def get(self):
"""Get the contents of a GValue.
The contents of the GValue are read out as a Python type.
"""
# logger.debug('GValue.get: self = %s', self)
gtype = self.gvalue.g_type
fundamental = gobject_lib.g_type_fundamental(gtype)
result = None
if gtype == GValue.gbool_type:
result = bool(gobject_lib.g_value_get_boolean(self.gvalue))
elif gtype == GValue.gint_type:
result = gobject_lib.g_value_get_int(self.gvalue)
elif gtype == GValue.gdouble_type:
result = gobject_lib.g_value_get_double(self.gvalue)
elif fundamental == GValue.genum_type:
return GValue.from_enum(gtype,
gobject_lib.g_value_get_enum(self.gvalue))
elif fundamental == GValue.gflags_type:
result = gobject_lib.g_value_get_flags(self.gvalue)
elif gtype == GValue.gstr_type:
pointer = gobject_lib.g_value_get_string(self.gvalue)
if pointer != ffi.NULL:
result = _to_string(pointer)
elif gtype == GValue.refstr_type:
psize = ffi.new('size_t *')
pointer = vips_lib.vips_value_get_ref_string(self.gvalue, psize)
# psize[0] will be number of bytes in string, but just assume it's
# NULL-terminated
result = _to_string(pointer)
elif gtype == GValue.image_type:
# g_value_get_object() will not add a ref ... that is
# held by the gvalue
go = gobject_lib.g_value_get_object(self.gvalue)
vi = ffi.cast('VipsImage *', go)
# we want a ref that will last with the life of the vimage:
# this ref is matched by the unref that's attached to finalize
# by Image()
gobject_lib.g_object_ref(go)
result = pyvips.Image(vi)
elif gtype == GValue.array_int_type:
pint = ffi.new('int *')
array = vips_lib.vips_value_get_array_int(self.gvalue, pint)
result = []
for i in range(0, pint[0]):
result.append(array[i])
elif gtype == GValue.array_double_type:
pint = ffi.new('int *')
array = vips_lib.vips_value_get_array_double(self.gvalue, pint)
result = []
for i in range(0, pint[0]):
result.append(array[i])
elif gtype == GValue.array_image_type:
pint = ffi.new('int *')
array = vips_lib.vips_value_get_array_image(self.gvalue, pint)
result = []
for i in range(0, pint[0]):
vi = array[i]
gobject_lib.g_object_ref(vi)
image = pyvips.Image(vi)
result.append(image)
elif gtype == GValue.blob_type:
psize = ffi.new('size_t *')
array = vips_lib.vips_value_get_blob(self.gvalue, psize)
buf = ffi.cast('char*', array)
result = ffi.unpack(buf, psize[0])
else:
raise Error('unsupported gtype for get {0}'.format(
type_name(gtype)))
return result
def _marshal_image_progress(vi, pointer, handle):
gobject_lib.g_object_ref(vi)
image = pyvips.Image(vi)
callback = ffi.from_handle(handle)
progress = ffi.cast('VipsProgress*', pointer)
callback(image, progress)
def set(self, value):
"""Set a GValue.
The value is converted to the type of the GValue, if possible, and
assigned.
"""
# logger.debug('GValue.set: value = %s', value)
gtype = self.gvalue.g_type
fundamental = gobject_lib.g_type_fundamental(gtype)
if gtype == GValue.gbool_type:
gobject_lib.g_value_set_boolean(self.gvalue, value)
elif gtype == GValue.gint_type:
gobject_lib.g_value_set_int(self.gvalue, int(value))
elif gtype == GValue.gdouble_type:
gobject_lib.g_value_set_double(self.gvalue, value)
elif fundamental == GValue.genum_type:
gobject_lib.g_value_set_enum(self.gvalue,
GValue.to_enum(gtype, value))
elif fundamental == GValue.gflags_type:
gobject_lib.g_value_set_flags(self.gvalue, value)
elif gtype == GValue.gstr_type:
gobject_lib.g_value_set_string(self.gvalue, _to_bytes(value))
elif gtype == GValue.refstr_type:
vips_lib.vips_value_set_ref_string(self.gvalue, _to_bytes(value))
elif fundamental == GValue.gobject_type:
gobject_lib.g_value_set_object(self.gvalue, value.pointer)
elif gtype == GValue.array_int_type:
if isinstance(value, numbers.Number):
value = [value]
array = ffi.new('int[]', value)
vips_lib.vips_value_set_array_int(self.gvalue, array, len(value))
elif gtype == GValue.array_double_type:
if isinstance(value, numbers.Number):
value = [value]
array = ffi.new('double[]', value)
vips_lib.vips_value_set_array_double(self.gvalue, array,
len(value))
elif gtype == GValue.array_image_type:
if isinstance(value, pyvips.Image):
value = [value]
vips_lib.vips_value_set_array_image(self.gvalue, len(value))
array = vips_lib.vips_value_get_array_image(self.gvalue, ffi.NULL)
for i, image in enumerate(value):
gobject_lib.g_object_ref(image.pointer)
array[i] = image.pointer
elif gtype == GValue.blob_type:
# we need to set the blob to a copy of the string that vips_lib
# can own
memory = glib_lib.g_malloc(len(value))
ffi.memmove(memory, value, len(value))
