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#!/usr/bin/python
from __future__ import print_function
import sys
def table_generator(f):
return ",\n".join([", ".join(["0x%2.2x" % h for h in [f(i) for i in range(r,r+16)]]) for r in range(0, 65536, 16)])
def generate(output):
output.write("const uint8_t gfxUtils::sPremultiplyTable[256*256] = {\n");
output.write(table_generator(lambda i: ((i / 256) * (i % 256) + 254) / 255) + "\n")
output.write("};\n");
output.write("const uint8_t gfxUtils::sUnpremultiplyTable[256*256] = {\n");
output.write(table_generator(lambda i: (i % 256) * 255 / ((i / 256) if (i / 256) > 0 else 255) % 256) + "\n")
output.write("};\n");
if __name__ == '__main__':
if len(sys.argv) != 2:
print("Usage: genTables.py <header.h>", file=sys.stderr)
sys.exit(1)
with open(sys.argv[1], 'w') as f:
generate(f)
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