wined3d: Introduce surface_calculate_size().
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index a1ac336..331015c 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -1920,6 +1920,7 @@
extern const IWineD3DSurfaceVtbl IWineD3DSurface_Vtbl;
extern const IWineD3DSurfaceVtbl IWineGDISurface_Vtbl;
+UINT surface_calculate_size(const struct GlPixelFormatDesc *format_desc, UINT alignment, UINT width, UINT height);
void surface_gdi_cleanup(IWineD3DSurfaceImpl *This);
HRESULT surface_init(IWineD3DSurfaceImpl *surface, WINED3DSURFTYPE surface_type, UINT alignment,
UINT width, UINT height, UINT level, BOOL lockable, BOOL discard, WINED3DMULTISAMPLE_TYPE multisample_type,
