Class: ImageOptim::Worker::Jpegtran

Inherits:
ImageOptim::Worker show all
Defined in:
lib/image_optim/worker/jpegtran.rb

Overview

www.ijg.org/

Uses jpegtran through jpegrescan if enabled, jpegrescan is vendored with this gem

Constant Summary collapse

COPY_CHUNKS_OPTION = 
option(:copy_chunks, false, 'Copy all chunks'){ |v| !!v }
PROGRESSIVE_OPTION = 
option(:progressive, true, 'Create progressive JPEG file'){ |v| !!v }
JPEGRESCAN_OPTION = 
option(:jpegrescan, true, 'Use jpegtran through jpegrescan, ' \
'ignore progressive option'){ |v| !!v }

Instance Method Summary collapse

Methods inherited from ImageOptim::Worker

#image_formats, #initialize, #inspect, #optimized?, #options, #resolve_used_bins!, #run_order

Methods included from ClassMethods

#bin_sym, #create_all, #create_all_by_format, extended, #inherited, #klasses, #option, #option_definitions

Constructor Details

This class inherits a constructor from ImageOptim::Worker

Instance Method Details

#optimize(src, dst, options = {}) ⇒ Object 



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# File 'lib/image_optim/worker/jpegtran.rb', line 26

def optimize(src, dst, options = {})
  if jpegrescan
    args = %W[
      #{src}
      #{dst}
    ]
    args.unshift '-s' unless copy_chunks
    resolve_bin!(:jpegtran)
    execute(:jpegrescan, args, options) && optimized?(src, dst)
  else
    args = %W[
      -optimize
      -outfile #{dst}
      #{src}
    ]
    args.unshift '-copy', (copy_chunks ? 'all' : 'none')
    args.unshift '-progressive' if progressive
    execute(:jpegtran, args, options) && optimized?(src, dst)
  end
end

#used_bins ⇒ Object 



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# File 'lib/image_optim/worker/jpegtran.rb', line 22

def used_bins
  jpegrescan ? [:jpegtran, :jpegrescan] : [:jpegtran]
end