wined3d: Restore the gamma when destroying the swapchain.

dlls/wined3d/device.c

@@ -1599,6 +1599,8 @@ static HRESULT WINAPI IWineD3DDeviceImpl_CreateAdditionalSwapChain(IWineD3DDevic
         object->wantsDepthStencilBuffer = FALSE;
     }
 
+    IWineD3DSwapChain_GetGammaRamp((IWineD3DSwapChain *) object, &object->orig_gamma);
+
     TRACE("Created swapchain %p\n", object);
     TRACE("FrontBuf @ %p, BackBuf @ %p, DepthStencil %d\n",object->frontBuffer, object->backBuffer ? object->backBuffer[0] : NULL, object->wantsDepthStencilBuffer);
     return WINED3D_OK;

dlls/wined3d/swapchain.c

@@ -88,6 +88,10 @@ static void WINAPI IWineD3DSwapChainImpl_Destroy(IWineD3DSwapChain *iface, D3DCB
     WINED3DDISPLAYMODE mode;
     int i;
 
+    TRACE("Destroying swapchain %p\n", iface);
+
+    IWineD3DSwapChain_SetGammaRamp(iface, 0, &This->orig_gamma);
+
     /* release the ref to the front and back buffer parents */
     if(This->frontBuffer) {
         IWineD3DSurface_SetContainer(This->frontBuffer, 0);

dlls/wined3d/wined3d_private.h

@@ -1698,6 +1698,7 @@ typedef struct IWineD3DSwapChainImpl
     WINED3DPRESENT_PARAMETERS presentParms;
     DWORD                     orig_width, orig_height;
     WINED3DFORMAT             orig_fmt;
+    WINED3DGAMMARAMP          orig_gamma;
 
     long prev_time, frames;   /* Performance tracking */
     unsigned int vSyncCounter;