From 906661d40bdca048162b097b76bf197f82e6ce9f Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Wed, 7 Feb 2024 17:41:07 -0500
Subject: [PATCH] gdk: Add some subsurface tests

Test that the stacking order is properly maintained.
---
 testsuite/gdk/meson.build  |   1 +
 testsuite/gdk/subsurface.c | 104 +++++++++++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 testsuite/gdk/subsurface.c

diff --git a/testsuite/gdk/meson.build b/testsuite/gdk/meson.build
index c410196a03..927d084ba4 100644
--- a/testsuite/gdk/meson.build
+++ b/testsuite/gdk/meson.build
@@ -60,6 +60,7 @@ internal_tests = [
   { 'name': 'image' },
   { 'name': 'texture' },
   { 'name': 'gltexture' },
+  { 'name': 'subsurface' },
 ]
 
 if host_machine.system() != 'windows'
diff --git a/testsuite/gdk/subsurface.c b/testsuite/gdk/subsurface.c
new file mode 100644
index 0000000000..c38d99ecdd
--- /dev/null
+++ b/testsuite/gdk/subsurface.c
@@ -0,0 +1,104 @@
+#include <gtk/gtk.h>
+#include "gdk/gdksurfaceprivate.h"
+#include "gdk/gdksubsurfaceprivate.h"
+
+#ifdef GDK_WINDOWING_WAYLAND
+#include "gdk/wayland/gdkwayland.h"
+#endif
+
+static void
+test_subsurface_stacking (void)
+{
+  GdkSurface *surface;
+  GdkSubsurface *sub0, *sub1, *sub2;
+  GdkTexture *texture;
+
+#ifdef GDK_WINDOWING_WAYLAND
+  if (!GDK_IS_WAYLAND_DISPLAY (gdk_display_get_default ()))
+#endif
+    {
+      g_test_skip ("No subsurface support");
+      return;
+    }
+
+  surface = gdk_surface_new_toplevel (gdk_display_get_default ());
+
+  g_assert_true (surface->subsurfaces_below == NULL);
+  g_assert_true (surface->subsurfaces_above == NULL);
+
+  sub0 = gdk_surface_create_subsurface (surface);
+  sub1 = gdk_surface_create_subsurface (surface);
+  sub2 = gdk_surface_create_subsurface (surface);
+
+  g_assert_true (gdk_surface_get_n_subsurfaces (surface) == 3);
+  g_assert_true (gdk_surface_get_subsurface (surface, 0) == sub0);
+  g_assert_true (gdk_surface_get_subsurface (surface, 1) == sub1);
+  g_assert_true (gdk_surface_get_subsurface (surface, 2) == sub2);
+
+  texture = gdk_texture_new_from_resource ("/org/gtk/libgtk/icons/16x16/actions/media-eject.png");
+
+  gdk_subsurface_attach (sub0, texture, &GRAPHENE_RECT_INIT (0, 0, 10, 10), TRUE, NULL);
+  gdk_subsurface_attach (sub1, texture, &GRAPHENE_RECT_INIT (0, 0, 10, 10), TRUE, NULL);
+  gdk_subsurface_attach (sub2, texture, &GRAPHENE_RECT_INIT (0, 0, 10, 10), TRUE, NULL);
+
+  g_assert_true (surface->subsurfaces_above == sub2);
+  g_assert_true (sub2->sibling_below == NULL);
+  g_assert_true (sub2->sibling_above == sub1);
+  g_assert_true (sub2->above_parent);
+  g_assert_true (sub1->sibling_below == sub2);
+  g_assert_true (sub1->sibling_above == sub0);
+  g_assert_true (sub1->above_parent);
+  g_assert_true (sub0->sibling_below == sub1);
+  g_assert_true (sub0->sibling_above == NULL);
+  g_assert_true (sub0->above_parent);
+
+  gdk_subsurface_detach (sub1);
+
+  g_assert_true (surface->subsurfaces_above == sub2);
+  g_assert_true (sub2->sibling_below == NULL);
+  g_assert_true (sub2->sibling_above == sub0);
+  g_assert_true (sub2->above_parent);
+  g_assert_true (sub0->sibling_below == sub2);
+  g_assert_true (sub0->sibling_above == NULL);
+  g_assert_true (sub0->above_parent);
+
+  gdk_subsurface_attach (sub2, texture, &GRAPHENE_RECT_INIT (0, 0, 10, 10), FALSE, NULL);
+
+  g_assert_true (surface->subsurfaces_above == sub0);
+  g_assert_true (sub0->sibling_below == NULL);
+  g_assert_true (sub0->sibling_above == NULL);
+  g_assert_true (sub0->above_parent);
+
+  g_assert_true (surface->subsurfaces_below == sub2);
+  g_assert_true (sub2->sibling_below == NULL);
+  g_assert_true (sub2->sibling_above == NULL);
+  g_assert_false (sub2->above_parent);
+
+  gdk_subsurface_attach (sub1, texture, &GRAPHENE_RECT_INIT (0, 0, 10, 10), TRUE, sub2);
+
+  g_assert_true (surface->subsurfaces_below == sub1);
+  g_assert_true (sub1->sibling_above == NULL);
+  g_assert_true (sub1->sibling_below == sub2);
+  g_assert_false (sub1->above_parent);
+  g_assert_true (sub2->sibling_above == sub1);
+  g_assert_true (sub2->sibling_below == NULL);
+  g_assert_false (sub2->above_parent);
+
+  g_object_unref (sub0);
+  g_object_unref (sub1);
+  g_object_unref (sub2);
+
+  g_object_unref (texture);
+
+  gdk_surface_destroy (surface);
+}
+
+int
+main (int argc, char *argv[])
+{
+  gtk_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/subsurface/stacking", test_subsurface_stacking);
+
+  return g_test_run ();
+}