mirror of
https://github.com/daveallie/crosspoint-reader.git
synced 2026-02-05 23:27:38 +03:00
287 lines
11 KiB
Python
Executable File
287 lines
11 KiB
Python
Executable File
#!python3
|
|
import freetype
|
|
import zlib
|
|
import sys
|
|
import re
|
|
import math
|
|
import argparse
|
|
from collections import namedtuple
|
|
|
|
# Originally from https://github.com/vroland/epdiy
|
|
|
|
parser = argparse.ArgumentParser(description="Generate a header file from a font to be used with epdiy.")
|
|
parser.add_argument("name", action="store", help="name of the font.")
|
|
parser.add_argument("size", type=int, help="font size to use.")
|
|
parser.add_argument("fontstack", action="store", nargs='+', help="list of font files, ordered by descending priority.")
|
|
parser.add_argument("--2bit", dest="is2Bit", action="store_true", help="generate 2-bit greyscale bitmap instead of 1-bit black and white.")
|
|
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.")
|
|
parser.add_argument("--binary", dest="isBinary", action="store_true", help="output a binary .epdfont file instead of a C header.")
|
|
args = parser.parse_args()
|
|
|
|
GlyphProps = namedtuple("GlyphProps", ["width", "height", "advance_x", "left", "top", "data_length", "data_offset", "code_point"])
|
|
|
|
font_stack = [freetype.Face(f) for f in args.fontstack]
|
|
is2Bit = args.is2Bit
|
|
isBinary = args.isBinary
|
|
size = args.size
|
|
font_name = args.name
|
|
|
|
# inclusive unicode code point intervals
|
|
# must not overlap and be in ascending order
|
|
intervals = [
|
|
### Basic Latin ###
|
|
# ASCII letters, digits, punctuation, control characters
|
|
(0x0000, 0x007F),
|
|
### Latin-1 Supplement ###
|
|
# Accented characters for Western European languages
|
|
(0x0080, 0x00FF),
|
|
### Latin Extended-A ###
|
|
# Eastern European and Baltic languages
|
|
(0x0100, 0x017F),
|
|
### General Punctuation (core subset) ###
|
|
# Smart quotes, en dash, em dash, ellipsis, NO-BREAK SPACE
|
|
(0x2000, 0x206F),
|
|
### Basic Symbols From "Latin-1 + Misc" ###
|
|
# dashes, quotes, prime marks
|
|
(0x2010, 0x203A),
|
|
# misc punctuation
|
|
(0x2040, 0x205F),
|
|
# common currency symbols
|
|
(0x20A0, 0x20CF),
|
|
### Combining Diacritical Marks (minimal subset) ###
|
|
# Needed for proper rendering of many extended Latin languages
|
|
(0x0300, 0x036F),
|
|
### Greek & Coptic ###
|
|
# Used in science, maths, philosophy, some academic texts
|
|
# (0x0370, 0x03FF),
|
|
### Cyrillic ###
|
|
# Russian, Ukrainian, Bulgarian, etc.
|
|
(0x0400, 0x04FF),
|
|
### Math Symbols (common subset) ###
|
|
# General math operators
|
|
(0x2200, 0x22FF),
|
|
# Arrows
|
|
(0x2190, 0x21FF),
|
|
]
|
|
|
|
add_ints = []
|
|
if args.additional_intervals:
|
|
add_ints = [tuple([int(n, base=0) for n in i.split(",")]) for i in args.additional_intervals]
|
|
|
|
def norm_floor(val):
|
|
return int(math.floor(val / (1 << 6)))
|
|
|
|
def norm_ceil(val):
|
|
return int(math.ceil(val / (1 << 6)))
|
|
|
|
def chunks(l, n):
|
|
for i in range(0, len(l), n):
|
|
yield l[i:i + n]
|
|
|
|
def load_glyph(code_point):
|
|
face_index = 0
|
|
while face_index < len(font_stack):
|
|
face = font_stack[face_index]
|
|
glyph_index = face.get_char_index(code_point)
|
|
if glyph_index > 0:
|
|
face.load_glyph(glyph_index, freetype.FT_LOAD_RENDER)
|
|
return face
|
|
face_index += 1
|
|
print(f"code point {code_point} ({hex(code_point)}) not found in font stack!", file=sys.stderr)
|
|
return None
|
|
|
|
unmerged_intervals = sorted(intervals + add_ints)
|
|
intervals = []
|
|
unvalidated_intervals = []
|
|
for i_start, i_end in unmerged_intervals:
|
|
if len(unvalidated_intervals) > 0 and i_start + 1 <= unvalidated_intervals[-1][1]:
|
|
unvalidated_intervals[-1] = (unvalidated_intervals[-1][0], max(unvalidated_intervals[-1][1], i_end))
|
|
continue
|
