Contents

require 'mini_magick'

module Hydra::Derivatives::Processors
  class RawImage < Image
    class_attribute :timeout

    protected

    def create_image(destination_name, format, quality=nil)
      xfrm = load_image_transformer
      # Transpose format and scaling due to the fact that ImageMagick can
      # read but not write RAW files and this will otherwise cause many
      # cryptic segmentation faults
      xfrm.format(format)
      yield(xfrm) if block_given?
      xfrm.quality(quality.to_s) if quality
      write_image(destination_name, format, xfrm)
      remove_temp_files(xfrm)
    end

    # Delete any temp files that might clutter up the disk if
    # you are doing a batch or don't touch your temporary storage
    # for a long time
    def remove_temp_files(xfrm)
      xfrm.destroy!
    end

    # Override this method if you want a different transformer, or # need to load the raw image from a different source (e.g.
    # external file).
    #
    # In this case always add an extension to help out MiniMagick
    # with RAW files
    def load_image_transformer
      MiniMagick::Image.open(source_path)
    end
  end
end

Version data entries

7 entries across 7 versions & 1 rubygems

Version	Path
hydra-derivatives-3.1.3	lib/hydra/derivatives/processors/raw_image.rb
hydra-derivatives-3.1.2	lib/hydra/derivatives/processors/raw_image.rb
hydra-derivatives-3.1.1	lib/hydra/derivatives/processors/raw_image.rb
hydra-derivatives-3.1.0	lib/hydra/derivatives/processors/raw_image.rb
hydra-derivatives-3.0.2	lib/hydra/derivatives/processors/raw_image.rb
hydra-derivatives-3.0.1	lib/hydra/derivatives/processors/raw_image.rb
hydra-derivatives-3.0.0	lib/hydra/derivatives/processors/raw_image.rb