convert images for sprite_demo about pico-playground HOT 3 OPEN

Duplicate of #16 ?

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Seems like OP fixed it, but didn't provide much detail on how. I tried the script he mentioned and did not have any luck.

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Just in case anyone else finds this, here are some tips if you want to use the packfiles script:

1. Make sure your image is the right size. For sprite_demo, make it 128x128 OR edit the berry[i].log_size = 7 line to be whatever power of 2 you want your images to be.
2. If your image has transparency, use python packtiles.py -sdmf bgar5515 INPUT.png OUTPUT.h. Note the .h on the output. The flags are important: s makes a single image, and m adds transparency metadata. If your image does NOT have transparency, remove the m flag. d is not so important but makes your image look nice.
3. If your image does NOT have transparency, you need to change berry[i].has_opacity_metadata = false;. Otherwise, the code will read part of your image as a mask. :)
4. Edit the produced .h file to have the name you want and edit the imports in the main file.

Good luck!

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