53 lines
2.1 KiB
Plaintext
53 lines
2.1 KiB
Plaintext
Smeargle 0.2.1 readme
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-------------------
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Usage: smeargle.py font.json script.txt
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font.json is a JSON document which describes the font and provides a mapping
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of characters to font indexes and font widths.
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script.txt is a plaintext document without formatting which is rendered as an
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image in both PNG and raw binary formats.
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Script output
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-------------
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The following files are emitted when Smeargle is run:
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* script.png contains the rendered script with deduplication, formatted
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compactly. This is provided so that you can use your favourite viewer to
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inspect the output.
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* script.bin is almost identical to the above; the difference is that it has
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been converted to your font's bitdepth directly.
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* script_index.txt provides an index mapping which tells you how to index
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into the rendered tilemap to reproduce the text.
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font.json format
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----------------
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The following format MUST be observed, or you will not get the output you want.
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Remove '//' and everything following it in each line if you plan to copy/paste
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this example for your own use. Do not leave a trailing comma on the final entry
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in the map.
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{
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"font_name": "Example", // Human-readable, not currently used
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"filename": "example.png", // Filename of the font (PNG)
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"bits_per_pixel": 2, // Depth in bits; 2**n is color count
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"width": 8, // Width of a given tile
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"height": 8, // Height of a given tile
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"map": { // character -> index & width
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" ": {"index": 115, "width": 4}, // Must be a blank tile somewher
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}
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}
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Raw output
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----------
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The raw output is fairly simple. For 2bpp, four pixels are encoded at a time.
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For 3bpp, six pixels are encoded at a time. For 4bpp, only two are encoded at
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a time. Raw output looks like:
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2bpp [0123] -> 0b11100100
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3bpp [01234543] -> 0b01110010 0b01000110 0b10001000
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4bpp [01] -> 0b00010000
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Note that it doesn't matter how the pixels are arranged in the original image;
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your code should be aware of the image dimensions regardless.
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