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5d912fdbbb
libvips/python/Vips.py
John Cupitt 5d912fdbbb add [] overload to python 
index and slice image bands
2015-02-28 16:53:06 +00:00

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# -*- Mode: Python; py-indent-offset: 4 -*-
# vim: tabstop=4 shiftwidth=4 expandtab
from __future__ import division
# overrides for pygobject gobject-introspection binding for libvips, tested
# with python2.7 and python3.4
# copy this file to dist-packages/gi/overrides, eg.
#
# sudo cp Vips.py /usr/lib/python2.7/dist-packages/gi/overrides
# sudo cp Vips.py /usr/lib/python3/dist-packages/gi/overrides
#
# Alternatively, build vips to another prefix, then copy Vips.py and Vips.pyc
# from $prefix/lib/python2.7/dist-packages/gi/overrides to /usr
# This file is part of VIPS.
#
# VIPS is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
# more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
import sys
import re
import logging
from gi.repository import GObject
from ..overrides import override
from ..module import get_introspection_module
Vips = get_introspection_module('Vips')
__all__ = []
# start up vips!
# passing argv[0] helps vips find its data files on some platforms
Vips.init(sys.argv[0])
# need the gtypes for various vips types
vips_type_array_int = GObject.GType.from_name("VipsArrayInt")
vips_type_array_double = GObject.GType.from_name("VipsArrayDouble")
vips_type_array_image = GObject.GType.from_name("VipsArrayImage")
vips_type_blob = GObject.GType.from_name("VipsBlob")
vips_type_image = GObject.GType.from_name("VipsImage")
vips_type_operation = GObject.GType.from_name("VipsOperation")
def is_2D(value):
if not isinstance(value, list):
return False
for x in value:
if not isinstance(x, list):
return False
if len(x) != len(value[0]):
return False
return True
def imageize(match_image, value):
logging.debug('imageize match_image=%s, value=%s' % (match_image, value))
# 2D arrays become array images
if is_2D(value):
return Vips.Image.new_from_array(value)
# if there's nothing to match to, also make an array
if match_image is None:
return Vips.Image.new_from_array(value)
# assume this is a pixel constant ... expand into an image using
# match as a template
pixel = (Vips.Image.black(1, 1) + value).cast(match_image.format)
image = pixel.embed(0, 0, match_image.width, match_image.height,
extend = Vips.Extend.COPY)
image = image.copy(interpretation = match_image.interpretation,
xres = match_image.xres,
yres = match_image.yres)
return image
# we'd like to use memoryview to avoid copying things like ICC profiles, but
# unfortunately pygobject does not support this ... so for blobs we just use
# bytes().
unpack_types = [[Vips.Blob, lambda x: bytes(x.get())],
[Vips.ArrayDouble, lambda x: x.get()],
[Vips.ArrayImage, lambda x: x.get()],
[Vips.ArrayInt, lambda x: x.get()]]
def unpack(value):
for t, cast in unpack_types:
if isinstance(value, t):
return cast(value)
return value
def array_image_new(array):
match_image = None
for i in range(0, len(array)):
if isinstance(array[i], Vips.Image):
match_image = array[i]
break
if match_image is None:
raise Error('Unable to make image array argument.',
'Array must contain at least one image.')
for i in range(0, len(array)):
if not isinstance(array[i], Vips.Image):
array[i] = imageize(match_image, array[i])
return Vips.ArrayImage.new(array)
arrayize_types = [[vips_type_array_int, Vips.ArrayInt.new],
[vips_type_array_double, Vips.ArrayDouble.new],
[vips_type_array_image, array_image_new]]
def arrayize(gtype, value):
for t, cast in arrayize_types:
if GObject.type_is_a(gtype, t):
if not isinstance(value, list):
value = [value]
return cast(value)
return value
class Error(Exception):
"""An error from vips.
