codekingpro/portable-devtools

1#
2# The Python Imaging Library.
3# $Id$
4#
5# Windows Cursor support for PIL
6#
7# notes:
8#       uses BmpImagePlugin.py to read the bitmap data.
9#
10# history:
11#       96-05-27 fl     Created
12#
13# Copyright (c) Secret Labs AB 1997.
14# Copyright (c) Fredrik Lundh 1996.
15#
16# See the README file for information on usage and redistribution.
17#
18from __future__ import annotations
19
20from . import BmpImagePlugin, Image
21from ._binary import i16le as i16
22from ._binary import i32le as i32
23
24#
25# --------------------------------------------------------------------
26
27
28def _accept(prefix: bytes) -> bool:
29    return prefix.startswith(b"\0\0\2\0")
30
31
32##
33# Image plugin for Windows Cursor files.
34
35
36class CurImageFile(BmpImagePlugin.BmpImageFile):
37    format = "CUR"
38    format_description = "Windows Cursor"
39
40    def _open(self) -> None:
41        assert self.fp is not None
42        offset = self.fp.tell()
43
44        # check magic
45        s = self.fp.read(6)
46        if not _accept(s):
47            msg = "not a CUR file"
48            raise SyntaxError(msg)
49
50        # pick the largest cursor in the file
51        m = b""
52        for i in range(i16(s, 4)):
53            s = self.fp.read(16)
54            if not m:
55                m = s
56            elif s[0] > m[0] and s[1] > m[1]:
57                m = s
58        if not m:
59            msg = "No cursors were found"
60            raise TypeError(msg)
61
62        # load as bitmap
63        self._bitmap(i32(m, 12) + offset)
64
65        # patch up the bitmap height
66        self._size = self.size[0], self.size[1] // 2
67        self.tile = [self.tile[0]._replace(extents=(0, 0) + self.size)]
68
69
70#
71# --------------------------------------------------------------------
72
73Image.register_open(CurImageFile.format, CurImageFile, _accept)
74
75Image.register_extension(CurImageFile.format, ".cur")
76