[AD] power-of-two textures?

[Peter Wang <novalazy@xxxxxxxxxx>]

Hi,

Apparently my old, old video card or its driver doesn't support
non-power-of-two textures, so the current X driver doesn't work.

What is the plan for Allegro to support such a limitation?  Do we just
need to modify ALLEGRO_BITMAP to hold the "actual" width and height
fields, and allocate extra space?  `al_lock_bitmap' would take that into
account when calculating the pitch.  What else needs to be done?

Peter