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, false, 'Use jpegtran through jpegrescan, '\
'ignore progressive option'){ |v| !!v }

Instance Method Summary collapse

Methods inherited from ImageOptim::Worker

#<=>, bin_sym, #image_formats, inherited, #initialize, klasses, #optimized?, option, option_definitions, #run_order

Constructor Details

This class inherits a constructor from ImageOptim::Worker

Instance Method Details

#optimize(src, dst) ⇒ Object 



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# File 'lib/image_optim/worker/jpegtran.rb', line 20

def optimize(src, dst)
  if jpegrescan
    args = %W[#{src} #{dst}]
    args.unshift '-s' unless copy_chunks
    resolve_bin!(:jpegtran)
    execute(:jpegrescan, *args) && 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) && optimized?(src, dst)
  end
end