Class: IiifPrint::PDFDerivativeService

Inherits:
BaseDerivativeService show all
Defined in:
lib/iiif_print/pdf_derivative_service.rb

Constant Summary collapse

GRAY_PDF_CMD =

PDF (JPEG, 8 bit grayscale), 150ppi

'convert %<source_file>s ' \
'-resize 1800 -density 150 ' \
'-depth 8 -colorspace Gray ' \
'-compress jpeg %<out_file>s'.freeze
COLOR_PDF_CMD =

sRBG color PDF (JPEG, 8 bits per channel), 150ppi

'convert %<source_file>s ' \
'-resize 1800 -density 150 ' \
'-depth 8 ' \
'-compress jpeg %<out_file>s'.freeze

Instance Attribute Summary

Attributes inherited from BaseDerivativeService

#file_set, #master_format

Instance Method Summary collapse

Methods inherited from BaseDerivativeService

#cleanup_derivatives, #derivative_path_factory, #identify, #im_convert, #jp2_convert, #jp2_to_intermediate, #load_destpath, #mime_type, #mime_type_for, #one_bit?, #prepare_path, #use_color?, #valid?

Constructor Details

#initialize(file_set) ⇒ PDFDerivativeService

Returns a new instance of PDFDerivativeService.



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# File 'lib/iiif_print/pdf_derivative_service.rb', line 19

def initialize(file_set)
  super(file_set)
end

Instance Method Details

#convert_cmd ⇒ Object

Get conversion command; command varies on whether or not we have

JP2 source, and whether we have color or grayscale material.



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# File 'lib/iiif_print/pdf_derivative_service.rb', line 25

def convert_cmd
  template = use_color? ? COLOR_PDF_CMD : GRAY_PDF_CMD
  data = format(template, source_file: @source_path, out_file: @dest_path)
  IiifPrint.copy_derivatives_from_data_store(stream: data, directives: { url: file_set.id.to_s, container: 'service_file', mime_type: mime_type_for(target_extension) })
  data
end

#create_derivatives(filename) ⇒ Object 



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# File 'lib/iiif_print/pdf_derivative_service.rb', line 32

def create_derivatives(filename)
  # Base class takes care of loading @source_path, @dest_path
  super(filename)

  # no creation if pdf master
  return if mime_type == 'application/pdf'

  # Get and run conversion command
  return jp2_convert if mime_type == 'image/jp2'
  im_convert
end