Initial commit

site/OFF_plugins/imagekit/lib/optimizer/mozjpeg.php

@@ -0,0 +1,100 @@
+<?php
+
+namespace Kirby\Plugins\ImageKit\Optimizer;
+
+
+/**
+ *  Uses `mozjpeg` for encoding JPEG files. This often creates
+ *  much smaller JPEG files than most other encoders at a
+ *  comparable quality.
+ *
+ *  See: https://github.com/mozilla/mozjpeg
+ */
+class MozJPEG extends Base {
+
+  public static $selector    = ['image/jpeg'];
+  public $priority           = [100, 5];
+  
+  protected $targetFile;
+  protected $tmpFile;
+
+
+  public static function defaults() {
+    return [
+      'imagekit.mozjpeg.bin'         => null,
+      'imagekit.mozjpeg.quality'     => 85,
+      'imagekit.mozjpeg.flags'       => '',
+    ];
+  }
+
+  public static function available() {
+    return !empty(static::$kirby->option('imagekit.mozjpeg.bin'));
+  }
+
+  public function pre() {
+    $this->targetFile = $this->thumb->destination->root;
+
+    if($this->isDriver('im')) {
+      // Instruct imagemagick driver to write out a temporary,
+      // uncrompressed TGA file, so our JPEG will not be
+      // compressed twice. I played around with PNM too,
+      // because it’s much faster as an intermediate format,
+      // but some images got corrupted by mozjpeg.
+      $this->tmpFile = $this->getTemporaryFilename('tga');
+      $this->thumb->destination->root = $this->tmpFile;
+    } else {
+      // If GD driver (or an unknown driver) is active, we
+      // need to encode twice, because SimpleImage can only
+      // save to JPEG, PNG or GIF. As saving a 24-bit
+      // lossless PNG as an intermediate step is too
+      // expensive for large images, we need to encode
+      // as JPEG :-(
+      // This also needs a temporary file, because it seems
+      // that mozjpeg cannot overwrite the it’s file.
+      $this->tmpFile = $this->getTemporaryFilename();
+      $this->thumb->destination->root = $this->tmpFile;
+      $this->thumb->options['quality'] = 99;
+    }
+  }
+
+  public function post() {
+
+    $command = [];
+
+    $command[] = static::$kirby->option('imagekit.mozjpeg.bin');    
+    
+    // Quality
+    $command[] = '-quality ' . $this->option('imagekit.mozjpeg.quality');
+
+    // Interlace
+    if($this->thumb->options['interlace']) {
+      $command[] = '-progressive';
+    }
+
+    // Grayscale
+    if($this->thumb->options['grayscale']) {
+      $command[] = '-grayscale';
+    }
+
+    // Set output file.
+    $command[] = '-outfile "' . $this->targetFile . '"';
+
+    $flags = $this->option('imagekit.mozjpeg.flags');
+    if(!empty($flags)) {
+      // Add exra flags, if defined by user.
+      $command[] = $flags;
+    }
+    
+    // Use tmp file as input.
+    $command[] = '"' . $this->tmpFile . '"';
+
+    exec(implode(' ', $command));
+    // Delete temporary file and restore destination path
+    // on thumb object. This only needs to be done, if
+    // ImageMagick driver is used and the input file was
+    // in PNM format.
+    @unlink($this->tmpFile);
+    $this->thumb->destination->root = $this->targetFile;
+  }
+
+}