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46 lines
1.5 KiB
Python
46 lines
1.5 KiB
Python
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#!/usr/bin/env python3
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import PIL.Image # https://pillow.readthedocs.io/
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import util
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# snowflake.png is the source image. The source image MUST have a white background,
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# but other colors and pixel depth are irrelevant. This one is black & white.
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# Due to the Apple II pixel aspect ratio, we do a 1-time aspect-ratio-losing resize
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# to squash the image to 92% height.
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#
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# $ gm convert snowflake.png -resize "100%x92%!" squash.png
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# (Depending on your shell, you may need to escape the exclamation point. Grr.)
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#
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# Now we can create individual images for each "frame" of the animation, by
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# resizing the (squashed) source image and putting it in a 280x192 frame.
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#
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# $ for w in `seq 1 500`; do \
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# gm convert -size 160x100 squash.png \
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# -resize "$w" \
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# -background white \
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# -compose Copy \
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# -gravity center \
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# -extent 160x100 thumb"$w".png; \
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# done
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#
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# Depending on the source image, you may need more or fewer than 500 frames. This
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# number is duplicated below in the |frames| variable. Sorry.
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#
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frames = 500 # number of "thumbN.png" files
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coords = []
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for i in range(1,frames):
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p = PIL.Image.open("snowflake/thumb%s.png" % i)
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for x in range(0, 160//2):
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for y in range(0, 100//2):
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if p.getpixel((x,99-y))[0] != 255:
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coords.append((y*2,x))
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unique_coords = util.unique(coords)
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util.write("../../../src/fx/fx.shr.snowflake.data.a", unique_coords, header="""!cpu 6502
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!to "build/FX/SHR.FLAKE.DATA",plain
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*=$9F00
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""")
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