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d244fbb299
iter(dict) is equivalent to iter(dict.keys()), so simply act on the dict instead of adding the extra call. Inspired by Lennart Regebro's PyCon 2017 presentation "Prehistoric Patterns in Python". Available at: https://www.youtube.com/watch?v=V5-JH23Vk0I
285 lines
9.1 KiB
Python
285 lines
9.1 KiB
Python
#
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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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from io import BytesIO
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from . import Image, ImageFile, BmpImagePlugin, PngImagePlugin
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from ._binary import i8, i16le as i16, i32le as i32
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from math import log, ceil
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__version__ = "0.1"
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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("sizes",
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[(16, 16), (24, 24), (32, 32), (48, 48),
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(64, 64), (128, 128), (256, 256)])
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width, height = im.size
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sizes = filter(lambda x: False if (x[0] > width or x[1] > height or
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x[0] > 256 or x[1] > 256) else True,
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sizes)
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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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tmp = im.copy()
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tmp.thumbnail(size, Image.LANCZOS)
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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(object):
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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'] = (icon_header['bpp'] or
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(icon_header['nb_color'] != 0 and
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ceil(log(icon_header['nb_color'],
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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'] *
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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 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 is 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, 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] *
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(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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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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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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# 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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