[mutter/gnome-40] tests: Add test for setting min/max wayland toplevel limits

[Jonas Ådahl <jadahl src gnome org>]

commit 55e65180e32caafccf99890880ddf9b2a48fdbde
Author: Christian Rauch <Rauch Christian gmx de>
Date:   Fri Jun 18 22:51:39 2021 +0100

    tests: Add test for setting min/max wayland toplevel limits
    
    Fixes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1716
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1795>
    (cherry picked from commit 258b85a5a7e096dc2dbc3ab86098333ee5cf94b0)

 src/tests/wayland-test-clients/meson.build        |   1 +
 src/tests/wayland-test-clients/xdg-apply-limits.c | 408 ++++++++++++++++++++++
 src/tests/wayland-unit-tests.c                    |  88 +++++
 3 files changed, 497 insertions(+)
---
diff --git a/src/tests/wayland-test-clients/meson.build b/src/tests/wayland-test-clients/meson.build
index 5646493430..551a0d9468 100644
--- a/src/tests/wayland-test-clients/meson.build
+++ b/src/tests/wayland-test-clients/meson.build
@@ -49,6 +49,7 @@ wayland_test_clients = [
   'subsurface-remap-toplevel',
   'invalid-subsurfaces',
   'invalid-xdg-shell-actions',
+  'xdg-apply-limits',
 ]
 
