nanogui@linuxhacker.org

> Suppose you have a 1-bit depth bitmap.  With a byte-granular quantity
> (i.e., line_len, etc.), how can you specify a non-byte-aligned
> subbitmap?  You can't.  So if you want to support subbitmaps you have
> to use pixel offsets, not byte offsets, which isn't as simple.
> 

Ah yes, I figured you were going to comment on my quick comment.
This can be solved by adding 

	COORD x,y;

which are the viewpoint's initial starting positions, relative to the bitmap
origin, in pixel units.  This is used to create the starting mask and/or pixel
offset, much like the original bitmap will have to if required to blt to a screen
pixel address...