Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/PIL/PsdImagePlugin.py: 56%

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 read = self.fp.read 

65 

66 # 

67 # header 

68 

69 s = read(26) 

70 if not _accept(s) or i16(s, 4) != 1: 

71 msg = "not a PSD file" 

72 raise SyntaxError(msg) 

73 

74 psd_bits = i16(s, 22) 

75 psd_channels = i16(s, 12) 

76 psd_mode = i16(s, 24) 

77 

78 mode, channels = MODES[(psd_mode, psd_bits)] 

79 

80 if channels > psd_channels: 

81 msg = "not enough channels" 

82 raise OSError(msg) 

83 if mode == "RGB" and psd_channels == 4: 

84 mode = "RGBA" 

85 channels = 4 

86 

87 self._mode = mode 

88 self._size = i32(s, 18), i32(s, 14) 

89 

90 # 

91 # color mode data 

92 

93 size = i32(read(4)) 

94 if size: 

95 data = read(size) 

96 if mode == "P" and size == 768: 

97 self.palette = ImagePalette.raw("RGB;L", data) 

98 

99 # 

100 # image resources 

101 

102 self.resources = [] 

103 

104 size = i32(read(4)) 

105 if size: 

106 # load resources 

107 end = self.fp.tell() + size 

108 while self.fp.tell() < end: 

109 read(4) # signature 

110 id = i16(read(2)) 

111 name = read(i8(read(1))) 

112 if not (len(name) & 1): 

113 read(1) # padding 

114 data = read(i32(read(4))) 

115 if len(data) & 1: 

116 read(1) # padding 

117 self.resources.append((id, name, data)) 

118 if id == 1039: # ICC profile 

119 self.info["icc_profile"] = data 

120 

121 # 

122 # layer and mask information 

123 

124 self._layers_position = None 

125 

126 size = i32(read(4)) 

127 if size: 

128 end = self.fp.tell() + size 

129 size = i32(read(4)) 

130 if size: 

131 self._layers_position = self.fp.tell() 

132 self._layers_size = size 

133 self.fp.seek(end) 

134 self._n_frames: int | None = None 

135 

136 # 

137 # image descriptor 

138 

139 self.tile = _maketile(self.fp, mode, (0, 0) + self.size, channels) 

140 

141 # keep the file open 

142 self._fp = self.fp 

143 self.frame = 1 

144 self._min_frame = 1 

145 

146 @cached_property 

147 def layers( 

148 self, 

149 ) -> list[tuple[str, str, tuple[int, int, int, int], list[ImageFile._Tile]]]: 

150 layers = [] 

151 if self._layers_position is not None: 

152 if isinstance(self._fp, DeferredError): 

153 raise self._fp.ex 

154 self._fp.seek(self._layers_position) 

155 _layer_data = io.BytesIO(ImageFile._safe_read(self._fp, self._layers_size)) 

156 layers = _layerinfo(_layer_data, self._layers_size) 

157 self._n_frames = len(layers) 

158 return layers 

159 

160 @property 

161 def n_frames(self) -> int: 

162 if self._n_frames is None: 

163 self._n_frames = len(self.layers) 

164 return self._n_frames 

165 

166 @property 

167 def is_animated(self) -> bool: 

168 return len(self.layers) > 1 

169 

170 def seek(self, layer: int) -> None: 

171 if not self._seek_check(layer): 

172 return 

173 if isinstance(self._fp, DeferredError): 

174 raise self._fp.ex 

175 

176 # seek to given layer (1..max) 

177 _, mode, _, tile = self.layers[layer - 1] 

178 self._mode = mode 

179 self.tile = tile 

180 self.frame = layer 

181 self.fp = self._fp 

182 

183 def tell(self) -> int: 

184 # return layer number (0=image, 1..max=layers) 

185 return self.frame 

186 

187 

188def _layerinfo( 

189 fp: IO[bytes], ct_bytes: int 

190) -> list[tuple[str, str, tuple[int, int, int, int], list[ImageFile._Tile]]]: 

191 # read layerinfo block 

192 layers = [] 

193 

194 def read(size: int) -> bytes: 

195 return ImageFile._safe_read(fp, size) 

196 

197 ct = si16(read(2)) 

