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84 lines (67 loc) · 1.76 KB
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"""
Bit rotation and buffer flipping mod
-----------------------------------
| Copyright 2022 by Joel C. Alcarez |
| [joelalcarez1975@gmail.com] |
|-----------------------------------|
| We make absolutely no warranty |
| of any kind, expressed or implied |
|-----------------------------------|
| Contact primary author |
| if you plan to use this |
| in a commercial product at |
| joelalcarez1975@gmail.com |
-----------------------------------
"""
from array import array
from .mathlib import rotatebits
from .colors import RGB2BGRbuf
def rotatebitsinbuf(
buf: array) -> array:
"""Does a bit rotate to the bytes
in an unsigned byte array
Args:
buf: unsigned byte array
Returns:
unsigned byte array
"""
return array('B', [rotatebits(b)
for b in buf])
def flipnibbleinbuf(
buf: array) -> array:
"""Flips a 4-bit image buffer
Args:
buf: unsigned byte array
Returns:
unsigned byte array
"""
return array('B', [(b >> 4) + ((b % 16) << 4)
for b in buf])
def flip24bitbuf(buf: array) -> array:
"""Flips a 24-bit buffer
Args:
buf: unsigned byte array
Returns:
unsigned byte array
"""
buf.reverse()
RGB2BGRbuf(buf)
return array('B',buf)
def flipbuf(buf: array, bits: int
) -> array:
"""Flips/rotates bits in buffer
Args:
buf : unsigned byte array
bits: (1, 4, 8, 24) bits
Returns:
unsigned byte array
"""
if bits == 24:
buf = flip24bitbuf(buf)
else:
buf.reverse()
if bits == 4:
buf = flipnibbleinbuf(buf)
if bits == 1:
buf = rotatebitsinbuf(buf)
return buf