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304 lines
7.4 KiB
Python
304 lines
7.4 KiB
Python
#
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# The Python Imaging Library
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# $Id$
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#
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# Adobe PSD 2.5/3.0 file handling
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#
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# History:
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# 1995-09-01 fl Created
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# 1997-01-03 fl Read most PSD images
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# 1997-01-18 fl Fixed P and CMYK support
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# 2001-10-21 fl Added seek/tell support (for layers)
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#
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# Copyright (c) 1997-2001 by Secret Labs AB.
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# Copyright (c) 1995-2001 by Fredrik Lundh
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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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import io
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from . import Image, ImageFile, ImagePalette
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from ._binary import i8
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from ._binary import i16be as i16
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from ._binary import i32be as i32
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from ._binary import si16be as si16
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MODES = {
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# (photoshop mode, bits) -> (pil mode, required channels)
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(0, 1): ("1", 1),
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(0, 8): ("L", 1),
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(1, 8): ("L", 1),
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(2, 8): ("P", 1),
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(3, 8): ("RGB", 3),
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(4, 8): ("CMYK", 4),
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(7, 8): ("L", 1), # FIXME: multilayer
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(8, 8): ("L", 1), # duotone
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(9, 8): ("LAB", 3),
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}
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# --------------------------------------------------------------------.
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# read PSD images
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def _accept(prefix):
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return prefix[:4] == b"8BPS"
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##
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# Image plugin for Photoshop images.
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class PsdImageFile(ImageFile.ImageFile):
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format = "PSD"
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format_description = "Adobe Photoshop"
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_close_exclusive_fp_after_loading = False
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def _open(self):
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read = self.fp.read
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#
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# header
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s = read(26)
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if not _accept(s) or i16(s, 4) != 1:
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msg = "not a PSD file"
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raise SyntaxError(msg)
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psd_bits = i16(s, 22)
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psd_channels = i16(s, 12)
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psd_mode = i16(s, 24)
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mode, channels = MODES[(psd_mode, psd_bits)]
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if channels > psd_channels:
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msg = "not enough channels"
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raise OSError(msg)
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if mode == "RGB" and psd_channels == 4:
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mode = "RGBA"
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channels = 4
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self.mode = mode
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self._size = i32(s, 18), i32(s, 14)
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#
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# color mode data
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size = i32(read(4))
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if size:
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data = read(size)
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if mode == "P" and size == 768:
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self.palette = ImagePalette.raw("RGB;L", data)
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#
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# image resources
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self.resources = []
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size = i32(read(4))
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if size:
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# load resources
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end = self.fp.tell() + size
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while self.fp.tell() < end:
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read(4) # signature
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id = i16(read(2))
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name = read(i8(read(1)))
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if not (len(name) & 1):
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read(1) # padding
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data = read(i32(read(4)))
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if len(data) & 1:
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read(1) # padding
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self.resources.append((id, name, data))
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if id == 1039: # ICC profile
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self.info["icc_profile"] = data
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#
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# layer and mask information
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self.layers = []
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size = i32(read(4))
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if size:
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end = self.fp.tell() + size
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size = i32(read(4))
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if size:
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_layer_data = io.BytesIO(ImageFile._safe_read(self.fp, size))
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self.layers = _layerinfo(_layer_data, size)
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self.fp.seek(end)
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self.n_frames = len(self.layers)
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self.is_animated = self.n_frames > 1
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#
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# image descriptor
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self.tile = _maketile(self.fp, mode, (0, 0) + self.size, channels)
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# keep the file open
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self._fp = self.fp
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self.frame = 1
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self._min_frame = 1
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def seek(self, layer):
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if not self._seek_check(layer):
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return
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# seek to given layer (1..max)
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try:
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name, mode, bbox, tile = self.layers[layer - 1]
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self.mode = mode
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self.tile = tile
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self.frame = layer
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self.fp = self._fp
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return name, bbox
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except IndexError as e:
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msg = "no such layer"
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raise EOFError(msg) from e
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def tell(self):
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# return layer number (0=image, 1..max=layers)
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return self.frame
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def _layerinfo(fp, ct_bytes):
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# read layerinfo block
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layers = []
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def read(size):
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return ImageFile._safe_read(fp, size)
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ct = si16(read(2))
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# sanity check
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if ct_bytes < (abs(ct) * 20):
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msg = "Layer block too short for number of layers requested"
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raise SyntaxError(msg)
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for _ in range(abs(ct)):
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# bounding box
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y0 = i32(read(4))
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x0 = i32(read(4))
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y1 = i32(read(4))
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x1 = i32(read(4))
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# image info
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mode = []
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ct_types = i16(read(2))
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types = list(range(ct_types))
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if len(types) > 4:
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continue
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for _ in types:
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type = i16(read(2))
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if type == 65535:
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m = "A"
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else:
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m = "RGBA"[type]
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mode.append(m)
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read(4) # size
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# figure out the image mode
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mode.sort()
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if mode == ["R"]:
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mode = "L"
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elif mode == ["B", "G", "R"]:
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mode = "RGB"
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elif mode == ["A", "B", "G", "R"]:
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mode = "RGBA"
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else:
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mode = None # unknown
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# skip over blend flags and extra information
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read(12) # filler
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name = ""
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size = i32(read(4)) # length of the extra data field
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if size:
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data_end = fp.tell() + size
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length = i32(read(4))
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if length:
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fp.seek(length - 16, io.SEEK_CUR)
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length = i32(read(4))
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if length:
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fp.seek(length, io.SEEK_CUR)
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length = i8(read(1))
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if length:
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# Don't know the proper encoding,
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# Latin-1 should be a good guess
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name = read(length).decode("latin-1", "replace")
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fp.seek(data_end)
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layers.append((name, mode, (x0, y0, x1, y1)))
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# get tiles
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for i, (name, mode, bbox) in enumerate(layers):
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tile = []
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for m in mode:
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t = _maketile(fp, m, bbox, 1)
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if t:
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tile.extend(t)
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layers[i] = name, mode, bbox, tile
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return layers
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def _maketile(file, mode, bbox, channels):
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tile = None
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read = file.read
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compression = i16(read(2))
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xsize = bbox[2] - bbox[0]
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ysize = bbox[3] - bbox[1]
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offset = file.tell()
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if compression == 0:
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#
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# raw compression
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tile = []
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for channel in range(channels):
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layer = mode[channel]
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if mode == "CMYK":
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layer += ";I"
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tile.append(("raw", bbox, offset, layer))
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offset = offset + xsize * ysize
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elif compression == 1:
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#
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# packbits compression
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i = 0
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tile = []
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bytecount = read(channels * ysize * 2)
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offset = file.tell()
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for channel in range(channels):
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layer = mode[channel]
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if mode == "CMYK":
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layer += ";I"
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tile.append(("packbits", bbox, offset, layer))
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for y in range(ysize):
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offset = offset + i16(bytecount, i)
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i += 2
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file.seek(offset)
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if offset & 1:
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read(1) # padding
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return tile
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# --------------------------------------------------------------------
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# registry
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Image.register_open(PsdImageFile.format, PsdImageFile, _accept)
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Image.register_extension(PsdImageFile.format, ".psd")
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Image.register_mime(PsdImageFile.format, "image/vnd.adobe.photoshop")
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