67 lines
1.5 KiB
Python
67 lines
1.5 KiB
Python
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#!/usr/bin/python
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"""This module wraps up libvips in a less awful interface.
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Wrap VipsObject.
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Author: J.Cupitt
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GNU LESSER GENERAL PUBLIC LICENSE
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"""
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import logging
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import sys
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import ctypes
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import finalize
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# .15 is 7.25+ with the new vips8 API
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libvips = ctypes.CDLL('libvips.so.15')
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libvips.vips_init(sys.argv[0])
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class Error(Exception):
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"""An error from libvips.
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message -- a high-level description of the error
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detail -- a string with some detailed diagnostics
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"""
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def __init__(self, message):
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self.message = message
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self.detail = vips_error_buffer()
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libvips.vips_error_clear()
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logging.debug('vipsobject: Error %s %s', self.message, self.detail)
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def __str__(self):
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return '%s - %s' %(self.message, self.detail)
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def check_int_return(value):
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if value != 0:
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raise Error('Error calling vips function.')
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return value
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def check_pointer_return(value):
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if value == None:
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raise Error('Error calling vips function.')
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return value
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vips_error_buffer = libvips.vips_error_buffer
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vips_error_buffer.restype = ctypes.c_char_p
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class VipsObject:
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"""Abstract base class for libvips."""
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def unref_vips(self):
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if self.vipsobject != None:
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libvips.g_object_unref(self.vipsobject)
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self.vipsobject = None
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def __init__(self):
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logging.debug('vipsobject: init')
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self.vipsobject = None
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finalize.track(self, self, self.unref_vips)
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