Method: Magick::Image#quantum_operator

Defined in:

ext/RMagick/rmimage.c

#quantum_operator(*args) ⇒ Object

This method is an adapter method that calls the EvaluateImageChannel method.

Ruby usage:

- @verbatim Image#quantum_operator(operator, rvalue) @endverbatim
- @verbatim Image#quantum_operator(operator, rvalue, channel) @endverbatim
- @verbatim Image#quantum_operator(operator, rvalue, channel, ...) @endverbatim

Notes:

- Historically this method used QuantumOperatorRegionImage in
  GraphicsMagick. By necessity this method implements the "lowest common
  denominator" of the two implementations.
- Default channel is AllChannels

Parameters:

• argc —

  number of input arguments

• argv —

  array of input arguments

• self —

  this object

Returns:

• self

# File 'ext/RMagick/rmimage.c', line 10150

VALUE
Image_quantum_operator(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    QuantumExpressionOperator operator;
    MagickEvaluateOperator qop;
    double rvalue;
    ChannelType channel;
    ExceptionInfo exception;

    image = rm_check_destroyed(self);

    // The default channel is AllChannels
    channel = AllChannels;

    /*
        If there are 3 arguments, argument 2 is a ChannelType argument.
        Arguments 1 and 0 are required and are the rvalue and operator,
        respectively.
    */
    switch (argc)
    {
        case 3:
            VALUE_TO_ENUM(argv[2], channel, ChannelType);
            /* Fall through */
        case 2:
            rvalue = NUM2DBL(argv[1]);
            VALUE_TO_ENUM(argv[0], operator, QuantumExpressionOperator);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
            break;
    }

    // Map QuantumExpressionOperator to MagickEvaluateOperator
    switch (operator)
    {
        default:
        case UndefinedQuantumOperator:
            qop = UndefinedEvaluateOperator;
            break;
        case AddQuantumOperator:
            qop = AddEvaluateOperator;
            break;
        case AndQuantumOperator:
            qop = AndEvaluateOperator;
            break;
        case DivideQuantumOperator:
            qop = DivideEvaluateOperator;
            break;
        case LShiftQuantumOperator:
            qop = LeftShiftEvaluateOperator;
            break;
        case MaxQuantumOperator:
            qop = MaxEvaluateOperator;
            break;
        case MinQuantumOperator:
            qop = MinEvaluateOperator;
            break;
        case MultiplyQuantumOperator:
            qop = MultiplyEvaluateOperator;
            break;
        case OrQuantumOperator:
            qop = OrEvaluateOperator;
            break;
        case RShiftQuantumOperator:
            qop = RightShiftEvaluateOperator;
            break;
        case SubtractQuantumOperator:
            qop = SubtractEvaluateOperator;
            break;
        case XorQuantumOperator:
            qop = XorEvaluateOperator;
            break;
#if defined(HAVE_ENUM_POWEVALUATEOPERATOR)
        case PowQuantumOperator:
            qop = PowEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_LOGEVALUATEOPERATOR)
        case LogQuantumOperator:
            qop = LogEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_THRESHOLDEVALUATEOPERATOR)
        case ThresholdQuantumOperator:
            qop = ThresholdEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_THRESHOLDBLACKEVALUATEOPERATOR)
        case ThresholdBlackQuantumOperator:
            qop = ThresholdBlackEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_THRESHOLDWHITEEVALUATEOPERATOR)
        case ThresholdWhiteQuantumOperator:
            qop = ThresholdWhiteEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_GAUSSIANNOISEEVALUATEOPERATOR)
        case GaussianNoiseQuantumOperator:
            qop = GaussianNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_IMPULSENOISEEVALUATEOPERATOR)
        case ImpulseNoiseQuantumOperator:
            qop = ImpulseNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_LAPLACIANNOISEEVALUATEOPERATOR)
        case LaplacianNoiseQuantumOperator:
            qop = LaplacianNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_MULTIPLICATIVENOISEEVALUATEOPERATOR)
        case MultiplicativeNoiseQuantumOperator:
            qop = MultiplicativeNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_POISSONNOISEEVALUATEOPERATOR)
        case PoissonNoiseQuantumOperator:
            qop = PoissonNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_UNIFORMNOISEEVALUATEOPERATOR)
        case UniformNoiseQuantumOperator:
            qop = UniformNoiseEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_COSINEEVALUATEOPERATOR)
        case CosineQuantumOperator:
            qop = CosineEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_SINEEVALUATEOPERATOR)
        case SineQuantumOperator:
            qop = SineEvaluateOperator;
            break;
#endif
#if defined(HAVE_ENUM_ADDMODULUSEVALUATEOPERATOR)
        case AddModulusQuantumOperator:
            qop = AddModulusEvaluateOperator;
            break;
#endif
    }

    GetExceptionInfo(&exception);
    (void) EvaluateImageChannel(image, channel, qop, rvalue, &exception);
    CHECK_EXCEPTION()

    (void) DestroyExceptionInfo(&exception);

    return self;
}