レシピに書かれていないこと: PDFサムネイル

$PDFサムネイル require 'poppler' require 'cairo' document = Poppler::Document.new("sample.pdf") page = document[0] scale = 0.25 width, height = page.size.collect {|x| x * scale} surface = Cairo::ImageSurface.new(width, height) context = Cairo::Context.new(surface) context.scale(scale, scale) context.render_poppler_page(page) surface.write_to_png("/tmp/thumbnail.png")$

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