micropython-font-to-py/font_to_py/bitmap.py

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3.9 KiB
Python
Executable File

# Some code adapted from Daniel Bader's work at the following URL
# https://dbader.org/blog/monochrome-font-rendering-with-freetype-and-python
# With thanks to Stephen Irons @ironss for various improvements, also to
# @enigmaniac for ideas around handling `bdf` and `pcf` files.
# The MIT License (MIT)
#
# Copyright (c) 2016-2023 Peter Hinch
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
class Bitmap:
"""
A 2D bitmap image represented as a list of byte values. Each byte indicates
the state of a single pixel in the bitmap. A value of 0 indicates that the
pixel is `off` and any other value indicates that it is `on`.
"""
def __init__(self, width, height, pixels=None):
self.width = width
self.height = height
self.pixels = pixels or bytearray(width * height)
def display(self):
"""Print the bitmap's pixels."""
for row in range(self.height):
for col in range(self.width):
char = "#" if self.pixels[row * self.width + col] else "."
print(char, end="")
print()
print()
def bitblt(self, src, top, left):
"""Copy all pixels from `src` into this bitmap"""
srcpixel = 0
dstpixel = top * self.width + left
row_offset = self.width - src.width
for _ in range(src.height):
for _ in range(src.width):
self.pixels[dstpixel] = src.pixels[srcpixel]
srcpixel += 1
dstpixel += 1
dstpixel += row_offset
# Horizontal mapping generator function
def get_hbyte(self, reverse):
for row in range(self.height):
col = 0
while True:
bit = col % 8
if bit == 0:
if col >= self.width:
break
byte = 0
if col < self.width:
if reverse:
byte |= self.pixels[row * self.width + col] << bit
else:
# Normal map MSB of byte 0 is (0, 0)
byte |= self.pixels[row * self.width + col] << (7 - bit)
if bit == 7: # noqa: PLR2004
yield byte
col += 1
# Vertical mapping
def get_vbyte(self, reverse):
for col in range(self.width):
row = 0
while True:
bit = row % 8
if bit == 0:
if row >= self.height:
break
byte = 0
if row < self.height:
if reverse:
byte |= self.pixels[row * self.width + col] << (7 - bit)
else:
# Normal map MSB of byte 0 is (0, 7)
byte |= self.pixels[row * self.width + col] << bit
if bit == 7: # noqa: PLR2004
yield byte
row += 1