Class: GObject::GValue

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# File 'lib/vips/gvalue.rb', line 63
def self.alloc
 # allocate memory
 memory = FFI::MemoryPointer.new GValue 
 # make this alloc autorelease ... we mustn't release in
 # GValue::release, since we are used to wrap GValue pointers
 # made by other people
 pointer = FFI::Pointer.new GValue , memory
 # ... and wrap in a GValue
 GValue .new pointer
end

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# File 'lib/vips/gvalue.rb', line 28
def self.from_nick(gtype, value)
 value = value.to_s if value.is_a? Symbol
 if value.is_a? String
 # libvips expects "-" as a separator in enum names, but "_" is more
 # convenient for ruby, eg. :b_w
 value = Vips .vips_enum_from_nick "ruby-vips", gtype, value.tr("_", "-")
 if value == -1
 raise Vips ::Error 
 end
 end
 value
end

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# File 'lib/vips/gvalue.rb', line 53
def self.release ptr
 # GLib::logger.debug("GObject::GValue::release") {"ptr = #{ptr}"}
 ::GObject .g_value_unset ptr
end

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# File 'lib/vips/gvalue.rb', line 44
def self.to_nick(gtype, enum_value)
 enum_name = Vips .vips_enum_nick gtype, enum_value
 if enum_name.nil?
 raise Vips ::Error 
 end
 enum_name.to_sym
end

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# File 'lib/vips/gvalue.rb', line 171
def get
 gtype = self[:gtype]
 fundamental = ::GObject .g_type_fundamental gtype
 result = nil
 case gtype
 when GBOOL_TYPE 
 result = ::GObject .g_value_get_boolean(self) != 0
 when GINT_TYPE 
 result = ::GObject .g_value_get_int self
 when GUINT64_TYPE 
 result = ::GObject .g_value_get_uint64 self
 when GDOUBLE_TYPE 
 result = ::GObject .g_value_get_double self
 when GSTR_TYPE 
 result = ::GObject .g_value_get_string self
 when Vips ::REFSTR_TYPE 
 len = Vips ::SizeStruct .new
 result = ::Vips .vips_value_get_ref_string self, len
 when Vips ::ARRAY_INT_TYPE 
 len = Vips ::IntStruct .new
 array = Vips .vips_value_get_array_int self, len
 result = array.get_array_of_int32 0, len[:value]
 when Vips ::ARRAY_DOUBLE_TYPE 
 len = Vips ::IntStruct .new
 array = Vips .vips_value_get_array_double self, len
 result = array.get_array_of_double 0, len[:value]
 when Vips ::ARRAY_IMAGE_TYPE 
 len = Vips ::IntStruct .new
 array = Vips .vips_value_get_array_image self, len
 result = array.get_array_of_pointer 0, len[:value]
 result.map! do |pointer|
 ::GObject .g_object_ref pointer
 Vips ::Image .new  pointer
 end
 when Vips ::BLOB_TYPE 
 len = Vips ::SizeStruct .new
 array = Vips .vips_value_get_blob self, len
 result = array.get_bytes 0, len[:value]
 else
 case fundamental
 when GFLAGS_TYPE 
 result = ::GObject .g_value_get_flags self
 when GENUM_TYPE 
 enum_value = ::GObject .g_value_get_enum(self)
 result = GValue .to_nick  self[:gtype], enum_value
 when GOBJECT_TYPE 
 obj = ::GObject .g_value_get_object self
 # g_value_get_object() does not add a ref ... we need to add
 # one to match the unref in gobject release
 ::GObject .g_object_ref obj
 result = Vips ::Image .new  obj
 else
 raise Vips ::Error , "unimplemented gtype for get: " \
 "#{::GObject .g_type_name gtype} (#{gtype})"
 end
 end
 # GLib::logger.debug("GObject::GValue.get") {
 # "result = #{result.inspect[0..50]}"
 # }

 result
end

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# File 'lib/vips/gvalue.rb', line 79
def init gtype
 ::GObject .g_value_init self, gtype
end

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# File 'lib/vips/gvalue.rb', line 87
def set value
 # GLib::logger.debug("GObject::GValue.set") {
 # "value = #{value.inspect[0..50]}"
 # }

 gtype = self[:gtype]
 fundamental = ::GObject .g_type_fundamental gtype
 case gtype
 when GBOOL_TYPE 
 ::GObject .g_value_set_boolean self, (value ? 1 : 0)
 when GINT_TYPE 
 ::GObject .g_value_set_int self, value
 when GUINT64_TYPE 
 ::GObject .g_value_set_uint64 self, value
 when GDOUBLE_TYPE 
 ::GObject .g_value_set_double self, value
 when GSTR_TYPE 
 ::GObject .g_value_set_string self, value
 when Vips ::REFSTR_TYPE 
 ::Vips .vips_value_set_ref_string self, value
 when Vips ::ARRAY_INT_TYPE 
 value = [value] unless value.is_a? Array
 Vips .vips_value_set_array_int self, nil, value.length
 ptr = Vips .vips_value_get_array_int self, nil
 ptr.write_array_of_int32 value
 when Vips ::ARRAY_DOUBLE_TYPE 
 value = [value] unless value.is_a? Array
 # this will allocate an array in the gvalue
 Vips .vips_value_set_array_double self, nil, value.length
 # pull the array out and fill it
 ptr = Vips .vips_value_get_array_double self, nil
 ptr.write_array_of_double value
 when Vips ::ARRAY_IMAGE_TYPE 
 value = [value] unless value.is_a? Array
 Vips .vips_value_set_array_image self, value.length
 ptr = Vips .vips_value_get_array_image self, nil
 ptr.write_array_of_pointer value
 # the gvalue needs a ref on each of the images
 value.each { |image| ::GObject .g_object_ref image }
 when Vips ::BLOB_TYPE 
 len = value.bytesize
 ptr = GLib .g_malloc len
 Vips .vips_value_set_blob self, GLib ::G_FREE , ptr, len
 ptr.write_bytes value
 else
 case fundamental
 when GFLAGS_TYPE 
 ::GObject .g_value_set_flags self, value
 when GENUM_TYPE 
 enum_value = GValue .from_nick (self[:gtype], value)
 ::GObject .g_value_set_enum self, enum_value
 when GOBJECT_TYPE 
 ::GObject .g_value_set_object self, value
 else
 raise Vips ::Error , "unimplemented gtype for set: " \
 "#{::GObject .g_type_name gtype} (#{gtype})"
 end
 end
end

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# File 'lib/vips/gvalue.rb', line 253
def unset
 ::GObject .g_value_unset self
end