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qmk_firmware-mirror/docs/quantum_painter_rle.md
Nick Brassel 6ef9717288
Vitepress conversion of docs. (#23795)
2024-05-30 12:00:41 +10:00

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QMK QGF/QFF RLE data schema

There are two "modes" to the RLE algorithm used in both QGF/QFF:

  • Non-repeating sections of octets, with associated length of up to 128 octets
    • length = marker - 128
    • A corresponding length number of octets follow directly after the marker octet
  • Repeated octet with associated length, with associated length of up to 128
    • length = marker
    • A single octet follows the marker that should be repeated length times.

Decoder pseudocode:

while !EOF
    marker = READ_OCTET()

    if marker >= 128
        length = marker - 128
        for i = 0 ... length-1
            c = READ_OCTET()
            WRITE_OCTET(c)

    else
        length = marker
        c = READ_OCTET()
        for i = 0 ... length-1
            WRITE_OCTET(c)