Format of structure:
Offset	Size	Description	)
 00h	WORD	image source (0 = conventional memory, 1 = expanded memory)
 02h	DWORD	pointer to image data
 06h	WORD	scan line on which to place
 08h	WORD	bit offset from start of scan line at which to place
 0Ah	WORD	density of bitmap data (300, 600, or 1200 dpi)
 0Ch	WORD	width in bits of data
 0Eh	WORD	source logical page number
 10h	WORD	source handle (only if source in expanded memory)
 12h	WORD	source offset (only if source in expanded memory)