class Magick::OptionalMethodArguments

# File lib/rmagick_internal.rb, line 1832
def initialize(img)
  @img = img
end

# File lib/rmagick_internal.rb, line 1842
def define(key, val = nil)
  @img.define(key, val)
end

# File lib/rmagick_internal.rb, line 1847
def highlight_color=(color)
  define_compare_color('highlight-color', color)
end

# File lib/rmagick_internal.rb, line 1852
def lowlight_color=(color)
  define_compare_color('lowlight-color', color)
end

# File lib/rmagick_internal.rb, line 1837
def method_missing(mth, val)
  @img.define(mth.to_s.tr('_', '-'), val)
end

# File lib/rmagick_internal.rb, line 1858
def define_compare_color(name, color)
  color = if color.is_a?(Magick::Pixel)
            color.to_color(Magick::AllCompliance, true)
          else
            String.try_convert(color) || raise(TypeError, "argument must be color name or pixel (#{color.class} given)")
          end
  @img.define("compare:#{name}", color)
  # ImageMagick 6.9.6-0 and older read the name without the "compare:" prefix.
  @img.define(name, color)
end