message -- a high-level description of the error
detail -- a string with some detailed diagnostics
"""
def __init__(self, message, detail = None):
self.message = message
if detail == None:
detail = Vips.error_buffer()
Vips.error_clear()
self.detail = detail
logging.debug('Error %s %s', self.message, self.detail)
def __str__(self):
return '%s\n %s' % (self.message, self.detail)
Vips.Error = Error
class Argument(object):
def __init__(self, op, prop):
self.op = op
self.prop = prop
self.name = re.sub("-", "_", prop.name)
self.flags = op.get_argument_flags(self.name)
self.priority = op.get_argument_priority(self.name)
self.isset = op.argument_isset(self.name)
def set_value(self, match_image, value):
logging.debug('assigning %s to %s' % (value, self.name))
logging.debug('%s needs a %s' % (self.name, self.prop.value_type))
# blob-ize
if GObject.type_is_a(self.prop.value_type, vips_type_blob):
if not isinstance(value, Vips.Blob):
value = Vips.Blob.new(None, value)
# image-ize
if GObject.type_is_a(self.prop.value_type, vips_type_image):
if not isinstance(value, Vips.Image):
value = imageize(match_image, value)
# array-ize some types, if necessary
value = arrayize(self.prop.value_type, value)
# MODIFY input images need to be copied before assigning them
if self.flags & Vips.ArgumentFlags.MODIFY:
# don't use .copy(): we want to make a new pipeline with no
# reference back to the old stuff ... this way we can free the
# previous image earlier
new_image = Vips.Image.new_memory()
value.write(new_image)
value = new_image
logging.debug('assigning %s' % self.prop.value_type)
self.op.props.__setattr__(self.name, value)
def get_value(self):
value = self.op.props.__getattribute__(self.name)
logging.debug('read out %s from %s' % (value, self.name))
return unpack(value)
def description(self):
result = self.name
result += " " * (10 - len(self.name)) + " -- " + self.prop.blurb
result += ", " + self.prop.value_type.name
return result
Vips.Argument = Argument
class Operation(Vips.Operation):
# find all the args for this op, sort into priority order
# remember to ignore deprecated ones
def get_args(self):
args = [Argument(self, x) for x in self.props]
args = [y for y in args
if not y.flags & Vips.ArgumentFlags.DEPRECATED]
args.sort(key = lambda x: x.priority)
return args
Operation = override(Operation)
__all__.append('Operation')
# search a list recursively for a Vips.Image object
def find_image(x):
if isinstance(x, Vips.Image):
return x
if isinstance(x, list):
for i in x:
y = find_image(i)
if y is not None:
return y
return None
def _call_base(name, required, optional, self = None, option_string = None):
logging.debug('_call_base name=%s, required=%s optional=%s' %
(name, required, optional))
if self:
logging.debug('_call_base self=%s' % self)
if option_string:
logging.debug('_call_base option_string = %s' % option_string)
try:
op = Vips.Operation.new(name)
except TypeError as e:
raise Error('No such operator.')
if op.get_flags() & Vips.OperationFlags.DEPRECATED:
raise Error('No such operator.', 'operator "%s" is deprecated' % name)
# set str options first so the user can't override things we set
# deliberately and break stuff
if option_string:
if op.set_from_string(option_string) != 0:
raise Error('Bad arguments.')
