401 lines
12 KiB
Python
401 lines
12 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# macOS icns file decoder, based on icns.py by Bob Ippolito.
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#
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# history:
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# 2004-10-09 fl Turned into a PIL plugin; removed 2.3 dependencies.
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# 2020-04-04 Allow saving on all operating systems.
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#
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# Copyright (c) 2004 by Bob Ippolito.
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# Copyright (c) 2004 by Secret Labs.
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# Copyright (c) 2004 by Fredrik Lundh.
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# Copyright (c) 2014 by Alastair Houghton.
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# Copyright (c) 2020 by Pan Jing.
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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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from __future__ import annotations
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import io
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import os
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import struct
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import sys
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from . import Image, ImageFile, PngImagePlugin, features
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enable_jpeg2k = features.check_codec("jpg_2000")
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if enable_jpeg2k:
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from . import Jpeg2KImagePlugin
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MAGIC = b"icns"
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HEADERSIZE = 8
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def nextheader(fobj):
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return struct.unpack(">4sI", fobj.read(HEADERSIZE))
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def read_32t(fobj, start_length, size):
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# The 128x128 icon seems to have an extra header for some reason.
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(start, length) = start_length
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fobj.seek(start)
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sig = fobj.read(4)
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if sig != b"\x00\x00\x00\x00":
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msg = "Unknown signature, expecting 0x00000000"
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raise SyntaxError(msg)
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return read_32(fobj, (start + 4, length - 4), size)
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def read_32(fobj, start_length, size):
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"""
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Read a 32bit RGB icon resource. Seems to be either uncompressed or
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an RLE packbits-like scheme.
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"""
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(start, length) = start_length
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fobj.seek(start)
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pixel_size = (size[0] * size[2], size[1] * size[2])
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sizesq = pixel_size[0] * pixel_size[1]
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if length == sizesq * 3:
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# uncompressed ("RGBRGBGB")
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indata = fobj.read(length)
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im = Image.frombuffer("RGB", pixel_size, indata, "raw", "RGB", 0, 1)
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else:
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# decode image
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im = Image.new("RGB", pixel_size, None)
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for band_ix in range(3):
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data = []
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bytesleft = sizesq
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while bytesleft > 0:
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byte = fobj.read(1)
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if not byte:
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break
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byte = byte[0]
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if byte & 0x80:
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blocksize = byte - 125
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byte = fobj.read(1)
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for i in range(blocksize):
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data.append(byte)
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else:
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blocksize = byte + 1
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data.append(fobj.read(blocksize))
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bytesleft -= blocksize
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if bytesleft <= 0:
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break
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if bytesleft != 0:
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msg = f"Error reading channel [{repr(bytesleft)} left]"
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raise SyntaxError(msg)
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band = Image.frombuffer("L", pixel_size, b"".join(data), "raw", "L", 0, 1)
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im.im.putband(band.im, band_ix)
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return {"RGB": im}
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def read_mk(fobj, start_length, size):
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# Alpha masks seem to be uncompressed
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start = start_length[0]
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fobj.seek(start)
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pixel_size = (size[0] * size[2], size[1] * size[2])
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sizesq = pixel_size[0] * pixel_size[1]
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band = Image.frombuffer("L", pixel_size, fobj.read(sizesq), "raw", "L", 0, 1)
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return {"A": band}
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def read_png_or_jpeg2000(fobj, start_length, size):
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(start, length) = start_length
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fobj.seek(start)
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sig = fobj.read(12)
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if sig[:8] == b"\x89PNG\x0d\x0a\x1a\x0a":
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fobj.seek(start)
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im = PngImagePlugin.PngImageFile(fobj)
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Image._decompression_bomb_check(im.size)
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return {"RGBA": im}
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elif (
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sig[:4] == b"\xff\x4f\xff\x51"
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or sig[:4] == b"\x0d\x0a\x87\x0a"
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or sig == b"\x00\x00\x00\x0cjP \x0d\x0a\x87\x0a"
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):
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if not enable_jpeg2k:
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msg = (
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"Unsupported icon subimage format (rebuild PIL "
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"with JPEG 2000 support to fix this)"
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)
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raise ValueError(msg)
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# j2k, jpc or j2c
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fobj.seek(start)
