Aluode/PerceptionLabPortable
0
1#
2# The Python Imaging Library
3# $Id$
4#
5# Adobe PSD 2.5/3.0 file handling
6#
7# History:
8# 1995-09-01 fl Created
9# 1997-01-03 fl Read most PSD images
10# 1997-01-18 fl Fixed P and CMYK support
11# 2001-10-21 fl Added seek/tell support (for layers)
12#
13# Copyright (c) 1997-2001 by Secret Labs AB.
14# Copyright (c) 1995-2001 by Fredrik Lundh
15#
16# See the README file for information on usage and redistribution.
17#
18from __future__ import annotations
19
20import io
21from functools import cached_property
22from typing import IO
23
24from . import Image, ImageFile, ImagePalette
25from ._binary import i8
26from ._binary import i16be as i16
27from ._binary import i32be as i32
28from ._binary import si16be as si16
29from ._binary import si32be as si32
30from ._util import DeferredError
31
32MODES = {
33 # (photoshop mode, bits) -> (pil mode, required channels)
34 (0, 1): ("1", 1),
35 (0, 8): ("L", 1),
36 (1, 8): ("L", 1),
37 (2, 8): ("P", 1),
38 (3, 8): ("RGB", 3),
39 (4, 8): ("CMYK", 4),
40 (7, 8): ("L", 1), # FIXME: multilayer
41 (8, 8): ("L", 1), # duotone
42 (9, 8): ("LAB", 3),
43}
44
45
46# --------------------------------------------------------------------.
47# read PSD images
48
49
50def _accept(prefix: bytes) -> bool:
51 return prefix.startswith(b"8BPS")
52
53
54##
55# Image plugin for Photoshop images.
56
57
58class PsdImageFile(ImageFile.ImageFile):
59 format = "PSD"
60 format_description = "Adobe Photoshop"
61 _close_exclusive_fp_after_loading = False
62
63 def _open(self) -> None:
64 assert self.fp is not None
65 read = self.fp.read
66
67 #
68 # header
69
70 s = read(26)
71 if not _accept(s) or i16(s, 4) != 1:
72 msg = "not a PSD file"
73 raise SyntaxError(msg)
74
75 psd_bits = i16(s, 22)
76 psd_channels = i16(s, 12)
77 psd_mode = i16(s, 24)
78
79 mode, channels = MODES[(psd_mode, psd_bits)]
80
81 if channels > psd_channels:
82 msg = "not enough channels"
83 raise OSError(msg)
84 if mode == "RGB" and psd_channels == 4:
85 mode = "RGBA"
86 channels = 4
87
88 self._mode = mode
89 self._size = i32(s, 18), i32(s, 14)
90
91 #
92 # color mode data
93
94 size = i32(read(4))
95 if size:
96 data = read(size)
97 if mode == "P" and size == 768:
98 self.palette = ImagePalette.raw("RGB;L", data)
99
100 #
101 # image resources
102
103 self.resources = []
104
105 size = i32(read(4))
106 if size:
107 # load resources
108 end = self.fp.tell() + size
109 while self.fp.tell() < end:
110 read(4) # signature
111 id = i16(read(2))
112 name = read(i8(read(1)))
113 if not (len(name) & 1):
114 read(1) # padding
115 data = read(i32(read(4)))
116 if len(data) & 1:
117 read(1) # padding
118 self.resources.append((id, name, data))
119 if id == 1039: # ICC profile
120 self.info["icc_profile"] = data
121
122 #
123 # layer and mask information
124
125 self._layers_position = None
126
127 size = i32(read(4))
128 if size:
129 end = self.fp.tell() + size
130 size = i32(read(4))
131 if size:
132 self._layers_position = self.fp.tell()
133 self._layers_size = size
134 self.fp.seek(end)
135 self._n_frames: int | None = None
136
137 #
138 # image descriptor
139
140 self.tile = _maketile(self.fp, mode, (0, 0) + self.size, channels)
141
142 # keep the file open
143 self._fp = self.fp
144 self.frame = 1
145 self._min_frame = 1
146
147 @cached_property
148 def layers(
149 self,
150 ) -> list[tuple[str, str, tuple[int, int, int, int], list[ImageFile._Tile]]]:
151 layers = []
152 if self._layers_position is not None:
153 if isinstance(self._fp, DeferredError):
154 raise self._fp.ex
155 self._fp.seek(self._layers_position)
156 _layer_data = io.BytesIO(ImageFile._safe_read(self._fp, self._layers_size))
157 layers = _layerinfo(_layer_data, self._layers_size)
158 self._n_frames = len(layers)
159 return layers
160
161 @property
162 def n_frames(self) -> int:
163 if self._n_frames is None:
164 self._n_frames = len(self.layers)
165 return self._n_frames
