old_contents: # -*- coding: utf-8 -*-
  #  Copyright 2011 Takeshi KOMIYA
  #
  #  Licensed under the Apache License, Version 2.0 (the "License");
  #  you may not use this file except in compliance with the License.
  #  You may obtain a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  #  Unless required by applicable law or agreed to in writing, software
  #  distributed under the License is distributed on an "AS IS" BASIS,
  #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #  See the License for the specific language governing permissions and
  #  limitations under the License.
  
  from blockdiag.noderenderer import NodeShape
  from blockdiag.noderenderer import install_renderer
  from blockdiag.utils import images, Box, XY
  
  
  class TextBox(NodeShape):
      def __init__(self, node, metrics=None):
          super(TextBox, self).__init__(node, metrics)
  
          if self.node.background:
              size = images.get_image_size(self.node.background)
              size = images.calc_image_size(size, self.textbox)
  
              pt = self.textbox.center
              self.textbox = Box(pt.x - size[0] / 2, pt.y - size[1] / 2,
                                 pt.x + size[0] / 2, pt.y + size[1] / 2)
  
              self.connectors[0] = XY(pt.x, self.textbox[1])
              self.connectors[1] = XY(self.textbox[2], pt.y)
              self.connectors[2] = XY(pt.x, self.textbox[3])
              self.connectors[3] = XY(self.textbox[0], pt.y)
  
          if self.node.icon:
              self.connectors[3] = XY(self.iconbox[0], pt.y)
  
      def render_shape(self, drawer, format, **kwargs):
          if not kwargs.get('shadow') and self.node.background:
              drawer.loadImage(self.node.background, self.textbox)
  
  
  def setup(self):
      install_renderer('textbox', TextBox)
  
new_contents: # -*- coding: utf-8 -*-
  #  Copyright 2011 Takeshi KOMIYA
  #
  #  Licensed under the Apache License, Version 2.0 (the "License");
  #  you may not use this file except in compliance with the License.
  #  You may obtain a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  #  Unless required by applicable law or agreed to in writing, software
  #  distributed under the License is distributed on an "AS IS" BASIS,
  #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #  See the License for the specific language governing permissions and
  #  limitations under the License.
  
  from blockdiag.noderenderer import NodeShape
  from blockdiag.noderenderer import install_renderer
  from blockdiag.utils import images, Box, XY
  
  
  class TextBox(NodeShape):
      def __init__(self, node, metrics=None):
          super(TextBox, self).__init__(node, metrics)
  
          if self.node.background:
              size = images.get_image_size(self.node.background)
              size = images.calc_image_size(size, self.textbox.size)
  
              pt = self.textbox.center
              self.textbox = Box(pt.x - size[0] / 2, pt.y - size[1] / 2,
                                 pt.x + size[0] / 2, pt.y + size[1] / 2)
  
              self.connectors[0] = XY(pt.x, self.textbox[1])
              self.connectors[1] = XY(self.textbox[2], pt.y)
              self.connectors[2] = XY(pt.x, self.textbox[3])
              self.connectors[3] = XY(self.textbox[0], pt.y)
  
          if self.node.icon:
              self.connectors[3] = XY(self.iconbox[0], pt.y)
  
      def render_shape(self, drawer, format, **kwargs):
          if not kwargs.get('shadow') and self.node.background:
              drawer.loadImage(self.node.background, self.textbox)
  
  
  def setup(self):
      install_renderer('textbox', TextBox)
  
subject: Fix background image on textbox shape was shrinked