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| #
| # The Python Imaging Library
| # $Id$
| #
| # base class for raster font file parsers
| #
| # history:
| # 1997-06-05 fl created
| # 1997-08-19 fl restrict image width
| #
| # Copyright (c) 1997-1998 by Secret Labs AB
| # Copyright (c) 1997-1998 by Fredrik Lundh
| #
| # See the README file for information on usage and redistribution.
| #
| from __future__ import annotations
|
| import os
| from typing import BinaryIO
|
| from . import Image, _binary
|
| WIDTH = 800
|
|
| def puti16(
| fp: BinaryIO, values: tuple[int, int, int, int, int, int, int, int, int, int]
| ) -> None:
| """Write network order (big-endian) 16-bit sequence"""
| for v in values:
| if v < 0:
| v += 65536
| fp.write(_binary.o16be(v))
|
|
| class FontFile:
| """Base class for raster font file handlers."""
|
| bitmap: Image.Image | None = None
|
| def __init__(self) -> None:
| self.info: dict[bytes, bytes | int] = {}
| self.glyph: list[
| tuple[
| tuple[int, int],
| tuple[int, int, int, int],
| tuple[int, int, int, int],
| Image.Image,
| ]
| | None
| ] = [None] * 256
|
| def __getitem__(self, ix: int) -> (
| tuple[
| tuple[int, int],
| tuple[int, int, int, int],
| tuple[int, int, int, int],
| Image.Image,
| ]
| | None
| ):
| return self.glyph[ix]
|
| def compile(self) -> None:
| """Create metrics and bitmap"""
|
| if self.bitmap:
| return
|
| # create bitmap large enough to hold all data
| h = w = maxwidth = 0
| lines = 1
| for glyph in self.glyph:
| if glyph:
| d, dst, src, im = glyph
| h = max(h, src[3] - src[1])
| w = w + (src[2] - src[0])
| if w > WIDTH:
| lines += 1
| w = src[2] - src[0]
| maxwidth = max(maxwidth, w)
|
| xsize = maxwidth
| ysize = lines * h
|
| if xsize == 0 and ysize == 0:
| return
|
| self.ysize = h
|
| # paste glyphs into bitmap
| self.bitmap = Image.new("1", (xsize, ysize))
| self.metrics: list[
| tuple[tuple[int, int], tuple[int, int, int, int], tuple[int, int, int, int]]
| | None
| ] = [None] * 256
| x = y = 0
| for i in range(256):
| glyph = self[i]
| if glyph:
| d, dst, src, im = glyph
| xx = src[2] - src[0]
| x0, y0 = x, y
| x = x + xx
| if x > WIDTH:
| x, y = 0, y + h
| x0, y0 = x, y
| x = xx
| s = src[0] + x0, src[1] + y0, src[2] + x0, src[3] + y0
| self.bitmap.paste(im.crop(src), s)
| self.metrics[i] = d, dst, s
|
| def save(self, filename: str) -> None:
| """Save font"""
|
| self.compile()
|
| # font data
| if not self.bitmap:
| msg = "No bitmap created"
| raise ValueError(msg)
| self.bitmap.save(os.path.splitext(filename)[0] + ".pbm", "PNG")
|
| # font metrics
| with open(os.path.splitext(filename)[0] + ".pil", "wb") as fp:
| fp.write(b"PILfont\n")
| fp.write(f";;;;;;{self.ysize};\n".encode("ascii")) # HACK!!!
| fp.write(b"DATA\n")
| for id in range(256):
| m = self.metrics[id]
| if not m:
| puti16(fp, (0,) * 10)
| else:
| puti16(fp, m[0] + m[1] + m[2])
|
|