166
167 @property
168 def is_animated(self) -> bool:
169 return len(self.layers) > 1
170
171 def seek(self, layer: int) -> None:
172 if not self._seek_check(layer):
173 return
174 if isinstance(self._fp, DeferredError):
175 raise self._fp.ex
176
177 # seek to given layer (1..max)
178 _, mode, _, tile = self.layers[layer - 1]
179 self._mode = mode
180 self.tile = tile
181 self.frame = layer
182 self.fp = self._fp
183
184 def tell(self) -> int:
185 # return layer number (0=image, 1..max=layers)
186 return self.frame
187
188
189def _layerinfo(
190 fp: IO[bytes], ct_bytes: int
191) -> list[tuple[str, str, tuple[int, int, int, int], list[ImageFile._Tile]]]:
192 # read layerinfo block
193 layers = []
194
195 def read(size: int) -> bytes:
196 return ImageFile._safe_read(fp, size)
197
198 ct = si16(read(2))
199
200 # sanity check
201 if ct_bytes < (abs(ct) * 20):
202 msg = "Layer block too short for number of layers requested"
203 raise SyntaxError(msg)
204
205 for _ in range(abs(ct)):
206 # bounding box
207 y0 = si32(read(4))
208 x0 = si32(read(4))
209 y1 = si32(read(4))
210 x1 = si32(read(4))
211
212 # image info
213 bands = []
214 ct_types = i16(read(2))
215 if ct_types > 4:
216 fp.seek(ct_types * 6 + 12, io.SEEK_CUR)
217 size = i32(read(4))
218 fp.seek(size, io.SEEK_CUR)
219 continue
220
221 for _ in range(ct_types):
222 type = i16(read(2))
223
224 if type == 65535:
225 b = "A"
226 else:
227 b = "RGBA"[type]
228
229 bands.append(b)
230 read(4) # size
231
232 # figure out the image mode
233 bands.sort()
234 if bands == ["R"]:
235 mode = "L"
236 elif bands == ["B", "G", "R"]:
237 mode = "RGB"
238 elif bands == ["A", "B", "G", "R"]:
239 mode = "RGBA"
240 else:
241 mode = "" # unknown
242
243 # skip over blend flags and extra information
244 read(12) # filler
245 name = ""
246 size = i32(read(4)) # length of the extra data field
247 if size:
248 data_end = fp.tell() + size
249
250 length = i32(read(4))
251 if length:
252 fp.seek(length - 16, io.SEEK_CUR)
253
254 length = i32(read(4))
255 if length:
256 fp.seek(length, io.SEEK_CUR)
257
258 length = i8(read(1))
259 if length:
260 # Don't know the proper encoding,
261 # Latin-1 should be a good guess
262 name = read(length).decode("latin-1", "replace")
263
264 fp.seek(data_end)
265 layers.append((name, mode, (x0, y0, x1, y1)))
266
267 # get tiles
268 layerinfo = []
269 for i, (name, mode, bbox) in enumerate(layers):
270 tile = []
271 for m in mode:
272 t = _maketile(fp, m, bbox, 1)
273 if t:
274 tile.extend(t)
275 layerinfo.append((name, mode, bbox, tile))
276
277 return layerinfo
278
279
280def _maketile(
281 file: IO[bytes], mode: str, bbox: tuple[int, int, int, int], channels: int
282) -> list[ImageFile._Tile]:
283 tiles = []
284 read = file.read
285
286 compression = i16(read(2))
287
288 xsize = bbox[2] - bbox[0]
289 ysize = bbox[3] - bbox[1]
290
291 offset = file.tell()
292
293 if compression == 0:
294 #
295 # raw compression
296 for channel in range(channels):
297 layer = mode[channel]
298 if mode == "CMYK":
299 layer += ";I"
300 tiles.append(ImageFile._Tile("raw", bbox, offset, layer))
301 offset = offset + xsize * ysize
302
303 elif compression == 1:
304 #
305 # packbits compression
306 i = 0
307 bytecount = read(channels * ysize * 2)
308 offset = file.tell()
309 for channel in range(channels):
310 layer = mode[channel]
311 if mode == "CMYK":
312 layer += ";I"
313 tiles.append(ImageFile._Tile("packbits", bbox, offset, layer))
314 for y in range(ysize):
315 offset = offset + i16(bytecount, i)
316 i += 2
317
318 file.seek(offset)
319
320 if offset & 1:
321 read(1) # padding
322
323 return tiles
324
325
326# --------------------------------------------------------------------
327# registry
328
329
330Image.register_open(PsdImageFile.format, PsdImageFile, _accept)
331
332Image.register_extension(PsdImageFile.format, ".psd")
333
334Image.register_mime(PsdImageFile.format, "image/vnd.adobe.photoshop")
335