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