Class: Asciidoctor::PDF::Optimizer::RGhost

Inherits:
Base show all
Defined in:
lib/asciidoctor/pdf/optimizer/rghost.rb

Constant Summary collapse

DEFAULT_PARAMS = 
%w(gs -dNOPAUSE -dBATCH -dQUIET -dNOPAGEPROMPT)

Instance Attribute Summary

Attributes included from Asciidoctor::PDF::Optimizer

#compatibility_level, #compliance, #quality

Instance Method Summary collapse

Methods included from Factory

#for, #register

Constructor Details

#initialize(*_args) ⇒ RGhost

Returns a new instance of RGhost.



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# File 'lib/asciidoctor/pdf/optimizer/rghost.rb', line 51

def initialize *_args
  super
  if @quality&.include? ':'
    @quality, @color_mode = @quality.split ':', 2
  else
    @color_mode = nil
  end
  if (gs_path = ::ENV['GS'])
    ::RGhost::Config::GS[:path] = gs_path
  end
  @newpdf = false
  default_params = DEFAULT_PARAMS.drop 0
  if (user_params = ::ENV['GS_OPTIONS'])
    (default_params += user_params.split).uniq!
    @newpdf = nil if default_params.find {|it| it.start_with? '-dNEWPDF=' }
  end
  ::RGhost::Config::GS[:default_params] = default_params
end

Instance Method Details

#optimize_file(target) ⇒ Object 



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# File 'lib/asciidoctor/pdf/optimizer/rghost.rb', line 70

def optimize_file target
  ::Dir::Tmpname.create ['asciidoctor-pdf-', '.pdf'] do |tmpfile|
    filename_o = ::Pathname.new target
    filename_tmp = ::Pathname.new tmpfile
    if (pdfmark = filename_o.sub_ext '.pdfmark').file?
      inputs = [target, pdfmark.to_s].join ::File::PATH_SEPARATOR
    else
      inputs = target
    end
    d = { Printed: false, CannotEmbedFontPolicy: '/Warning', CompatibilityLevel: @compatibility_level }
    d[:NEWPDF] = @newpdf unless @newpdf.nil?
    case @compliance
    when 'PDF/A', 'PDF/A-1', 'PDF/A-2', 'PDF/A-3'
      d[:PDFA] = ((@compliance.split '-', 2)[1] || 1).to_i
      d[:ShowAnnots] = false
    when 'PDF/X', 'PDF/X-1', 'PDF/X-3'
      d[:PDFX] = true
      d[:ShowAnnots] = false
    end
    case @color_mode
    when 'gray', 'grayscale'
      s = { ColorConversionStrategy: 'Gray' }
    when 'bw'
      d[:BlackText] = true
      s = { ColorConversionStrategy: 'Gray' }
    end
    (::RGhost::Convert.new inputs).to :pdf, filename: filename_tmp.to_s, quality: QUALITY_NAMES[@quality], d: d, s: s
    filename_o.binwrite filename_tmp.binread
  end
  nil
end