ddraw: Better validation of IDirectDrawSurface::BltFast parameters.

[Henri Verbeet]

On 18 June 2010 15:52, Iain Arnell <iarnell at gmail.com> wrote:
> -           dsty + rsrc->bottom - rsrc->top > This->surface_desc.dwHeight)
> +           dsty + rsrc->bottom - rsrc->top > This->surface_desc.dwHeight ||
> +           (dstx | dsty) & (1<<(sizeof(DWORD)*8-1)) /* dstx or dsty negative */ )
That's not very pretty. This looks like it's just an integer overflow,
so that's probably also how you should handle it.