Aluode/PerceptionLabPortable

1#
2# The Python Imaging Library.
3# $Id$
4#
5# PCD file handling
6#
7# History:
8#       96-05-10 fl     Created
9#       96-05-27 fl     Added draft mode (128x192, 256x384)
10#
11# Copyright (c) Secret Labs AB 1997.
12# Copyright (c) Fredrik Lundh 1996.
13#
14# See the README file for information on usage and redistribution.
15#
16from __future__ import annotations
17
18from . import Image, ImageFile
19
20##
21# Image plugin for PhotoCD images.  This plugin only reads the 768x512
22# image from the file; higher resolutions are encoded in a proprietary
23# encoding.
24
25
26class PcdImageFile(ImageFile.ImageFile):
27    format = "PCD"
28    format_description = "Kodak PhotoCD"
29
30    def _open(self) -> None:
31        # rough
32        assert self.fp is not None
33
34        self.fp.seek(2048)
35        s = self.fp.read(1539)
36
37        if not s.startswith(b"PCD_"):
38            msg = "not a PCD file"
39            raise SyntaxError(msg)
40
41        orientation = s[1538] & 3
42        self.tile_post_rotate = None
43        if orientation == 1:
44            self.tile_post_rotate = 90
45        elif orientation == 3:
46            self.tile_post_rotate = 270
47
48        self._mode = "RGB"
49        self._size = (512, 768) if orientation in (1, 3) else (768, 512)
50        self.tile = [ImageFile._Tile("pcd", (0, 0, 768, 512), 96 * 2048)]
51
52    def load_prepare(self) -> None:
53        if self._im is None and self.tile_post_rotate:
54            self.im = Image.core.new(self.mode, (768, 512))
55        ImageFile.ImageFile.load_prepare(self)
56
57    def load_end(self) -> None:
58        if self.tile_post_rotate:
59            # Handle rotated PCDs
60            self.im = self.rotate(self.tile_post_rotate, expand=True).im
61
62
63#
64# registry
65
66Image.register_open(PcdImageFile.format, PcdImageFile)
67
68Image.register_extension(PcdImageFile.format, ".pcd")
69