kopia lustrzana https://github.com/russhughes/st7789py_mpy
403 wiersze
14 KiB
Python
403 wiersze
14 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# Needs freetype-py>=1.0
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# Font handling classes are from Dan Bader blog post on using freetype
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# http://dbader.org/blog/monochrome-font-rendering-with-freetype-and-python
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#
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# Modified by Russ Hughes, Mar 2021 to write bitmap modules compatible with
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# the MicroPython ili9342c driver at https://github.com/russhughes/ili9342c_mpy
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# and the st7789 driver at https://github.com/russhughes/st7789_mpy.
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#
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# The Negative glyph.left fix is from peterhinch's font conversion program
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# https://github.com/peterhinch/micropython-font-to-py
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# https://github.com/peterhinch/micropython-font-to-py/issues/21
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# Handle negative glyph.left correctly (capital J),
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# also glyph.width > advance (capital K and R).
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#
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# The MIT License (MIT)
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#
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# Copyright (c) 2013 Daniel Bader (http://dbader.org)
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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 sys
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import shlex
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import argparse
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import bisect
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import freetype
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def to_int(str):
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return int(str, base=16) if str.startswith("0x") else int(str)
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def get_chars(str):
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return ''.join([chr(b) for a in [
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(lambda sub: range(sub[0], sub[-1] + 1))
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(list(map(to_int, ele.split('-'))))
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for ele in str.split(',')]
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for b in a])
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def wrap_list(lst, items_per_line=8):
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lines = []
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for i in range(0, len(lst), items_per_line):
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chunk = lst[i:i + items_per_line]
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line = ", ".join("0x{:02x}".format(x) for x in chunk)
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lines.append(line)
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return "[\n " + ",\n ".join(lines) + "]"
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def wrap_bytes(lst, items_per_line=16):
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lines = []
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for i in range(0, len(lst), items_per_line):
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chunk = lst[i:i + items_per_line]
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line = "".join("\\x{:02x}".format(x) for x in chunk)
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lines.append(line)
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return " b'" + "'\\\n b'".join(lines) + "'"
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def wrap_longs(lst, items_per_line=16):
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lines = []
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for i in range(0, len(lst), items_per_line):
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chunk = lst[i:i + items_per_line]
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line = "".join("\\x{:02x}".format(x) for x in chunk)
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lines.append(line)
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return " b'" + "'\\\n b'".join(lines) + "'"
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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 = int(width)
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self.height = int(height)
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self.pixels = pixels or bytearray(width * height)
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def __repr__(self):
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"""Return a string representation of the bitmap's pixels."""
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rows = ''
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for y in range(self.height):
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for x in range(self.width):
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rows += '#' if self.pixels[y * self.width + x] else '.'
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rows += '\n'
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return rows
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def bit_string(self):
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"""Return a binary string representation of the bitmap's pixels."""
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bits = ''
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for y in range(self.height):
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for x in range(self.width):
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bits += '1' if self.pixels[y * self.width + x] else '0'
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return bits
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def bitblt(self, src, x, 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 + x
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row_offset = self.width - src.width
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for _ in range(src.height):
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for _ in range(src.width):
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# Perform an OR operation on the destination pixel and the
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# source pixel because glyph bitmaps may overlap if character
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# kerning is applied, e.g. in the string "AVA", the "A" and "V"
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# glyphs must be rendered with overlapping bounding boxes.
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self.pixels[dstpixel] = (
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self.pixels[dstpixel] or 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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class Glyph(object):
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def __init__(self, pixels, width, height, top, left, 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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self.left = left
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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 draw
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# 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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left = slot.bitmap_left
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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, left, 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 a
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# byte because glyphs may not always fit on a byte boundary. So
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# we make sure to stop if we unpack past the current row of
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# 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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class Font(object):
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def __init__(self, filename, width, height):
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self.face = freetype.Face(filename)
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self.face.set_pixel_sizes(width, height)
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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(
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char, freetype.FT_LOAD_RENDER | freetype.FT_LOAD_TARGET_MONO)
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return Glyph.from_glyphslot(self.face.glyph)
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def render_character(self, char):
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glyph = self.glyph_for_character(char)
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return glyph.bitmap
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def text_dimensions(self, text):
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"""
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Return (width, height, baseline) of `text` rendered in the current
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font.
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"""
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width = 0
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max_ascent = 0
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max_descent = 0
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# For each character in the text string we get the glyph
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# and update the overall dimensions of the resulting bitmap.