# this is horrible!
#
# * in API mode, we must have 8.6+ and use set_blob_free to
# attach the metadata to avoid leaks
# * pre-8.6, we just pass a NULL free pointer and live with the
# leak
#
# this is because in API mode you can't pass a builtin (what
# vips_lib.g_free() becomes) as a parameter to ffi.callback(), and
# vips_value_set_blob() needs a callback for arg 2
#
# additionally, you can't make a py def which calls g_free() and
# then use the py def in the callback, since libvips will trigger
# these functions during cleanup, and py will have shut down by
# then and you'll get a segv
if at_least_libvips(8, 6):
vips_lib.vips_value_set_blob_free(self.gvalue, memory,
len(value))
else:
if pyvips.API_mode:
vips_lib.vips_value_set_blob(self.gvalue, ffi.NULL, memory,
len(value))
else:
vips_lib.vips_value_set_blob(self.gvalue, glib_lib.g_free,
memory, len(value))
else:
raise Error(
'unsupported gtype for set {0}, fundamental {1}'.format(
type_name(gtype), type_name(fundamental)))
def set(self, value):
"""Set a GValue.
The value is converted to the type of the GValue, if possible, and
assigned.
"""
# logger.debug('GValue.set: value = %s', value)
gtype = self.gvalue.gtype
fundamental = gobject_lib.g_type_fundamental(gtype)
if gtype == GValue.gbool_type:
gobject_lib.g_value_set_boolean(self.gvalue, value)
elif gtype == GValue.gint_type:
gobject_lib.g_value_set_int(self.gvalue, int(value))
elif gtype == GValue.gdouble_type:
gobject_lib.g_value_set_double(self.gvalue, value)
elif fundamental == GValue.genum_type:
gobject_lib.g_value_set_enum(self.gvalue,
GValue.to_enum(gtype, value))
elif fundamental == GValue.gflags_type:
gobject_lib.g_value_set_flags(self.gvalue, value)
elif gtype == GValue.gstr_type or gtype == GValue.refstr_type:
gobject_lib.g_value_set_string(self.gvalue, _to_bytes(value))
elif fundamental == GValue.gobject_type:
gobject_lib.g_value_set_object(self.gvalue, value.pointer)
elif gtype == GValue.array_int_type:
if isinstance(value, numbers.Number):
value = [value]
array = ffi.new('int[]', value)
vips_lib.vips_value_set_array_int(self.gvalue, array, len(value))
elif gtype == GValue.array_double_type:
if isinstance(value, numbers.Number):
value = [value]
array = ffi.new('double[]', value)
vips_lib.vips_value_set_array_double(self.gvalue, array,
len(value))
elif gtype == GValue.array_image_type:
if isinstance(value, pyvips.Image):
value = [value]
vips_lib.vips_value_set_array_image(self.gvalue, len(value))
array = vips_lib.vips_value_get_array_image(self.gvalue, ffi.NULL)
for i, image in enumerate(value):
gobject_lib.g_object_ref(image.pointer)
array[i] = image.pointer
elif gtype == GValue.blob_type:
# we need to set the blob to a copy of the string that vips_lib
# can own
memory = glib_lib.g_malloc(len(value))
ffi.memmove(memory, value, len(value))
vips_lib.vips_value_set_blob(self.gvalue, glib_lib.g_free, memory,
len(value))
else:
raise Error(
'unsupported gtype for set {0}, fundamental {1}'.format(
type_name(gtype), type_name(fundamental)))
