kopia lustrzana https://github.com/peterhinch/micropython-font-to-py
Initial version not fully tested
rodzic
ae5b00c7d1
commit
3ba89d2e0d
10
README.md
10
README.md
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@ -47,22 +47,23 @@ target display hardware. Their usage should be defined in the documentation for
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the device driver.
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the device driver.
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Example usage to produce a file ``myfont.py`` with height of 23 pixels:
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Example usage to produce a file ``myfont.py`` with height of 23 pixels:
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``font_to_py.py FreeSans.ttf 23 -o myfont.py``
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``font_to_py.py FreeSans.ttf 23 myfont.py``
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## Arguments
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## Arguments
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### Mandatory arguments:
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### Mandatory positional arguments:
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1. Font file path. Must be a ttf or otf file.
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1. Font file path. Must be a ttf or otf file.
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2. Height in pixels.
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2. Height in pixels.
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3. -o or --outfile Output file path. Must have a .py extension.
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3. Output file path. Must have a .py extension.
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### Optional arguments:
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### Optional arguments:
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* -f or --fixed If specified, all characters will have the same width. By
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* -f or --fixed If specified, all characters will have the same width. By
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default fonts are assumed to be variable pitch.
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default fonts are assumed to be variable pitch.
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* -h Specifies horizontal mapping (default is vertical).
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* -x Specifies horizontal mapping (default is vertical).
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* -b Specifies bit reversal in each font byte.
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* -b Specifies bit reversal in each font byte.
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* -t Specifies test mode: output file suitable for cPython test programs only.
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Optional arguments other than the fixed pitch argument will be specified in the
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Optional arguments other than the fixed pitch argument will be specified in the
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device driver documentation. Bit reversal is required by some display hardware.
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device driver documentation. Bit reversal is required by some display hardware.
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@ -119,6 +120,7 @@ has the following outline definition (in practice the bytes objects are large):
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```python
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```python
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version = '0.1'
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version = '0.1'
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test = False
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height = 23
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height = 23
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width = 22
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width = 22
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vmap = True
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vmap = True
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@ -0,0 +1,533 @@
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#! /usr/bin/python3
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# -*- coding: utf-8 -*-
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# Needs freetype-py>=1.0
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# Some code adapted from Daniel Bader's work at the following URL
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# http://dbader.org/blog/monochrome-font-rendering-with-freetype-and-python
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# The MIT License (MIT)
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#
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# Copyright (c) 2016 Peter Hinch
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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import freetype
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import argparse
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import sys
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import os
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# UTILITIES FOR WRITING PYTHON SOURCECODE TO A FILE
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# ByteWriter takes as input a variable name and data values and writes
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# Python source to an output stream of the form
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# my_variable = b'\x01\x02\x03\x04\x05\x06\x07\x08'\
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# Lines are broken with \ for readability.
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class ByteWriter(object):
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bytes_per_line = 8
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def __init__(self, stream, varname):
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self.stream = stream
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self.stream.write(''.join((varname, ' = ')))
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self.bytecount = 0 # For line breaks
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self.total_bytes = 0
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def _eol(self):
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self.stream.write("'\\\n")
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def _eot(self):
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self.stream.write("'\n")
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def _bol(self):
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self.stream.write("b'")
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# Output a single byte
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def obyte(self, data):
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if not self.bytecount:
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self._bol()
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self.stream.write('\\x{:02x}'.format(data))
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self.total_bytes += 1
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self.bytecount += 1
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self.bytecount %= self.bytes_per_line
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if not self.bytecount:
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self._eol()
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# Output from a sequence
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def odata(self, bytelist):
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for b in bytelist:
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self.obyte(b)
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# Output words of arbitrary length litle-endian
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def owords(self, words, length=2):
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for data in words:
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for _ in range(length):
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self.obyte(data & 0xff)
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data >>= 8
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# ensure a correct final line
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def eot(self): # User force EOL if one hasn't occurred
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if self.bytecount:
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self._eot()
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self.stream.write('\n')
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def bytes_written(self):
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return self.total_bytes
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# Define a global
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def var_write(stream, name, value):
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stream.write('{} = {}\n'.format(name, value))
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# FONT HANDLING
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class Bitmap(object):
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"""
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A 2D bitmap image represented as a list of byte values. Each byte indicates
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the state of a single pixel in the bitmap. A value of 0 indicates that the
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pixel is `off` and any other value indicates that it is `on`.
