160 lines
4.9 KiB
Python
Executable File
160 lines
4.9 KiB
Python
Executable File
#!/usr/bin/env python3
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# converts Hershey fonts into a format easier to consume by the Badger2040
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# e-ink badge library - the result can be piped directly into a .hpp file.
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import argparse
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from pathlib import Path
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parser = argparse.ArgumentParser(
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description="Converts Hershey fonts into the format used by Badger2040."
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)
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parser.add_argument("file", nargs="+", help="input files to convert")
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options = parser.parse_args()
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def convert_font(data):
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# parse hershey font data file, the file format contains one record per
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# character with the format:
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#
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# 2761 8MXP[OZPYQZQ[P]N_
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#
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# first 5 characters: represent the character id (or a dummy value
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# of 12345). if it is a character id then a separate file contains the
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# mapping information to convert that into an ascii table entry. if all of
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# the ids are 12345 then it seems that the files contain 95 entries that
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# start from ascii character 32 (space) in order
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#
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# next 3 characters: number of vertices (including special left/right
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# bounds value)
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#
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# next 2 characters: represent the "left" and "right" offsets for this
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# character, to convert you must subtract 'R' from them. this pair counts
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# as the first "vertex"
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#
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# subsequent pairs of characters: represent each vertex, as before converted
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# into numbers by subtracting 'R'. there are vertex count (-1) of these
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#
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# note! within the vertex data can be extra newline characters which must
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# be ignored.
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vertex_data = []
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char_data = {}
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auto_char_code = 0
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# we'll loop, extracting one character per iteration, until all of the
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# data is consumed
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while len(data) > 0:
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char_code = auto_char_code
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auto_char_code += 1
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# extract vertex count
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vertex_count = int(data[5:8])
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vertex_count -= 1 # remove one for the bounds data
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# extract bounds
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left = ord(data[8:9]) - ord("R")
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right = ord(data[9:10]) - ord("R")
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char_data[char_code] = {
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"width": right - left,
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"vertex_count": vertex_count,
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"first_vertex_offset": len(vertex_data),
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}
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# work out expected total length of character data
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char_data_len = 10 + (vertex_count * 2)
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# if there are any newlines within this data then remove them before we
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# move on the parse the vertices
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while data.find("\n", char_data_len) != -1:
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data = data.replace("\n", "", 1)
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for i in range(0, vertex_count):
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offset = 10 + (i * 2)
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if data[offset:offset + 2] == " R":
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# pen up for one
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x = -128
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y = -128
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else:
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x = ord(data[offset + 0:offset + 1]) - ord("R") - left
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y = ord(data[offset + 1:offset + 2]) - ord("R")
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vertex_data.append(str(x))
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vertex_data.append(str(y))
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data = data[char_data_len:]
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font_name = Path(input_filename).stem
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# create code for all of the vertices
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vertex_code = """\
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static const int8_t {font_name}_vertices[{count}] = {{
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{vertices}
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}};
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""".format(
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font_name=font_name, count=len(vertex_data), vertices=", ".join(vertex_data)
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)
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# create code for chars and font
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#
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# struct hershey_font_glyph_t {
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# uint32_t width; // character width
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# uint32_t vertex_count; // number of vertices
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# int8_t *vertices; // vertex data (indices: even = x, odd = y)
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# };
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chars = []
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for i in range(0, 95):
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if i in char_data:
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chars.append(
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" {{.width={width}, .vertex_count={vertex_count}, .vertices=&{font_name}_vertices[{offset}]}}".format(
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width=char_data[i]["width"],
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vertex_count=char_data[i]["vertex_count"],
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font_name=font_name,
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offset=char_data[i]["first_vertex_offset"],
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)
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)
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else:
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chars.append(" {.width=0, .vertex_count=0, .vertices=nullptr}")
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# struct hershey_font_t {
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# hershey_font_glyph_t chars[95];
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# };
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font_code = """\
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static const hershey_font_t {font_name} {{
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.chars = {{
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{chars}
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}}
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}};
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""".format(
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font_name=font_name, chars=",\n".join(chars)
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)
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print(vertex_code)
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print(font_code)
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return """ {{ \"{font_name}\", &{font_name} }}""".format(font_name=font_name)
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# create map of font name to font structure
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font_list = []
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for input_filename in options.file:
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input_file = open(input_filename, mode="r")
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data = input_file.read()
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input_file.close()
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font_list.append(convert_font(data))
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map_code = """\
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std::map<std::string, const hershey_font_t*> fonts = {{
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{font_list}
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}};
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""".format(
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font_list=",\n".join(font_list)
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)
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print(map_code)
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