.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/offscreen_hdr.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_gallery_offscreen_hdr.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_offscreen_hdr.py:


Render offscreen using a 16bit (HDR) render target
--------------------------------------------------

Render a wgpu example offscreen, safe to 16bit PNG, and show the result.

.. GENERATED FROM PYTHON SOURCE LINES 8-48

.. code-block:: Python


    import os
    import tempfile
    import webbrowser

    import numpy as np
    import png  # provided by the pypng package

    from rendercanvas.offscreen import RenderCanvas

    try:
        from .triangle import setup_drawing_sync
    except ImportError:
        from triangle import setup_drawing_sync


    canvas = RenderCanvas(size=(640, 480), pixel_ratio=2)
    draw_frame = setup_drawing_sync(canvas.get_wgpu_context(), format="rgba16float")
    canvas.request_draw(draw_frame)

    image = canvas.draw()
    image = np.asarray(image)

    # Convert to RGB
    image = image[:, :, :3]

    # Convert float16 to uint16
    image = (image.astype(np.float32) * 65535).astype("uint16")


    # Save with pypng. It's API is not great, but imageio/pillow cannot do 16bit png
    filename = os.path.join(tempfile.gettempdir(), "wgpuexample.png")
    with open(filename, "wb") as f:
        writer = png.Writer(
            width=image.shape[1], height=image.shape[0], bitdepth=16, greyscale=False
        )
        writer.write(f, image.reshape(image.shape[0], -1).tolist())

    # Show the written file
    webbrowser.open("file://" + filename)


.. _sphx_glr_download_gallery_offscreen_hdr.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: offscreen_hdr.ipynb <offscreen_hdr.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: offscreen_hdr.py <offscreen_hdr.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: offscreen_hdr.zip <offscreen_hdr.zip>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_