args = op.get_args()
enm = Vips.ArgumentFlags
# find all required, unassigned input args
required_input = [x for x in args if x.flags & enm.INPUT and
x.flags & enm.REQUIRED and
not x.isset]
# do we have a non-None self pointer? this is used to set the first
# compatible input arg
if self is not None:
found = False
for x in required_input:
if GObject.type_is_a(self, x.prop.value_type):
x.set_value(None, self)
required_input.remove(x)
found = True
break
if not found:
raise Error('Bad arguments.', 'No %s argument to %s.' %
(str(self.__class__), name))
if len(required_input) != len(required):
raise Error('Wrong number of arguments.',
'%s needs %d arguments, you supplied %d.' %
(name, len(required_input), len(required)))
# if we need an image arg but the user supplied a number or list of
# numbers, we expand it into an image automatically ... the number is
# expanded to match self, or if that's None, the first image we can find in
# the required or optional arguments
match_image = self
if match_image is None:
for arg in required:
match_image = find_image(arg)
if match_image is not None:
break
if match_image is None:
for arg_name in optional:
match_image = find_image(optional[arg_name])
if match_image is not None:
break
for i in range(len(required_input)):
required_input[i].set_value(match_image, required[i])
# find all optional, unassigned input args ... make a hash from name to
# Argument
optional_input = {x.name: x for x in args if x.flags & enm.INPUT and
not x.flags & enm.REQUIRED and
not x.isset}
# find all optional output args ... we use "x = True"
# in args to mean add that to output
optional_output = {x.name: x for x in args if x.flags & enm.OUTPUT and
not x.flags & enm.REQUIRED}
# set optional input args
for key in list(optional.keys()):
if key in optional_input:
optional_input[key].set_value(match_image, optional[key])
elif key in optional_output:
# must be a literal True value
if optional[key] is not True:
raise Error('Optional output argument must be True.',
'Argument %s should equal True.' % key)
else:
raise Error('Unknown argument.',
'Operator %s has no argument %s.' % (name, key))
# call
logging.debug('_call_base checking cache for op %s' % op)
op2 = Vips.cache_operation_build(op)
logging.debug('_call_base got op2 %s' % op2)
if op2 == None:
raise Error('Error calling operator %s.' % name)
# rescan args if op2 is different from op
if op2 != op:
logging.debug('_call_base rescanning args')
args = op2.get_args()
optional_output = {x.name: x for x in args if x.flags & enm.OUTPUT and
not x.flags & enm.REQUIRED}
# gather output args
logging.debug('_call_base fetching required output args')
out = []
for x in args:
# required output arg
if x.flags & enm.OUTPUT and x.flags & enm.REQUIRED:
out.append(x.get_value())
# modified input arg ... this will get the result of the copy() we
# did above
if x.flags & enm.INPUT and x.flags & enm.MODIFY:
out.append(x.get_value())
logging.debug('_call_base fetching optional output args')
out_dict = {}
for x in list(optional.keys()):
if x in optional_output:
out_dict[x] = optional_output[x].get_value()
if out_dict != {}:
out.append(out_dict)
if len(out) == 1:
out = out[0]
elif len(out) == 0:
out = None
# unref everything now we have refs to all outputs we want
op2.unref_outputs()
logging.debug('success')
return out
# general user entrypoint
def call(name, *args, **kwargs):
return _call_base(name, args, kwargs)
Vips.call = call
# here from getattr ... try to run the attr as a method
def _call_instance(self, name, args, kwargs):
return _call_base(name, args, kwargs, self)
@classmethod
def vips_image_new_from_file(cls, vips_filename, **kwargs):
"""Create a new Image from a filename.
Extra optional arguments depend on the loader selected by libvips. See each
loader for details.
"""
filename = Vips.filename_get_filename(vips_filename)
option_string = Vips.filename_get_options(vips_filename)
loader = Vips.Foreign.find_load(filename)
if loader == None:
raise Error('No known loader for "%s".' % filename)
logging.debug('Image.new_from_file: loader = %s' % loader)
return _call_base(loader, [filename], kwargs, None, option_string)
setattr(Vips.Image, 'new_from_file', vips_image_new_from_file)
@classmethod
def vips_image_new_from_buffer(cls, data, option_string, **kwargs):
"""Create a new Image from binary data in a string.
data -- binary image data
option_string -- optional arguments in string form
option_string can be something like "page=10" to load the 10th page of a
tiff file. You can also give load options as keyword arguments.
"""
loader = Vips.Foreign.find_load_buffer(data)
if loader == None:
raise Error('No known loader for buffer.')
logging.debug('Image.new_from_buffer: loader = %s' % loader)
return _call_base(loader, [data], kwargs, None, option_string)
setattr(Vips.Image, 'new_from_buffer', vips_image_new_from_buffer)
@classmethod
def vips_image_new_from_array(cls, array, scale = 1, offset = 0):
"""Create a new image from an array.
The array argument can be a 1D array to create a height == 1 image, or a 2D
array to make a 2D image. Use scale and offset to set the scale factor,
handy for integer convolutions.
