mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-11-14 13:46:57 +03:00
310 lines
7.4 KiB
Python
310 lines
7.4 KiB
Python
#
|
|
# The Python Imaging Library
|
|
# $Id$
|
|
#
|
|
# Adobe PSD 2.5/3.0 file handling
|
|
#
|
|
# History:
|
|
# 1995-09-01 fl Created
|
|
# 1997-01-03 fl Read most PSD images
|
|
# 1997-01-18 fl Fixed P and CMYK support
|
|
# 2001-10-21 fl Added seek/tell support (for layers)
|
|
#
|
|
# Copyright (c) 1997-2001 by Secret Labs AB.
|
|
# Copyright (c) 1995-2001 by Fredrik Lundh
|
|
#
|
|
# See the README file for information on usage and redistribution.
|
|
#
|
|
|
|
import io
|
|
|
|
from . import Image, ImageFile, ImagePalette
|
|
from ._binary import i8, i16be as i16, i32be as i32
|
|
|
|
MODES = {
|
|
# (photoshop mode, bits) -> (pil mode, required channels)
|
|
(0, 1): ("1", 1),
|
|
(0, 8): ("L", 1),
|
|
(1, 8): ("L", 1),
|
|
(2, 8): ("P", 1),
|
|
(3, 8): ("RGB", 3),
|
|
(4, 8): ("CMYK", 4),
|
|
(7, 8): ("L", 1), # FIXME: multilayer
|
|
(8, 8): ("L", 1), # duotone
|
|
(9, 8): ("LAB", 3),
|
|
}
|
|
|
|
|
|
# --------------------------------------------------------------------.
|
|
# read PSD images
|
|
|
|
|
|
def _accept(prefix):
|
|
return prefix[:4] == b"8BPS"
|
|
|
|
|
|
##
|
|
# Image plugin for Photoshop images.
|
|
|
|
|
|
class PsdImageFile(ImageFile.ImageFile):
|
|
|
|
format = "PSD"
|
|
format_description = "Adobe Photoshop"
|
|
_close_exclusive_fp_after_loading = False
|
|
|
|
def _open(self):
|
|
|
|
read = self.fp.read
|
|
|
|
#
|
|
# header
|
|
|
|
s = read(26)
|
|
if not _accept(s) or i16(s[4:]) != 1:
|
|
raise SyntaxError("not a PSD file")
|
|
|
|
psd_bits = i16(s[22:])
|
|
psd_channels = i16(s[12:])
|
|
psd_mode = i16(s[24:])
|
|
|
|
mode, channels = MODES[(psd_mode, psd_bits)]
|
|
|
|
if channels > psd_channels:
|
|
raise OSError("not enough channels")
|
|
|
|
self.mode = mode
|
|
self._size = i32(s[18:]), i32(s[14:])
|
|
|
|
#
|
|
# color mode data
|
|
|
|
size = i32(read(4))
|
|
if size:
|
|
data = read(size)
|
|
if mode == "P" and size == 768:
|
|
self.palette = ImagePalette.raw("RGB;L", data)
|
|
|
|
#
|
|
# image resources
|
|
|
|
self.resources = []
|
|
|
|
size = i32(read(4))
|
|
if size:
|
|
# load resources
|
|
end = self.fp.tell() + size
|
|
while self.fp.tell() < end:
|
|
read(4) # signature
|
|
id = i16(read(2))
|
|
name = read(i8(read(1)))
|
|
if not (len(name) & 1):
|
|
read(1) # padding
|
|
data = read(i32(read(4)))
|
|
if len(data) & 1:
|
|
read(1) # padding
|
|
self.resources.append((id, name, data))
|
|
if id == 1039: # ICC profile
|
|
self.info["icc_profile"] = data
|
|
|
|
#
|
|
# layer and mask information
|
|
|
|
self.layers = []
|
|
|
|
size = i32(read(4))
|
|
if size:
|
|
end = self.fp.tell() + size
|
|
size = i32(read(4))
|
|
if size:
|
|
self.layers = _layerinfo(self.fp)
|
|
self.fp.seek(end)
|
|
self.n_frames = len(self.layers)
|
|
self.is_animated = self.n_frames > 1
|
|
|
|
#
|
|
# image descriptor
|
|
|
|
self.tile = _maketile(self.fp, mode, (0, 0) + self.size, channels)
|
|
|
|
# keep the file open
|
|
self.__fp = self.fp
|
|
self.frame = 1
|
|
self._min_frame = 1
|
|
|
|
def seek(self, layer):
|
|
if not self._seek_check(layer):
|
|
return
|
|
|
|
# seek to given layer (1..max)
|
|
try:
|
|
name, mode, bbox, tile = self.layers[layer - 1]
|
|
self.mode = mode
|
|
self.tile = tile
|
|
self.frame = layer
|
|
self.fp = self.__fp
|
|
return name, bbox
|
|
except IndexError as e:
|
|
raise EOFError("no such layer") from e
|
|
|
|
