234 lines
7.3 KiB
Python
234 lines
7.3 KiB
Python
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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 <casadebender@gmail.com>.
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# https://code.google.com/p/casadebender/wiki/Win32IconImagePlugin
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#
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# Icon format references:
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# * http://en.wikipedia.org/wiki/ICO_(file_format)
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# * http://msdn.microsoft.com/en-us/library/ms997538.aspx
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__version__ = "0.1"
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from PIL import Image, ImageFile, BmpImagePlugin, PngImagePlugin, _binary
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from math import log, ceil
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#
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# --------------------------------------------------------------------
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i8 = _binary.i8
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i16 = _binary.i16le
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i32 = _binary.i32le
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_MAGIC = b"\0\0\1\0"
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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]), # Number 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'] = (icon_header['bpp'] or (icon_header['nb_color'] != 0 and ceil(log(icon_header['nb_color'],2))) or 256)
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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 set((h['width'], h['height']) for h in self.entry)
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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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for (i, h) in enumerate(self.entry):
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if size == h['dim'] and (bpp == False or bpp == h['color_depth']):
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return self.frame(i)
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return self.frame(0)
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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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# 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 in BmpImagePlugin.BIT2MODE.keys():
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if mode == BmpImagePlugin.BIT2MODE[k][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 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 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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maskData = 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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maskData, # 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 can
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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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This plugin is a refactored version of Win32IconImagePlugin by Bryan Davis <casadebender@gmail.com>.
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https://code.google.com/p/casadebender/wiki/Win32IconImagePlugin
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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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def load(self):
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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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self.size = im.size
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def load_seek(self):
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# Flage the ImageFile.Parser so that it 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("ICO", IcoImageFile, _accept)
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Image.register_extension("ICO", ".ico")
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