 foreach test : wayland_test_clients
diff --git a/src/tests/wayland-test-clients/xdg-apply-limits.c 
b/src/tests/wayland-test-clients/xdg-apply-limits.c
new file mode 100644
index 0000000000..aa5ab6e70e
--- /dev/null
+++ b/src/tests/wayland-test-clients/xdg-apply-limits.c
@@ -0,0 +1,408 @@
+/*
+ * Copyright (C) 2021 Christian Rauch
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <glib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <wayland-client.h>
+
+#include "wayland-test-client-utils.h"
+
+#include "test-driver-client-protocol.h"
+#include "xdg-shell-client-protocol.h"
+
+typedef enum _State
+{
+  STATE_INIT = 0,
+  STATE_WAIT_FOR_CONFIGURE_1,
+  STATE_WAIT_FOR_FRAME_1,
+  STATE_WAIT_FOR_ACTOR_DESTROYED,
+  STATE_WAIT_FOR_CONFIGURE_2,
+  STATE_WAIT_FOR_FRAME_2
+} State;
+
+static struct wl_display *display;
+static struct wl_registry *registry;
+static struct wl_compositor *compositor;
+static struct wl_subcompositor *subcompositor;
+static struct xdg_wm_base *xdg_wm_base;
+static struct wl_shm *shm;
+static struct test_driver *test_driver;
+
+static struct wl_surface *surface;
+static struct xdg_surface *xdg_surface;
+static struct xdg_toplevel *xdg_toplevel;
+
+static struct wl_surface *subsurface_surface;
+static struct wl_subsurface *subsurface;
+
+static struct wl_callback *frame_callback;
+
+static gboolean running;
+
+static State state;
+
+static void
+init_surface (void)
+{
+  xdg_toplevel_set_title (xdg_toplevel, "toplevel-limits-test");
+  wl_surface_commit (surface);
+}
+
+static void
+actor_destroyed (void               *data,
+                 struct wl_callback *callback,
+                 uint32_t            serial)
+{
+  g_assert_cmpint (state, ==, STATE_WAIT_FOR_ACTOR_DESTROYED);
+
+  init_surface ();
+  state = STATE_WAIT_FOR_CONFIGURE_2;
+
+  wl_callback_destroy (callback);
+}
+
+static const struct wl_callback_listener actor_destroy_listener = {
+  actor_destroyed,
+};
+
+static void
+reset_surface (void)
+{
+  struct wl_callback *callback;
+
+  if (test_driver)
+    {
+      callback = test_driver_sync_actor_destroyed (test_driver, surface);
+      wl_callback_add_listener (callback, &actor_destroy_listener, NULL);
+    }
+
+  wl_surface_attach (surface, NULL, 0, 0);
+  wl_surface_commit (surface);
+
+  state = STATE_WAIT_FOR_ACTOR_DESTROYED;
+}
+
+static void
+handle_buffer_release (void             *data,
+                       struct wl_buffer *buffer)
+{
+  wl_buffer_destroy (buffer);
+}
+
+static const struct wl_buffer_listener buffer_listener = {
+  handle_buffer_release
+};
+
+static gboolean
+create_shm_buffer (int                width,
+                   int                height,
+                   struct wl_buffer **out_buffer,
+                   void             **out_data,
+                   int               *out_size)
+{
+  struct wl_shm_pool *pool;
+  static struct wl_buffer *buffer;
+  int fd, size, stride;
+  int bytes_per_pixel;
+  void *data;
+
+  bytes_per_pixel = 4;
+  stride = width * bytes_per_pixel;
+  size = stride * height;
+
+  fd = create_anonymous_file (size);
+  if (fd < 0)
+    {
+      fprintf (stderr, "Creating a buffer file for %d B failed: %m\n",
+               size);
+      return FALSE;
+    }
+
+  data = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+  if (data == MAP_FAILED)
+    {
+      fprintf (stderr, "mmap failed: %m\n");
+      close (fd);
+      return FALSE;
+    }
+
+  pool = wl_shm_create_pool (shm, fd, size);
+  buffer = wl_shm_pool_create_buffer (pool, 0,
+                                      width, height,
+                                      stride,
+                                      WL_SHM_FORMAT_ARGB8888);
+  wl_buffer_add_listener (buffer, &buffer_listener, buffer);
+  wl_shm_pool_destroy (pool);
+  close (fd);
+
+  *out_buffer = buffer;
+  *out_data = data;
+  *out_size = size;
+
+  return TRUE;
+}
+
+static void
+fill (void    *buffer_data,
+      int      width,
+      int      height,
+      uint32_t color)
+{
+  uint32_t *pixels = buffer_data;
+  int x, y;
+
+  for (y = 0; y < height; y++)
+    {
+      for (x = 0; x < width; x++)
+        pixels[y * width + x] = color;
+    }
+}
+
+static void
+draw (struct wl_surface *surface,
+      int                width,
+      int                height,
+      uint32_t           color)
+{
+  struct wl_buffer *buffer;
+  void *buffer_data;
+  int size;
+
+  if (!create_shm_buffer (width, height,
+                          &buffer, &buffer_data, &size))
+    g_error ("Failed to create shm buffer");
+
+  fill (buffer_data, width, height, color);
+
+  wl_surface_attach (surface, buffer, 0, 0);
+}
+
+static void
+draw_main (void)
+{
+  draw (surface, 700, 500, 0xff00ff00);
+}
+
+static void
+draw_subsurface (void)
+{
+  draw (subsurface_surface, 500, 300, 0xff007f00);
+}
+
+static void
+handle_xdg_toplevel_configure (void                *data,
+                               struct xdg_toplevel *xdg_toplevel,
+                               int32_t              width,
+                               int32_t              height,
+                               struct wl_array     *state)
+{
+}
+
+static void
+handle_xdg_toplevel_close(void                *data,
+                          struct xdg_toplevel *xdg_toplevel)
+{
+  g_assert_not_reached ();
+}
+
+static const struct xdg_toplevel_listener xdg_toplevel_listener = {
+  handle_xdg_toplevel_configure,
+  handle_xdg_toplevel_close,
+};
+
+static void
+handle_frame_callback (void               *data,
