qtwaylandscanner: Remove globals when destroying wrappers

When globals are destroyed on the compositor side, send the "global_remove"
event and set the resource implementation to nullptr so all further requests
are ignored.

This also adds a compositor test to see if outputs are removed when they are
deleted.

Change-Id: Ib77a4c3d4c2c93283a14ac20f5964e2ce08a1d38
Reviewed-by: David Edmundson <davidedmundson@kde.org>
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

3 files changed, 39 insertions, 6 deletions

diff --git a/tests/auto/compositor/compositor/mockclient.cpp b/tests/auto/compositor/compositor/mockclient.cpp
index 970890a65..85a89f04c 100644
--- a/tests/auto/compositor/compositor/mockclient.cpp
+++ b/tests/auto/compositor/compositor/mockclient.cpp
@@ -42,13 +42,12 @@
 
 const struct wl_registry_listener MockClient::registryListener = {
     MockClient::handleGlobal,
-    nullptr
+    MockClient::handleGlobalRemove
 };
 
 MockClient::MockClient()
     : display(wl_display_connect("wayland-qt-test-0"))
     , compositor(0)
-    , output(0)
     , registry(0)
     , wlshell(0)
     , xdgShell(nullptr)
@@ -75,9 +74,9 @@ MockClient::MockClient()
     timeout.start();
     do {
         QCoreApplication::processEvents();
-    } while (!(compositor && output) && timeout.elapsed() < 1000);
+    } while (!(compositor && !m_outputs.isEmpty()) && timeout.elapsed() < 1000);
 
-    if (!compositor || !output)
+    if (!compositor || m_outputs.empty())
         qFatal("MockClient(): failed to receive globals from display");
 }
 
@@ -166,12 +165,18 @@ void MockClient::handleGlobal(void *data, wl_registry *registry, uint32_t id, co
     resolve(data)->handleGlobal(id, QByteArray(interface));
 }
 
+void MockClient::handleGlobalRemove(void *data, wl_registry *wl_registry, uint32_t id)
+{
+    resolve(data)->handleGlobalRemove(id);
+}
+
 void MockClient::handleGlobal(uint32_t id, const QByteArray &interface)
 {
     if (interface == "wl_compositor") {
         compositor = static_cast<wl_compositor *>(wl_registry_bind(registry, id, &wl_compositor_interface, 1));
     } else if (interface == "wl_output") {
-        output = static_cast<wl_output *>(wl_registry_bind(registry, id, &wl_output_interface, 2));
+        auto output = static_cast<wl_output *>(wl_registry_bind(registry, id, &wl_output_interface, 2));
+        m_outputs.append(output);
         wl_output_add_listener(output, &outputListener, this);
     } else if (interface == "wl_shm") {
         shm = static_cast<wl_shm *>(wl_registry_bind(registry, id, &wl_shm_interface, 1));
@@ -187,6 +192,15 @@ void MockClient::handleGlobal(uint32_t id, const QByteArray &interface)
     }
 }
 
+void MockClient::handleGlobalRemove(uint32_t id)
+{
+    for (auto output : m_outputs) {
+        auto outputId = wl_proxy_get_id(reinterpret_cast<wl_proxy *>(output));
+        if (outputId == id)
+            m_outputs.removeAll(output);
+    }
+}
+
 wl_surface *MockClient::createSurface()
 {
     flushDisplay();
diff --git a/tests/auto/compositor/compositor/mockclient.h b/tests/auto/compositor/compositor/mockclient.h
index 1881393a6..7aa6a3b7b 100644
--- a/tests/auto/compositor/compositor/mockclient.h
+++ b/tests/auto/compositor/compositor/mockclient.h
@@ -64,7 +64,7 @@ public:
 
     wl_display *display;
     wl_compositor *compositor;
-    wl_output *output;
+    QVector<wl_output *> m_outputs;
     wl_shm *shm;
     wl_registry *registry;
     wl_shell *wlshell;
@@ -96,6 +96,7 @@ private:
     static MockClient *resolve(void *data) { return static_cast<MockClient *>(data); }
     static const struct wl_registry_listener registryListener;
     static void handleGlobal(void *data, struct wl_registry *registry, uint32_t id, const char *interface, uint32_t version);
+    static void handleGlobalRemove(void *data, struct wl_registry *wl_registry, uint32_t id);
     static int sourceUpdate(uint32_t mask, void *data);
 
     static void outputGeometryEvent(void *data,
@@ -117,6 +118,7 @@ private:
     static void outputScale(void *data, wl_output *output, int factor);
 
     void handleGlobal(uint32_t id, const QByteArray &interface);
+    void handleGlobalRemove(uint32_t id);
 
     static const wl_output_listener outputListener;
 };
diff --git a/tests/auto/compositor/compositor/tst_compositor.cpp b/tests/auto/compositor/compositor/tst_compositor.cpp
index c54903dc0..39ae1d48c 100644
--- a/tests/auto/compositor/compositor/tst_compositor.cpp
+++ b/tests/auto/compositor/compositor/tst_compositor.cpp
@@ -64,6 +64,7 @@ private slots:
     void sizeFollowsWindow();
     void mapSurface();
     void frameCallback();
+    void removeOutput();
 
     void advertisesXdgShellSupport();
     void createsXdgSurfaces();
@@ -375,6 +376,22 @@ void tst_WaylandCompositor::frameCallback()
     wl_surface_destroy(surface);
 }
 
+void tst_WaylandCompositor::removeOutput()
+{
+    TestCompositor compositor;
+    QWindow window;
+    window.resize(800, 600);
+    auto output = new QWaylandOutput(&compositor, &window);
+
+    compositor.create();
+    MockClient client;
+    QTRY_COMPARE(client.m_outputs.size(), 2);
+
+    delete output;
+    compositor.flushClients();
+    QTRY_COMPARE(client.m_outputs.size(), 1);
+}
+
 void tst_WaylandCompositor::seatCapabilities()
 {
     TestCompositor compositor;