Included is a Python program for compressing data, and a calc program for decompressing compressed image data. The algorithm is basically LZ compression, but allows for arbitrary sized runs and indexes. For reference, it took a little less than 3 times as long as a straight memcopy to decompress the test image and draw it to the graph screen.
The prgmLZD is 187 bytes and the example splash screen is 533 bytes on calc. Combined they use 720 bytes, compared to 779 bytes for a Pic var of the same dimensions. This means that I actually saved space by putting a decompression program on my calc.
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- LZD Image Compression (published 2 years, 6 months ago; 2018-07-04 02:58 UTC)