protected function Opacity::execute in Image Effects 8.2

Same name in this branch

1. 8.2 src/Plugin/ImageToolkit/Operation/gd/Opacity.php \Drupal\image_effects\Plugin\ImageToolkit\Operation\gd\Opacity::execute()
2. 8.2 src/Plugin/ImageToolkit/Operation/imagemagick/Opacity.php \Drupal\image_effects\Plugin\ImageToolkit\Operation\imagemagick\Opacity::execute()

Same name and namespace in other branches

1. 8.3 src/Plugin/ImageToolkit/Operation/imagemagick/Opacity.php \Drupal\image_effects\Plugin\ImageToolkit\Operation\imagemagick\Opacity::execute()
2. 8 src/Plugin/ImageToolkit/Operation/imagemagick/Opacity.php \Drupal\image_effects\Plugin\ImageToolkit\Operation\imagemagick\Opacity::execute()

File

src/Plugin/ImageToolkit/Operation/imagemagick/Opacity.php, line 26

Class

Opacity

Defines ImageMagick Opacity operation.

Namespace

Drupal\image_effects\Plugin\ImageToolkit\Operation\imagemagick

Code

protected function execute(array $arguments) {
  if ($this
    ->getToolkit()
    ->getExecManager()
    ->getPackage() === 'graphicsmagick') {

    // GraphicsMagick does not support -alpha argument, return early.
    // @todo implement a GraphicsMagick solution if possible.
    return FALSE;
  }
  switch ($arguments['opacity']) {
    case 100:

      // Fully opaque, leave image as-is.
      break;
    case 0:

      // Fully transparent, set full transparent for all pixels.
      $this
        ->addArgument("-alpha set -channel Alpha -evaluate Set 0%");
      break;
    default:

      // Divide existing alpha to the opacity needed. This preserves
      // partially transparent images.
      $divide = number_format((double) (100 / $arguments['opacity']), 4, '.', ',');
      $this
        ->addArgument("-alpha set -channel Alpha -evaluate Divide {$divide}");
      break;
  }
  return TRUE;
}