"""
# we accept a 1D array and assume height == 1, or a 2D array and check all
# lines are the same length
if not isinstance(array, list):
raise TypeError('new_from_array() takes a list argument')
if not isinstance(array[0], list):
height = 1
width = len(array)
else:
flat_array = array[0]
height = len(array)
width = len(array[0])
for i in range(1, height):
if len(array[i]) != width:
raise TypeError('new_from_array() array not rectangular')
flat_array += array[i]
array = flat_array
image = cls.new_matrix_from_array(width, height, array)
# be careful to set them as double
image.set('scale', float(scale))
image.set('offset', float(offset))
return image
setattr(Vips.Image, 'new_from_array', vips_image_new_from_array)
def generate_docstring(name):
try:
op = Vips.Operation.new(name)
except TypeError as e:
raise Error('No such operator.')
if op.get_flags() & Vips.OperationFlags.DEPRECATED:
raise Error('No such operator.', 'operator "%s" is deprecated' % name)
# find all the args for this op, sort into priority order
args = op.get_args()
enm = Vips.ArgumentFlags
# find all required, unassigned input args
required_input = [x for x in args if x.flags & enm.INPUT and
x.flags & enm.REQUIRED and
not x.isset]
optional_input = [x for x in args if x.flags & enm.INPUT and
not x.flags & enm.REQUIRED and
not x.isset]
required_output = [x for x in args if x.flags & enm.OUTPUT and
x.flags & enm.REQUIRED]
optional_output = [x for x in args if x.flags & enm.OUTPUT and
not x.flags & enm.REQUIRED]
# find the first required input image, if any ... we will be a member
# function of this instance
member_x = None
for i in range(0, len(required_input)):
x = required_input[i]
if GObject.type_is_a(vips_type_image, x.prop.value_type):
member_x = x
break
description = op.get_description()
result = description[0].upper() + description[1:] + ".\n\n"
result += "Usage:\n"
result += " " + ", ".join([x.name for x in required_output]) + " = "
if member_x:
result += member_x.name + "." + name + "("
else:
result += "Vips.Image." + name + "("
result += ", ".join([x.name for x in required_input
if x != member_x])
if len(optional_input) > 0:
result += ", "
result += ", ".join([x.name + " = " + x.prop.value_type.name
for x in optional_input])
result += ")\n"
result += "Where:\n"
for x in required_output:
result += " " + x.description() + "\n"
for x in required_input:
result += " " + x.description() + "\n"
if len(optional_input) > 0:
result += "Keyword parameters:\n"
for x in optional_input:
result += " " + x.description() + "\n"
if len(optional_output) > 0:
result += "Extra output options:\n"
for x in optional_output:
result += " " + x.description() + "\n"
return result
# apply a function to a thing, or map over a list
# we often need to do something like (1.0 / other) and need to work for lists
# as well as scalars
def smap(func, x):
if isinstance(x, list):
return list(map(func, x))
else:
return func(x)
# decorator to set docstring
def add_doc(value):
def _doc(func):
func.__doc__ = value
return func
return _doc
class Image(Vips.Image):
# for constructors, see class methods above
# output
def write_to_file(self, vips_filename, **kwargs):
"""Write an Image to a file.
The filename can contain save options, for example
"fred.tif[compression=jpeg]", or save options can be given as keyword
arguments. Save options depend on the selected saver.
"""
filename = Vips.filename_get_filename(vips_filename)
option_string = Vips.filename_get_options(vips_filename)
saver = Vips.Foreign.find_save(filename)
if saver == None:
raise Error('No known saver for "%s".' % filename)
logging.debug('Image.write_to_file: saver = %s' % saver)
_call_base(saver, [filename], kwargs, self, option_string)
def write_to_buffer(self, format_string, **kwargs):
"""Write an Image to memory.
Return the image as a binary string, encoded in the selected format.
Save options can be given in the format_string, for example
".jpg[Q=90]". Save options depend on the selected saver.
