Method: Magick::Image#fx

Defined in:
ext/RMagick/rmimage.cpp

#fx(expression, channel = Magick::AllChannels) ⇒ Magick::Image #fx(expression, *channels) ⇒ Magick::Image

Apply fx on the image.

Overloads:

  • #fx(expression, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • expression (String) —

      A mathematical expression

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #fx(expression, *channels) ⇒ Magick::Image

    Parameters:

    • expression (String) —

      A mathematical expression

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



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# File 'ext/RMagick/rmimage.cpp', line 7458

VALUE
Image_fx(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    char *expression;
    ChannelType channels;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There must be exactly 1 remaining argument.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (0 for 1 or more)");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    expression = StringValueCStr(argv[0]);

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(FxImage) args = { image, expression, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FxImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(FxImageChannel) args = { image, channels, expression, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FxImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}