288 lines
7.8 KiB
Python
288 lines
7.8 KiB
Python
# Copyright (C) 2010 Alex Yatskov
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import os
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from PIL import Image, ImageDraw, ImageStat, ImageChops
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class ImageFlags:
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Orient = 1 << 0
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Resize = 1 << 1
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Frame = 1 << 2
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Quantize = 1 << 3
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Stretch = 1 << 4
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SplitRightLeft = 1 << 5 # split right then left
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SplitRight = 1 << 6 # split only the right page
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SplitLeft = 1 << 7 # split only the left page
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SplitLeftRight = 1 << 8 # split left then right page
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AutoCrop = 1 << 9
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class KindleData:
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Palette4 = [
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0x00, 0x00, 0x00,
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0x55, 0x55, 0x55,
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0xaa, 0xaa, 0xaa,
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0xff, 0xff, 0xff
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]
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Palette15a = [
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0x00, 0x00, 0x00,
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0x11, 0x11, 0x11,
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0x22, 0x22, 0x22,
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0x33, 0x33, 0x33,
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0x44, 0x44, 0x44,
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0x55, 0x55, 0x55,
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0x66, 0x66, 0x66,
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0x77, 0x77, 0x77,
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0x88, 0x88, 0x88,
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0x99, 0x99, 0x99,
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0xaa, 0xaa, 0xaa,
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0xbb, 0xbb, 0xbb,
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0xcc, 0xcc, 0xcc,
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0xdd, 0xdd, 0xdd,
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0xff, 0xff, 0xff,
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]
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Palette15b = [
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0x00, 0x00, 0x00,
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0x11, 0x11, 0x11,
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0x22, 0x22, 0x22,
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0x33, 0x33, 0x33,
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0x44, 0x44, 0x44,
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0x55, 0x55, 0x55,
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0x77, 0x77, 0x77,
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0x88, 0x88, 0x88,
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0x99, 0x99, 0x99,
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0xaa, 0xaa, 0xaa,
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0xbb, 0xbb, 0xbb,
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0xcc, 0xcc, 0xcc,
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0xdd, 0xdd, 0xdd,
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0xee, 0xee, 0xee,
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0xff, 0xff, 0xff,
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]
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Profiles = {
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'Kindle 1': ((600, 800), Palette4),
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'Kindle 2/3/Touch': ((600, 800), Palette15a),
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'Kindle 4 & 5': ((600, 800), Palette15b),
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'Kindle DX/DXG': ((824, 1200), Palette15a),
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'Kindle Paperwhite 1 & 2': ((758, 1024), Palette15b),
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'Kindle Paperwhite 3/Voyage/Oasis': ((1072, 1448), Palette15b),
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'Kobo Mini/Touch': ((600, 800), Palette15b),
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'Kobo Glo': ((768, 1024), Palette15b),
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'Kobo Glo HD': ((1072, 1448), Palette15b),
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'Kobo Aura': ((758, 1024), Palette15b),
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'Kobo Aura HD': ((1080, 1440), Palette15b),
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'Kobo Aura H2O': ((1080, 1430), Palette15a),
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}
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# decorate a function that use image, *** and if there
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# is an exception raise by PIL (IOError) then return
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# the original image because PIL cannot manage it
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def protect_bad_image(func):
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def func_wrapper(*args, **kwargs):
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# If cannot convert (like a bogus image) return the original one
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# args will be "image" and other params are after
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try:
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return func(*args, **kwargs)
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except IOError: # Exception from PIL about bad image
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return args[0]
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return func_wrapper
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@protect_bad_image
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def splitLeft(image):
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widthImg, heightImg = image.size
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return image.crop((0, 0, widthImg / 2, heightImg))
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@protect_bad_image
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def splitRight(image):
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widthImg, heightImg = image.size
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return image.crop((widthImg / 2, 0, widthImg, heightImg))
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@protect_bad_image
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def quantizeImage(image, palette):
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colors = len(palette) / 3
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if colors < 256:
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palette = palette + palette[:3] * (256 - colors)
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palImg = Image.new('P', (1, 1))
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palImg.putpalette(palette)
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return image.quantize(palette=palImg)
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@protect_bad_image
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def stretchImage(image, size):
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widthDev, heightDev = size
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return image.resize((widthDev, heightDev), Image.ANTIALIAS)
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@protect_bad_image
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def resizeImage(image, size):
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widthDev, heightDev = size
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widthImg, heightImg = image.size
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if widthImg <= widthDev and heightImg <= heightDev:
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return image
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ratioImg = float(widthImg) / float(heightImg)
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ratioWidth = float(widthImg) / float(widthDev)
