Sha256: a277db705d0ff8f0b6f2152d798492efef0a18730301ca13b36cd051467e772d
Contents?: true
Size: 1.76 KB
Versions: 9
Compression:
Stored size: 1.76 KB
Contents
# frozen_string_literal: true
module Riiif
# Builds a command to run a transformation using Kakadu
class KakaduCommandFactory
class_attribute :external_command
self.external_command = 'kdu_expand'
# A helper method to instantiate and invoke build
# @param [String] path the location of the file
# @param info [ImageInformation] information about the source
# @param [Transformation] transformation
def initialize(path, info, transformation)
@path = path
@info = info
@transformation = transformation
end
attr_reader :path, :info, :transformation
# @param tmp_file [String] the path to the temporary file
# @return [String] a command for running kdu_expand to produce the requested output
def command(tmp_file)
[external_command, quiet, input, threads, region, reduce, output(tmp_file)].join
end
def reduction_factor
@reduction_factor ||= Resize.new(transformation.size, info).reduction_factor
end
private
def input
" -i #{path}"
end
def output(output_filename)
" -o #{output_filename}"
end
def threads
' -num_threads 4'
end
def quiet
' -quiet'
end
def region
region_arg = Crop.new(transformation.region, info).to_kakadu
" -region \"#{region_arg}\"" if region_arg
end
# kdu_expand is not capable of arbitrary scaling, but it does
# offer a -reduce argument which is capable of downscaling by
# factors of 2, significantly speeding decompression. We can
# use it if either the percent is <=50, or the height/width
# are <=50% of full size.
def reduce
" -reduce #{reduction_factor}" if reduction_factor && reduction_factor != 0
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems