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Add a ``figure-mpl`` directive that is a responsive version of ``figure``.
This implementation is very similar to ``.. figure::``, except it also allows a
``srcset=`` argument to be passed to the image tag, hence allowing responsive
resolution images.
There is no particular reason this could not be used standalone, but is meant
to be used with :doc:`/api/sphinxext_plot_directive_api`.
Note that the directory organization is a bit different than ``.. figure::``.
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Implements a directive to allow an optional hidpi image.
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and gets set in the TEMPLATE of plot_directive.py
e.g.::
.. figure-mpl:: plot_directive/some_plots-1.png
:alt: bar
:srcset: plot_directive/some_plots-1.png,
plot_directive/some_plots-1.2x.png 2.00x
:class: plot-directive
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:alt: bar
:srcset: plot_directive/nestedpage/index-1.png
plot_directive/nestedpage/index-1.2x.png 2.00x
:class: plot_directive
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where the subdirectory is included in the image name for uniqueness.
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