Class: Hyperimage::ImagesController

Inherits:
ApplicationController show all
Defined in:
app/controllers/hyperimage/images_controller.rb

Instance Method Summary collapse

Instance Method Details

#show ⇒ Object

Raises:

  • (ActionController::RoutingError) 


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# File 'app/controllers/hyperimage/images_controller.rb', line 7

def show
  # Return HTTP 404 if no resource exists
  raise ActionController::RoutingError.new('Not Found') unless Hyperimage::Image.exist?(params[:resource])

  # If there's a GIF, select it (since it could have multiple frames);
  # otherwise, pick the first image.
  if Hyperimage::Image.exists?(params[:resource], 'gif')
    source = Hyperimage::Image.first(params[:resource], 'gif')
  else
    source = Hyperimage::Image.first(params[:resource])
  end

  source_file = Magick::Image::read(source)

  # If no frame is explicitly passed, default to the first (zeroth) frame
  frame = params[:frame].to_i

  # Return HTTP 404 if frame is out of range
  raise ActionController::RoutingError.new('Not Found') unless (0..(source_file.length - 1)).include?(frame)

  # Try to fetch the image
  @image = Hyperimage::Image.first(params[:resource], params[:format], frame)

  if @image.nil? # We need to generate the image
    if source_file.length > 1
      path = Hyperimage::Image.root.join(params[:resource])
      Dir.mkdir(path) unless File.exists?(path)
      @image = path.join([frame, params[:format]].join('.'))
    else
      @image = Hyperimage::Image.root.join([params[:resource], params[:format]].join('.'))
    end
    source_file[frame].write(@image) { self.quality = 100}
  end

  mime_type = Mime::Type.lookup_by_extension(File.extname(@image).sub('.', ''))
  send_file @image, :type => mime_type.to_s, :disposition => 'inline'
end