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   1  <?php
   2  
   3  
   4  namespace splitbrain\slika;
   5  
   6  /**
   7   * Image Processing Adapter for ImageMagick's command line utility `convert`
   8   */
   9  class ImageMagickAdapter extends Adapter
  10  {
  11      /** @var array the CLI arguments to run imagemagick */
  12      protected $args = [];
  13  
  14      /** @inheritDoc */
  15      public function __construct($imagepath, $options = [])
  16      {
  17          parent::__construct($imagepath, $options);
  18  
  19          if (!is_executable($this->options['imconvert'])) {
  20              throw new Exception('Can not find or run ' . $this->options['imconvert']);
  21          }
  22  
  23          $this->args[] = $this->options['imconvert'];
  24          $this->args[] = $imagepath;
  25      }
  26  
  27      /** @inheritDoc */
  28      public function autorotate()
  29      {
  30          $this->args[] = '-auto-orient';
  31          return $this;
  32      }
  33  
  34      /** @inheritDoc */
  35      public function rotate($orientation)
  36      {
  37          $orientation = (int)$orientation;
  38          if ($orientation < 0 || $orientation > 8) {
  39              throw new Exception('Unknown rotation given');
  40          }
  41  
  42          // rotate
  43          $this->args[] = '-rotate';
  44          if (in_array($orientation, [3, 4])) {
  45              $this->args[] = '180';
  46          } elseif (in_array($orientation, [5, 6])) {
  47              $this->args[] = '90';
  48          } elseif (in_array($orientation, [7, 8])) {
  49              $this->args[] = '270';
  50          }
  51  
  52          // additionally flip
  53          if (in_array($orientation, [2, 5, 7, 4])) {
  54              $this->args[] = '-flop';
  55          }
  56          return $this;
  57      }
  58  
  59      /**
  60       * @inheritDoc
  61       * @throws Exception
  62       */
  63      public function resize($width, $height)
  64      {
  65          if ($width == 0 && $height == 0) {
  66              throw new Exception('You can not resize to 0x0');
  67          }
  68          if ($width == 0) $width = '';
  69          if ($height == 0) $height = '';
  70  
  71          $size = $width . 'x' . $height;
  72  
  73          $this->args[] = '-resize';
  74          $this->args[] = $size;
  75          return $this;
  76      }
  77  
  78      /**
  79       * @inheritDoc
  80       * @throws Exception
  81       */
  82      public function crop($width, $height)
  83      {
  84          if ($width == 0 && $height == 0) {
  85              throw new Exception('You can not crop to 0x0');
  86          }
  87  
  88          if ($width == 0) $width = $height;
  89          if ($height == 0) $height = $width;
  90  
  91          $size = $width . 'x' . $height;
  92  
  93          $this->args[] = '-resize';
  94          $this->args[] = "$size^";
  95          $this->args[] = '-gravity';
  96          $this->args[] = 'center';
  97          $this->args[] = '-crop';
  98          $this->args[] = "$size+0+0";
  99          $this->args[] = '+repage';
 100          return $this;
 101      }
 102  
 103      /**
 104       * @inheritDoc
 105       * @throws Exception
 106       */
 107      public function save($path, $extension = '')
 108      {
 109          if ($extension === 'jpg') {
 110              $extension = 'jpeg';
 111          }
 112  
 113          $this->args[] = '-quality';
 114          $this->args[] = $this->options['quality'];
 115  
 116          if ($extension !== '') $path = $extension . ':' . $path;
 117          $this->args[] = $path;
 118  
 119          $args = array_map('escapeshellarg', $this->args);
 120  
 121          $cmd = join(' ', $args);
 122          $output = [];
 123          $return = 0;
 124          exec($cmd, $output, $return);
 125  
 126          if ($return !== 0) {
 127              throw new Exception('ImageMagick returned non-zero exit code for ' . $cmd);
 128          }
 129      }
 130  }