"""
filename = Vips.filename_get_filename(format_string)
option_string = Vips.filename_get_options(format_string)
saver = Vips.Foreign.find_save_buffer(filename)
if saver == None:
raise Error('No known saver for "%s".' % filename)
logging.debug('Image.write_to_buffer: saver = %s' % saver)
return _call_base(saver, [], kwargs, self, option_string)
# we can use Vips.Image.write_to_memory() directly
# operator overloads
def __getattr__(self, name):
logging.debug('Image.__getattr__ %s' % name)
# look up in props first, eg. x.props.width
if name in dir(self.props):
return getattr(self.props, name)
@add_doc(generate_docstring(name))
def call_function(*args, **kwargs):
return _call_instance(self, name, args, kwargs)
return call_function
def __add__(self, other):
if isinstance(other, Vips.Image):
return self.add(other)
else:
return self.linear(1, other)
def __radd__(self, other):
return self.__add__(other)
def __sub__(self, other):
if isinstance(other, Vips.Image):
return self.subtract(other)
else:
return self.linear(1, smap(lambda x: -1 * x, other))
def __rsub__(self, other):
return self.linear(-1, other)
def __mul__(self, other):
if isinstance(other, Vips.Image):
return self.multiply(other)
else:
return self.linear(other, 0)
def __rmul__(self, other):
return self.__mul__(other)
# a / const has always been a float in vips, so div and truediv are the
# same
def __div__(self, other):
if isinstance(other, Vips.Image):
return self.divide(other)
else:
return self.linear(smap(lambda x: 1.0 / x, other), 0)
def __rdiv__(self, other):
return (self ** -1) * other
def __truediv__(self, other):
return self.__div__(other)
def __rtruediv__(self, other):
return self.__rdiv__(other)
def __floordiv__(self, other):
if isinstance(other, Vips.Image):
return self.divide(other).floor()
else:
return self.linear(smap(lambda x: 1.0 / x, other), 0).floor()
def __rfloordiv__(self, other):
return ((self ** -1) * other).floor()
def __mod__(self, other):
if isinstance(other, Vips.Image):
return self.remainder(other)
else:
return self.remainder_const(other)
def __pow__(self, other):
if isinstance(other, Vips.Image):
return self.math2(other, Vips.OperationMath2.POW)
else:
return self.math2_const(other, Vips.OperationMath2.POW)
def __rpow__(self, other):
return self.math2_const(other, Vips.OperationMath2.WOP)
def __abs__(self):
return self.abs()
def __lshift__(self, other):
if isinstance(other, Vips.Image):
return self.boolean(other, Vips.OperationBoolean.LSHIFT)
else:
return self.boolean_const(other, Vips.OperationBoolean.LSHIFT)
def __rshift__(self, other):
if isinstance(other, Vips.Image):
return self.boolean(other, Vips.OperationBoolean.RSHIFT)
else:
return self.boolean_const(other, Vips.OperationBoolean.RSHIFT)
def __and__(self, other):
if isinstance(other, Vips.Image):
return self.boolean(other, Vips.OperationBoolean.AND)
else:
return self.boolean_const(other, Vips.OperationBoolean.AND)
def __rand__(self, other):
return self.__and__(other)
def __or__(self, other):
if isinstance(other, Vips.Image):
return self.boolean(other, Vips.OperationBoolean.OR)
else:
return self.boolean_const(other, Vips.OperationBoolean.OR)
def __ror__(self, other):
return self.__or__(other)
def __xor__(self, other):
if isinstance(other, Vips.Image):
return self.boolean(other, Vips.OperationBoolean.EOR)
else:
return self.boolean_const(other, Vips.OperationBoolean.EOR)
def __rxor__(self, other):
return self.__xor__(other)
def __neg__(self):
return -1 * self
def __pos__(self):
return self
def __invert__(self):
return self ^ -1
def __gt__(self, other):
if isinstance(other, Vips.Image):
return self.relational(other, Vips.OperationRelational.MORE)
else:
return self.relational_const(other, Vips.OperationRelational.MORE)
def __ge__(self, other):
if isinstance(other, Vips.Image):
return self.relational(other, Vips.OperationRelational.MOREEQ)
