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4251c9938f
Add a new DHGRBitmap class that efficiently represents the DHGR interleaving of the (aux, main) MemoryMap as a sequence of 28-bit integers. This allows for easily extracting the 8-bit and 12-bit subsequences representing the DHGR pixels that are influenced when storing a byte at offsets 0..3 within the interleaved (aux, main, aux, main) sequence. Since we have precomputed all of the pairwise differences between these 8- and 12-bit values, this allows us to efficiently compute the edit distances between pairs of screen bytes (and/or arrays)