Thanks for the patches, scrollback is probably the most requested
dvtm feature. You introduced a separate buffer for the scrollback
data, did you consider allocating more space for the main buffer and
just adjusting the scroll_{top,bot} pointers and using them in
madtty_draw to draw only the currently visible area?
I did consider that, actually. Several reasons why I use a separate
buffer:
- From what I understand of vt100/xterm behavior, you can use
DECSTBM to set the scrolling region. If the top line of the screen is
*not* in the scrolling region, you'd need to do some extra work to
have text scroll offscreen.
- The scrollback buffer is a circular buffer for runtime efficiency,
while the screen is a regular array.
- I'd like to add some kind of compression for the scrollback buffer
(e.g. run length encoding for character attributes, convert from
wchar_t using wcsrtombs).
