81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
from PIL import Image
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from django.utils.translation import ugettext_lazy as _
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from converter.literals import QUALITY_DEFAULT, QUALITY_SETTINGS
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from converter.exceptions import ConvertError, UnknownFormat, IdentifyError
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from converter.backends import ConverterBase
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from converter.literals import TRANSFORMATION_RESIZE, \
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TRANSFORMATION_ROTATE
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class ConverterClass(ConverterBase):
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def identify_file(self, input_filepath, arguments=None):
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pass
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def get_page_count(self, input_filepath):
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page_count = 1
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im = Image.open(input_filepath)
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try:
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while 1:
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im.seek(im.tell()+1)
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page_count += 1
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# do something to im
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except EOFError:
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pass # end of sequence
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return page_count
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def convert_file(self, input_filepath, output_filepath, quality=QUALITY_DEFAULT, arguments=None):
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im = Image.open(input_filepath)
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outfile, format = output_filepath.split(u':')
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im.save(outfile, format)
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'''
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command = []
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command.append(unicode(GM_PATH))
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command.append(u'convert')
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command.extend(unicode(QUALITY_SETTINGS[quality]).split())
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command.extend(unicode(GM_SETTINGS).split())
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command.append(unicode(input_filepath))
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if arguments:
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command.extend(unicode(arguments).split())
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command.append(unicode(output_filepath))
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proc = subprocess.Popen(command, close_fds=True, stderr=subprocess.PIPE, stdout=subprocess.PIPE)
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return_code = proc.wait()
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if return_code != 0:
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#Got an error from convert program
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error_line = proc.stderr.readline()
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if (CONVERTER_ERROR_STRING_NO_DECODER in error_line) or (CONVERTER_ERROR_STARTS_WITH in error_line):
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#Try to determine from error message which class of error is it
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raise UnknownFormat
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else:
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raise ConvertError(error_line)
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'''
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def get_format_list(self):
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"""
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Introspect PIL's internal registry to obtain a list of the
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supported file types
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"""
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formats = []
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for format_name in Image.ID:
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formats.append((format_name, u''))
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return formats
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def get_available_transformations(self):
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return [
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TRANSFORMATION_RESIZE, TRANSFORMATION_ROTATE
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]
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def get_page_count(self, input_filepath):
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try:
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return len(self.identify_file(unicode(input_filepath)).splitlines())
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except:
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#TODO: send to other page number identifying program
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return 1
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