def tell(self):
|
|
# return layer number (0=image, 1..max=layers)
|
|
return self.frame
|
|
|
|
def load_prepare(self):
|
|
# create image memory if necessary
|
|
if not self.im or self.im.mode != self.mode or self.im.size != self.size:
|
|
self.im = Image.core.fill(self.mode, self.size, 0)
|
|
# create palette (optional)
|
|
if self.mode == "P":
|
|
Image.Image.load(self)
|
|
|
|
def _close__fp(self):
|
|
try:
|
|
if self.__fp != self.fp:
|
|
self.__fp.close()
|
|
except AttributeError:
|
|
pass
|
|
finally:
|
|
self.__fp = None
|
|
|
|
|
|
def _layerinfo(file):
|
|
# read layerinfo block
|
|
layers = []
|
|
read = file.read
|
|
for i in range(abs(i16(read(2)))):
|
|
|
|
# bounding box
|
|
y0 = i32(read(4))
|
|
x0 = i32(read(4))
|
|
y1 = i32(read(4))
|
|
x1 = i32(read(4))
|
|
|
|
# image info
|
|
info = []
|
|
mode = []
|
|
types = list(range(i16(read(2))))
|
|
if len(types) > 4:
|
|
continue
|
|
|
|
for i in types:
|
|
type = i16(read(2))
|
|
|
|
if type == 65535:
|
|
m = "A"
|
|
else:
|
|
m = "RGBA"[type]
|
|
|
|
mode.append(m)
|
|
size = i32(read(4))
|
|
info.append((m, size))
|
|
|
|
# figure out the image mode
|
|
mode.sort()
|
|
if mode == ["R"]:
|
|
mode = "L"
|
|
elif mode == ["B", "G", "R"]:
|
|
mode = "RGB"
|
|
elif mode == ["A", "B", "G", "R"]:
|
|
mode = "RGBA"
|
|
else:
|
|
mode = None # unknown
|
|
|
|
# skip over blend flags and extra information
|
|
read(12) # filler
|
|
name = ""
|
|
size = i32(read(4)) # length of the extra data field
|
|
combined = 0
|
|
if size:
|
|
data_end = file.tell() + size
|
|
|
|
length = i32(read(4))
|
|
if length:
|
|
file.seek(length - 16, io.SEEK_CUR)
|
|
combined += length + 4
|
|
|
|
length = i32(read(4))
|
|
if length:
|
|
file.seek(length, io.SEEK_CUR)
|
|
combined += length + 4
|
|
|
|
length = i8(read(1))
|
|
if length:
|
|
# Don't know the proper encoding,
|
|
# Latin-1 should be a good guess
|
|
name = read(length).decode("latin-1", "replace")
|
|
combined += length + 1
|
|
|
|
file.seek(data_end)
|
|
layers.append((name, mode, (x0, y0, x1, y1)))
|
|
|
|
# get tiles
|
|
i = 0
|
|
for name, mode, bbox in layers:
|
|
tile = []
|
|
for m in mode:
|
|
t = _maketile(file, m, bbox, 1)
|
|
if t:
|
|
tile.extend(t)
|
|
layers[i] = name, mode, bbox, tile
|
|
i += 1
|
|
|
|
return layers
|
|
|
|
|
|
def _maketile(file, mode, bbox, channels):
|
|
|
|
tile = None
|
|
read = file.read
|
|
|
|
compression = i16(read(2))
|
|
|
|
xsize = bbox[2] - bbox[0]
|
|
ysize = bbox[3] - bbox[1]
|
|
|
|
offset = file.tell()
|
|
|
|
if compression == 0:
|
|
#
|
|
# raw compression
|
|
tile = []
|
|
for channel in range(channels):
|
|
layer = mode[channel]
|
|
if mode == "CMYK":
|
|
layer += ";I"
|
|
tile.append(("raw", bbox, offset, layer))
|
|
offset = offset + xsize * ysize
|
|
|
|
elif compression == 1:
|
|
#
|
|
# packbits compression
|
|
i = 0
|
|
tile = []
|
|
bytecount = read(channels * ysize * 2)
|
|
offset = file.tell()
|
|
for channel in range(channels):
|
|
layer = mode[channel]
|
|
if mode == "CMYK":
|
|
layer += ";I"
|
|
tile.append(("packbits", bbox, offset, layer))
|
|
for y in range(ysize):
|
|
offset = offset + i16(bytecount[i : i + 2])
|
|
i += 2
|
|
|
|
file.seek(offset)
|
|
|
|
if offset & 1:
|
|
read(1) # padding
|
|
|
|
return tile
|
|
|
|
|
|
# --------------------------------------------------------------------
|
|
# registry
|
|
|
|
|
|
Image.register_open(PsdImageFile.format, PsdImageFile, _accept)
|
|
|
|
Image.register_extension(PsdImageFile.format, ".psd")
|