else:
return self.relational_const(other, Vips.OperationRelational.MOREEQ)
def __lt__(self, other):
if isinstance(other, Vips.Image):
return self.relational(other, Vips.OperationRelational.LESS)
else:
return self.relational_const(other, Vips.OperationRelational.LESS)
def __le__(self, other):
if isinstance(other, Vips.Image):
return self.relational(other, Vips.OperationRelational.LESSEQ)
else:
return self.relational_const(other, Vips.OperationRelational.LESSEQ)
def __eq__(self, other):
if isinstance(other, Vips.Image):
return self.relational(other, Vips.OperationRelational.EQUAL)
else:
return self.relational_const(other, Vips.OperationRelational.EQUAL)
def __ne__(self, other):
if isinstance(other, Vips.Image):
return self.relational(other, Vips.OperationRelational.NOTEQ)
else:
return self.relational_const(other, Vips.OperationRelational.NOTEQ)
def __getitem__(self, arg):
if isinstance(arg, slice):
i = 0
if arg.start != None:
i = arg.start
n = self.bands - i
if arg.stop != None:
if arg.stop < 0:
n = self.bands + arg.stop - i
else:
n = arg.stop - i
elif isinstance(arg, int):
i = arg
n = 1
else:
raise TypeError
if i < 0:
i = self.bands + i
if i < 0 or i >= self.bands:
raise IndexError
return self.extract_band(i, n = n)
# the cast operators int(), long() and float() must return numeric types,
# so we can't define them for images
# a few useful things
def get_value(self, field):
"""Get a named item from an Image.
Fetch an item of metadata and convert it to a Python-friendly format.
For example, VipsBlob values will be converted to bytes().
"""
value = self.get(field)
logging.debug('read out %s from %s' % (value, self))
return unpack(value)
def set_value(self, field, value):
"""Set a named item on an Image.
Values are converted from Python types to something libvips can swallow.
For example, bytes() can be used to set VipsBlob fields.
"""
gtype = self.get_typeof(field)
logging.debug('assigning %s to %s' % (value, self))
logging.debug('%s needs a %s' % (self, gtype))
# blob-ize
if GObject.type_is_a(gtype, vips_type_blob):
if not isinstance(value, Vips.Blob):
value = Vips.Blob.new(None, value)
# image-ize
if GObject.type_is_a(gtype, vips_type_image):
if not isinstance(value, Vips.Image):
value = imageize(self, value)
# array-ize some types, if necessary
value = arrayize(gtype, value)
self.set(field, value)
def floor(self):
"""Return the largest integral value not greater than the argument."""
return self.round(Vips.OperationRound.FLOOR)
def ceil(self):
"""Return the smallest integral value not less than the argument."""
return self.round(Vips.OperationRound.CEIL)
def rint(self):
"""Return the nearest integral value."""
return self.round(Vips.OperationRound.RINT)
def bandsplit(self):
"""Split an n-band image into n separate images."""
return [x for x in self]
def bandjoin(self, other):
"""Join a set of images bandwise."""
if not isinstance(other, list):
other = [other]
return Vips.Image.bandjoin([self] + other)
def maxpos(self):
"""Return the coordinates of the image maximum."""
v, opts = self.max(x = True, y = True)
x = opts['x']
y = opts['y']
return v, x, y
def minpos(self):
"""Return the coordinates of the image minimum."""
v, opts = self.min(x = True, y = True)
x = opts['x']
y = opts['y']
return v, x, y
def real(self):
"""Return the real part of a complex image."""
return self.complexget(Vips.OperationComplexget.REAL)
def imag(self):
"""Return the imaginary part of a complex image."""
return self.complexget(Vips.OperationComplexget.IMAG)
def polar(self):
"""Return an image converted to polar coordinates."""
return self.complex(Vips.OperationComplex.POLAR)
def rect(self):
"""Return an image converted to rectangular coordinates."""
return self.complex(Vips.OperationComplex.RECT)
def conj(self):
"""Return the complex conjugate of an image."""
