Class: Tootsie::Processors::ImageProcessor

Inherits:
Object
  • Object
show all
Defined in:
lib/tootsie/processors/image_processor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ ImageProcessor

Returns a new instance of ImageProcessor.



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# File 'lib/tootsie/processors/image_processor.rb', line 6

def initialize(params = {})
  @input_url = params[:input_url]
  @versions = [params[:versions] || {}].flatten
  @logger = Application.get.logger
  @extractor = ImageMetadataExtractor.new(:logger => @logger)
end

Instance Attribute Details

#input_url ⇒ Object

Returns the value of attribute input_url.



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# File 'lib/tootsie/processors/image_processor.rb', line 197

def input_url
  @input_url
end

#versions ⇒ Object

Returns the value of attribute versions.



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# File 'lib/tootsie/processors/image_processor.rb', line 198

def versions
  @versions
end

Instance Method Details

#execute!(&block) ⇒ Object 



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# File 'lib/tootsie/processors/image_processor.rb', line 24

def execute!(&block)
  result = {:outputs => []}
  input, output = Input.new(@input_url), nil
  begin
    input.get!
    begin
      versions.each_with_index do |version_options, version_index|
        version_options = version_options.with_indifferent_access
        @logger.info("Handling version: #{version_options.inspect}")
        
        output = Output.new(version_options[:target_url])
        begin
          result[:metadata] ||= @extractor.extract_from_file(input.file_name)
          
          original_depth = nil
          original_width = nil
          original_height = nil
          original_type = nil
          original_format = nil
          original_orientation = nil
          CommandRunner.new("identify -format '%z %w %h %m %[EXIF:Orientation] %r' :file").
            run(:file => input.file_name) do |line|
            if line =~ /(\d+) (\d+) (\d+) ([^\s]+) (\d+)? (.+)/
              original_depth, original_width, original_height = $~[1, 3].map(&:to_i)
              original_format = $4.downcase
              original_orientation = $5.try(:to_i)
              original_type = $6
            end
          end
          unless original_width and original_height
            raise "Unable to determine dimensions of input image"
          end

          if (output_format = version_options[:format])
            # Sanitize format so we can use it in file name
            output_format = output_format.to_s
            output_format.gsub!(/[^\w]/, '')
          end
          output_format ||= original_format

          # Correct for EXIF orientation
          if [5, 6, 7, 8].include?(original_orientation)
            original_width, original_height = original_height, original_width
          end

          original_aspect = original_height / original_width.to_f

          result[:width] = original_width
          result[:height] = original_height
          result[:depth] = original_depth
          
          medium = version_options[:medium]
          medium &&= medium.to_sym

          new_width, new_height = version_options[:width], version_options[:height]
          if new_width
            new_height ||= (new_width * original_aspect).ceil
          elsif new_height
            new_width ||= (new_height / original_aspect).ceil
          else
            new_width, new_height = original_width, original_height
          end

          scale_width, scale_height = new_width, new_height
          scale = (version_options[:scale] || 'down').to_sym
          case scale
            when :up, :none
              # Do nothing
            when :down
              if scale_width > original_width
                scale_width = original_width
                scale_height = (scale_width * original_aspect).ceil
              elsif scale_height > original_height
                scale_height = original_height
                scale_width = (scale_height / original_aspect).ceil
              end
            when :fit
              if (scale_width * original_aspect).ceil < new_height
                scale_height = new_height
                scale_width = (new_height / original_aspect).ceil
              elsif (scale_height / original_aspect).ceil < new_width
                scale_width = new_width
                scale_height = (scale_width * original_aspect).ceil
              end
          end
          
          convert_command = "convert"
          convert_options = {
            :input_file => input.file_name,
            :output_file => "'#{output_format}:#{output.file_name}'"
          }

          # Animations may contain more than one fram, if so discard the
          # extra frames when outputting in a non-animation format
          if original_format == 'gif' and version_options[:format] != 'gif'
            convert_command << ' -flatten -scene 1'
          end

          if scale != :none
            convert_command << " -resize :resize"
            convert_options[:resize] = "#{scale_width}x#{scale_height}"
          end
          if version_options[:crop]
            convert_command << " -gravity center -crop :crop"
            convert_command << " +repage"  # This fixes some animations
            convert_options[:crop] = "#{new_width}x#{new_height}+0+0"
          end
          if version_options[:strip_metadata]
            convert_command << " +profile :remove_profiles -set comment ''"
            convert_options[:remove_profiles] = "8bim,iptc,xmp,exif"
          end

          convert_command << " -quality #{((version_options[:quality] || 1.0) * 100).ceil}%"

          if original_format =~ /^(jpeg|tiff)$/i
            # Work around a problem with ImageMagick being too clever and "optimizing"
            # the bit depth of RGB images that contain a single grayscale channel.
            # Coincidentally, this avoids ImageMagick rewriting the ICC data and
            # corrupting it in the process.
            if original_type =~ /(?:Gray|RGB)(Matte)?$/
              convert_command << " -type TrueColor#{$1}"
            end
          end

          # Fix CMYK images
          if medium == :web and original_type =~ /CMYK/
            convert_command << " -colorspace rgb"
          end

          # Auto-orient images when web or we're stripping EXIF
          if medium == :web or version_options[:strip_metadata]
            convert_command << " -auto-orient"
          end

          if original_format == 'gif' and output_format == 'gif'
            # Work around ImageMagick problem that screws up animations unless the
            # animation frames are "coalesced" first.
            convert_command = "convert -coalesce :input_file - | #{convert_command} - :output_file"
          else
            convert_command << " :input_file :output_file"
          end

          CommandRunner.new(convert_command).run(convert_options)
          
          if version_options[:format] == 'png'
            Tempfile.open('tootsie') do |file|
              # TODO: Make less sloppy
              file.write(File.read(output.file_name))
              file.close
              CommandRunner.new('pngcrush :input_file :output_file').run(
                :input_file => file.path, :output_file => output.file_name)
            end
          end
          
          output.content_type = version_options[:content_type] if version_options[:content_type]
          output.content_type ||= case version_options[:format]
            when 'jpeg' then 'image/jpeg'
            when 'png' then 'image/png'
            when 'gif' then 'image/gif'
          end
          output.put!
          result[:outputs] << {:url => output.result_url}
        ensure
          output.close
        end
      end
    end
  ensure
    input.close
  end
  result
end

#params ⇒ Object 



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# File 'lib/tootsie/processors/image_processor.rb', line 17

def params
  return {
    :input_url => @input_url,
    :versions => @versions
  }
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tootsie/processors/image_processor.rb', line 13

def valid?
  return @input_url && !@versions.blank?
end