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jp2kstream = fobj.read(length)
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f = io.BytesIO(jp2kstream)
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im = Jpeg2KImagePlugin.Jpeg2KImageFile(f)
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Image._decompression_bomb_check(im.size)
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if im.mode != "RGBA":
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im = im.convert("RGBA")
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return {"RGBA": im}
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else:
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msg = "Unsupported icon subimage format"
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raise ValueError(msg)
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class IcnsFile:
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SIZES = {
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(512, 512, 2): [(b"ic10", read_png_or_jpeg2000)],
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(512, 512, 1): [(b"ic09", read_png_or_jpeg2000)],
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(256, 256, 2): [(b"ic14", read_png_or_jpeg2000)],
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(256, 256, 1): [(b"ic08", read_png_or_jpeg2000)],
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(128, 128, 2): [(b"ic13", read_png_or_jpeg2000)],
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(128, 128, 1): [
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(b"ic07", read_png_or_jpeg2000),
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(b"it32", read_32t),
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(b"t8mk", read_mk),
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],
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(64, 64, 1): [(b"icp6", read_png_or_jpeg2000)],
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(32, 32, 2): [(b"ic12", read_png_or_jpeg2000)],
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(48, 48, 1): [(b"ih32", read_32), (b"h8mk", read_mk)],
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(32, 32, 1): [
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(b"icp5", read_png_or_jpeg2000),
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(b"il32", read_32),
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(b"l8mk", read_mk),
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],
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(16, 16, 2): [(b"ic11", read_png_or_jpeg2000)],
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(16, 16, 1): [
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(b"icp4", read_png_or_jpeg2000),
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(b"is32", read_32),
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(b"s8mk", read_mk),
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],
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}
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def __init__(self, fobj):
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"""
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fobj is a file-like object as an icns resource
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"""
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# signature : (start, length)
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self.dct = dct = {}
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self.fobj = fobj
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sig, filesize = nextheader(fobj)
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if not _accept(sig):
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msg = "not an icns file"
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raise SyntaxError(msg)
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i = HEADERSIZE
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while i < filesize:
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sig, blocksize = nextheader(fobj)
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if blocksize <= 0:
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msg = "invalid block header"
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raise SyntaxError(msg)
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i += HEADERSIZE
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blocksize -= HEADERSIZE
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dct[sig] = (i, blocksize)
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fobj.seek(blocksize, io.SEEK_CUR)
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i += blocksize
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def itersizes(self):
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sizes = []
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for size, fmts in self.SIZES.items():
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for fmt, reader in fmts:
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if fmt in self.dct:
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sizes.append(size)
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break
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return sizes
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def bestsize(self):
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sizes = self.itersizes()
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if not sizes:
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msg = "No 32bit icon resources found"
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raise SyntaxError(msg)
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return max(sizes)
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def dataforsize(self, size):
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"""
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Get an icon resource as {channel: array}. Note that
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the arrays are bottom-up like windows bitmaps and will likely
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need to be flipped or transposed in some way.
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"""
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dct = {}
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for code, reader in self.SIZES[size]:
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desc = self.dct.get(code)
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if desc is not None:
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dct.update(reader(self.fobj, desc, size))
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return dct
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def getimage(self, size=None):
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if size is None:
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size = self.bestsize()
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if len(size) == 2:
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size = (size[0], size[1], 1)
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channels = self.dataforsize(size)
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im = channels.get("RGBA", None)
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if im:
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return im
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im = channels.get("RGB").copy()
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try:
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im.putalpha(channels["A"])
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except KeyError:
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pass
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return im
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##
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# Image plugin for Mac OS icons.
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class IcnsImageFile(ImageFile.ImageFile):
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"""
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PIL image support for Mac OS .icns files.
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Chooses the best resolution, but will possibly load
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a different size image if you mutate the size attribute
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before calling 'load'.
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The info dictionary has a key 'sizes' that is a list
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of sizes that the icns file has.
