libvips/python/vipsimage.py

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#!/usr/bin/python
"""This module wraps up libvips in a less awful interface.
Author: J.Cupitt
GNU LESSER GENERAL PUBLIC LICENSE
"""
import logging
import ctypes
import vipsobject
# image enums
class VipsDemandStyle:
SMALLTILE = 0
FATSTRIP = 1
THINSTRIP = 2
ANY = 3
# turn 3 into 'ANY', handy for printing
# is there a clever way to define this in a base Enum class? I can't think
# of it
@staticmethod
def name(value):
return vipsobject.class_value(VipsDemandStyle, value)
class VipsInterpretation:
MULTIBAND = 0
B_W = 1
HISTOGRAM = 10
FOURIER = 24
XYZ = 12
LAB = 13
CMYK = 15
LABQ = 16
RGB = 17
UCS = 18
LCH = 19
LABS = 21
sRGB = 22
YXY = 23
RGB16 = 25
GREY16 = 26
@staticmethod
def name(value):
print currentclass
return vipsobject.class_value(VipsInterpretation, value)
class VipsBandFormat:
NOTSET = -1
UCHAR = 0
CHAR = 1
USHORT = 2
SHORT = 3
UINT = 4
INT = 5
FLOAT = 6
COMPLEX = 7
DOUBLE = 8,
DPCOMPLEX = 9
LAST = 10
@staticmethod
def name(value):
return vipsobject.class_value(VipsBandFormat, value)
class VipsCoding:
NONE = 0
LABQ = 2
RAD = 6
@staticmethod
def name(value):
return vipsobject.class_value(VipsCoding, value)
libvips = vipsobject.libvips
vips_image_new = libvips.vips_image_new
vips_image_new.restype = ctypes.c_void_p
vips_image_new.errcheck = vipsobject.check_pointer_return
vips_image_new_from_file = libvips.vips_image_new_from_file
vips_image_new_from_file.argtypes = [ctypes.c_char_p]
vips_image_new_from_file.restype = ctypes.c_void_p
vips_image_new_from_file.errcheck = vipsobject.check_pointer_return
vips_image_new_mode = libvips.vips_image_new_mode
vips_image_new_mode.argtypes = [ctypes.c_char_p, ctypes.c_char_p]
vips_image_new_mode.restype = ctypes.c_void_p
vips_image_new_mode.errcheck = vipsobject.check_pointer_return
vips_image_write = libvips.vips_image_write
vips_image_write.argtypes = [ctypes.c_void_p, ctypes.c_char_p]
vips_image_write.restype = ctypes.c_void_p
vips_image_write.errcheck = vipsobject.check_int_return
vips_image_get_xres = libvips.vips_image_get_xres
vips_image_get_xres.restype = ctypes.c_double;
vips_image_get_yres = libvips.vips_image_get_yres
vips_image_get_yres.restype = ctypes.c_double;
vips_operation_new = libvips.vips_operation_new
vips_operation_new.argtypes = [ctypes.c_char_p]
vips_operation_new.restype = ctypes.c_void_p
vips_operation_new.errcheck = vipsobject.check_pointer_return
def vips_call_instance(self, name, args):
logging.debug('vipsimage: vips_call_instance name=%s, self=%s, args=%s' %
(name, self, args))
operation = vips_operation_new(name)
class VipsImage(vipsobject.VipsObject):
"""Manipulate a libvips image."""
def __init__(self, filename = None, mode = None):
logging.debug('vipsimage: init')
vipsobject.VipsObject.__init__(self)
if filename == None and mode == None:
self.vipsobject = vips_image_new()
elif filename != None and mode == None:
self.vipsobject = vips_image_new_from_file(filename)
else:
self.vipsobject = vips_image_new_mode(filename, mode)
logging.debug('vipsimage: made %s' % hex(self.vipsobject))
self.enable_finalize()
def __getattr__(self, name):
logging.debug('vipsimage: __getattr__ %s' % name)
return lambda *args: vips_call_instance(self, name, args)
def width(self):
return libvips.vips_image_get_width(self.vipsobject)
def height(self):
return libvips.vips_image_get_height(self.vipsobject)
def bands(self):
return libvips.vips_image_get_bands(self.vipsobject)
def format(self):
return libvips.vips_image_get_format(self.vipsobject)
def coding(self):
return libvips.vips_image_get_coding(self.vipsobject)
def interpretation(self):
return libvips.vips_image_get_interpretation(self.vipsobject)
def xres(self):
return vips_image_get_xres(self.vipsobject)
def yres(self):
return vips_image_get_yres(self.vipsobject)
def xoffset(self):
return libvips.vips_image_get_xoffset(self.vipsobject)
def yoffset(self):
return libvips.vips_image_get_yoffset(self.vipsobject)
def write(self, filename):
vips_image_write(self.vipsobject, filename)