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diff --git a/docs/quantum_painter_rle.md b/docs/quantum_painter_rle.md new file mode 100644 index 0000000000..dcb9a1e1a7 --- /dev/null +++ b/docs/quantum_painter_rle.md @@ -0,0 +1,29 @@ +# QMK QGF/QFF RLE data schema :id=qmk-qp-rle-schema + +There are two "modes" to the RLE algorithm used in both [QGF](quantum_painter_qgf.md)/[QFF](quantum_painter_qff.md): + +* 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) + +``` |