From 30ee8efe5d67c2c6839f812bd47797eb8a406bd2 Mon Sep 17 00:00:00 2001
From: Benjamin Hubert <benjamin@alpixel.fr>
Date: Fri, 8 Jan 2016 19:09:22 +0100
Subject: [PATCH 1/5] creating optipng post processor

---
 .../Filter/PostProcessor/OptiPngPostProcessor | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Imagine/Filter/PostProcessor/OptiPngPostProcessor

diff --git a/Imagine/Filter/PostProcessor/OptiPngPostProcessor b/Imagine/Filter/PostProcessor/OptiPngPostProcessor
new file mode 100644
index 000000000..c85fac2e1
--- /dev/null
+++ b/Imagine/Filter/PostProcessor/OptiPngPostProcessor
@@ -0,0 +1,62 @@
+<?php
+
+namespace Liip\ImagineBundle\Imagine\Filter\PostProcessor;
+
+use Liip\ImagineBundle\Binary\BinaryInterface;
+use Liip\ImagineBundle\Imagine\Filter\PostProcessor\PostProcessorInterface;
+use Liip\ImagineBundle\Model\Binary;
+use Symfony\Component\Process\Exception\ProcessFailedException;
+use Symfony\Component\Process\ProcessBuilder;
+
+class OptiPngPostProcessor implements PostProcessorInterface
+{
+    /** @var string Path to optipng binary */
+    protected $optipng;
+
+    /**
+     * Constructor.
+     *
+     * @param string $optipngBin Path to the optipng binary
+     */
+    public function __construct($optipngBin = '/usr/bin/optipng')
+    {
+        $this->optipngBin = $optipngBin;
+    }
+
+    /**
+     * @param BinaryInterface $binary
+     *
+     * @throws ProcessFailedException
+     *
+     * @return BinaryInterface
+     *
+     * @see      Implementation taken from Assetic\Filter\optipngFilter
+     */
+    public function process(BinaryInterface $binary)
+    {
+        $type = strtolower($binary->getMimeType());
+        if (!in_array($type, array('image/png'))) {
+            return $binary;
+        }
+
+        $pb = new ProcessBuilder(array($this->optipngBin));
+
+        $pb->add('--o7');
+        $pb->add($input = tempnam(sys_get_temp_dir(), 'imagine_optipng'));
+        file_put_contents($input, $binary->getContent());
+
+        $proc = $pb->getProcess();
+        $proc->run();
+
+        if (false !== strpos($proc->getOutput(), 'ERROR') || 0 !== $proc->getExitCode()) {
+            unlink($input);
+            throw new ProcessFailedException($proc);
+        }
+
+        $result = new Binary(file_get_contents($input), $binary->getMimeType(), $binary->getFormat());
+
+        unlink($input);
+
+        return $result;
+    }
+}

From 2fb52fdfd66469a3455a5f73acf5cab5615f1d2b Mon Sep 17 00:00:00 2001
From: Benjamin Hubert <benjamin@alpixel.fr>
Date: Fri, 8 Jan 2016 19:10:47 +0100
Subject: [PATCH 2/5] Update imagine.xml for optipng support

---
 Resources/config/imagine.xml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Resources/config/imagine.xml b/Resources/config/imagine.xml
index dc4928539..056f002c7 100644
--- a/Resources/config/imagine.xml
+++ b/Resources/config/imagine.xml
@@ -66,9 +66,11 @@
 
         <!-- Post processors' classes -->
         <parameter key="liip_imagine.filter.post_processor.jpegoptim.class">Liip\ImagineBundle\Imagine\Filter\PostProcessor\JpegOptimPostProcessor</parameter>
-
         <parameter key="liip_imagine.jpegoptim.binary">/usr/bin/jpegoptim</parameter>
 
+        <parameter key="liip_imagine.filter.post_processor.optipng.class">Liip\ImagineBundle\Imagine\Filter\PostProcessor\OptiPngPostProcessor</parameter>
+        <parameter key="liip_imagine.optipng.binary">/usr/bin/optipng</parameter>
+
     </parameters>
 
