forked from forks/qmk_firmware
30 lines
879 B
Markdown
30 lines
879 B
Markdown
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# QMK QGF/QFF RLE data schema :id=qmk-qp-rle-schema
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There are two "modes" to the RLE algorithm used in both [QGF](quantum_painter_qgf.md)/[QFF](quantum_painter_qff.md):
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* Non-repeating sections of octets, with associated length of up to `128` octets
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* `length` = `marker - 128`
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* A corresponding `length` number of octets follow directly after the marker octet
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* Repeated octet with associated length, with associated length of up to `128`
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* `length` = `marker`
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* A single octet follows the marker that should be repeated `length` times.
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Decoder pseudocode:
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```
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while !EOF
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marker = READ_OCTET()
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if marker >= 128
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length = marker - 128
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for i = 0 ... length-1
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c = READ_OCTET()
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WRITE_OCTET(c)
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else
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length = marker
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c = READ_OCTET()
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for i = 0 ... length-1
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WRITE_OCTET(c)
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```
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