[PATCH 2/8] d3d9/tests: Restore display modes at the end of test_wndproc().

[Zhiyi Zhang]

test_wndproc() makes a series of ChangeDisplaySettings() calls that could make the current display
mode no longer match the registry display mode. Restore display modes at the end of test_wndproc()
so that other tests are not affected.

Signed-off-by: Zhiyi Zhang 
---
 dlls/d3d9/tests/device.c | 73 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 72 insertions(+), 1 deletion(-)

diff --git a/dlls/d3d9/tests/device.c b/dlls/d3d9/tests/device.c
index 53a83ad887b..0f0de5e3382 100644
--- a/dlls/d3d9/tests/device.c
+++ b/dlls/d3d9/tests/device.c
@@ -25,6 +25,7 @@
 #define COBJMACROS
 #include <d3d9.h>
 #include "utils.h"
+#include "wine/heap.h"

struct vec3
 {
@@ -158,6 +159,69 @@ static BOOL adapter_is_warp(const D3DADAPTER_IDENTIFIER9 *identifier)
     return !strcmp(identifier->Driver, "d3d10warp.dll");
 }

+/* Free original_modes after finished using it */
+static BOOL save_display_modes(DEVMODEW **original_modes, unsigned int *display_count)
+{
+    unsigned int number, size = 2, count = 0, index = 0;
+    DISPLAY_DEVICEW display_device;
+    DEVMODEW *modes, *tmp;
+
+    if (!(modes = heap_alloc(size * sizeof(*modes))))
+        return FALSE;
+
+    display_device.cb = sizeof(display_device);
+    while (EnumDisplayDevicesW(NULL, index++, &display_device, 0))
+    {
+        /* Skip software devices */
+        if (swscanf(display_device.DeviceName, L"\\.\DISPLAY%u", &number) != 1)
+            continue;
+
+        if (!(display_device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP))
+            continue;
+
+        if (count >= size)
+        {
+            size *= 2;
+            if (!(tmp = heap_realloc(modes, size * sizeof(*modes))))
+            {
+                heap_free(modes);
+                return FALSE;
+            }
+            modes = tmp;
+        }
+
+        memset(&modes[count], 0, sizeof(modes[count]));
+        modes[count].dmSize = sizeof(modes[count]);
+        if (!EnumDisplaySettingsW(display_device.DeviceName, ENUM_CURRENT_SETTINGS, &modes[count]))
+        {
+            heap_free(modes);
+            return FALSE;
+        }
+
+        lstrcpyW(modes[count++].dmDeviceName, display_device.DeviceName);
+    }
+
+    *original_modes = modes;
+    *display_count = count;
+    return TRUE;
+}
+
+static BOOL restore_display_modes(DEVMODEW *modes, unsigned int count)
+{
+    unsigned int index;
+    LONG ret;
+
+    for (index = 0; index < count; ++index)
+    {
+        ret = ChangeDisplaySettingsExW(modes[index].dmDeviceName, &modes[index], NULL,
+                CDS_UPDATEREGISTRY | CDS_NORESET, NULL);
+        if (ret != DISP_CHANGE_SUCCESSFUL)
+            return FALSE;
+    }
+    ret = ChangeDisplaySettingsExW(NULL, NULL, NULL, 0, NULL);
+    return ret == DISP_CHANGE_SUCCESSFUL;
+}
+
 static IDirect3DDevice9 *create_device(IDirect3D9 *d3d9, HWND focus_window, const struct device_desc *desc)
 {
     D3DPRESENT_PARAMETERS present_parameters = {0};
@@ -3758,6 +3822,8 @@ static DWORD WINAPI wndproc_thread(void *param)
 static void test_wndproc(void)
 {
     struct wndproc_thread_param thread_params;
+    DEVMODEW devmode, *original_modes = NULL;
+    unsigned int display_count = 0;
     struct device_desc device_desc;
     static WINDOWPOS windowpos;
     IDirect3DDevice9 *device;
@@ -3772,7 +3838,6 @@ static void test_wndproc(void)
     HRESULT hr;
     D3DDISPLAYMODE d3ddm;
     DWORD d3d_width = 0, d3d_height = 0, user32_width = 0, user32_height = 0;
-    DEVMODEW devmode;
     LONG change_ret, device_style;
     BOOL ret;

@@ -3997,6 +4062,9 @@ static void test_wndproc(void)
         return;
     }

+    ret = save_display_modes(&original_modes, &display_count);
+    ok(ret, "Failed to save original display modes.\n");
+
     filter_messages = NULL;
     expect_messages = NULL;

@@ -4435,6 +4503,9 @@ done:
     CloseHandle(thread_params.test_finished);
     CloseHandle(thread_params.window_created);
     UnregisterClassA("d3d9_test_wndproc_wc", GetModuleHandleA(NULL));
+    ret = restore_display_modes(original_modes, display_count);
+    ok(ret, "Failed to restore display modes.\n");
+    heap_free(original_modes);
 }

static void test_wndproc_windowed(void)