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325 lines
9.9 KiB
Python
325 lines
9.9 KiB
Python
5 years ago
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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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# Windows Icon support for PIL
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#
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# History:
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# 96-05-27 fl Created
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#
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# Copyright (c) Secret Labs AB 1997.
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# Copyright (c) Fredrik Lundh 1996.
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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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# This plugin is a refactored version of Win32IconImagePlugin by Bryan Davis
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# <casadebender@gmail.com>.
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# https://code.google.com/archive/p/casadebender/wikis/Win32IconImagePlugin.wiki
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#
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# Icon format references:
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# * https://en.wikipedia.org/wiki/ICO_(file_format)
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# * https://msdn.microsoft.com/en-us/library/ms997538.aspx
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import struct
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import warnings
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from io import BytesIO
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from math import ceil, log
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from . import BmpImagePlugin, Image, ImageFile, PngImagePlugin
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from ._binary import i8, i16le as i16, i32le as i32
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#
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# --------------------------------------------------------------------
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_MAGIC = b"\0\0\1\0"
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def _save(im, fp, filename):
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fp.write(_MAGIC) # (2+2)
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sizes = im.encoderinfo.get(
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"sizes",
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[(16, 16), (24, 24), (32, 32), (48, 48), (64, 64), (128, 128), (256, 256)],
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)
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width, height = im.size
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sizes = filter(
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lambda x: False
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if (x[0] > width or x[1] > height or x[0] > 256 or x[1] > 256)
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else True,
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sizes,
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)
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sizes = list(sizes)
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fp.write(struct.pack("<H", len(sizes))) # idCount(2)
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offset = fp.tell() + len(sizes) * 16
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for size in sizes:
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width, height = size
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# 0 means 256
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fp.write(struct.pack("B", width if width < 256 else 0)) # bWidth(1)
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fp.write(struct.pack("B", height if height < 256 else 0)) # bHeight(1)
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fp.write(b"\0") # bColorCount(1)
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fp.write(b"\0") # bReserved(1)
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fp.write(b"\0\0") # wPlanes(2)
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fp.write(struct.pack("<H", 32)) # wBitCount(2)
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image_io = BytesIO()
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# TODO: invent a more convenient method for proportional scalings
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tmp = im.copy()
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tmp.thumbnail(size, Image.LANCZOS, reducing_gap=None)
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tmp.save(image_io, "png")
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image_io.seek(0)
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image_bytes = image_io.read()
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bytes_len = len(image_bytes)
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fp.write(struct.pack("<I", bytes_len)) # dwBytesInRes(4)
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fp.write(struct.pack("<I", offset)) # dwImageOffset(4)
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current = fp.tell()
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fp.seek(offset)
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fp.write(image_bytes)
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offset = offset + bytes_len
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fp.seek(current)
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def _accept(prefix):
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return prefix[:4] == _MAGIC
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class IcoFile:
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def __init__(self, buf):
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"""
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Parse image from file-like object containing ico file data
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"""
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# check magic
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s = buf.read(6)
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if not _accept(s):
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raise SyntaxError("not an ICO file")
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self.buf = buf
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self.entry = []
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# Number of items in file
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self.nb_items = i16(s[4:])
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# Get headers for each item
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for i in range(self.nb_items):
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s = buf.read(16)
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icon_header = {
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"width": i8(s[0]),
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"height": i8(s[1]),
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"nb_color": i8(s[2]), # No. of colors in image (0 if >=8bpp)
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"reserved": i8(s[3]),
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"planes": i16(s[4:]),
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"bpp": i16(s[6:]),
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"size": i32(s[8:]),
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"offset": i32(s[12:]),
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}
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# See Wikipedia
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for j in ("width", "height"):
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if not icon_header[j]:
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icon_header[j] = 256
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# See Wikipedia notes about color depth.
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# We need this just to differ images with equal sizes
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icon_header["color_depth"] = (
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icon_header["bpp"]
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or (
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icon_header["nb_color"] != 0
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and ceil(log(icon_header["nb_color"], 2))
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)
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or 256
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)
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icon_header["dim"] = (icon_header["width"], icon_header["height"])
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icon_header["square"] = icon_header["width"] * icon_header["height"]
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self.entry.append(icon_header)
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self.entry = sorted(self.entry, key=lambda x: x["color_depth"])
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# ICO images are usually squares
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# self.entry = sorted(self.entry, key=lambda x: x['width'])
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self.entry = sorted(self.entry, key=lambda x: x["square"])
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self.entry.reverse()
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def sizes(self):
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"""
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Get a list of all available icon sizes and color depths.