+                       struct wl_callback *callback,
+                       uint32_t            time)
+{
+  switch (state)
+    {
+    case STATE_WAIT_FOR_FRAME_1:
+      reset_surface ();
+      test_driver_sync_point (test_driver, 1);
+      break;
+    case STATE_WAIT_FOR_FRAME_2:
+      exit (EXIT_SUCCESS);
+    case STATE_INIT:
+      g_assert_not_reached ();
+    case STATE_WAIT_FOR_CONFIGURE_1:
+      g_assert_not_reached ();
+    case STATE_WAIT_FOR_ACTOR_DESTROYED:
+      g_assert_not_reached ();
+    case STATE_WAIT_FOR_CONFIGURE_2:
+      g_assert_not_reached ();
+    }
+}
+
+static const struct wl_callback_listener frame_listener = {
+  handle_frame_callback,
+};
+
+static void
+handle_xdg_surface_configure (void               *data,
+                              struct xdg_surface *xdg_surface,
+                              uint32_t            serial)
+{
+  switch (state)
+    {
+    case STATE_INIT:
+      g_assert_not_reached ();
+    case STATE_WAIT_FOR_CONFIGURE_1:
+      draw_main ();
+      state = STATE_WAIT_FOR_FRAME_1;
+      break;
+    case STATE_WAIT_FOR_CONFIGURE_2:
+      draw_main ();
+      state = STATE_WAIT_FOR_FRAME_2;
+      break;
+    case STATE_WAIT_FOR_ACTOR_DESTROYED:
+      g_assert_not_reached ();
+    case STATE_WAIT_FOR_FRAME_1:
+    case STATE_WAIT_FOR_FRAME_2:
+      /* ignore */
+      return;
+    }
+
+  xdg_surface_ack_configure (xdg_surface, serial);
+  frame_callback = wl_surface_frame (surface);
+  wl_callback_add_listener (frame_callback, &frame_listener, NULL);
+  wl_surface_commit (surface);
+  wl_display_flush (display);
+}
+
+static const struct xdg_surface_listener xdg_surface_listener = {
+  handle_xdg_surface_configure,
+};
+
+static void
+handle_xdg_wm_base_ping (void               *data,
+                         struct xdg_wm_base *xdg_wm_base,
+                         uint32_t            serial)
+{
+  xdg_wm_base_pong (xdg_wm_base, serial);
+}
+
+static const struct xdg_wm_base_listener xdg_wm_base_listener = {
+  handle_xdg_wm_base_ping,
+};
+
+static void
+handle_registry_global (void               *data,
+                        struct wl_registry *registry,
+                        uint32_t            id,
+                        const char         *interface,
+                        uint32_t            version)
+{
+  if (strcmp (interface, "wl_compositor") == 0)
+    {
+      compositor = wl_registry_bind (registry, id, &wl_compositor_interface, 1);
+    }
+  else if (strcmp (interface, "wl_subcompositor") == 0)
+    {
+      subcompositor = wl_registry_bind (registry,
+                                        id, &wl_subcompositor_interface, 1);
+    }
+  else if (strcmp (interface, "xdg_wm_base") == 0)
+    {
+      xdg_wm_base = wl_registry_bind (registry, id,
+                                      &xdg_wm_base_interface, 1);
+      xdg_wm_base_add_listener (xdg_wm_base, &xdg_wm_base_listener, NULL);
+    }
+  else if (strcmp (interface, "wl_shm") == 0)
+    {
+      shm = wl_registry_bind (registry,
+                              id, &wl_shm_interface, 1);
+    }
+  else if (strcmp (interface, "test_driver") == 0)
+    {
+      test_driver = wl_registry_bind (registry, id, &test_driver_interface, 1);
+    }
+}
+
+static void
+handle_registry_global_remove (void               *data,
+                               struct wl_registry *registry,
+                               uint32_t            name)
+{
+}
+
+static const struct wl_registry_listener registry_listener = {
+  handle_registry_global,
+  handle_registry_global_remove
+};
+
+int
+main (int    argc,
+      char **argv)
+{
+  display = wl_display_connect (NULL);
+  registry = wl_display_get_registry (display);
+  wl_registry_add_listener (registry, &registry_listener, NULL);
+  wl_display_roundtrip (display);
+
+  if (!shm)
+    {
+      fprintf (stderr, "No wl_shm global\n");
+      return EXIT_FAILURE;
+    }
+
+  if (!xdg_wm_base)
+    {
+      fprintf (stderr, "No xdg_wm_base global\n");
+      return EXIT_FAILURE;
+    }
+
+  wl_display_roundtrip (display);
+
+  // g_assert_nonnull (test_driver);
+
+  surface = wl_compositor_create_surface (compositor);
+  xdg_surface = xdg_wm_base_get_xdg_surface (xdg_wm_base, surface);
+  xdg_surface_add_listener (xdg_surface, &xdg_surface_listener, NULL);
+  xdg_toplevel = xdg_surface_get_toplevel (xdg_surface);
+  xdg_toplevel_add_listener (xdg_toplevel, &xdg_toplevel_listener, NULL);
+
+  subsurface_surface = wl_compositor_create_surface (compositor);
+  subsurface = wl_subcompositor_get_subsurface (subcompositor,
+                                                subsurface_surface,
+                                                surface);
+  wl_subsurface_set_position (subsurface, 100, 100);
+  draw_subsurface ();
+  wl_surface_commit (subsurface_surface);
+
+  init_surface ();
+  state = STATE_WAIT_FOR_CONFIGURE_1;
+
+  /* set minimum and maximum size and commit */
+  xdg_toplevel_set_min_size(xdg_toplevel, 700, 500);
+  xdg_toplevel_set_max_size(xdg_toplevel, 700, 500);
+  wl_surface_commit (surface);
+
+  test_driver_sync_point (test_driver, 0);
+
+  running = TRUE;
+  while (running)
+    {
+      if (wl_display_dispatch (display) == -1)
+        return EXIT_FAILURE;
+    }
+
+  return EXIT_SUCCESS;
+}
diff --git a/src/tests/wayland-unit-tests.c b/src/tests/wayland-unit-tests.c
index f8e6508d98..98c2d905ad 100644
--- a/src/tests/wayland-unit-tests.c
+++ b/src/tests/wayland-unit-tests.c
@@ -21,6 +21,8 @@
 
