wined3d: Inhibit the screensaver while a full-screen application has focus.

dlls/wined3d/device.c

@@ -912,6 +912,8 @@ static void destroy_default_samplers(struct wined3d_device *device, struct wined
 
 HRESULT CDECL wined3d_device_acquire_focus_window(struct wined3d_device *device, HWND window)
 {
+    unsigned int screensaver_active;
+
     TRACE("device %p, window %p.\n", device, window);
 
     if (!wined3d_register_window(NULL, window, device, 0))
@@ -922,6 +924,9 @@ HRESULT CDECL wined3d_device_acquire_focus_window(struct wined3d_device *device,
 
     InterlockedExchangePointer((void **)&device->focus_window, window);
     SetWindowPos(window, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
+    SystemParametersInfoW(SPI_GETSCREENSAVEACTIVE, 0, &screensaver_active, 0);
+    if ((device->restore_screensaver = !!screensaver_active))
+        SystemParametersInfoW(SPI_SETSCREENSAVEACTIVE, FALSE, NULL, 0);
 
     return WINED3D_OK;
 }
@@ -932,6 +937,11 @@ void CDECL wined3d_device_release_focus_window(struct wined3d_device *device)
 
     if (device->focus_window) wined3d_unregister_window(device->focus_window);
     InterlockedExchangePointer((void **)&device->focus_window, NULL);
+    if (device->restore_screensaver)
+    {
+        SystemParametersInfoW(SPI_SETSCREENSAVEACTIVE, TRUE, NULL, 0);
+        device->restore_screensaver = FALSE;
+    }
 }
 
 static void device_init_swapchain_state(struct wined3d_device *device, struct wined3d_swapchain *swapchain)

dlls/wined3d/swapchain.c

@@ -1172,6 +1172,7 @@ void wined3d_swapchain_activate(struct wined3d_swapchain *swapchain, BOOL activa
 {
     struct wined3d_device *device = swapchain->device;
     HWND window = swapchain->state.device_window;
+    unsigned int screensaver_active;
     BOOL focus_messages, filter;
 
     /* This code is not protected by the wined3d mutex, so it may run while
@@ -1184,6 +1185,10 @@ void wined3d_swapchain_activate(struct wined3d_swapchain *swapchain, BOOL activa
 
     if (activate)
     {
+        SystemParametersInfoW(SPI_GETSCREENSAVEACTIVE, 0, &screensaver_active, 0);
+        if ((device->restore_screensaver = !!screensaver_active))
+            SystemParametersInfoW(SPI_SETSCREENSAVEACTIVE, FALSE, NULL, 0);
+
         if (!(device->create_parms.flags & WINED3DCREATE_NOWINDOWCHANGES))
         {
             /* The d3d versions do not agree on the exact messages here. D3d8 restores
@@ -1209,6 +1214,12 @@ void wined3d_swapchain_activate(struct wined3d_swapchain *swapchain, BOOL activa
     }
     else
     {
+        if (device->restore_screensaver)
+        {
+            SystemParametersInfoW(SPI_SETSCREENSAVEACTIVE, TRUE, NULL, 0);
+            device->restore_screensaver = FALSE;
+        }
+
         if (FAILED(wined3d_set_adapter_display_mode(device->wined3d,
                 device->adapter->ordinal, NULL)))
             ERR("Failed to set display mode.\n");

dlls/wined3d/wined3d_private.h

@@ -3180,7 +3180,8 @@ struct wined3d_device
     BYTE d3d_initialized : 1;
     BYTE inScene : 1;                   /* A flag to check for proper BeginScene / EndScene call pairs */
     BYTE softwareVertexProcessing : 1;  /* process vertex shaders using software or hardware */
-    BYTE padding : 4;
+    BYTE restore_screensaver : 1;
+    BYTE padding : 3;
 
     unsigned char           surface_alignment; /* Line Alignment of surfaces                      */