mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-19 05:58:09 +00:00
c448a7bcfc
The new option allows generation of font glyph definition where both lowercase and uppercase letters are mapped to uppercase glyphs. [no changelog]
518 lines
17 KiB
Python
Executable File
518 lines
17 KiB
Python
Executable File
#!/usr/bin/env python3
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# script used to generate core/embed/lib/fonts/font_*_*.c
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from __future__ import annotations
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import unicodedata
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from dataclasses import dataclass
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from pathlib import Path
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from typing import TextIO
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import json
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import sys
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# pip install freetype-py
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import freetype
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from foreign_chars import all_languages
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def _normalize(s: str) -> str:
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return unicodedata.normalize("NFKC", s)
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HERE = Path(__file__).parent
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CORE_ROOT = HERE.parent.parent
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FONTS_DIR = HERE / "fonts"
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OUT_DIR = HERE / ".." / ".." / "embed" / "lib" / "fonts"
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C_FONTS_DEST = CORE_ROOT / "embed" / "lib" / "fonts"
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JSON_FONTS_DEST = CORE_ROOT / "translations" / "fonts"
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MIN_GLYPH = ord(" ")
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MAX_GLYPH = ord("~")
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WRITE_WIDTHS = False
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# characters for which bearingX is negative, but we choose to make it zero and modify
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# advance instead
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MODIFY_BEARING_X = [
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_normalize(c)
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for c in (
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"Ä",
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"À",
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"Â",
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"Æ",
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"Î",
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"Ï",
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"î",
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"ï",
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"ÿ",
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"Ý",
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"Ÿ",
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"Á",
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"ý",
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"A",
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"X",
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"Y",
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"j",
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"x",
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"y",
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"}",
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")",
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",",
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"/",
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"_",
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)
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]
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# metrics explanation: https://www.freetype.org/freetype2/docs/glyphs/metrics.png
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def process_bitmap_buffer(
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buf: list[int], bpp: int, width: int, height: int
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) -> list[int]:
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res = buf[:]
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if bpp == 1:
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for _ in range(8 - len(res) % 8):
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res.append(0)
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res = [
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(
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(a & 0x80)
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| ((b & 0x80) >> 1)
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| ((c & 0x80) >> 2)
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| ((d & 0x80) >> 3)
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| ((e & 0x80) >> 4)
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| ((f & 0x80) >> 5)
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| ((g & 0x80) >> 6)
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| ((h & 0x80) >> 7)
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)
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for a, b, c, d, e, f, g, h in [
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res[i : i + 8] for i in range(0, len(res), 8)
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]
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]
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elif bpp == 2:
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for _ in range(4 - len(res) % 4):
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res.append(0)
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res = [
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((a & 0xC0) | ((b & 0xC0) >> 2) | ((c & 0xC0) >> 4) | ((d & 0xC0) >> 6))
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for a, b, c, d in [res[i : i + 4] for i in range(0, len(res), 4)]
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]
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elif bpp == 4:
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res: list[int] = []
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for y in range(0, height):
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row = buf[y * width : (y + 1) * width]
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for a, b in zip(row[::2], row[1::2]):
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res.append(((b & 0xF0) | (a >> 4)))
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if width & 1 != 0:
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res.append(row[-1] >> 4)
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elif bpp == 8:
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pass
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else:
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raise ValueError
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return res
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def drop_left_columns(buf: list[int], width: int, drop: int) -> list[int]:
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res: list[int] = []
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for i in range(len(buf)):
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if i % width >= drop:
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res.append(buf[i])
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return res
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@dataclass
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class Glyph:
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char: str
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width: int
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rows: int
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advance: int
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bearingX: int
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bearingY: int
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buf: list[int]
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num_grays: int
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inverse_colors: bool = False
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@classmethod
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def from_face(
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cls, face: freetype.Face, c: str, shaveX: int, inverse_colors: bool = False
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) -> Glyph:
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assert len(c) == 1
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bitmap = face.glyph.bitmap
