119 lines
4 KiB
Python
119 lines
4 KiB
Python
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import tkinter
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import tkinter.messagebox
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import io
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import re
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import PIL.Image
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import xml.etree.ElementTree
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def find_cover_id(book):
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for (id, href, mimetype) in book.manifest_iter():
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properties = book.id_to_properties(id)
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if properties == 'cover-image':
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return id
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metadata = xml.etree.ElementTree.fromstring(book.getmetadataxml())
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cover = [x for x in metadata.findall('meta') if x.get('name') == 'cover']
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if cover:
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return cover[0].get('content')
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return None
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def fit_into_bounds(image_width, image_height, frame_width, frame_height, only_shrink=False):
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'''
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Given the w+h of the image and the w+h of the frame,
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return new w+h that fits the image into the frame
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while maintaining the aspect ratio.
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(1920, 1080, 400, 400) -> (400, 225)
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'''
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width_ratio = frame_width / image_width
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height_ratio = frame_height / image_height
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ratio = min(width_ratio, height_ratio)
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new_width = int(image_width * ratio)
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new_height = int(image_height * ratio)
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if only_shrink and (new_width > image_width or new_height > image_height):
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return (image_width, image_height)
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return (new_width, new_height)
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def collect_images(book, do_cover=False):
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images = []
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if do_cover:
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cover_id = None
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else:
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cover_id = find_cover_id(book)
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for (id, href, mimetype) in book.manifest_iter():
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if id == cover_id:
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continue
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if mimetype == 'image/jpeg':
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images.append(id)
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return images
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def choose_options():
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options = {}
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t = tkinter.Tk()
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t.grid_columnconfigure(1, weight=1)
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t.grid_rowconfigure(3, weight=1)
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t.title('imagecrunch')
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do_cover_intvar = tkinter.IntVar()
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do_cover_intvar.set(1)
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do_cover_checkbox = tkinter.Checkbutton(t, text='Compress the cover?', variable=do_cover_intvar)
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do_cover_checkbox.grid(row=0, column=0, columnspan=2, sticky='w')
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tkinter.Label(t, text='max dimension').grid(row=1, column=0, sticky='w')
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dimension_slider = tkinter.Scale(t, from_=100, to=2000, resolution=10, orient=tkinter.HORIZONTAL)
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dimension_slider.grid(row=1, column=1, sticky='we')
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dimension_slider.set(500)
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tkinter.Label(t, text='jpeg quality').grid(row=2, column=0, sticky='w')
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quality_slider = tkinter.Scale(t, from_=1, to=100, orient=tkinter.HORIZONTAL)
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quality_slider.grid(row=2, column=1, sticky='we')
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quality_slider.set(50)
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def commit():
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options['do_cover'] = do_cover_intvar.get()
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options['quality'] = quality_slider.get()
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options['max_dimension'] = dimension_slider.get()
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t.destroy()
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ok_button = tkinter.Button(t, text='OK', command=commit, bg='#00ff00')
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ok_button.grid(row=3, column=0, columnspan=2, sticky='ews')
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t.mainloop()
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return options
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def imagecrunch(book, options):
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total_original_size = 0
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total_new_size = 0
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for id in collect_images(book, do_cover=options['do_cover']):
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data = io.BytesIO(book.readfile(id))
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original_size = len(data.read())
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total_original_size += original_size
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data.seek(0)
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i = PIL.Image.open(data)
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data = io.BytesIO()
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# i = i.convert('L')
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new_dimension = fit_into_bounds(*i.size, options['max_dimension'], options['max_dimension'], only_shrink=True)
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i = i.resize(new_dimension, resample=PIL.Image.ANTIALIAS)
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i.save(data, format='jpeg', quality=options['quality'])
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data.seek(0)
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new_size = len(data.read())
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if new_size >= original_size:
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total_new_size += original_size
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continue
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total_new_size += new_size
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data.seek(0)
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book.writefile(id, data.read())
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print(id, 'shrunk from', int(original_size / 1024), 'K', 'to', int(new_size / 1024), 'K')
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print('Total shrunk from', int(total_original_size / 1024), 'K', 'to', int(total_new_size / 1024), 'K')
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def run(book):
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options = choose_options()
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print(options)
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if not options:
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return 1
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imagecrunch(book, options)
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return 0
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