return self.complex(Vips.OperationComplex.CONJ)
def sin(self):
"""Return the sine of an image in degrees."""
return self.math(Vips.OperationMath.SIN)
def cos(self):
"""Return the cosine of an image in degrees."""
return self.math(Vips.OperationMath.COS)
def tan(self):
"""Return the tangent of an image in degrees."""
return self.math(Vips.OperationMath.TAN)
def asin(self):
"""Return the inverse sine of an image in degrees."""
return self.math(Vips.OperationMath.ASIN)
def acos(self):
"""Return the inverse cosine of an image in degrees."""
return self.math(Vips.OperationMath.ACOS)
def atan(self):
"""Return the inverse tangent of an image in degrees."""
return self.math(Vips.OperationMath.ATAN)
def log(self):
"""Return the natural log of an image."""
return self.math(Vips.OperationMath.LOG)
def log10(self):
"""Return the log base 10 of an image."""
return self.math(Vips.OperationMath.LOG10)
def exp(self):
"""Return e ** pixel."""
return self.math(Vips.OperationMath.EXP)
def exp10(self):
"""Return 10 ** pixel."""
return self.math(Vips.OperationMath.EXP10)
def erode(self, mask):
"""Erode with a structuring element."""
return self.morph(mask, Vips.OperationMorphology.ERODE)
def dilate(self, mask):
"""Dilate with a structuring element."""
return self.morph(mask, Vips.OperationMorphology.DILATE)
def median(self, size):
"""size x size median filter."""
return self.rank(size, size, (size * size) / 2)
def fliphor(self):
"""Flip horizontally."""
return self.flip(Vips.Direction.HORIZONTAL)
def flipver(self):
"""Flip vertically."""
return self.flip(Vips.Direction.VERTICAL)
def rot90(self):
"""Rotate 90 degrees clockwise."""
return self.rot(Vips.Angle.D90)
def rot180(self):
"""Rotate 180 degrees."""
return self.rot(Vips.Angle.D180)
def rot270(self):
"""Rotate 270 degrees clockwise."""
return self.rot(Vips.Angle.D270)
# we need different imageize rules for this operator ... we need to
# imageize th and el to match each other first
@add_doc(generate_docstring("ifthenelse"))
def ifthenelse(self, th, el, **kwargs):
for match_image in [th, el, self]:
if isinstance(match_image, Vips.Image):
break
if not isinstance(th, Vips.Image):
th = imageize(match_image, th)
if not isinstance(el, Vips.Image):
el = imageize(match_image, el)
return _call_base("ifthenelse", [th, el], kwargs, self)
# add operators which needs to be class methods
# use find_class_methods.py to generate this list
class_methods = [
"system",
"sum",
"bandjoin",
"bandrank",
"black",
"gaussnoise",
"text",
"xyz",
"gaussmat",
"logmat",
"eye",
"grey",
"zone",
"sines",
"mask_ideal",
"mask_ideal_ring",
"mask_ideal_band",
"mask_butterworth",
"mask_butterworth_ring",
"mask_butterworth_band",
"mask_gaussian",
"mask_gaussian_ring",
"mask_gaussian_band",
"mask_fractal",
"tonelut",
"identity",
"fractsurf",
"radload",
"ppmload",
"csvload",
"matrixload",
"analyzeload",
"rawload",
"vipsload",
"pngload",
"pngload_buffer",
"matload",
"jpegload",
"jpegload_buffer",
"webpload",
"webpload_buffer",
"tiffload",
"tiffload_buffer",
"openslideload",
"magickload",
"magickload_buffer",
"fitsload",
"openexrload"]
def generate_class_method(name):
@classmethod
@add_doc(generate_docstring(name))
def class_method(cls, *args, **kwargs):
return _call_base(name, args, kwargs)
return class_method
for nickname in class_methods:
logging.debug('adding %s as a class method' % nickname)
# some may be missing in this vips, eg. we might not have "webpload"
try:
method = generate_class_method(nickname)
setattr(Vips.Image, nickname, method)
except Error:
pass
Image = override(Image)
__all__.append('Image')
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