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metrics = face.glyph.metrics
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assert metrics.width // 64 == bitmap.width
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assert metrics.height // 64 == bitmap.rows
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assert metrics.width % 64 == 0
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assert metrics.height % 64 == 0
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assert metrics.horiAdvance % 64 == 0
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assert metrics.horiBearingX % 64 == 0
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assert metrics.horiBearingY % 64 == 0
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assert bitmap.width == bitmap.pitch
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assert len(bitmap.buffer) == bitmap.pitch * bitmap.rows
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width = bitmap.width
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rows = bitmap.rows
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advance = metrics.horiAdvance // 64
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bearingX = metrics.horiBearingX // 64
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remove_left = shaveX
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# discard space on the left side
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if shaveX > 0:
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diff = min(advance, bearingX, shaveX)
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advance -= diff
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bearingX -= diff
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remove_left -= diff
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# the following code is here just for some letters (listed at start)
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# not using negative bearingX makes life so much easier; add it to advance instead
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if bearingX < 0:
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if c in MODIFY_BEARING_X:
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advance += -bearingX
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bearingX = 0
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else:
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raise ValueError(f"Negative bearingX for character '{c}'")
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bearingY = metrics.horiBearingY // 64
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assert advance >= 0 and advance <= 255
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assert bearingX >= 0 and bearingX <= 255
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if bearingY < 0: # HACK
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print(f"normalizing bearingY {bearingY} for '{c}'")
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bearingY = 0
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assert bearingY >= 0 and bearingY <= 255
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buf = list(bitmap.buffer)
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# discard non-space pixels on the left side
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if remove_left > 0 and width > 0:
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assert bearingX == 0
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buf = drop_left_columns(buf, width, remove_left)
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assert width > remove_left
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width -= remove_left
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assert advance > remove_left
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advance -= remove_left
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print(f'Glyph "{c}": removed {remove_left} pixel columns from the left')
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return Glyph(
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char=c,
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width=width,
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rows=rows,
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advance=advance,
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bearingX=bearingX,
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bearingY=bearingY,
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buf=buf,
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num_grays=bitmap.num_grays,
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inverse_colors=inverse_colors,
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)
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def print_metrics(self) -> None:
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print(
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f'Loaded glyph "{self.char}" ... {self.width} x {self.rows} @ {self.num_grays} grays ({len(self.buf)} bytes, metrics: {self.advance}, {self.bearingX}, {self.bearingY})'
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)
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def process_byte(self, b: int) -> int:
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if self.inverse_colors:
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return b ^ 0xFF
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else:
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return b
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def get_definition_line(
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self,
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name_style_size: str,
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bpp: int,
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i: int | str,
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static: bool = True,
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) -> str:
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numbers = ", ".join(str(n) for n in self.to_bytes(bpp))
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comment = f"/* {self.char} */"
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const_name = f"Font_{name_style_size}_glyph_{i}"
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if static:
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modifier = "static const"
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else:
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modifier = "const"
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return f"{comment} {modifier} uint8_t {const_name}[] = {{ {numbers} }};\n"
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def to_bytes(self, bpp: int) -> bytes:
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infos = [
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self.width,
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self.rows,
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self.advance,
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self.bearingX,
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self.bearingY,
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]
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if self.buf:
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data = [
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self.process_byte(x)
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for x in process_bitmap_buffer(self.buf, bpp, self.width, self.rows)
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]
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return bytes(infos + data)
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else:
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return bytes(infos)
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class FaceProcessor:
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def __init__(
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self,
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name: str,
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style: str,
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size: int,
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bpp: int = 4,
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shaveX: int = 0,
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ext: str = "ttf",
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gen_normal: bool = True, # generate font with all the letters
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gen_upper: bool = False, # generate font with only upper-cased letters
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):
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if gen_normal is False and gen_upper is False:
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raise ValueError(
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"At least one must be selected from normal glyphs or only uppercased glyphs."
