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class Rotate in Zircon Profile 8

Same name and namespace in other branches
  1. 8.0 core/modules/system/src/Plugin/ImageToolkit/Operation/gd/Rotate.php \Drupal\system\Plugin\ImageToolkit\Operation\gd\Rotate

Defines GD2 rotate operation.

Plugin annotation


@ImageToolkitOperation(
  id = "gd_rotate",
  toolkit = "gd",
  operation = "rotate",
  label = @Translation("Rotate"),
  description = @Translation("Rotates an image by the given number of degrees.")
)

Hierarchy

Expanded class hierarchy of Rotate

1 string reference to 'Rotate'
ImageTest::testRotate in core/tests/Drupal/Tests/Core/Image/ImageTest.php
Tests \Drupal\Core\Image\Image::rotate().

File

core/modules/system/src/Plugin/ImageToolkit/Operation/gd/Rotate.php, line 23
Contains \Drupal\system\Plugin\ImageToolkit\Operation\gd\Rotate.

Namespace

Drupal\system\Plugin\ImageToolkit\Operation\gd
View source 
class Rotate extends GDImageToolkitOperationBase {

  /**
   * {@inheritdoc}
   */
  protected function arguments() {
    return array(
      'degrees' => array(
        'description' => 'The number of (clockwise) degrees to rotate the image',
      ),
      'background' => array(
        'description' => "A string specifying the hexadecimal color code to use as background for the uncovered area of the image after the rotation. E.g. '#000000' for black, '#ff00ff' for magenta, and '#ffffff' for white. For images that support transparency, this will default to transparent white",
        'required' => FALSE,
        'default' => NULL,
      ),
    );
  }

  /**
   * {@inheritdoc}
   */
  protected function validateArguments(array $arguments) {

    // PHP 5.5 GD bug: https://bugs.php.net/bug.php?id=65148: To prevent buggy
    // behavior on negative multiples of 90 degrees we convert any negative
    // angle to a positive one between 0 and 360 degrees.
    $arguments['degrees'] -= floor($arguments['degrees'] / 360) * 360;

    // Validate or set background color argument.
    if (!empty($arguments['background'])) {

      // Validate the background color: Color::hexToRgb does so for us.
      $background = Color::hexToRgb($arguments['background']) + array(
        'alpha' => 0,
      );
    }
    else {

      // Background color is not specified: use transparent white as background.
      $background = array(
        'red' => 255,
        'green' => 255,
        'blue' => 255,
        'alpha' => 127,
      );
    }

    // Store the color index for the background as that is what GD uses.
    $arguments['background_idx'] = imagecolorallocatealpha($this
      ->getToolkit()
      ->getResource(), $background['red'], $background['green'], $background['blue'], $background['alpha']);
    if ($this
      ->getToolkit()
      ->getType() === IMAGETYPE_GIF) {

      // GIF does not work with a transparency channel, but can define 1 color
      // in its palette to act as transparent.
      // Get the current transparent color, if any.
      $gif_transparent_id = imagecolortransparent($this
        ->getToolkit()
        ->getResource());
      if ($gif_transparent_id !== -1) {

        // The gif already has a transparent color set: remember it to set it on
        // the rotated image as well.
        $arguments['gif_transparent_color'] = imagecolorsforindex($this
          ->getToolkit()
          ->getResource(), $gif_transparent_id);
        if ($background['alpha'] >= 127) {

          // We want a transparent background: use the color already set to act
          // as transparent, as background.
          $arguments['background_idx'] = $gif_transparent_id;
        }
      }
      else {

        // The gif does not currently have a transparent color set.
        if ($background['alpha'] >= 127) {

          // But as the background is transparent, it should get one.
          $arguments['gif_transparent_color'] = $background;
        }
      }
    }
    return $arguments;
  }

  /**
   * {@inheritdoc}
   */
  protected function execute(array $arguments) {

    // PHP installations using non-bundled GD do not have imagerotate.
    if (!function_exists('imagerotate')) {
      $this->logger
        ->notice('The image %file could not be rotated because the imagerotate() function is not available in this PHP installation.', array(
        '%file' => $this
          ->getToolkit()
          ->getSource(),
      ));
      return FALSE;
    }

    // Stores the original GD resource.
    $original_res = $this
      ->getToolkit()
      ->getResource();
    if ($new_res = imagerotate($this
      ->getToolkit()
      ->getResource(), 360 - $arguments['degrees'], $arguments['background_idx'])) {
      $this
        ->getToolkit()
        ->setResource($new_res);
      imagedestroy($original_res);

      // GIFs need to reassign the transparent color after performing the
      // rotate, but only do so, if the image already had transparency of its
      // own, or the rotate added a transparent background.
      if (!empty($arguments['gif_transparent_color'])) {
        $transparent_idx = imagecolorexactalpha($this
          ->getToolkit()
          ->getResource(), $arguments['gif_transparent_color']['red'], $arguments['gif_transparent_color']['green'], $arguments['gif_transparent_color']['blue'], $arguments['gif_transparent_color']['alpha']);
        imagecolortransparent($this
          ->getToolkit()
          ->getResource(), $transparent_idx);
      }
      return TRUE;
    }
    return FALSE;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
DependencySerializationTrait::$_serviceIds protected property An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep public function 1
DependencySerializationTrait::__wakeup public function 2
GDImageToolkitOperationBase::getToolkit protected function The correctly typed image toolkit for GD operations. Overrides ImageToolkitOperationBase::getToolkit
ImageToolkitOperationBase::$logger protected property A logger instance.
ImageToolkitOperationBase::$toolkit protected property The image toolkit.
ImageToolkitOperationBase::apply final public function Applies a toolkit specific operation to an image. Overrides ImageToolkitOperationInterface::apply
ImageToolkitOperationBase::prepareArguments protected function Checks if required arguments are passed in and adds defaults for non passed in optional arguments.
ImageToolkitOperationBase::__construct public function Constructs an image toolkit operation plugin. Overrides PluginBase::__construct
PluginBase::$configuration protected property Configuration information passed into the plugin. 2
PluginBase::$pluginDefinition protected property The plugin implementation definition.
PluginBase::$pluginId protected property The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR constant A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::getBaseId public function Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId public function Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition public function Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition
PluginBase::getPluginId public function Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
Rotate::arguments protected function Returns the definition of the operation arguments. Overrides ImageToolkitOperationBase::arguments
Rotate::execute protected function Performs the actual manipulation on the image. Overrides ImageToolkitOperationBase::execute
Rotate::validateArguments protected function Validates the arguments. Overrides ImageToolkitOperationBase::validateArguments
StringTranslationTrait::$stringTranslation protected property The string translation service.
StringTranslationTrait::formatPlural protected function Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals protected function Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation protected function Gets the string translation service.
StringTranslationTrait::setStringTranslation public function Sets the string translation service to use. 2
StringTranslationTrait::t protected function Translates a string to the current language or to a given language.