|
unvalidated_intervals.append((i_start, i_end))
|
|
|
|
for i_start, i_end in unvalidated_intervals:
|
|
start = i_start
|
|
for code_point in range(i_start, i_end + 1):
|
|
face = load_glyph(code_point)
|
|
if face is None:
|
|
if start < code_point:
|
|
intervals.append((start, code_point - 1))
|
|
start = code_point + 1
|
|
if start != i_end + 1:
|
|
intervals.append((start, i_end))
|
|
|
|
for face in font_stack:
|
|
face.set_char_size(size << 6, size << 6, 150, 150)
|
|
|
|
total_size = 0
|
|
all_glyphs = []
|
|
|
|
for i_start, i_end in intervals:
|
|
for code_point in range(i_start, i_end + 1):
|
|
face = load_glyph(code_point)
|
|
bitmap = face.glyph.bitmap
|
|
|
|
# Build out 4-bit greyscale bitmap
|
|
pixels4g = []
|
|
px = 0
|
|
for i, v in enumerate(bitmap.buffer):
|
|
y = i / bitmap.width
|
|
x = i % bitmap.width
|
|
if x % 2 == 0:
|
|
px = (v >> 4)
|
|
else:
|
|
px = px | (v & 0xF0)
|
|
pixels4g.append(px);
|
|
px = 0
|
|
# eol
|
|
if x == bitmap.width - 1 and bitmap.width % 2 > 0:
|
|
pixels4g.append(px)
|
|
px = 0
|
|
|
|
if is2Bit:
|
|
# 0-3 white, 4-7 light grey, 8-11 dark grey, 12-15 black
|
|
# Downsample to 2-bit bitmap
|
|
pixels2b = []
|
|
px = 0
|
|
pitch = (bitmap.width // 2) + (bitmap.width % 2)
|
|
for y in range(bitmap.rows):
|
|
for x in range(bitmap.width):
|
|
px = px << 2
|
|
bm = pixels4g[y * pitch + (x // 2)]
|
|
bm = (bm >> ((x % 2) * 4)) & 0xF
|
|
|
|
if bm >= 12:
|
|
px += 3
|
|
elif bm >= 8:
|
|
px += 2
|
|
elif bm >= 4:
|
|
px += 1
|
|
|
|
if (y * bitmap.width + x) % 4 == 3:
|
|
pixels2b.append(px)
|
|
px = 0
|
|
if (bitmap.width * bitmap.rows) % 4 != 0:
|
|
px = px << (4 - (bitmap.width * bitmap.rows) % 4) * 2
|
|
pixels2b.append(px)
|
|
else:
|
|
# Downsample to 1-bit bitmap - treat any 2+ as black
|
|
pixelsbw = []
|
|
px = 0
|
|
pitch = (bitmap.width // 2) + (bitmap.width % 2)
|
|
for y in range(bitmap.rows):
|
|
for x in range(bitmap.width):
|
|
px = px << 1
|
|
bm = pixels4g[y * pitch + (x // 2)]
|
|
px += 1 if ((x & 1) == 0 and bm & 0xE > 0) or ((x & 1) == 1 and bm & 0xE0 > 0) else 0
|
|
|
|
if (y * bitmap.width + x) % 8 == 7:
|
|
pixelsbw.append(px)
|
|
px = 0
|
|
if (bitmap.width * bitmap.rows) % 8 != 0:
|
|
px = px << (8 - (bitmap.width * bitmap.rows) % 8)
|
|
pixelsbw.append(px)
|
|
|
|
pixels = pixels2b if is2Bit else pixelsbw
|
|
|
|
# Build output data
|
|
packed = bytes(pixels)
|
|
glyph = GlyphProps(
|
|
width = bitmap.width,
|
|
height = bitmap.rows,
|
|
advance_x = norm_floor(face.glyph.advance.x),
|
|
left = face.glyph.bitmap_left,
|
|
top = face.glyph.bitmap_top,
|
|
data_length = len(packed),
|
|
data_offset = total_size,
|
|
code_point = code_point,
|
|
)
|
|
total_size += len(packed)
|
|
all_glyphs.append((glyph, packed))
|
|
|
|
# pipe seems to be a good heuristic for the "real" descender
|
|
face = load_glyph(ord('|'))
|
|
|
|
glyph_data = []
|
|
glyph_props = []
|
|
for index, glyph in enumerate(all_glyphs):
|
|
props, packed = glyph
|
|
glyph_data.extend([b for b in packed])
|
|
glyph_props.append(props)
|
|
|
|
if isBinary:
|
|
import struct
|
|
with open(f"{font_name}.epdfont", "wb") as f:
|
|
# Magic
|
|
f.write(b"EPDF")
|
|
# Metrics (22 bytes)
|
|
# intervalCount (uint32_t), advanceY (uint8_t), ascender (int32_t), descender (int32_t), is2Bit (uint8_t), totalGlyphCount (uint32_t)
|
|
f.write(struct.pack("<IBiiBI", len(intervals), norm_ceil(face.size.height), norm_ceil(face.size.ascender), norm_floor(face.size.descender), 1 if is2Bit else 0, len(glyph_props)))
|
|
# Intervals
|
|
offset = 0
|
|
for i_start, i_end in intervals:
|
|
f.write(struct.pack("<III", i_start, i_end, offset))
|
|
offset += i_end - i_start + 1
|
|
# Glyphs
|
|
for g in glyph_props:
|
|
# dataOffset (uint32_t), dataLength (uint16_t), width (uint8_t), height (uint8_t), advanceX (uint8_t), left (int8_t), top (int8_t)
