165 lines
4.2 KiB
Python
165 lines
4.2 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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from PIL import Image, ImageDraw
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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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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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Palette15 = [
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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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Profiles = {
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'Kindle 1': ((600, 800), Palette4),
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'Kindle 2': ((600, 800), Palette15),
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'Kindle 3': ((600, 800), Palette15),
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'Kindle DX': ((824, 1200), Palette15),
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'Kindle DXG': ((824, 1200), Palette15)
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}
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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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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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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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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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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 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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try:
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image = 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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image = formatImage(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.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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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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