List out all Core Image filters with macruby

list_core_image_filters.rb

framework "Quartz"

# Available Categories:
=begin
KCICategoryDistortionEffect - Distortion effects, such as bump, twirl, hole
KCICategoryGeometryAdjustment - Geometry adjustment, such as affine transform, crop, perspective transform
KCICategoryCompositeOperation - Compositing, such as source over, minimum, source atop, color dodge blend mode
KCICategoryHalftoneEffect - Halftone effects, such as screen, line screen, hatched
KCICategoryColorAdjustment - Color adjustment, such as gamma adjust, white point adjust, exposure
KCICategoryColorEffect - Color effect, such as hue adjust, posterize
KCICategoryTransition - Transitions between images, such as dissolve, disintegrate with mask, swipe
KCICategoryTileEffect - Tile effect, such as parallelogram, triangle, op
KCICategoryGenerator - Image generator, such as stripes, constant color, checkerboard
KCICategoryGradient - Gradient, such as axial, radial, Gaussian
KCICategoryStylize - Stylize, such as pixellate, crystallize
KCICategorySharpen - Sharpen, luminance
KCICategoryBlur - Blur, such as Gaussian, zoom, motion
=end
filters = CIFilter.filterNamesInCategories([KCICategoryCompositeOperation])


filters.each do |filter_name|
  puts filter_name
  filter = CIFilter.filterWithName(filter_name)
  attributes_hash = filter.attributes
  attributes_hash.each_pair do |key, value|
    if value.instance_of?(Hash)
      puts "\t#{key} - {"
      value.each_pair do |k,v|
        puts "\t\t#{k} - #{v}"
      end
      puts "\t}"
    elsif value.instance_of?(Array)
      puts "\t#{key} - ["
      value.each{|j| puts "\t\t#{j}"}
      puts "\t]"
    elsif value.instance_of?(NSURL)
      puts "\t#{key} - #{value.absoluteString}"
    else      
      puts "\t#{key} - #{value}"
    end
  end
  puts ""
end