> Support for portrait screens in Plan 9 (e.g., on the bitsy) > has always depended on the underlying hardware being > able to present a portrait frame buffer, with the pixels > still in row-major order. That is, the "rotation" is done > in hardware, not software.
Correct. On the bitsy we actually did the rotation in the driver,
while copying into the frame buffer. This only works on something
like bitsies with their tiny screens. It'd be horrendously slow
on, say, a 1920x1200 screen.
Sape
