// Return the mask bit for "getMaskPattern" at "x" and "y". See 8.8 of JISX0510:2004 for mask
// pattern conditions.
public static bool GetDataMaskBit(int maskPattern, int x, int y)
{
if (!QRCode.IsValidMaskPattern(maskPattern))
{
throw new ArgumentException("Invalid mask pattern");
}
int intermediate, temp;
switch (maskPattern)
{
case 0:
intermediate = (y + x) & 0x1;
break;
case 1:
intermediate = y & 0x1;
break;
case 2:
intermediate = x % 3;
break;
case 3:
intermediate = (y + x) % 3;
break;
case 4:
intermediate = ((y >> 1) + (x / 3)) & 0x1;
break;
case 5:
temp = y * x;
intermediate = (temp & 0x1) + (temp % 3);
break;
case 6:
temp = y * x;
intermediate = (((temp & 0x1) + (temp % 3)) & 0x1);
break;
case 7:
temp = y * x;
intermediate = (((temp % 3) + ((y + x) & 0x1)) & 0x1);
break;
default:
throw new ArgumentException("Invalid mask pattern: " + maskPattern);
}
return(intermediate == 0);
}