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)
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print(f"Processing ... {name} {style} {size}")
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self.name = name
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self.style = style
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self.size = size
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self.bpp = bpp
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self.shaveX = shaveX
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self.ext = ext
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self.gen_normal = gen_normal
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self.gen_upper = gen_upper
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self.face = freetype.Face(str(FONTS_DIR / f"{name}-{style}.{ext}"))
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self.face.set_pixel_sizes(0, size) # type: ignore
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self.fontname = f"{name.lower()}_{style.lower()}_{size}"
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self.font_ymin = 0
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self.font_ymax = 0
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@property
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def _name_style_size(self) -> str:
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return f"{self.name}_{self.style}_{self.size}"
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@property
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def _c_file_name(self) -> Path:
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return C_FONTS_DEST / f"font_{self.fontname}.c"
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@property
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def _h_file_name(self) -> Path:
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return C_FONTS_DEST / f"font_{self.fontname}.h"
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def write_files(self) -> None:
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self.write_c_files()
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if self.gen_normal:
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self.write_foreign_json(upper_cased=False)
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if self.gen_upper:
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self.write_foreign_json(upper_cased=True)
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if WRITE_WIDTHS:
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self.write_char_widths_files()
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def write_c_files(self) -> None:
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self._write_c_file()
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self._write_h_file()
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def write_foreign_json(self, upper_cased=False) -> None:
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for lang, language_chars in all_languages.items():
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fontdata = {}
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for item in language_chars:
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c = _normalize(item)
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map_from = c
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if c.islower() and upper_cased and c != "ß":
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# FIXME not sure how to properly handle the german "ß"
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c = c.upper()
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assert len(c) == 1
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assert len(map_from) == 1
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self._load_char(c)
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glyph = Glyph.from_face(self.face, c, self.shaveX)
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glyph.print_metrics()
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fontdata[map_from] = glyph.to_bytes(self.bpp).hex()
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file = (
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JSON_FONTS_DEST
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/ f"font_{self.fontname}{'_upper' if upper_cased else ''}_{lang}.json"
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)
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json_content = json.dumps(fontdata, indent=2, ensure_ascii=False)
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file.write_text(json_content + "\n")
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def write_char_widths_files(self) -> None:
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chars: set[str] = set()
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widths: dict[str, int] = {}
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# "normal" ASCII characters
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for i in range(MIN_GLYPH, MAX_GLYPH + 1):
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c = chr(i)
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if c.islower() and not self.gen_normal:
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c = c.upper()
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chars.add(c)
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# foreign language data
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for _lang, lang_chars in all_languages.items():
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for c in lang_chars:
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chars.add(c)
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for c in sorted(chars):
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self._load_char(c)
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glyph = Glyph.from_face(self.face, c, self.shaveX)
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widths[c] = glyph.advance
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filename = f"font_widths_{self.fontname}.json"
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with open(filename, "w", encoding="utf-8") as f:
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json_content = json.dumps(widths, indent=2, ensure_ascii=False)
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f.write(json_content + "\n")
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def _write_c_file(self) -> None:
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with open(OUT_DIR / self._c_file_name, "wt") as f:
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self._write_c_file_header(f)
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self._write_c_file_content(f)
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def _write_c_file_content(self, f: TextIO) -> None:
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# Write "normal" ASCII characters
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for i in range(MIN_GLYPH, MAX_GLYPH + 1):
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if chr(i).islower() and not self.gen_normal:
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continue
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self._write_char_definition(f, chr(i), i)
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# Write nonprintable glyph
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if self.gen_normal:
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f.write("\n")
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nonprintable = self._get_nonprintable_definition_line()
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f.write(nonprintable)
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if self.gen_upper:
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f.write("\n")
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nonprintable = self._get_nonprintable_definition_line(upper=True)
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f.write(nonprintable)
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# Write array of all glyphs
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if self.gen_normal:
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f.write("\n")
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f.write(
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f"const uint8_t * const Font_{self._name_style_size}[{MAX_GLYPH} + 1 - {MIN_GLYPH}] = {{\n"
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)
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for i in range(MIN_GLYPH, MAX_GLYPH + 1):
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f.write(f" Font_{self._name_style_size}_glyph_{i},\n")
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f.write("};\n")
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# Write array of all glyphs for _upper version
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if self.gen_upper:
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f.write("\n")
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f.write(
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f"const uint8_t * const Font_{self._name_style_size}_upper[{MAX_GLYPH} + 1 - {MIN_GLYPH}] = {{\n"
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)
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for i in range(MIN_GLYPH, MAX_GLYPH + 1):
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comment = ""
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if chr(i).islower():
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c_from = chr(i)
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c_to = c_from.upper()
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i = ord(c_to)
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comment = f" // {c_from} -> {c_to}"
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f.write(f" Font_{self._name_style_size}_glyph_{i},{comment}\n")
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f.write("};\n")
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def _write_char_definition(self, f: TextIO, c: str, i: int) -> None:
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self._load_char(c)
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glyph = Glyph.from_face(self.face, c, self.shaveX)
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glyph.print_metrics()
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definition_line = glyph.get_definition_line(self._name_style_size, self.bpp, i)
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f.write(definition_line)
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# Update mix/max metrics
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yMin = glyph.bearingY - glyph.rows
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yMax = yMin + glyph.rows
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self.font_ymin = min(self.font_ymin, yMin)
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self.font_ymax = max(self.font_ymax, yMax)
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def _write_c_file_header(self, f: TextIO) -> None:
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f.write("// This file is generated by core/tools/codegen/gen_font.py\n\n")
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f.write("#include <stdint.h>\n\n")
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f.write("// clang-format off\n\n")
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f.write("// - the first two bytes are width and height of the glyph\n")
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f.write(
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"// - the third, fourth and fifth bytes are advance, bearingX and bearingY of the horizontal metrics of the glyph\n"
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)
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f.write(f"// - the rest is packed {self.bpp}-bit glyph data\n\n")
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def _get_nonprintable_definition_line(self, upper: bool = False) -> str:
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c = "?"
