weight of diffs that persist across multiple frames.
For each frame, zero out update priority of bytes that no longer have
a pending diff, and add the edit distance of the remaining diffs.
Zero these out as opcodes are retired.
Replace hamming distance with Damerau-Levenshtein distance of the
encoded pixel colours in the byte, e.g. 0x2A --> GGG0 (taking into
account the half-pixel)
This has a couple of benefits over hamming distance of the bit patterns:
- transposed pixels are weighted less (edit distance 1, not 2+ for
Hamming)
- coloured pixels are weighted equally as white pixels (not half as
much)
- weighting changes in palette bit that flip multiple pixel colours
While I'm here, the RLE opcode should emit run_length - 1 so that we
can encode runs of 256 bytes.
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
Add _START and _END addresses that are used by the byte stream to
vector the program counter to the next opcode in the stream.
Support equality testing of opcodes and add tests.
Add an ACK opcode for instructing the client to ACK the TCP stream.
Tick opcode now accepts a cycle argument, for experimenting with
audio support.
