Class: JPEG2PDF

Inherits:
Object
  • Object
show all
Includes:
RPDF
Defined in:
lib/jpeg2pdf.rb

Constant Summary

Constants included from RPDF

RPDF::EOL, RPDF::VERSION_10, RPDF::VERSION_11, RPDF::VERSION_12, RPDF::VERSION_13, RPDF::VERSION_14, RPDF::VERSION_15, RPDF::VERSION_DEFAULT

Instance Method Summary collapse

Methods included from RPDF

includes_delimiter?, includes_whitespace?, topdfobject

Constructor Details

#initialize(pdf) ⇒ JPEG2PDF

Returns a new instance of JPEG2PDF.



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# File 'lib/jpeg2pdf.rb', line 36

def initialize(pdf)
  @doc = Document.new(pdf)
  @imagenumber = 0
end

Instance Method Details

#add_jpeg(filename) ⇒ Object 



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# File 'lib/jpeg2pdf.rb', line 41

def add_jpeg(filename)
  jpegfile = File.open(filename)
  imagedata = jpegfile.read
  jpegfile.close
  size = ImageSize.new(imagedata)
  if(size.get_type == 'JPEG')
    width = size.get_width
    height = size.get_height
    bpc = size.get_bpc
    components = size.get_components
    if components == 1
      colorspace = :DeviceGray
    elsif components == 3
      colorspace = :DeviceRGB
    elsif components == 4
      colorspace = :DeviceCMYK
    else
      raise Exception.new("Unsupported colorspace in image #{filename}")
    end

    imagestream = PDFStream.new(imagedata, @doc)
    imagestream.dict[:Filter] = [:DCTDecode]
    imagestream.dict[:Name] = "Image#{@imagenumber}".intern

    imagedictionary = ImageDictionary.new(width, height, colorspace, bpc)
    imagestream.dict.update(imagedictionary)
 imagestream.invalidate # write jpeg as soon as possible

    page = Page.new(@doc, @doc.pagetree)
    page[:MediaBox] = [0, 0, width, height]
    page[:Resources] = { :XObject => { "Image#{@imagenumber}".intern => imagestream } }

    contentstream = PDFStream.new("q\n#{width} 0 0 #{height} 0 0 cm\n/Image#{@imagenumber} Do\nQ", @doc)

    page[:Contents] = contentstream
    @imagenumber = @imagenumber + 1
  end
end

#close ⇒ Object 



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# File 'lib/jpeg2pdf.rb', line 80

def close
  @doc.close_pdf
end