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for char in text:
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glyph = self.glyph_for_character(char)
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max_ascent = max(max_ascent, glyph.ascent)
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max_descent = max(max_descent, glyph.descent)
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if glyph.left >= 0:
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char_width = int(
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max(glyph.advance_width, glyph.width + glyph.left))
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else:
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char_width = int(
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max(glyph.advance_width - glyph.left, glyph.width))
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width += char_width
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height = max_ascent + max_descent
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return (width, height, max_descent)
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def write_python(self, text, font_file):
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"""
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Render the given `text` into a python bitmap module.
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"""
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_, height, baseline = self.text_dimensions(text)
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bits = []
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widths = []
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offsets = []
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offset = 0
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for char in text:
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glyph = self.glyph_for_character(char)
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# Negative glyph.left fix from peterhinch
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# https://github.com/peterhinch/micropython-font-to-py
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#
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# https://github.com/peterhinch/micropython-font-to-py/issues/21
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# Handle negative glyph.left correctly (capital J),
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# also glyph.width > advance (capital K and R).
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if glyph.left >= 0:
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char_width = int(
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max(glyph.advance_width, glyph.width + glyph.left))
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left = glyph.left
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else:
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char_width = int(
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max(glyph.advance_width - glyph.left, glyph.width))
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left = 0
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# save the bit offset and width of the current glyph
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offsets.append(offset)
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widths.append(char_width)
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outbuffer = Bitmap(char_width, 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 = height - glyph.ascent - baseline
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outbuffer.bitblt(glyph.bitmap, left, y)
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# convert bitmap to ascii bitmap string
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bit_string = outbuffer.bit_string()
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bits.append(bit_string)
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offset += len(bit_string)
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# join all the bitmap strings together
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bit_string = ''.join(bits)
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# escape '\' and '"' characters for char_map
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char_map = text.replace('\\', '\\\\').replace('"', '\\"')
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cmd_line = " ".join(map(shlex.quote, sys.argv))
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max_width = max(widths)
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# write python module source
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print('# -*- coding: utf-8 -*-')
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print(f'# Converted from {font_file} using:')
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print(f'# {cmd_line}')
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print()
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print(f'MAP = "{char_map}"')
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print('BPP = 1')
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print(f'HEIGHT = {height}')
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print(f'MAX_WIDTH = {max_width}')
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print('_WIDTHS = \\')
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print(wrap_bytes(widths))
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print()
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byte_offsets = bytearray()
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bytes_table = [0xff, 0xffff, 0xffffff, 0xffffffff]
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bytes_required = bisect.bisect_left(bytes_table, offset, 0, 3) + 1
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for offset in offsets:
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byte_offsets.extend(offset.to_bytes(bytes_required, 'big'))
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print(f'OFFSET_WIDTH = {bytes_required}')
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print('_OFFSETS = \\')
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print(wrap_longs(byte_offsets))
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print()
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print('_BITMAPS =\\')
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byte_values = []
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for i in range(0, len(bit_string), 8):
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byte_values.append(int(bit_string[i:i+8], 2))
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print(wrap_bytes(byte_values))
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print("\nWIDTHS = memoryview(_WIDTHS)")
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print("OFFSETS = memoryview(_OFFSETS)")
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print("BITMAPS = memoryview(_BITMAPS)")
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def main():
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parser = argparse.ArgumentParser(
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prog='font2bitmap',
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description=('''
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Convert characters from a truetype font to a python bitmap for use
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with the bitmap method in the st7789 and ili9342 drivers.'''))
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parser.add_argument(
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'font_file',
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help='name of font file to convert.')
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parser.add_argument(
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'font_height',
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type=int,
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default=8,
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help='size of font to create bitmaps from.')
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parser.add_argument(
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'-width', '--font_width',
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type=int,
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default=None,
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help='width of font to create bitmaps from.')
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group = parser.add_argument_group(
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'character selection',
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'characters from the font to include in the bitmap.')
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excl = group.add_mutually_exclusive_group(required=True)
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excl.add_argument(
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'-c', '--characters',
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help='''integer or hex character values and/or ranges to include.
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For example: "65, 66, 67" or "32-127" or "0x30-0x39, 0x41-0x5a"''')
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excl.add_argument(
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'-s', '--string',
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help='''string of characters to include
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For example: "1234567890-."''')
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args = parser.parse_args()
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font_file = args.font_file
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height = args.font_height
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width = args.font_height if args.font_width is None else args.font_width
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characters = (
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get_chars(args.characters) if args.string is None else args.string)
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fnt = Font(font_file, width, height)
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fnt.write_python(characters, font_file)
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main()
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