 #include <gio/gio.h>
 
+#include "core/display-private.h"
+#include "core/window-private.h"
 #include "tests/meta-wayland-test-driver.h"
 #include "wayland/meta-wayland.h"
 #include "wayland/meta-wayland-surface.h"
@@ -118,6 +120,25 @@ wayland_test_client_finish (WaylandTestClient *wayland_test_client)
   g_free (wayland_test_client);
 }
 
+static MetaWindow *
+find_client_window (const char *title)
+{
+  MetaDisplay *display = meta_get_display ();
+  g_autoptr (GSList) windows = NULL;
+  GSList *l;
+
+  windows = meta_display_list_windows (display, META_LIST_DEFAULT);
+  for (l = windows; l; l = l->next)
+    {
+      MetaWindow *window = l->data;
+
+      if (g_strcmp0 (meta_window_get_title (window), title) == 0)
+        return window;
+    }
+
+  return NULL;
+}
+
 static void
 subsurface_remap_toplevel (void)
 {
@@ -153,6 +174,71 @@ subsurface_invalid_xdg_shell_actions (void)
   g_test_assert_expected_messages ();
 }
 
+typedef enum _ApplyLimitState
+{
+  APPLY_LIMIT_STATE_INIT,
+  APPLY_LIMIT_STATE_RESET,
+  APPLY_LIMIT_STATE_FINISH,
+} ApplyLimitState;
+
+typedef struct _ApplyLimitData
+{
+  GMainLoop *loop;
+  WaylandTestClient *wayland_test_client;
+  ApplyLimitState state;
+} ApplyLimitData;
+
+static void
+on_sync_point (MetaWaylandTestDriver *test_driver,
+               unsigned int           sequence,
+               struct wl_client      *wl_client,
+               ApplyLimitData        *data)
+{
+  MetaWindow *window;
+
+  if (sequence == 0)
+    g_assert (data->state == APPLY_LIMIT_STATE_INIT);
+  else if (sequence == 0)
+    g_assert (data->state == APPLY_LIMIT_STATE_RESET);
+
+  window = find_client_window ("toplevel-limits-test");
+
+  if (sequence == 0)
+    {
+      g_assert_nonnull (window);
+      g_assert_cmpint (window->size_hints.max_width, ==, 700);
+      g_assert_cmpint (window->size_hints.max_height, ==, 500);
+      g_assert_cmpint (window->size_hints.min_width, ==, 700);
+      g_assert_cmpint (window->size_hints.min_height, ==, 500);
+
+      data->state = APPLY_LIMIT_STATE_RESET;
+    }
+  else if (sequence == 1)
+    {
+      g_assert_null (window);
+      data->state = APPLY_LIMIT_STATE_FINISH;
+      g_main_loop_quit (data->loop);
+    }
+  else
+    {
+      g_assert_not_reached ();
+    }
+}
+
+static void
+toplevel_apply_limits (void)
+{
+  ApplyLimitData data = {};
+
+  data.loop = g_main_loop_new (NULL, FALSE);
+  data.wayland_test_client = wayland_test_client_new ("xdg-apply-limits");
+  g_signal_connect (test_driver, "sync-point", G_CALLBACK (on_sync_point), &data);
+  g_main_loop_run (data.loop);
+  g_assert_cmpint (data.state, ==, APPLY_LIMIT_STATE_FINISH);
+  wayland_test_client_finish (data.wayland_test_client);
+  g_test_assert_expected_messages ();
+}
+
 void
 pre_run_wayland_tests (void)
 {
@@ -173,4 +259,6 @@ init_wayland_tests (void)
                    subsurface_invalid_subsurfaces);
   g_test_add_func ("/wayland/subsurface/invalid-xdg-shell-actions",
                    subsurface_invalid_xdg_shell_actions);
+  g_test_add_func ("/wayland/toplevel/apply-limits",
+                   toplevel_apply_limits);
 }