mirror of
https://github.com/kovidgoyal/calibre.git
synced 2026-02-20 02:00:05 -05:00
55 lines
1.7 KiB
Python
55 lines
1.7 KiB
Python
__license__ = 'GPL v3'
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__copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
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import ctypes, os, sys
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from libprs500 import iswindows, isosx
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class WandException(Exception):
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pass
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_lib_name = 'CORE_RL_wand_.dll' if iswindows else 'libWand.dylib' if isosx else 'libWand.so'
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if iswindows and hasattr(sys, 'frozen'):
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im_dir = os.path.join(os.path.dirname(sys.executable), 'ImageMagick')
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os.putenv('PATH', im_dir + ';' + os.environ['PATH'])
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_libwand = None
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try:
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_libwand = ctypes.cdll.LoadLibrary(_lib_name)
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except:
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pass
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class Severity(ctypes.c_long):
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pass
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class String(ctypes.c_char_p):
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def __del__(self):
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_libwand.MagickRelinquishMemory(self)
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def __str__(self):
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return self.value
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if _libwand is not None:
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_libwand.MagickGetException.argtypes = [ctypes.c_void_p, ctypes.POINTER(Severity)]
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_libwand.MagickGetException.restype = String
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def get_exception(wand):
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severity = Severity()
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desc = _libwand.MagickGetException(wand, ctypes.byref(severity))
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return str(desc)
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def convert(source, dest):
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if _libwand is None:
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raise WandException('Could not find ImageMagick library')
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if not _libwand.MagickWandGenesis():
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raise WandException('Unable to initialize Image Magick')
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wand = _libwand.NewMagickWand()
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if wand <= 0:
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raise WandException('Unable to initialize Image Magick. Cannot create wand.')
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if not _libwand.MagickReadImage(wand, source):
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raise WandException('Cannot read image %s: %s'%(source, get_exception(wand)))
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if not _libwand.MagickWriteImage(wand, dest):
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raise WandException('Cannot write image to file %s: %s'%(source, get_exception(wand)))
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_libwand.DestroyMagickWand(wand)
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_libwand.MagickWandTerminus() |