Column of top left coner of rendered area
(in characters!).
int y1
Row of top left coner of rendered area.
int x2
Column of bottom right coner of rendered area.
int y2
Row of bottom right coner of rendered area.
DESCRIPTION
This function does the trick of converting the emulated framebuffer
into high quality ASCII-art. It is slightly faster and less flexible
the aa_render function.
Note that to see the effect you need to call aa_flush too.
First call to this function may take a while, because the rendering
tables are produced.