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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])