wined3d: Copy the DIB to sysmem when PIN_SYSMEM is set.

dlls/wined3d/surface.c

@@ -3234,8 +3234,19 @@ HRESULT CDECL wined3d_surface_releasedc(struct wined3d_surface *surface, HDC dc)
     surface->resource.map_count--;
     surface->flags &= ~SFLAG_DCINUSE;
 
-    if (surface->map_binding == WINED3D_LOCATION_USER_MEMORY)
-        surface_load_location(surface, WINED3D_LOCATION_USER_MEMORY);
+    if (surface->map_binding == WINED3D_LOCATION_USER_MEMORY || (surface->flags & SFLAG_PIN_SYSMEM
+            && surface->map_binding != WINED3D_LOCATION_DIB))
+    {
+        /* The game Salammbo modifies the surface contents without mapping the surface between
+         * a GetDC/ReleaseDC operation and flipping the surface. If the DIB remains the active
+         * copy and is copied to the screen, this update, which draws the mouse pointer, is lost.
+         * Do not only copy the DIB to the map location, but also make sure the map location is
+         * copied back to the DIB in the next getdc call.
+         *
+         * The same consideration applies to user memory surfaces. */
+        surface_load_location(surface, surface->map_binding);
+        surface_invalidate_location(surface, WINED3D_LOCATION_DIB);
+    }
 
     return WINED3D_OK;
 }