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self._load_char(c)
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glyph = Glyph.from_face(self.face, c, self.shaveX, inverse_colors=True)
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if upper:
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return glyph.get_definition_line(
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f"{self._name_style_size}_upper", self.bpp, "nonprintable", static=False
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)
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else:
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return glyph.get_definition_line(
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self._name_style_size, self.bpp, "nonprintable", static=False
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)
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def _load_char(self, c: str) -> None:
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self.face.load_char(c, freetype.FT_LOAD_RENDER | freetype.FT_LOAD_TARGET_NORMAL) # type: ignore
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def _write_h_file(self) -> None:
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with open(OUT_DIR / self._h_file_name, "wt") as f:
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f.write("// This file is generated by core/tools/codegen/gen_font.py\n\n")
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f.write("#include <stdint.h>\n\n")
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f.write(f"#if TREZOR_FONT_BPP != {self.bpp}\n")
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f.write(f"#error Wrong TREZOR_FONT_BPP (expected {self.bpp})\n")
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f.write("#endif\n")
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if self.gen_normal:
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f.write(f"#define Font_{self._name_style_size}_HEIGHT {self.size}\n")
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f.write(
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f"#define Font_{self._name_style_size}_MAX_HEIGHT {self.font_ymax - self.font_ymin}\n"
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)
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f.write(
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f"#define Font_{self._name_style_size}_BASELINE {-self.font_ymin}\n"
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)
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f.write(
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f"extern const uint8_t* const Font_{self._name_style_size}[{MAX_GLYPH} + 1 - {MIN_GLYPH}];\n"
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)
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f.write(
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f"extern const uint8_t Font_{self._name_style_size}_glyph_nonprintable[];\n"
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)
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if self.gen_upper:
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f.write(
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f"#define Font_{self._name_style_size}_upper_HEIGHT {self.size}\n"
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)
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f.write(
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f"#define Font_{self._name_style_size}_upper_MAX_HEIGHT {self.font_ymax - self.font_ymin}\n"
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)
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f.write(
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f"#define Font_{self._name_style_size}_upper_BASELINE {-self.font_ymin}\n"
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)
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f.write(
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f"extern const uint8_t* const Font_{self._name_style_size}_upper[{MAX_GLYPH} + 1 - {MIN_GLYPH}];\n"
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)
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f.write(
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f"extern const uint8_t Font_{self._name_style_size}_upper_glyph_nonprintable[];\n"
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)
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if __name__ == "__main__":
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if len(sys.argv) > 1 and "width" in sys.argv[1]:
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WRITE_WIDTHS = True # type: ignore
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FaceProcessor("Roboto", "Regular", 20).write_files()
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FaceProcessor("Roboto", "Bold", 20).write_files()
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FaceProcessor("TTHoves", "Regular", 21, ext="otf").write_files()
|
|
FaceProcessor("TTHoves", "DemiBold", 21, ext="otf").write_files()
|
|
FaceProcessor(
|
|
"TTHoves", "Bold", 17, ext="otf", gen_normal=False, gen_upper=True
|
|
).write_files()
|
|
FaceProcessor("RobotoMono", "Medium", 20).write_files()
|
|
|
|
FaceProcessor(
|
|
"PixelOperator",
|
|
"Regular",
|
|
8,
|
|
bpp=1,
|
|
shaveX=1,
|
|
gen_normal=True,
|
|
gen_upper=True,
|
|
).write_files()
|
|
FaceProcessor(
|
|
"PixelOperator",
|
|
"Bold",
|
|
8,
|
|
bpp=1,
|
|
shaveX=1,
|
|
gen_normal=True,
|
|
gen_upper=True,
|
|
).write_files()
|
|
FaceProcessor("PixelOperatorMono", "Regular", 8, bpp=1, shaveX=1).write_files()
|
|
|
|
# For model R
|
|
FaceProcessor("Unifont", "Regular", 16, bpp=1, shaveX=1, ext="otf").write_files()
|
|
# NOTE: Unifont Bold does not seem to have czech characters
|
|
FaceProcessor("Unifont", "Bold", 16, bpp=1, shaveX=1, ext="otf").write_files()
|
|
|
|
FaceProcessor("TTSatoshi", "DemiBold", 42, ext="otf").write_files()
|
|
FaceProcessor("TTSatoshi", "DemiBold", 21, ext="otf").write_files()
|
|
FaceProcessor("TTSatoshi", "DemiBold", 18, ext="otf").write_files()
|
|
FaceProcessor("RobotoMono", "Medium", 21).write_files()
|