Add image() support, big buffer on CPython and some linux demos pt.2

adafruit / Adafruit_CircuitPython_RGB_Display

Drivers for RGB displays for Adafruit CircuitPython.

MIT License

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Closed caternuson closed 4 years ago

caternuson commented 4 years ago

This is a continuation of #27 with only tweaks as needed to pass Travis.

The logic dealing with setting _BUFFER_SIZE had to change a fair amount.

Can't use const() in conditional, so removed it and just changed to regular variable.
For the FT232H special case, there is a pyftdi internal limit on SPI write size. A check for this has been added.