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243 lines
6.5 KiB
Python
243 lines
6.5 KiB
Python
#
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# THIS IS WORK IN PROGRESS
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#
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# The Python Imaging Library.
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# $Id$
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#
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# FlashPix support for PIL
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#
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# History:
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# 97-01-25 fl Created (reads uncompressed RGB images only)
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#
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# Copyright (c) Secret Labs AB 1997.
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# Copyright (c) Fredrik Lundh 1997.
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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 olefile
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from . import Image, ImageFile
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from ._binary import i8, i32le as i32
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# we map from colour field tuples to (mode, rawmode) descriptors
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MODES = {
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# opacity
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(0x00007FFE): ("A", "L"),
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# monochrome
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(0x00010000,): ("L", "L"),
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(0x00018000, 0x00017FFE): ("RGBA", "LA"),
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# photo YCC
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(0x00020000, 0x00020001, 0x00020002): ("RGB", "YCC;P"),
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(0x00028000, 0x00028001, 0x00028002, 0x00027FFE): ("RGBA", "YCCA;P"),
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# standard RGB (NIFRGB)
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(0x00030000, 0x00030001, 0x00030002): ("RGB", "RGB"),
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(0x00038000, 0x00038001, 0x00038002, 0x00037FFE): ("RGBA", "RGBA"),
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}
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#
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# --------------------------------------------------------------------
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def _accept(prefix):
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return prefix[:8] == olefile.MAGIC
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##
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# Image plugin for the FlashPix images.
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class FpxImageFile(ImageFile.ImageFile):
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format = "FPX"
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format_description = "FlashPix"
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def _open(self):
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#
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# read the OLE directory and see if this is a likely
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# to be a FlashPix file
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try:
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self.ole = olefile.OleFileIO(self.fp)
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except OSError:
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raise SyntaxError("not an FPX file; invalid OLE file")
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if self.ole.root.clsid != "56616700-C154-11CE-8553-00AA00A1F95B":
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raise SyntaxError("not an FPX file; bad root CLSID")
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self._open_index(1)
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def _open_index(self, index=1):
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#
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# get the Image Contents Property Set
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prop = self.ole.getproperties(
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["Data Object Store %06d" % index, "\005Image Contents"]
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)
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# size (highest resolution)
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self._size = prop[0x1000002], prop[0x1000003]
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size = max(self.size)
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i = 1
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while size > 64:
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size = size / 2
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i += 1
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self.maxid = i - 1
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# mode. instead of using a single field for this, flashpix
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# requires you to specify the mode for each channel in each
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# resolution subimage, and leaves it to the decoder to make
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# sure that they all match. for now, we'll cheat and assume
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# that this is always the case.
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id = self.maxid << 16
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s = prop[0x2000002 | id]
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colors = []
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bands = i32(s, 4)
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if bands > 4:
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raise IOError("Invalid number of bands")
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for i in range(bands):
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# note: for now, we ignore the "uncalibrated" flag
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colors.append(i32(s, 8 + i * 4) & 0x7FFFFFFF)
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self.mode, self.rawmode = MODES[tuple(colors)]
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# load JPEG tables, if any
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self.jpeg = {}
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for i in range(256):
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id = 0x3000001 | (i << 16)
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if id in prop:
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self.jpeg[i] = prop[id]
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self._open_subimage(1, self.maxid)
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def _open_subimage(self, index=1, subimage=0):
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#
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# setup tile descriptors for a given subimage
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stream = [
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"Data Object Store %06d" % index,
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"Resolution %04d" % subimage,
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"Subimage 0000 Header",
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]
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fp = self.ole.openstream(stream)
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# skip prefix
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fp.read(28)
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# header stream
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s = fp.read(36)
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size = i32(s, 4), i32(s, 8)
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# tilecount = i32(s, 12)
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tilesize = i32(s, 16), i32(s, 20)
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# channels = i32(s, 24)
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offset = i32(s, 28)
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length = i32(s, 32)
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if size != self.size:
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raise OSError("subimage mismatch")
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# get tile descriptors
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fp.seek(28 + offset)
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s = fp.read(i32(s, 12) * length)
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x = y = 0
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xsize, ysize = size
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xtile, ytile = tilesize
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self.tile = []
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for i in range(0, len(s), length):
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compression = i32(s, i + 8)
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if compression == 0:
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self.tile.append(
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(
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"raw",
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(x, y, x + xtile, y + ytile),
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i32(s, i) + 28,
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(self.rawmode),
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)
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)
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elif compression == 1:
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# FIXME: the fill decoder is not implemented
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self.tile.append(
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(
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"fill",
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(x, y, x + xtile, y + ytile),
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i32(s, i) + 28,
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(self.rawmode, s[12:16]),
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)
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)
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elif compression == 2:
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internal_color_conversion = i8(s[14])
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jpeg_tables = i8(s[15])
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rawmode = self.rawmode
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if internal_color_conversion:
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# The image is stored as usual (usually YCbCr).
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if rawmode == "RGBA":
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# For "RGBA", data is stored as YCbCrA based on
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# negative RGB. The following trick works around
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# this problem :
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jpegmode, rawmode = "YCbCrK", "CMYK"
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else:
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jpegmode = None # let the decoder decide
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else:
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# The image is stored as defined by rawmode
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jpegmode = rawmode
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self.tile.append(
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(
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"jpeg",
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(x, y, x + xtile, y + ytile),
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i32(s, i) + 28,
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(rawmode, jpegmode),
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)
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)
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# FIXME: jpeg tables are tile dependent; the prefix
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# data must be placed in the tile descriptor itself!
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if jpeg_tables:
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self.tile_prefix = self.jpeg[jpeg_tables]
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else:
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raise OSError("unknown/invalid compression")
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x = x + xtile
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if x >= xsize:
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x, y = 0, y + ytile
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if y >= ysize:
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break # isn't really required
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self.stream = stream
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self.fp = None
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def load(self):
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if not self.fp:
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self.fp = self.ole.openstream(self.stream[:2] + ["Subimage 0000 Data"])
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return ImageFile.ImageFile.load(self)
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#
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# --------------------------------------------------------------------
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Image.register_open(FpxImageFile.format, FpxImageFile, _accept)
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Image.register_extension(FpxImageFile.format, ".fpx")
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