mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-12-05 01:15:19 +00:00
30 lines
879 B
Markdown
30 lines
879 B
Markdown
|
# 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)
|
||
|
|
|
||
|
|
```
|