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