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import argparse
import subprocess
import png
import struct
parser=argparse.ArgumentParser(description="Converts extracted texture png files to the swapped data that Animal Forest expects.")
parser.add_argument("input")
parser.add_argument("output")
args=parser.parse_args()
reader = png.Reader(filename=args.input)
width, height, rows, info = reader.read()
rowIndex: int = 0
outputData: bytearray = bytearray()
for row in rows:
if rowIndex % 2 == 0:
# odd row, just copy as is
outputData.extend(row)
else:
# even row, swap groups of 8 pixels, or 64 bits
for swapBlock in struct.iter_unpack(">QQ", row):
outputData.extend(struct.pack(">QQ", swapBlock[1], swapBlock[0]))
rowIndex += 1
newPngPath = args.output[:-14] + "_swapped.png"
output = open(newPngPath, 'wb')
writer = png.Writer(width, height, **info)
writer.write_array(output, outputData)
output.close()
# use pigment64 to convert it to .inc.c
subprocess.run(["tools/pigment64/pigment64", "to-bin", "-f", "ci4", "--c-array", "-o", args.output, newPngPath])
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