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"""
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def __init__(self, width, height, pixels=None):
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self.width = width
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self.height = height
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self.pixels = pixels or bytearray(width * height)
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def display(self):
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"""Print the bitmap's pixels."""
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for y in range(self.height):
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for x in range(self.width):
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ch = '#' if self.pixels[y * self.width + x] else '.'
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print(ch, end='')
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print()
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print()
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def bitblt(self, src, y):
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"""Copy all pixels from `src` into this bitmap"""
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srcpixel = 0
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dstpixel = y * self.width
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row_offset = self.width - src.width
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for sy in range(src.height):
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for sx in range(src.width):
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self.pixels[dstpixel] = src.pixels[srcpixel]
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srcpixel += 1
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dstpixel += 1
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dstpixel += row_offset
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# Horizontal mapping generator function
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def get_hbyte(self, reverse):
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for y in range(self.height):
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x = 0
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while True:
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bit = x % 8
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if bit == 0:
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if x >= self.width:
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break
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byte = 0
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if x < self.width:
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if reverse:
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byte |= self.pixels[y * self.width + x] << bit
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else:
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# Normal map MSB of byte 0 is (0, 0)
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byte |= self.pixels[y * self.width + x] << (7 - bit)
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if bit == 7:
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yield byte
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x += 1
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# Vertical mapping
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def get_vbyte(self, reverse):
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for x in range(self.width):
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y = 0
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while True:
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bit = y % 8
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if bit == 0:
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if y >= self.height:
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break
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byte = 0
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if y < self.height:
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if reverse:
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byte |= self.pixels[y * self.width + x] << (7 - bit)
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else:
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# Normal map MSB of byte 0 is (0, 7)
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byte |= self.pixels[y * self.width + x] << bit
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if bit == 7:
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yield byte
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y += 1
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class Glyph(object):
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def __init__(self, pixels, width, height, top, advance_width):
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self.bitmap = Bitmap(width, height, pixels)
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# The glyph bitmap's top-side bearing, i.e. the vertical distance from
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# the baseline to the bitmap's top-most scanline.
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self.top = top
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# Ascent and descent determine how many pixels the glyph extends
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# above or below the baseline.
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self.descent = max(0, self.height - self.top)
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self.ascent = max(0, max(self.top, self.height) - self.descent)
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# The advance width determines where to place the next character
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# horizontally, that is, how many pixels we move to the right to
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# draw the next glyph.
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self.advance_width = advance_width
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@property
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def width(self):
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return self.bitmap.width
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@property
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def height(self):
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return self.bitmap.height
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@staticmethod
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def from_glyphslot(slot):
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"""Construct and return a Glyph object from a FreeType GlyphSlot."""
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pixels = Glyph.unpack_mono_bitmap(slot.bitmap)
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width, height = slot.bitmap.width, slot.bitmap.rows
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top = slot.bitmap_top
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# The advance width is given in FreeType's 26.6 fixed point format,
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# which means that the pixel values are multiples of 64.
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advance_width = slot.advance.x / 64
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return Glyph(pixels, width, height, top, advance_width)
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@staticmethod
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def unpack_mono_bitmap(bitmap):
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"""
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Unpack a freetype FT_LOAD_TARGET_MONO glyph bitmap into a bytearray
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where each pixel is represented by a single byte.
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"""
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# Allocate a bytearray of sufficient size to hold the glyph bitmap.
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data = bytearray(bitmap.rows * bitmap.width)
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# Iterate over every byte in the glyph bitmap. Note that we're not
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# iterating over every pixel in the resulting unpacked bitmap --
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# we're iterating over the packed bytes in the input bitmap.
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for y in range(bitmap.rows):
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for byte_index in range(bitmap.pitch):
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# Read the byte that contains the packed pixel data.
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byte_value = bitmap.buffer[y * bitmap.pitch + byte_index]
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# We've processed this many bits (=pixels) so far. This
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# determines where we'll read the next batch of pixels from.
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num_bits_done = byte_index * 8
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# Pre-compute where to write the pixels that we're going
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# to unpack from the current byte in the glyph bitmap.
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rowstart = y * bitmap.width + byte_index * 8
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# Iterate over every bit (=pixel) that's still a part of the
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# output bitmap. Sometimes we're only unpacking a fraction of
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# a byte because glyphs may not always fit on a byte boundary.
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# So we make sure to stop if we unpack past the current row
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# of pixels.
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for bit_index in range(min(8, bitmap.width - num_bits_done)):
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# Unpack the next pixel from the current glyph byte.
