class HexaPDF::CLI::Optimize
Optimizes the size of a PDF file.
def execute(in_file, out_file) #:nodoc:
def execute(in_file, out_file) #:nodoc: maybe_raise_on_existing_file(out_file) with_document(in_file, password: @password, out_file: out_file) do |doc| optimize_page_tree(doc) apply_optimization_options(doc) end end
def initialize #:nodoc:
def initialize #:nodoc: super('optimize', takes_commands: false) short_desc("Optimize the size of a PDF file") long_desc(<<~EOF) This command uses several optimization strategies to reduce the file size of the PDF file. By default, all strategies except page compression are used since page compression may take a very long time without much benefit. EOF @password = nil @out_options.compact = true @out_options.xref_streams = :generate @out_options.object_streams = :generate @out_options.streams = :compress @out_options.optimize_fonts = true options.on("--password PASSWORD", "-p", String, "The password for decryption. Use - for reading from standard input.") do |pwd| @password = (pwd == '-' ? read_password : pwd) end options.separator("") options.separator("Optimization options") define_optimization_options end
def optimize_page_tree(doc)
def optimize_page_tree(doc) page_tree = doc.add({Type: :Pages}) retained = {page_tree.data => true} doc.pages.each do |page| page.value.update(page.copy_inherited_values) page_tree.add_page(page) retained[page.data] = true end doc.catalog[:Pages] = page_tree doc.each do |obj, revision| next unless obj.kind_of?(HexaPDF::Dictionary) if (obj.type == :Pages || obj.type == :Page) && !retained.key?(obj.data) revision.delete(obj) end end end