238 lines
7.6 KiB
Python
238 lines
7.6 KiB
Python
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#!python3
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import freetype
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import zlib
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import sys
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import re
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import math
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import argparse
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from collections import namedtuple
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# From: https://github.com/vroland/epdiy
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parser = argparse.ArgumentParser(description="Generate a header file from a font to be used with epdiy.")
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parser.add_argument("name", action="store", help="name of the font.")
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parser.add_argument("size", type=int, help="font size to use.")
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parser.add_argument("fontstack", action="store", nargs='+', help="list of font files, ordered by descending priority.")
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parser.add_argument("--compress", dest="compress", action="store_true", help="compress glyph bitmaps.")
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parser.add_argument("--additional-intervals", dest="additional_intervals", action="append", help="Additional code point intervals to export as min,max. This argument can be repeated.")
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args = parser.parse_args()
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GlyphProps = namedtuple("GlyphProps", ["width", "height", "advance_x", "left", "top", "compressed_size", "data_offset", "code_point"])
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font_stack = [freetype.Face(f) for f in args.fontstack]
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compress = args.compress
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size = args.size
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font_name = args.name
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# inclusive unicode code point intervals
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# must not overlap and be in ascending order
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intervals = [
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### Basic Latin ###
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# ASCII letters, digits, punctuation, control characters
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(0x0000, 0x007F),
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### Latin-1 Supplement ###
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# Accented characters for Western European languages
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(0x0080, 0x00FF),
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### Latin Extended-A ###
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# Eastern European and Baltic languages
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(0x0100, 0x017F),
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### General Punctuation (core subset) ###
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# Smart quotes, en dash, em dash, ellipsis, NO-BREAK SPACE
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(0x2000, 0x206F),
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### Basic Symbols From "Latin-1 + Misc" ###
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# dashes, quotes, prime marks
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(0x2010, 0x203A),
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# misc punctuation
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(0x2040, 0x205F),
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# common currency symbols
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(0x20A0, 0x20CF),
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### Combining Diacritical Marks (minimal subset) ###
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# Needed for proper rendering of many extended Latin languages
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(0x0300, 0x036F),
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### Greek & Coptic ###
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# Used in science, maths, philosophy, some academic texts
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# (0x0370, 0x03FF),
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### Cyrillic ###
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# Russian, Ukrainian, Bulgarian, etc.
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# (0x0400, 0x04FF),
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### Math Symbols (common subset) ###
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# General math operators
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(0x2200, 0x22FF),
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# Arrows
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(0x2190, 0x21FF),
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### CJK ###
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# Core Unified Ideographs
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# (0x4E00, 0x9FFF),
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# # Extension A
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# (0x3400, 0x4DBF),
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# # Extension B
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# (0x20000, 0x2A6DF),
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# # Extension C–F
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# (0x2A700, 0x2EBEF),
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# # Extension G
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# (0x30000, 0x3134F),
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# # Hiragana
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# (0x3040, 0x309F),
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# # Katakana
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# (0x30A0, 0x30FF),
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# # Katakana Phonetic Extensions
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# (0x31F0, 0x31FF),
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# # Halfwidth Katakana
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# (0xFF60, 0xFF9F),
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# # Hangul Syllables
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# (0xAC00, 0xD7AF),
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# # Hangul Jamo
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# (0x1100, 0x11FF),
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# # Hangul Compatibility Jamo
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# (0x3130, 0x318F),
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# # Hangul Jamo Extended-A
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# (0xA960, 0xA97F),
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# # Hangul Jamo Extended-B
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# (0xD7B0, 0xD7FF),
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# # CJK Radicals Supplement
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# (0x2E80, 0x2EFF),
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# # Kangxi Radicals
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# (0x2F00, 0x2FDF),
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# # CJK Symbols and Punctuation
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# (0x3000, 0x303F),
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# # CJK Compatibility Forms
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# (0xFE30, 0xFE4F),
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# # CJK Compatibility Ideographs
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# (0xF900, 0xFAFF),
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]
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add_ints = []
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if args.additional_intervals:
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add_ints = [tuple([int(n, base=0) for n in i.split(",")]) for i in args.additional_intervals]
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def norm_floor(val):
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return int(math.floor(val / (1 << 6)))
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def norm_ceil(val):
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return int(math.ceil(val / (1 << 6)))
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def chunks(l, n):
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for i in range(0, len(l), n):
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yield l[i:i + n]
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def load_glyph(code_point):
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face_index = 0
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while face_index < len(font_stack):
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face = font_stack[face_index]
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glyph_index = face.get_char_index(code_point)
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if glyph_index > 0:
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face.load_glyph(glyph_index, freetype.FT_LOAD_RENDER)
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return face
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face_index += 1
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print(f"code point {code_point} ({hex(code_point)}) not found in font stack!", file=sys.stderr)
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return None
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unmerged_intervals = sorted(intervals + add_ints)
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intervals = []
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unvalidated_intervals = []
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for i_start, i_end in unmerged_intervals:
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if len(unvalidated_intervals) > 0 and i_start + 1 <= unvalidated_intervals[-1][1]:
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unvalidated_intervals[-1] = (unvalidated_intervals[-1][0], max(unvalidated_intervals[-1][1], i_end))
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continue
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unvalidated_intervals.append((i_start, i_end))
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for i_start, i_end in unvalidated_intervals:
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start = i_start
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for code_point in range(i_start, i_end + 1):
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face = load_glyph(code_point)
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if face is None:
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if start < code_point:
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intervals.append((start, code_point - 1))
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start = code_point + 1
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if start != i_end + 1:
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intervals.append((start, i_end))
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for face in font_stack:
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# shift by 6 bytes, because sizes are given as 6-bit fractions
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# the display has about 150 dpi.