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bit = byte_value & (1 << (7 - bit_index))
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# Write the pixel to the output bytearray. We ensure that
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# `off` pixels have a value of 0 and `on` pixels have a
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# value of 1.
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data[rowstart + bit_index] = 1 if bit else 0
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return data
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# A Font object is a dictionary of ASCII chars indexed by a character e.g.
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# myfont['a']
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# Each entry comprises a list
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# [0] A Bitmap instance containing the character
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# [1] The width of the character data including advance (actual data stored)
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# Public attributes:
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# height (in pixels) of all characters
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# width (in pixels) for monospaced output (advance width of widest char)
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class Font(dict):
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charset = [chr(x) for x in range(32, 127)]
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def __init__(self, filename, size, monospaced=False):
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self._face = freetype.Face(filename)
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self._face.set_pixel_sizes(0, size)
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self._max_descent = 0
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# For each character in the charset string we get the glyph
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# and update the overall dimensions of the resulting bitmap.
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max_width = 0
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max_ascent = 0
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for char in self.charset:
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glyph = self._glyph_for_character(char)
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max_ascent = max(max_ascent, int(glyph.ascent))
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self._max_descent = max(self._max_descent, int(glyph.descent))
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# for a few chars e.g. _ glyph.width > glyph.advance_width
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max_width = int(max(max_width, glyph.advance_width, glyph.width))
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self.height = max_ascent + self._max_descent
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self.width = max_width if monospaced else 0
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for char in self.charset:
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self._render_char(char)
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def _glyph_for_character(self, char):
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# Let FreeType load the glyph for the given character and tell it to
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# render a monochromatic bitmap representation.
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self._face.load_char(char, freetype.FT_LOAD_RENDER |
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freetype.FT_LOAD_TARGET_MONO)
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return Glyph.from_glyphslot(self._face.glyph)
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def _render_char(self, char):
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glyph = self._glyph_for_character(char)
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if self.width: # Monospaced
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width = self.width
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else:
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width = int(max(glyph.width, glyph.advance_width))
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outbuffer = Bitmap(width, self.height)
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# The vertical drawing position should place the glyph
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# on the baseline as intended.
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y = self.height - int(glyph.ascent) - self._max_descent
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outbuffer.bitblt(glyph.bitmap, y)
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self[char] = [outbuffer, width]
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def _stream_char(self, char, hmap, reverse):
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outbuffer, width = self[char]
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if hmap:
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gen = outbuffer.get_hbyte(reverse)
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else:
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gen = outbuffer.get_vbyte(reverse)
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yield from gen
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def build_arrays(self, hmap, reverse):
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data = bytearray()
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index = bytearray((0, 0))
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for char in self.charset:
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width = self[char][1]
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data += (width).to_bytes(2, byteorder='little')
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data += bytearray(self._stream_char(char, hmap, reverse))
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index += (len(data)).to_bytes(2, byteorder='little')
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return data, index
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# PYTHON FILE WRITING
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str01 = """# Code generated by font-to-py.py.
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# Font: {}
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version = '0.1'
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"""
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str02 = """
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from uctypes import addressof
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def _chr_addr(ordch):
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offset = 2 * (ordch - 32)
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return int.from_bytes(_index[offset:offset + 2], 'little')
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def get_ch(ch):
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ordch = ord(ch)
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||||||
|
ordch = ordch if ordch >= 32 and ordch <= 126 else ord('?')
|
||||||
|
offset = _chr_addr(ordch)
|
||||||
|
width = int.from_bytes(_font[offset:offset + 2], 'little')
|
||||||
|
return addressof(_font) + offset + 2, height, width
|
||||||
|
|
||||||
|
"""
|
||||||
|
|
||||||
|
# Test mode get_ch returns a slice rather than an address
|
||||||
|
str03 = """
|
||||||
|
def _chr_addr(ordch):
|
||||||
|
offset = 2 * (ordch - 32)
|
||||||
|
return int.from_bytes(_index[offset:offset + 2], 'little')
|
||||||
|
|
||||||
|
def get_ch(ch):
|
||||||
|
ordch = ord(ch)
|
||||||
|
ordch = ordch if ordch >= 32 and ordch <= 126 else ord('?')
