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figure.export() usage outside of a notebook #714

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@FlynnOConnell

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@FlynnOConnell
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figure.export() will only work if show() is called first and export() is called in a separate cell.

This works:

import fastplotlib as fpl
import numpy as np

random_3d = np.random.randn(100, 100, 100)
iw = fpl.ImageWidget(data=random_3d)
iw.show()

Image

iw.figure.export('./random.png')

Image

This does not:

import fastplotlib as fpl
import numpy as np

random_3d = np.random.randn(100, 100, 100)
iw = fpl.ImageWidget(data=random_3d)
iw.show()
iw.figure.export('./random.png')
iw.close()

AttributeError                            Traceback (most recent call last)
Cell In[12], line 9
      7 iw = lcp.plot_contours(cnmf_df, -1)
      8 iw.show()
----> 9 iw.figure.export('./test.png')
     10 iw.close()
     12 # lcp.save_contours(cnmf_df, -1, './test.png')

File [~/miniforge3/envs/lcp/lib/python3.10/site-packages/fastplotlib/layouts/_figure.py:596](http://localhost:8888/home/flynn/miniforge3/envs/lcp/lib/python3.10/site-packages/fastplotlib/layouts/_figure.py#line=595), in Figure.export(self, uri, **kwargs)
    590     raise ImportError(
    591         "imageio is required to use Figure.export(). Install it using pip or conda:\n"
    592         "pip install imageio\n"
    593         "conda install -c conda-forge imageio\n"
    594     )
    595 else:
--> 596     snapshot = self.renderer.snapshot()
    597     remove_alpha = True
    599     # image formats that support alpha channel:
    600     # https://en.wikipedia.org/wiki/Alpha_compositing#Image_formats_supporting_alpha_channels

File ~/miniforge3/envs/lcp/lib/python3.10/site-packages/pygfx/renderers/wgpu/engine/renderer.py:789, in WgpuRenderer.snapshot(self)
    786 """Create a snapshot of the currently rendered image."""
    788 # Prepare
--> 789 texture = self._blender.color_tex
    790 size = texture.size
    791 bytes_per_pixel = 4

AttributeError: 'Ordered2FragmentBlender' object has no attribute 'color_tex'

This is more of an issue when I have built an image widget in a separate function, I'd like to save a image of the widget before returning it to the user without needing to render it.

Is this possible?

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