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face.set_char_size(size << 6, size << 6, 150, 150)
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total_size = 0
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total_packed = 0
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all_glyphs = []
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for i_start, i_end in intervals:
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for code_point in range(i_start, i_end + 1):
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face = load_glyph(code_point)
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bitmap = face.glyph.bitmap
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pixels = []
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px = 0
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for i, v in enumerate(bitmap.buffer):
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y = i / bitmap.width
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x = i % bitmap.width
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if x % 2 == 0:
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px = (v >> 4)
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else:
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px = px | (v & 0xF0)
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pixels.append(px);
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px = 0
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# eol
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if x == bitmap.width - 1 and bitmap.width % 2 > 0:
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pixels.append(px)
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px = 0
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packed = bytes(pixels);
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total_packed += len(packed)
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compressed = packed
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if compress:
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compressed = zlib.compress(packed)
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glyph = GlyphProps(
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width = bitmap.width,
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height = bitmap.rows,
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advance_x = norm_floor(face.glyph.advance.x),
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left = face.glyph.bitmap_left,
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top = face.glyph.bitmap_top,
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compressed_size = len(compressed),
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data_offset = total_size,
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code_point = code_point,
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)
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total_size += len(compressed)
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all_glyphs.append((glyph, compressed))
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# pipe seems to be a good heuristic for the "real" descender
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face = load_glyph(ord('|'))
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glyph_data = []
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glyph_props = []
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for index, glyph in enumerate(all_glyphs):
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props, compressed = glyph
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glyph_data.extend([b for b in compressed])
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glyph_props.append(props)
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print(f"/**\n * generated by fontconvert.py\n * name: {font_name}\n * size: {size}\n * compressed: {compress}\n */")
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print("#pragma once")
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print("#include \"EpdFontData.h\"\n")
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print(f"static const uint8_t {font_name}Bitmaps[{len(glyph_data)}] = {{")
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for c in chunks(glyph_data, 16):
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print (" " + " ".join(f"0x{b:02X}," for b in c))
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print ("};\n");
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print(f"static const EpdGlyph {font_name}Glyphs[] = {{")
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for i, g in enumerate(glyph_props):
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print (" { " + ", ".join([f"{a}" for a in list(g[:-1])]),"},", f"// {chr(g.code_point) if g.code_point != 92 else '<backslash>'}")
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print ("};\n");
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print(f"static const EpdUnicodeInterval {font_name}Intervals[] = {{")
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offset = 0
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for i_start, i_end in intervals:
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print (f" {{ 0x{i_start:X}, 0x{i_end:X}, 0x{offset:X} }},")
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offset += i_end - i_start + 1
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print ("};\n");
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print(f"static const EpdFontData {font_name} = {{")
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print(f" {font_name}Bitmaps,")
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print(f" {font_name}Glyphs,")
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print(f" {font_name}Intervals,")
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print(f" {len(intervals)},")
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print(f" {1 if compress else 0},")
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print(f" {norm_ceil(face.size.height)},")
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print(f" {norm_ceil(face.size.ascender)},")
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print(f" {norm_floor(face.size.descender)},")
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print("};")
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