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"""
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format = "ICNS"
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format_description = "Mac OS icns resource"
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def _open(self):
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self.icns = IcnsFile(self.fp)
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self._mode = "RGBA"
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self.info["sizes"] = self.icns.itersizes()
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self.best_size = self.icns.bestsize()
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self.size = (
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self.best_size[0] * self.best_size[2],
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self.best_size[1] * self.best_size[2],
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)
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@property
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def size(self):
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return self._size
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@size.setter
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def size(self, value):
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info_size = value
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if info_size not in self.info["sizes"] and len(info_size) == 2:
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info_size = (info_size[0], info_size[1], 1)
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if (
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info_size not in self.info["sizes"]
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and len(info_size) == 3
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and info_size[2] == 1
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):
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simple_sizes = [
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(size[0] * size[2], size[1] * size[2]) for size in self.info["sizes"]
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]
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if value in simple_sizes:
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info_size = self.info["sizes"][simple_sizes.index(value)]
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if info_size not in self.info["sizes"]:
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msg = "This is not one of the allowed sizes of this image"
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raise ValueError(msg)
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self._size = value
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def load(self):
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if len(self.size) == 3:
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self.best_size = self.size
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self.size = (
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self.best_size[0] * self.best_size[2],
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self.best_size[1] * self.best_size[2],
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)
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px = Image.Image.load(self)
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if self.im is not None and self.im.size == self.size:
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# Already loaded
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return px
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self.load_prepare()
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# This is likely NOT the best way to do it, but whatever.
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im = self.icns.getimage(self.best_size)
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# If this is a PNG or JPEG 2000, it won't be loaded yet
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px = im.load()
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self.im = im.im
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self._mode = im.mode
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self.size = im.size
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return px
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def _save(im, fp, filename):
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"""
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Saves the image as a series of PNG files,
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that are then combined into a .icns file.
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"""
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if hasattr(fp, "flush"):
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fp.flush()
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sizes = {
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b"ic07": 128,
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b"ic08": 256,
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b"ic09": 512,
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b"ic10": 1024,
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b"ic11": 32,
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b"ic12": 64,
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b"ic13": 256,
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b"ic14": 512,
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}
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provided_images = {im.width: im for im in im.encoderinfo.get("append_images", [])}
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size_streams = {}
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for size in set(sizes.values()):
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image = (
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provided_images[size]
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if size in provided_images
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else im.resize((size, size))
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)
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temp = io.BytesIO()
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image.save(temp, "png")
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size_streams[size] = temp.getvalue()
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entries = []
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for type, size in sizes.items():
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stream = size_streams[size]
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entries.append(
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{"type": type, "size": HEADERSIZE + len(stream), "stream": stream}
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)
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# Header
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fp.write(MAGIC)
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file_length = HEADERSIZE # Header
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file_length += HEADERSIZE + 8 * len(entries) # TOC
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file_length += sum(entry["size"] for entry in entries)
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fp.write(struct.pack(">i", file_length))
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# TOC
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fp.write(b"TOC ")
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fp.write(struct.pack(">i", HEADERSIZE + len(entries) * HEADERSIZE))
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for entry in entries:
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fp.write(entry["type"])
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fp.write(struct.pack(">i", entry["size"]))
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# Data
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for entry in entries:
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fp.write(entry["type"])
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fp.write(struct.pack(">i", entry["size"]))
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fp.write(entry["stream"])
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if hasattr(fp, "flush"):
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fp.flush()
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def _accept(prefix):
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return prefix[:4] == MAGIC
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Image.register_open(IcnsImageFile.format, IcnsImageFile, _accept)
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Image.register_extension(IcnsImageFile.format, ".icns")
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Image.register_save(IcnsImageFile.format, _save)
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Image.register_mime(IcnsImageFile.format, "image/icns")
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if __name__ == "__main__":
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if len(sys.argv) < 2:
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print("Syntax: python3 IcnsImagePlugin.py [file]")
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sys.exit()
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with open(sys.argv[1], "rb") as fp:
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imf = IcnsImageFile(fp)
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for size in imf.info["sizes"]:
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width, height, scale = imf.size = size
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imf.save(f"out-{width}-{height}-{scale}.png")
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with Image.open(sys.argv[1]) as im:
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im.save("out.png")
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if sys.platform == "windows":
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os.startfile("out.png")
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