[mutter] tests/runner: Add 'resize_monitor' metatest command

[Marge Bot <marge-bot src gnome org>]

commit 5c26d786f59ea568c7dd9a0d9729342d0eb6aa84
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Aug 3 18:57:10 2022 +0200

    tests/runner: Add 'resize_monitor' metatest command
    
    This will allow tests to change monitor resolution. The first argument
    is the monitor ID; there is always one monitor added by default, and it
    has the id 0. It's currently not possible to add more monitors, so
    passing '0' is the only valid way to resize monitors.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2554>

 src/backends/meta-virtual-monitor.h |  1 +
 src/tests/test-runner.c             | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)
---
diff --git a/src/backends/meta-virtual-monitor.h b/src/backends/meta-virtual-monitor.h
index c127c46cad..6699c8ece9 100644
--- a/src/backends/meta-virtual-monitor.h
+++ b/src/backends/meta-virtual-monitor.h
@@ -70,6 +70,7 @@ void meta_virtual_monitor_info_free (MetaVirtualMonitorInfo *info);
 
 MetaCrtc * meta_virtual_monitor_get_crtc (MetaVirtualMonitor *virtual_monitor);
 
+META_EXPORT_TEST
 MetaCrtcMode * meta_virtual_monitor_get_crtc_mode (MetaVirtualMonitor *virtual_monitor);
 
 META_EXPORT_TEST
diff --git a/src/tests/test-runner.c b/src/tests/test-runner.c
index c67780c9c1..75d9c765de 100644
--- a/src/tests/test-runner.c
+++ b/src/tests/test-runner.c
@@ -989,6 +989,29 @@ test_case_do (TestCase *test,
       if (!meta_test_client_do (client, error, argv[0], argv[2], argv[3], NULL))
         return FALSE;
     }
+  else if (strcmp (argv[0], "resize_monitor") == 0)
+    {
+      MetaBackend *backend = meta_context_get_backend (test->context);
+      MetaMonitorManager *monitor_manager =
+        meta_backend_get_monitor_manager (backend);
+      MetaCrtcMode *crtc_mode;
+      const MetaCrtcModeInfo *crtc_mode_info;
+
+      if (argc != 4)
+        BAD_COMMAND ("usage: %s <monitor-id> <width> <height>", argv[0]);
+
+      if (strcmp (argv[1], "0") != 0 &&
+          strcmp (argv[1], "primary") != 0)
+        BAD_COMMAND ("Unknown monitor %s", argv[1]);
+
+      crtc_mode = meta_virtual_monitor_get_crtc_mode (test->virtual_monitor);
+      crtc_mode_info = meta_crtc_mode_get_info (crtc_mode);
+      meta_virtual_monitor_set_mode (test->virtual_monitor,
+                                     atoi (argv[2]),
+                                     atoi (argv[3]),
+                                     crtc_mode_info->refresh_rate);
+      meta_monitor_manager_reload (monitor_manager);
+    }
   else
     {
       BAD_COMMAND("Unknown command %s", argv[0]);