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#!/usr/bin/env ruby
# Copyright (C) 2017 Ruby-GNOME2 Project Team
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# usage :
# ruby number-pdf.rb example.pdf
require "poppler"
require "pango"
input = ARGV.first
output = input.sub(/\.pdf$/, "-numbered.pdf")
doc = Poppler::Document.new(input)
first_page = doc[0]
Cairo::PDFSurface.new(output, *first_page.size) do |surface|
context = Cairo::Context.new(surface)
doc.each_with_index do |page, i|
width, height = page.size
surface.set_size(width, height)
context.save do
context.render_poppler_page(page)
end
context.save do
layout = context.create_pango_layout
layout.text = i.to_s
layout.width = width * Pango::SCALE
layout.alignment = :center
layout.font_description = Pango::FontDescription.new("Sans 288")
context.move_to(0, (height - layout.pixel_size[1]) / 2.0)
context.set_source_rgba(0.1, 0.1, 0.1, 0.5)
context.show_pango_layout(layout)
end
context.show_page
end
end
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