datenwolf

// color1 and color2 are R4G4B4 12bit RGB color values, alpha is 0-255
uint16_t blend_12bit( uint16_t color1, uint16_t color2, uint8_t alpha ) {
	uint64_t c1 = (uint64_t) color1;
	uint64_t c2 = (uint64_t) color2;
	uint64_t a = (uint64_t)( alpha >> 4 );
	// bit magic to alpha blend R G B with single mul
	c1 = ( c1 | ( c1 << 12 ) ) & 0x0f0f0f;
	c2 = ( c2 | ( c2 << 12 ) ) & 0x0f0f0f;
	uint32_t o = ( ( ( ( c2 - c1 ) * a ) >> 4 ) + c1 ) & 0x0f0f0f;

datenwolf

#!/usr/bin/env python

import sys, os
import platform
import ctypes as ct
import mmap
from enum import Enum
import importlib
import functools
import errno

datenwolf

# Copyright 2020 Jannis Harder
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR

datenwolf

"""
Interactive tool to draw mask on an image or image-like array.

Adapted from matplotlib/examples/event_handling/poly_editor.py

"""
import numpy as np

# import matplotlib as mpl
# mpl.use('tkagg')