code: def _get_texture_format_for_data(self, data, internalformat=None):
      return None
  
file_path: vispy/vispy/visuals/tests/test_scalable_textures.py
imports: import numpy
  import pytest
  from vispy.testing import run_tests_if_main
  from vispy.visuals._scalable_textures import get_default_clim_from_dtype, get_default_clim_from_data, CPUScaledTextureMixin, GPUScaledTextureMixin
label_desc: Use image node_id 1 for calling the GPUScaledStub obj's underlying member method code with example usage: obj._get_texture_format_for_data(data, internalformat) and returns: None