;
     };
     xcb_screen_t *screen = getScreen();
 
     xcb_window_t w = xcb_generate_id(c);
     const uint32_t values[2] = {
         screen->white_pixel,
         XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_STRUCTURE_NOTIFY};
 
     xcb_create_window(c, 0, w, screen->root, 0, 0, 365, 104, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
                       screen->root_visual, XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK, values);
 
     // set the normal hints
     xcb_size_hints_t hints;
     hints.flags = XCB_ICCCM_SIZE_HINT_P_MIN_SIZE | XCB_ICCCM_SIZE_HINT_BASE_SIZE | XCB_ICCCM_SIZE_HINT_P_RESIZE_INC;
     hints.min_width = 365;
     hints.min_height = 104;
     hints.base_width = 15;
     hints.base_height = 64;
     hints.width_inc = 9;
     hints.height_inc = 18;
     xcb_icccm_set_wm_normal_hints(c, w, &hints);
 
     // and map the window
     xcb_map_window(c, w);
     xcb_flush(c);
 
     bool error = false;
     while (xcb_generic_event_t *event = xcb_wait_for_event(c)) {
         bool exit = false;
         if ((event->response_type & ~0x80) == XCB_BUTTON_RELEASE) {
             exit = true;
         } else if ((event->response_type & ~0x80) == XCB_CONFIGURE_NOTIFY) {
             auto *ce = reinterpret_cast<xcb_configure_notify_event_t *>(event);
             const double i = (ce->width - hints.base_width) / (double)hints.width_inc;
             const double j = (ce->height - hints.base_height) / (double)hints.height_inc;
             // according to ICCCM the size should be:
             // width = base_width + (i * width_inc)
             // height = base_height + (j * height_inc)
             // thus if the window manager configured correctly we get the same result
             if (hints.base_width + (int(i) * hints.width_inc) != ce->width) {
                 std::cerr << "Incorrect width - i factor is " << i << std::endl;
                 exit = true;
                 error = true;
             }
             if (hints.base_height + (int(j) * hints.height_inc) != ce->height) {
                 std::cerr << "Incorrect height - j factor is " << i << std::endl;
                 exit = true;
                 error = true;
             }
         }
         free(event);
         if (exit) {
             break;
         }
     }
 
     xcb_disconnect(c);
     return error ? 1 : 0;
 }