     <services>
@@ -269,5 +271,9 @@
             <argument>%liip_imagine.jpegoptim.binary%</argument>
             <tag name="liip_imagine.filter.post_processor" post_processor="jpegoptim" />
         </service>
+        <service id="liip_imagine.filter.post_processor.optipng" class="%liip_imagine.filter.post_processor.optipng.class%">
+            <argument>%liip_imagine.optipng.binary%</argument>
+            <tag name="liip_imagine.filter.post_processor" post_processor="optipng" />
+        </service>
     </services>
 </container>

From 5324ebfce152dabaa8954feb534ac55b79288d54 Mon Sep 17 00:00:00 2001
From: Benjamin HUBERT <benjamin@alpixel.fr>
Date: Wed, 20 Jan 2016 14:56:15 +0100
Subject: [PATCH 3/5] Fixing class name typo

---
 .../{OptiPngPostProcessor => OptiPngPostProcessor.php}            | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename Imagine/Filter/PostProcessor/{OptiPngPostProcessor => OptiPngPostProcessor.php} (100%)

diff --git a/Imagine/Filter/PostProcessor/OptiPngPostProcessor b/Imagine/Filter/PostProcessor/OptiPngPostProcessor.php
similarity index 100%
rename from Imagine/Filter/PostProcessor/OptiPngPostProcessor
rename to Imagine/Filter/PostProcessor/OptiPngPostProcessor.php

From 1934b1ead687b275b0a7cdf4aa44c71b899b0527 Mon Sep 17 00:00:00 2001
From: Benjamin HUBERT <benjamin@alpixel.fr>
Date: Wed, 20 Jan 2016 15:14:55 +0100
Subject: [PATCH 4/5] Removing an useless namespace

---
 Imagine/Filter/PostProcessor/OptiPngPostProcessor.php | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Imagine/Filter/PostProcessor/OptiPngPostProcessor.php b/Imagine/Filter/PostProcessor/OptiPngPostProcessor.php
index c85fac2e1..4227f11a0 100644
--- a/Imagine/Filter/PostProcessor/OptiPngPostProcessor.php
+++ b/Imagine/Filter/PostProcessor/OptiPngPostProcessor.php
@@ -3,7 +3,6 @@
 namespace Liip\ImagineBundle\Imagine\Filter\PostProcessor;
 
 use Liip\ImagineBundle\Binary\BinaryInterface;
-use Liip\ImagineBundle\Imagine\Filter\PostProcessor\PostProcessorInterface;
 use Liip\ImagineBundle\Model\Binary;
 use Symfony\Component\Process\Exception\ProcessFailedException;
 use Symfony\Component\Process\ProcessBuilder;

From d81660717c0d2ef92fbe1c7cdc15c1ea09ccd718 Mon Sep 17 00:00:00 2001
From: Benjamin Hubert <benjamin@alpixel.fr>
Date: Wed, 20 Jan 2016 21:26:08 +0100
Subject: [PATCH 5/5] Update filters.rst

---
 Resources/doc/filters.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Resources/doc/filters.rst b/Resources/doc/filters.rst
index 7307d1119..bf7e5e30d 100644
--- a/Resources/doc/filters.rst
+++ b/Resources/doc/filters.rst
@@ -380,3 +380,15 @@ parameters, for example:
         liip_imagine.jpegoptim.binary: /usr/local/bin/jpegoptim
 
 .. _`Symfony Service Container`: http://symfony.com/doc/current/book/service_container.html
+
+
+The ``OptiPngPostProcessor`` is also available by default and can be used just as jpegoptim. 
+Make sure that optipng binary is installed on the system and change the 
+``liip_imagine.optipng.binary`` in parameters if needed.
+
+.. code-block:: yaml
+
+    parameters:
+        liip_imagine.optipng.binary: /usr/local/bin/optipng
+
+.. _`Symfony Service Container`: http://symfony.com/doc/current/book/service_container.html