Zopfli worker

.travis.yml

@@ -13,7 +13,7 @@ rvm:
 script: bundle exec rspec
 before_install:
   - sudo apt-get update -qq
-  - sudo apt-get install -qq advancecomp gifsicle jhead jpegoptim libjpeg-progs optipng pngcrush
+  - sudo apt-get install -qq advancecomp gifsicle jhead jpegoptim libjpeg-progs optipng pngcrush zopfli
   - wget http://static.jonof.id.au/dl/kenutils/pngout-20130221-linux.tar.gz
   - tar -xzf pngout-*-linux.tar.gz
   - mv pngout-*-linux pngout-linux

README.markdown

@@ -10,6 +10,7 @@ Optimize (lossless compress) images (jpeg, png, gif) using external utilities:
 * [optipng](http://optipng.sourceforge.net/)
 * [pngcrush](http://pmt.sourceforge.net/pngcrush/)
 * [pngout](http://www.advsys.net/ken/util/pngout.htm)
+* [zopfli](https://code.google.com/p/zopfli/)
 
 Based on [ImageOptim.app](http://imageoptim.com/).
 

lib/image_optim.rb

@@ -247,7 +247,7 @@ def processor_count
 end
 
 %w[
-  pngcrush pngout optipng advpng
+  pngcrush pngout optipng advpng zopfli
   jhead jpegoptim jpegtran
   gifsicle
 ].each do |worker|

lib/image_optim/worker/zopfli.rb

@@ -0,0 +1,22 @@
+require 'image_optim/worker'
+
+class ImageOptim
+  class Worker
+    class Zopfli < Worker
+      def image_formats
+        [:png]
+      end
+
+      option(:splitlast, false, 'Do block splitting last instead of first'){ |v| !!v }
+
+      option(:iterations, 15, 'Perform # iterations (default 15). More gives more compression but is slower. Examples: 10, 50, 1000') do |v|
+        OptionHelpers.limit_with_range(v.to_i, 1..1000)
+      end
+
+      def optimize(src, dst)
+        args = %W[-c #{"--splitlast" if splitlast} -i#{iterations} #{src} > #{dst}]
+        execute(:zopfli, *args) && optimized?(src, dst)
+      end
+    end
+  end
+end