bytemap, (page,offset) memory map)
- add a FlatMemoryMap that is a linear 8K array
- add converter methods and default constructors that allow converting
between them
- use MemoryMap as the central representation used by the video encoder
opcodes until the cycle budget for the frame is exhausted.
Output stream is also now aware of TCP framing, and schedules an ACK
opcode every 2048 output bytes to instruct the client to perform
TCP ACK and buffer management.
Fixes several serious bugs in RLE encoding, including:
- we were emitting the RLE opcode with the next content byte after the
run completed!
- we were looking at the wrong field for the start offset!
- handle the case where the entire page is a single run
- stop trying to allow accumulating error when RLE -- this does not
respect the Apple II colour encoding, i.e. may introduce colour
fringing.
- also because of this we're unlikely to actually be able to find
many runs because odd and even columns are encoded differently. In
a followup we should start encoding odd and even columns separately
Optimize after profiling -- encoder is now about 2x faster
Add tests.
