function Scale::validateArguments

Overrides Resize::validateArguments

File

core/modules/system/src/Plugin/ImageToolkit/Operation/gd/Scale.php, line 46

Class

Scale

Defines GD2 Scale operation.

Namespace

Code

protected function validateArguments(array $arguments) {
  // Assure at least one dimension.
  if (empty($arguments['width']) && empty($arguments['height'])) {
    throw new \InvalidArgumentException("At least one dimension ('width' or 'height') must be provided to the image 'scale' operation");
  }
  // Calculate one of the dimensions from the other target dimension,
  // ensuring the same aspect ratio as the source dimensions. If one of the
  // target dimensions is missing, that is the one that is calculated. If both
  // are specified then the dimension calculated is the one that would not be
  // calculated to be bigger than its target.
  $aspect = $this->getToolkit()
    ->getHeight() / $this->getToolkit()
    ->getWidth();
  if ($arguments['width'] && !$arguments['height'] || $arguments['width'] && $arguments['height'] && $aspect < $arguments['height'] / $arguments['width']) {
    $arguments['height'] = (int) round($arguments['width'] * $aspect);
  }
  else {
    $arguments['width'] = (int) round($arguments['height'] / $aspect);
  }
  // Assure integers for all arguments.
  $arguments['width'] = (int) round($arguments['width']);
  $arguments['height'] = (int) round($arguments['height']);
  // Fail when width or height are 0 or negative.
  if ($arguments['width'] <= 0) {
    throw new \InvalidArgumentException("Invalid width ('{$arguments['width']}') specified for the image 'scale' operation");
  }
  if ($arguments['height'] <= 0) {
    throw new \InvalidArgumentException("Invalid height ('{$arguments['height']}') specified for the image 'scale' operation");
  }
  return $arguments;
}