|
||||||
|
offset = _chr_addr(ordch)
|
||||||
|
width = int.from_bytes(_font[offset:offset + 2], 'little')
|
||||||
|
next_offs = _chr_addr(ordch +1)
|
||||||
|
return _font[offset + 2:next_offs], height, width
|
||||||
|
|
||||||
|
"""
|
||||||
|
|
||||||
|
|
||||||
|
def write_font(op_path, font_path, height, monospaced, hmap, reverse, test):
|
||||||
|
try:
|
||||||
|
fnt = Font(font_path, height, monospaced)
|
||||||
|
except freetype.ft_errors.FT_Exception:
|
||||||
|
print("Can't open", font_path)
|
||||||
|
return False
|
||||||
|
try:
|
||||||
|
with open(op_path, 'w') as stream:
|
||||||
|
write_data(stream, fnt, font_path, height,
|
||||||
|
monospaced, hmap, reverse, test)
|
||||||
|
except OSError:
|
||||||
|
print("Can't open", op_path, 'for writing')
|
||||||
|
return False
|
||||||
|
return True
|
||||||
|
|
||||||
|
|
||||||
|
def write_data(stream, fnt, font_path, height,
|
||||||
|
monospaced, hmap, reverse, test):
|
||||||
|
stream.write(str01.format(os.path.split(font_path)[1]))
|
||||||
|
var_write(stream, 'test', test)
|
||||||
|
var_write(stream, 'height', height)
|
||||||
|
var_write(stream, 'width', fnt.width)
|
||||||
|
var_write(stream, 'vmap', not hmap)
|
||||||
|
var_write(stream, 'reversed', reverse)
|
||||||
|
data, index = fnt.build_arrays(hmap, reverse)
|
||||||
|
bw_font = ByteWriter(stream, '_font')
|
||||||
|
bw_font.odata(data)
|
||||||
|
bw_font.eot()
|
||||||
|
bw_index = ByteWriter(stream, '_index')
|
||||||
|
bw_index.odata(index)
|
||||||
|
bw_index.eot()
|
||||||
|
strfinal = str03 if test else str02
|
||||||
|
stream.write(strfinal)
|
||||||
|
|
||||||
|
|
||||||
|
# ******************* TESTS *******************
|
||||||
|
|
||||||
|
def display_hmap(ba, height, width, reverse):
|
||||||
|
bytes_per_row = width // 8 + 1
|
||||||
|
for bitnum in range(height * width):
|
||||||
|
row, bn = divmod(bitnum, width)
|
||||||
|
if bn == 0:
|
||||||
|
print()
|
||||||
|
byte = ba[row * bytes_per_row + bn // 8]
|
||||||
|
if reverse:
|
||||||
|
bit = (byte & (1 << (bn % 8))) > 0
|
||||||
|
else:
|
||||||
|
bit = (byte & (1 << (7 - (bn % 8)))) > 0
|
||||||
|
ch = '#' if bit else '.'
|
||||||
|
print(ch, end='')
|
||||||
|
print()
|
||||||
|
print(height, width)
|
||||||
|
|
||||||
|
|
||||||
|
def display_vmap(ba, height, width, reverse):
|
||||||
|
bytes_per_col = height // 8 + 1
|
||||||
|
for row in range(height):
|
||||||
|
for col in range(width):
|
||||||
|
byte = ba[col * bytes_per_col + row // 8]
|
||||||
|
if reverse:
|
||||||
|
bit = (byte & (1 << (7 - (row % 8)))) > 0
|
||||||
|
else:
|
||||||
|
bit = (byte & (1 << (row % 8))) > 0
|
||||||
|
ch = '#' if bit else '.'
