gfx/layers/genTables.py

   1 #!/usr/bin/python
   2
   3 def table_generator(f):
   4   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)])
   5
   6 with open("PremultiplyTables.h", "w") as f:
   7   f.write("const uint8_t PremultiplyTable[256*256] = {\n");
   8   f.write(table_generator(lambda i: ((i / 256) * (i % 256) + 254) / 255) + "\n")
   9   f.write("};\n");
  10   f.write("const uint8_t UnpremultiplyTable[256*256] = {\n");
  11   f.write(table_generator(lambda i: (i % 256) * 255 / ((i / 256) if (i / 256) > 0 else 255) % 256) + "\n")
  12   f.write("};\n");