Jeff Epler 2ec2761ce0 bitmaptools: add alphablend
This blends two "565"-format bitmaps, including byteswapped ones. All
the bitmaps have to have the same memory format.

The routine takes about 63ms on a Kaluga when operating on 320x240 bitmaps.
Of course, displaying the bitmap also takes time.

There's untested code for the L8 (8-bit greyscale) case. This can be
enabled once gifio is merged.
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CircuitPython
=============

.. image:: https://s3.amazonaws.com/adafruit-circuit-python/CircuitPython_Repo_header_logo.png

|Build Status| |Doc Status| |License| |Discord| |Weblate|

`circuitpython.org <https://circuitpython.org>`__ \| `Get CircuitPython <#get-circuitpython>`__ \|
`Documentation <#documentation>`__ \| `Contributing <#contributing>`__ \|
`Branding <#branding>`__ \| `Differences from Micropython <#differences-from-micropython>`__ \|
`Project Structure <#project-structure>`__

**CircuitPython** is a *beginner friendly*, open source version of Python for tiny, inexpensive
computers called microcontrollers.

This package contains the "stubs", or type definitions for CircuitPython.  With some advanced
editors and other tools, this information can be identify TypeErrors, AttributeErrors, and other
problems before you deploy your code to a device and can even help autocomplete your code.

.. |Build Status| image:: https://github.com/adafruit/circuitpython/workflows/Build%20CI/badge.svg
   :target: https://github.com/adafruit/circuitpython/actions?query=branch%3Amain
.. |Doc Status| image:: https://readthedocs.org/projects/circuitpython/badge/?version=latest
   :target: http://circuitpython.readthedocs.io/
.. |Discord| image:: https://img.shields.io/discord/327254708534116352.svg
   :target: https://adafru.it/discord
.. |License| image:: https://img.shields.io/badge/License-MIT-brightgreen.svg
   :target: https://choosealicense.com/licenses/mit/
.. |Weblate| image:: https://hosted.weblate.org/widgets/circuitpython/-/svg-badge.svg
   :target: https://hosted.weblate.org/engage/circuitpython/?utm_source=widget
Languages
C 90.2%
Python 7.4%
Makefile 1.8%
Shell 0.2%