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https://github.com/janeczku/calibre-web
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Solve cropped image pdf import (#1068)
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@ -20,6 +20,7 @@
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from __future__ import division, print_function, unicode_literals
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import os
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import hashlib
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import struct
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from tempfile import gettempdir
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from flask_babel import gettext as _
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@ -148,6 +149,23 @@ def pdf_meta(tmp_file_path, original_file_name, original_file_extension):
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def CMYKInvert(img):
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return Image.merge(img.mode,[ImageOps.invert(b.convert('L')) for b in img.split()])
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def tiff_header_for_CCITT(width, height, img_size, CCITT_group=4):
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tiff_header_struct = '<' + '2s' + 'h' + 'l' + 'h' + 'hhll' * 8 + 'h'
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return struct.pack(tiff_header_struct,
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b'II', # Byte order indication: Little indian
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42, # Version number (always 42)
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8, # Offset to first IFD
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8, # Number of tags in IFD
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256, 4, 1, width, # ImageWidth, LONG, 1, width
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257, 4, 1, height, # ImageLength, LONG, 1, lenght
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258, 3, 1, 1, # BitsPerSample, SHORT, 1, 1
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259, 3, 1, CCITT_group, # Compression, SHORT, 1, 4 = CCITT Group 4 fax encoding
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262, 3, 1, 0, # Threshholding, SHORT, 1, 0 = WhiteIsZero
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273, 4, 1, struct.calcsize(tiff_header_struct), # StripOffsets, LONG, 1, len of header
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278, 4, 1, height, # RowsPerStrip, LONG, 1, lenght
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279, 4, 1, img_size, # StripByteCounts, LONG, 1, size of image
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0 # last IFD
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)
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def pdf_preview(tmp_file_path, tmp_dir):
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if use_generic_pdf_cover:
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@ -157,12 +175,14 @@ def pdf_preview(tmp_file_path, tmp_dir):
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try:
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input1 = PdfFileReader(open(tmp_file_path, 'rb'), strict=False)
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page0 = input1.getPage(0)
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mediaBox = page0['/MediaBox']
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box = page0['/CropBox'] if '/CropBox' in page0 else mediaBox
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xObject = page0['/Resources']['/XObject'].getObject()
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for obj in xObject:
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if xObject[obj]['/Subtype'] == '/Image':
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size = (xObject[obj]['/Width'], xObject[obj]['/Height'])
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data = xObject[obj]._data # xObject[obj].getData()
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data = xObject[obj]._data
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mode = "P"
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if xObject[obj]['/ColorSpace'] == '/DeviceRGB':
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mode = "RGB"
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@ -180,20 +200,52 @@ def pdf_preview(tmp_file_path, tmp_dir):
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img = open(cover_file_name, "wb")
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img.write(data)
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img.close()
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# Post processing
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img2 = Image.open(cover_file_name)
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width, height = img2.size
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if mode == 'CMYK':
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img2 = Image.open(cover_file_name)# .convert('RGB')
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img2 = CMYKInvert(img2)
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img2.save(cover_file_name)
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img2 = img2.crop((box[0]/mediaBox[2]*width,
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box[1]/mediaBox[3]*height,
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box[2]/mediaBox[2]*width,
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box[3]/mediaBox[3]*height))
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img2.save(cover_file_name)
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return cover_file_name
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elif xObject[obj]['/Filter'] == '/JPXDecode':
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cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jp2"
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img = open(cover_file_name, "wb")
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img.write(data)
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img.close()
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# Post processing
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img2 = Image.open(cover_file_name)
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width, height = img2.size
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if mode == 'CMYK':
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img2 = Image.open(cover_file_name)# .convert('RGB')
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img2 = CMYKInvert(img2)
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img2.save(cover_file_name)
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img2 = img2.crop((box[0]/mediaBox[2]*width,
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box[1]/mediaBox[3]*height,
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box[2]/mediaBox[2]*width,
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box[3]/mediaBox[3]*height))
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img2.save(cover_file_name)
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return cover_file_name
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elif xObject[obj]['/Filter'] == '/CCITTFaxDecode':
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if xObject[obj]['/DecodeParms']['/K'] == -1:
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CCITT_group = 4
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else:
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CCITT_group = 3
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width = xObject[obj]['/Width']
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height = xObject[obj]['/Height']
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img_size = len(data)
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tiff_header = tiff_header_for_CCITT(width, height, img_size, CCITT_group)
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cover_file_name_tiff = os.path.splitext(tmp_file_path)[0] + obj[1:] + '.tiff'
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cover_file_name = os.path.splitext(tmp_file_path)[0] + obj[1:] + '.jpg'
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img = open(cover_file_name_tiff, "wb")
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img.write(tiff_header + data)
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img.close()
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# Post processing
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img2 = Image.open(cover_file_name_tiff)
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if img2.mode == '1':
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img2 = ImageOps.invert(img2.convert('RGB'))
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img2.save(cover_file_name)
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return cover_file_name
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else:
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img = Image.frombytes(mode, size, data)
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