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#!/usr/bin/env ruby
require "poppler"
if ARGV.size != 2
puts "usage: #{$0} input.pdf output.pdf"
exit(-1)
end
input, output = ARGV
doc = Poppler::Document.new(input)
width, height = doc[0].size
Cairo::PDFSurface.new(output, width / 2, height) do |surface|
context = Cairo::Context.new(surface)
doc.each do |page|
width, height = page.size
half_width = width / 2
context.save do
context.rectangle(0, 0, half_width, height)
context.clip
page.render(context)
context.show_page
end
context.save do
context.translate(-half_width, 0)
context.rectangle(half_width, 0, half_width, height)
context.clip
page.render(context)
context.show_page
end
end
end
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