198 

199 # sanity check 

200 if ct_bytes < (abs(ct) * 20): 

201 msg = "Layer block too short for number of layers requested" 

202 raise SyntaxError(msg) 

203 

204 for _ in range(abs(ct)): 

205 # bounding box 

206 y0 = si32(read(4)) 

207 x0 = si32(read(4)) 

208 y1 = si32(read(4)) 

209 x1 = si32(read(4)) 

210 

211 # image info 

212 bands = [] 

213 ct_types = i16(read(2)) 

214 if ct_types > 4: 

215 fp.seek(ct_types * 6 + 12, io.SEEK_CUR) 

216 size = i32(read(4)) 

217 fp.seek(size, io.SEEK_CUR) 

218 continue 

219 

220 for _ in range(ct_types): 

221 type = i16(read(2)) 

222 

223 if type == 65535: 

224 b = "A" 

225 else: 

226 b = "RGBA"[type] 

227 

228 bands.append(b) 

229 read(4) # size 

230 

231 # figure out the image mode 

232 bands.sort() 

233 if bands == ["R"]: 

234 mode = "L" 

235 elif bands == ["B", "G", "R"]: 

236 mode = "RGB" 

237 elif bands == ["A", "B", "G", "R"]: 

238 mode = "RGBA" 

239 else: 

240 mode = "" # unknown 

241 

242 # skip over blend flags and extra information 

243 read(12) # filler 

244 name = "" 

245 size = i32(read(4)) # length of the extra data field 

246 if size: 

247 data_end = fp.tell() + size 

248 

249 length = i32(read(4)) 

250 if length: 

251 fp.seek(length - 16, io.SEEK_CUR) 

252 

253 length = i32(read(4)) 

254 if length: 

255 fp.seek(length, io.SEEK_CUR) 

256 

257 length = i8(read(1)) 

258 if length: 

259 # Don't know the proper encoding, 

260 # Latin-1 should be a good guess 

261 name = read(length).decode("latin-1", "replace") 

262 

263 fp.seek(data_end) 

264 layers.append((name, mode, (x0, y0, x1, y1))) 

265 

266 # get tiles 

267 layerinfo = [] 

268 for i, (name, mode, bbox) in enumerate(layers): 

269 tile = [] 

270 for m in mode: 

271 t = _maketile(fp, m, bbox, 1) 

272 if t: 

273 tile.extend(t) 

274 layerinfo.append((name, mode, bbox, tile)) 

275 

276 return layerinfo 

277 

278 

279def _maketile( 

280 file: IO[bytes], mode: str, bbox: tuple[int, int, int, int], channels: int 

281) -> list[ImageFile._Tile]: 

282 tiles = [] 

283 read = file.read 

284 

285 compression = i16(read(2)) 

286 

287 xsize = bbox[2] - bbox[0] 

288 ysize = bbox[3] - bbox[1] 

289 

290 offset = file.tell() 

291 

292 if compression == 0: 

293 # 

294 # raw compression 

295 for channel in range(channels): 

296 layer = mode[channel] 

297 if mode == "CMYK": 

298 layer += ";I" 

299 tiles.append(ImageFile._Tile("raw", bbox, offset, layer)) 

300 offset = offset + xsize * ysize 

301 

302 elif compression == 1: 

303 # 

304 # packbits compression 

305 i = 0 

306 bytecount = read(channels * ysize * 2) 

307 offset = file.tell() 

308 for channel in range(channels): 

309 layer = mode[channel] 

310 if mode == "CMYK": 

311 layer += ";I" 

312 tiles.append(ImageFile._Tile("packbits", bbox, offset, layer)) 

313 for y in range(ysize): 

314 offset = offset + i16(bytecount, i) 

315 i += 2 

316 

317 file.seek(offset) 

318 

319 if offset & 1: 

320 read(1) # padding 

321 

322 return tiles 

323 

324 

325# -------------------------------------------------------------------- 

326# registry 

327 

328 

329Image.register_open(PsdImageFile.format, PsdImageFile, _accept) 

330 

331Image.register_extension(PsdImageFile.format, ".psd") 

332 

333Image.register_mime(PsdImageFile.format, "image/vnd.adobe.photoshop")