a lot of routines were left blank in the initial port to get
through the core graphics primitives porting. This commit
fills in those missing bits in a fashion that optimizes the
modals for drawing on small displays.
so, there is a fundamental abstraction mismatch in the blitstr
library. In Precursor, I created a rule that you can't draw text
on black backgrounds without some special permissions in highly
trusted contexts.
For baosec, this restriction is removed because the whole OS
can run inside a single chip (i.e. we have eliminated most
easy RAM modification attacks, requires probing/glitching; but
as a trade-off, we don't have as much RAM so we can't afford the
extra abstractions).
The compromise is for OLED-type platforms where inverse drawing
is very common to save power, all text ops are assumed to be XOR
operations (so you're always flipping pixels instead of drawing
at a defined color).
this can accelerate drawing of complicated objects, such as
QR codes, that are composed of many rectangles.
there are some warts...in theory, this should be able to seralize
arbitrary-sized lists, but there must be some bug somewhere
that is preventing it from happening. For now, the list length
is clipped to the capacity of a page of memory.
the text bounds api call is needed in v2 because there is no gam
to mediate this call
clear allows for a fast clear operation that may have hardware
dependent consequences
acquire/release of modals mode is added to the graphics server
as well to implement a feature previously handled by the gam
