104 lines
2.7 KiB
Python
104 lines
2.7 KiB
Python
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#
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# The Python Imaging Library.
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# $Id$
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#
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# Windows Cursor support for PIL
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#
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# notes:
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# uses BmpImagePlugin.py to read the bitmap data.
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#
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# history:
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# 96-05-27 fl Created
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#
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# Copyright (c) Secret Labs AB 1997.
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# Copyright (c) Fredrik Lundh 1996.
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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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from . import BmpImagePlugin, Image, ImageOps
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from ._binary import i16le as i16
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from ._binary import i32le as i32
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#
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# --------------------------------------------------------------------
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def _accept(prefix: bytes) -> bool:
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return prefix.startswith(b"\0\0\2\0")
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##
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# Image plugin for Windows Cursor files.
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class CurImageFile(BmpImagePlugin.BmpImageFile):
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format = "CUR"
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format_description = "Windows Cursor"
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def _open(self) -> None:
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assert self.fp is not None
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offset = self.fp.tell()
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# check magic
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s = self.fp.read(6)
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if not _accept(s):
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msg = "not a CUR file"
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raise SyntaxError(msg)
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# pick the largest cursor in the file
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m = b""
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for i in range(i16(s, 4)):
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s = self.fp.read(16)
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if not m:
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m = s
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elif s[0] > m[0] and s[1] > m[1]:
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m = s
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if not m:
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msg = "No cursors were found"
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raise TypeError(msg)
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# load as bitmap
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self._bitmap(i32(m, 12) + offset)
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self._masked = self.mode in ("1", "L")
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if self._masked:
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self._rawmode = self.mode
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self._mode = "LA"
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# patch up the bitmap height
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self._size = self.width, self.height // 2
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if not self._masked:
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self.tile = [self.tile[0]._replace(extents=(0, 0) + self.size)]
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def load_prepare(self) -> None:
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if self._masked:
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self._mode = self._rawmode
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self._size = self.width, self.height * 2
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super().load_prepare()
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def load_end(self) -> None:
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if not self._masked:
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return
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self._mode = "LA"
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new_height = self.height // 2
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and_mask = self.im.crop((0, 0, self.width, new_height))
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xor_mask = self.im.crop((0, new_height, self.width, self.height))
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self._size = self.width, new_height
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self._im = Image.core.fill(self.mode, self.size)
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self._im.paste(
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xor_mask.convert(self.mode),
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(0, 0) + self.size,
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ImageOps.invert(Image.Image()._new(and_mask)).im,
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)
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#
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# --------------------------------------------------------------------
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Image.register_open(CurImageFile.format, CurImageFile, _accept)
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Image.register_extension(CurImageFile.format, ".cur")
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