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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]) | |