the best way to do a 'gl_putboxpartmask'

[Anson Parker]

Hi,   Can anyone suggest the best (fastest/most efficient) way to do a masked gl_putboxpart operation? There's no inbuilt function for it, so I assume you'd need to copy the area in question from the larger bitmap into a separate memory area and then call gl_putboxmask.   Is this right?   Anson.