2. Contiki contains general purpose screen drawing code written in C
that creates windows from two horizontal lines, two vertical lines and
four corners. This code is used for the "downlevel" version while the
mousetext version uses custom code that creates a window by calling a
single C-Library assembler function available only for mousetext.
Beside that the custom code does no window clipping. That further
reduces code size but increases flicker - which I classified
acceptable due to the general high(er) drawing speed.
Best, Oliver