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ratioHeight = float(heightImg) / float(heightDev)
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if ratioWidth > ratioHeight:
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widthImg = widthDev
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heightImg = int(widthDev / ratioImg)
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elif ratioWidth < ratioHeight:
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heightImg = heightDev
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widthImg = int(heightDev * ratioImg)
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else:
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widthImg, heightImg = size
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return image.resize((widthImg, heightImg), Image.ANTIALIAS)
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@protect_bad_image
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def formatImage(image):
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if image.mode == 'RGB':
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return image
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return image.convert('RGB')
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@protect_bad_image
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def orientImage(image, size):
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widthDev, heightDev = size
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widthImg, heightImg = image.size
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if (widthImg > heightImg) != (widthDev > heightDev):
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return image.rotate(90, Image.BICUBIC, True)
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return image
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# We will auto crop the image, by removing just white part around the image
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# by inverting colors, and asking a bounder box ^^
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@protect_bad_image
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def autoCropImage(image):
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try:
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x0, y0, xend, yend = ImageChops.invert(image).getbbox()
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except TypeError: # bad image, specific to chops
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return image
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image = image.crop((x0, y0, xend, yend))
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return image
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def frameImage(image, foreground, background, size):
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widthDev, heightDev = size
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widthImg, heightImg = image.size
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pastePt = (
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max(0, (widthDev - widthImg) / 2),
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max(0, (heightDev - heightImg) / 2)
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)
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corner1 = (
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pastePt[0] - 1,
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pastePt[1] - 1
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)
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corner2 = (
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pastePt[0] + widthImg + 1,
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pastePt[1] + heightImg + 1
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)
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imageBg = Image.new(image.mode, size, background)
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imageBg.paste(image, pastePt)
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draw = ImageDraw.Draw(imageBg)
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draw.rectangle([corner1, corner2], outline=foreground)
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return imageBg
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def loadImage(source):
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try:
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return Image.open(source)
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except IOError:
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raise RuntimeError('Cannot read image file %s' % source)
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def saveImage(image, target):
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try:
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image.save(target)
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except IOError:
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raise RuntimeError('Cannot write image file %s' % target)
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# Look if the image is more width than hight, if not, means
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# it's should not be split (like the front page of a manga,
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# when all the inner pages are double)
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def isSplitable(source):
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image = loadImage(source)
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try:
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widthImg, heightImg = image.size
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return widthImg > heightImg
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except IOError:
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raise RuntimeError('Cannot read image file %s' % source)
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def convertImage(source, target, device, flags):
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try:
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size, palette = KindleData.Profiles[device]
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except KeyError:
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raise RuntimeError('Unexpected output device %s' % device)
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# Load image from source path
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image = loadImage(source)
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# Format according to palette
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image = formatImage(image)
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# Apply flag transforms
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if flags & ImageFlags.SplitRight:
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image = splitRight(image)
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if flags & ImageFlags.SplitRightLeft:
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image = splitLeft(image)
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if flags & ImageFlags.SplitLeft:
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image = splitLeft(image)
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if flags & ImageFlags.SplitLeftRight:
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image = splitRight(image)
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# Auto crop the image, but before manage size and co, clean the source so
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if flags & ImageFlags.AutoCrop:
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image = autoCropImage(image)
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if flags & ImageFlags.Orient:
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image = orientImage(image, size)
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if flags & ImageFlags.Resize:
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image = resizeImage(image, size)
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if flags & ImageFlags.Stretch:
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image = stretchImage(image, size)
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if flags & ImageFlags.Frame:
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image = frameImage(image, tuple(palette[:3]), tuple(palette[-3:]), size)
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if flags & ImageFlags.Quantize:
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image = quantizeImage(image, palette)
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saveImage(image, target)
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