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"""
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return {(h["width"], h["height"]) for h in self.entry}
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def getentryindex(self, size, bpp=False):
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for (i, h) in enumerate(self.entry):
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if size == h["dim"] and (bpp is False or bpp == h["color_depth"]):
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return i
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return 0
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def getimage(self, size, bpp=False):
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"""
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Get an image from the icon
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"""
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return self.frame(self.getentryindex(size, bpp))
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def frame(self, idx):
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"""
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Get an image from frame idx
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"""
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header = self.entry[idx]
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self.buf.seek(header["offset"])
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data = self.buf.read(8)
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self.buf.seek(header["offset"])
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if data[:8] == PngImagePlugin._MAGIC:
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# png frame
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im = PngImagePlugin.PngImageFile(self.buf)
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else:
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# XOR + AND mask bmp frame
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im = BmpImagePlugin.DibImageFile(self.buf)
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Image._decompression_bomb_check(im.size)
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# change tile dimension to only encompass XOR image
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im._size = (im.size[0], int(im.size[1] / 2))
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d, e, o, a = im.tile[0]
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im.tile[0] = d, (0, 0) + im.size, o, a
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# figure out where AND mask image starts
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mode = a[0]
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bpp = 8
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for k, v in BmpImagePlugin.BIT2MODE.items():
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if mode == v[1]:
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bpp = k
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break
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if 32 == bpp:
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# 32-bit color depth icon image allows semitransparent areas
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# PIL's DIB format ignores transparency bits, recover them.
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# The DIB is packed in BGRX byte order where X is the alpha
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# channel.
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# Back up to start of bmp data
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self.buf.seek(o)
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# extract every 4th byte (eg. 3,7,11,15,...)
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alpha_bytes = self.buf.read(im.size[0] * im.size[1] * 4)[3::4]
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# convert to an 8bpp grayscale image
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mask = Image.frombuffer(
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"L", # 8bpp
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im.size, # (w, h)
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alpha_bytes, # source chars
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"raw", # raw decoder
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("L", 0, -1), # 8bpp inverted, unpadded, reversed
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)
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else:
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# get AND image from end of bitmap
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w = im.size[0]
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if (w % 32) > 0:
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# bitmap row data is aligned to word boundaries
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w += 32 - (im.size[0] % 32)
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# the total mask data is
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# padded row size * height / bits per char
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and_mask_offset = o + int(im.size[0] * im.size[1] * (bpp / 8.0))
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total_bytes = int((w * im.size[1]) / 8)
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self.buf.seek(and_mask_offset)
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mask_data = self.buf.read(total_bytes)
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# convert raw data to image
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mask = Image.frombuffer(
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"1", # 1 bpp
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im.size, # (w, h)
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mask_data, # source chars
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"raw", # raw decoder
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("1;I", int(w / 8), -1), # 1bpp inverted, padded, reversed
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)
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# now we have two images, im is XOR image and mask is AND image
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# apply mask image as alpha channel
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im = im.convert("RGBA")
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im.putalpha(mask)
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return im
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##
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# Image plugin for Windows Icon files.
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class IcoImageFile(ImageFile.ImageFile):
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"""
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PIL read-only image support for Microsoft Windows .ico files.
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By default the largest resolution image in the file will be loaded. This
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can be changed by altering the 'size' attribute before calling 'load'.
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The info dictionary has a key 'sizes' that is a list of the sizes available
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in the icon file.
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Handles classic, XP and Vista icon formats.
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When saving, PNG compression is used. Support for this was only added in
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Windows Vista.
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This plugin is a refactored version of Win32IconImagePlugin by Bryan Davis
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<casadebender@gmail.com>.
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https://code.google.com/archive/p/casadebender/wikis/Win32IconImagePlugin.wiki
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"""
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format = "ICO"
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format_description = "Windows Icon"
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def _open(self):
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self.ico = IcoFile(self.fp)
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self.info["sizes"] = self.ico.sizes()
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self.size = self.ico.entry[0]["dim"]
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self.load()
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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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if value not in self.info["sizes"]:
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raise ValueError("This is not one of the allowed sizes of this image")
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self._size = value
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def load(self):
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if self.im and self.im.size == self.size:
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# Already loaded
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return
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im = self.ico.getimage(self.size)
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# if tile is PNG, it won't really be loaded yet
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im.load()
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self.im = im.im
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self.mode = im.mode
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if im.size != self.size:
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warnings.warn("Image was not the expected size")
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index = self.ico.getentryindex(self.size)
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sizes = list(self.info["sizes"])
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sizes[index] = im.size
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self.info["sizes"] = set(sizes)
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self.size = im.size
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def load_seek(self):
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# Flag the ImageFile.Parser so that it
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# just does all the decode at the end.
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pass
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#
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# --------------------------------------------------------------------
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Image.register_open(IcoImageFile.format, IcoImageFile, _accept)
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Image.register_save(IcoImageFile.format, _save)
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Image.register_extension(IcoImageFile.format, ".ico")
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Image.register_mime(IcoImageFile.format, "image/x-icon")
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