|
||||||
|
print(ch, end='')
|
||||||
|
print()
|
||||||
|
print(height, width)
|
||||||
|
|
||||||
|
|
||||||
|
def display(g, hmap, height, width, reverse):
|
||||||
|
if hmap:
|
||||||
|
display_hmap(g, height, width, reverse)
|
||||||
|
else:
|
||||||
|
display_vmap(g, height, width, reverse)
|
||||||
|
|
||||||
|
|
||||||
|
def test1(string, height, monospaced, hmap, reverse):
|
||||||
|
fnt = Font("FreeSans.ttf", height, monospaced)
|
||||||
|
height = fnt.height
|
||||||
|
for char in string:
|
||||||
|
width = fnt[char][1]
|
||||||
|
g = bytearray(fnt._stream_char(char, hmap, reverse))
|
||||||
|
display(g, hmap, height, width, reverse)
|
||||||
|
|
||||||
|
|
||||||
|
def chr_addr(index, ordch):
|
||||||
|
offset = 2 * (ordch - 32)
|
||||||
|
return int.from_bytes(index[offset:offset + 2], 'little')
|
||||||
|
|
||||||
|
|
||||||
|
def test(string, height, monospaced, hmap, reverse):
|
||||||
|
fnt = Font("FreeSans.ttf", height, monospaced)
|
||||||
|
height = fnt.height
|
||||||
|
data, index = fnt.build_arrays(hmap, reverse)
|
||||||
|
for char in string:
|
||||||
|
ordch = ord(char)
|
||||||
|
offset = chr_addr(index, ordch)
|
||||||
|
width = int.from_bytes(data[offset:offset + 2], 'little')
|
||||||
|
offset += 2
|
||||||
|
next_offs = chr_addr(index, ordch + 1)
|
||||||
|
display(data[offset:next_offs], hmap, height, width, reverse)
|
||||||
|
|
||||||
|
|
||||||
|
# usage testfile('FreeSans','xyz')
|
||||||
|
def testfile(fontfile, string):
|
||||||
|
import importlib
|
||||||
|
myfont = importlib.import_module(fontfile)
|
||||||
|
for ch in string:
|
||||||
|
data, height, width = myfont.get_ch(ch)
|
||||||
|
display(data, not myfont.vmap, height, width, myfont.reversed)
|
||||||
|
|
||||||
|
|
||||||
|
def bar():
|
||||||
|
# Number indicates height, in practice can be one less i.e. 36->35 rows
|
||||||
|
fnt = Font("FreeSans.ttf", 20)
|
||||||
|
for ch in 'WM_eg!.,':
|
||||||
|
fnt[ch][0].display()
|
||||||
|
print(fnt.width)
|
||||||
|
|
||||||
|
# test('|_g.AW', height = 20, monospaced = True, hmap = False, reverse = False)
|
||||||
|
|
||||||
|
# PARSE COMMAND LINE ARGUMENTS
|
||||||
|
|
||||||
|
desc = """font_to_py.py
|
||||||
|
Utility to convert ttf or otf font files to Python source.
|
||||||
|
Sample usage:
|
||||||
|
font_to_py.py FreeSans.ttf 23 freesans.py
|
||||||
|
This creates a font with nominal height 23 pixels. To specify monospaced
|
||||||
|
rendering issue
|
||||||
|
font_to_py.py FreeSans.ttf 23 --fixed freesans.py
|
||||||
|
"""
|
||||||
|
|
||||||
|
if __name__ == "__main__":
|
||||||
|
parser = argparse.ArgumentParser(__file__, description=desc,
|
||||||
|
formatter_class=argparse.RawDescriptionHelpFormatter)
|
||||||
|
parser.add_argument('infile', type=str, help='input file path')
|
||||||
|
parser.add_argument('height', type=int, help='font height in pixels')
|
||||||
|
parser.add_argument('-x', '--xmap', action='store_true',
|
||||||
|
help='horizontal (x) mapping')
|
||||||
|
parser.add_argument('-r', '--reverse', action='store_true',
|
||||||
|
help='bit reversal')
|
||||||
|
parser.add_argument('-f', '--fixed', action='store_true',
|
||||||
|
help='Fixed width (monospaced) font')
|
||||||
|
parser.add_argument('-t', '--test', action='store_true',
|
||||||
|
help='Test file: import from cPython')
|
||||||
|
parser.add_argument('outfile', type=str,
|
||||||
|
help='Path and name of output file')
|
||||||
|
args = parser.parse_args()
|
||||||
|
if not args.infile[0].isalpha():
|
||||||
|
print('Font filenames must be valid Python variable names.')
|
||||||
|
sys.exit(1)
|
||||||
|
if not os.path.isfile(args.infile):
|
||||||
|
print("Font filename does not exist")
|
||||||
|
sys.exit(1)
|
||||||
|
if not os.path.splitext(args.infile)[1].upper() in ('.TTF', '.OTF'):
|
||||||
|
print("Font file should be a ttf or otf file.")
|
||||||
|
sys.exit(1)
|
||||||
|
if not os.path.splitext(args.outfile)[1].upper() == '.PY':
|
||||||
|
print("Output filename should have a .py extension.")
|
||||||
|
sys.exit(1)
|
||||||
|
print(args.infile, args.outfile, args.reverse, args.xmap)
|
||||||
|
if not write_font(args.outfile, args.infile, args.height, args.fixed,
|
||||||
|
args.xmap, args.reverse, args.test):
|
||||||
|
sys.exit(1)
|
Ładowanie…
Reference in New Issue