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https://github.com/gryf/ebook-converter.git
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81 lines
3.3 KiB
Python
81 lines
3.3 KiB
Python
from ebook_converter.utils import img as uimg
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class RescaleImages(object):
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'Rescale all images to fit inside given screen size'
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def __init__(self, check_colorspaces=False):
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self.check_colorspaces = check_colorspaces
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def __call__(self, oeb, opts):
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self.oeb, self.opts, self.log = oeb, opts, oeb.log
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self.rescale()
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def rescale(self):
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from PIL import Image
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from io import BytesIO
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is_image_collection = getattr(self.opts, 'is_image_collection', False)
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if is_image_collection:
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page_width, page_height = self.opts.dest.comic_screen_size
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else:
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page_width, page_height = self.opts.dest.width, self.opts.dest.height
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page_width -= (self.opts.margin_left + self.opts.margin_right) * self.opts.dest.dpi/72
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page_height -= (self.opts.margin_top + self.opts.margin_bottom) * self.opts.dest.dpi/72
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for item in self.oeb.manifest:
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if item.media_type.startswith('image'):
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ext = item.media_type.split('/')[-1].upper()
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if ext == 'JPG':
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ext = 'JPEG'
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if ext not in ('PNG', 'JPEG', 'GIF'):
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ext = 'JPEG'
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raw = item.data
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if hasattr(raw, 'xpath') or not raw:
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# Probably an svg image
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continue
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try:
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img = Image.open(BytesIO(raw))
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except Exception:
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continue
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width, height = img.size
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try:
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if self.check_colorspaces and img.mode == 'CMYK':
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self.log.warning('The image %s is in the CMYK '
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'colorspace, converting it to RGB as '
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'Adobe Digital Editions cannot '
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'display CMYK', item.href)
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img = img.convert('RGB')
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except Exception:
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self.log.exception('Failed to convert image %s from CMYK '
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'to RGB', item.href)
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scaled, new_width, new_height = uimg.fit_image(width, height,
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page_width,
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page_height)
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if scaled:
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new_width = max(1, new_width)
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new_height = max(1, new_height)
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self.log.info('Rescaling image from %dx%d to %dx%d %s',
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width, height, new_width, new_height,
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item.href)
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try:
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img = img.resize((new_width, new_height))
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except Exception:
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self.log.exception('Failed to rescale image: %s',
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item.href)
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continue
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buf = BytesIO()
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try:
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img.save(buf, ext)
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except Exception:
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self.log.exception('Failed to rescale image: %s',
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item.href)
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else:
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item.data = buf.getvalue()
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item.unload_data_from_memory()
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