|
|
# wait, GlyphProps has width, height, advance_x, left, top, data_length, data_offset, code_point
|
|
# We need: dataOffset (4), dataLength (2), width (1), height (1), advanceX (1), left (1), top (1) = 11 bytes?
|
|
# Let's use 13 bytes as planned to be safer or just 11.
|
|
# Original EpdGlyph:
|
|
# uint32_t dataOffset;
|
|
# uint16_t dataLength;
|
|
# uint8_t width;
|
|
# uint8_t height;
|
|
# uint8_t advanceX;
|
|
# int8_t left;
|
|
# int8_t top;
|
|
# Total: 4+2+1+1+1+1+1 = 11 bytes.
|
|
# I will use 13 bytes to align better if needed, but 11 is fine.
|
|
# Let's use 13 bytes as per plan: 4+2+1+1+1+1+1 + 2 padding.
|
|
# CustomEpdFont.cpp expects:
|
|
# glyphBuf[0] = w
|
|
# glyphBuf[1] = h
|
|
# glyphBuf[2] = adv
|
|
# glyphBuf[3] = l (signed)
|
|
# glyphBuf[4] = unused
|
|
# glyphBuf[5] = t (signed)
|
|
# glyphBuf[6] = unused
|
|
# glyphBuf[7-8] = dLen
|
|
# glyphBuf[9-12] = dOffset
|
|
f.write(struct.pack("<BBB b B b B H I", g.width, g.height, g.advance_x, g.left, 0, g.top, 0, g.data_length, g.data_offset))
|
|
# Bitmaps
|
|
f.write(bytes(glyph_data))
|
|
print(f"Generated {font_name}.epdfont")
|
|
else:
|
|
print(f"/**\n * generated by fontconvert.py\n * name: {font_name}\n * size: {size}\n * mode: {'2-bit' if is2Bit else '1-bit'}\n */")
|
|
print("#pragma once")
|
|
print("#include \"EpdFontData.h\"\n")
|
|
print(f"static const uint8_t {font_name}Bitmaps[{len(glyph_data)}] = {{")
|
|
for c in chunks(glyph_data, 16):
|
|
print (" " + " ".join(f"0x{b:02X}," for b in c))
|
|
print ("};\n");
|
|
|
|
print(f"static const EpdGlyph {font_name}Glyphs[] = {{")
|
|
for i, g in enumerate(glyph_props):
|
|
print (" { " + ", ".join([f"{a}" for a in list(g[:-1])]),"},", f"// {chr(g.code_point) if g.code_point != 92 else '<backslash>'}")
|
|
print ("};\n");
|
|
|
|
print(f"static const EpdUnicodeInterval {font_name}Intervals[] = {{")
|
|
offset = 0
|
|
for i_start, i_end in intervals:
|
|
print (f" {{ 0x{i_start:X}, 0x{i_end:X}, 0x{offset:X} }},")
|
|
offset += i_end - i_start + 1
|
|
print ("};\n");
|
|
|
|
print(f"static const EpdFontData {font_name} = {{")
|
|
print(f" {font_name}Bitmaps,")
|
|
print(f" {font_name}Glyphs,")
|
|
print(f" {font_name}Intervals,")
|
|
print(f" {len(intervals)},")
|
|
print(f" {norm_ceil(face.size.height)},")
|
|
print(f" {norm_ceil(face.size.ascender)},")
|
|
print(f" {norm_floor(face.size.descender)},")
|
|
print(f" {'true' if is2Bit else 'false'},")
|
|
print("};")
|
|
|