--- /dev/null
+<?php
+
+namespace Drupal\image\Plugin\ImageEffect;
+
+use Drupal\Component\Utility\Image;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Image\ImageInterface;
+
+/**
+ * Scales an image resource.
+ *
+ * @ImageEffect(
+ * id = "image_scale",
+ * label = @Translation("Scale"),
+ * description = @Translation("Scaling will maintain the aspect-ratio of the original image. If only a single dimension is specified, the other dimension will be calculated.")
+ * )
+ */
+class ScaleImageEffect extends ResizeImageEffect {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function applyEffect(ImageInterface $image) {
+ if (!$image->scale($this->configuration['width'], $this->configuration['height'], $this->configuration['upscale'])) {
+ $this->logger->error('Image scale failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', ['%toolkit' => $image->getToolkitId(), '%path' => $image->getSource(), '%mimetype' => $image->getMimeType(), '%dimensions' => $image->getWidth() . 'x' . $image->getHeight()]);
+ return FALSE;
+ }
+ return TRUE;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function transformDimensions(array &$dimensions, $uri) {
+ if ($dimensions['width'] && $dimensions['height']) {
+ Image::scaleDimensions($dimensions, $this->configuration['width'], $this->configuration['height'], $this->configuration['upscale']);
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getSummary() {
+ $summary = [
+ '#theme' => 'image_scale_summary',
+ '#data' => $this->configuration,
+ ];
+ $summary += parent::getSummary();
+
+ return $summary;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function defaultConfiguration() {
+ return parent::defaultConfiguration() + [
+ 'upscale' => FALSE,
+ ];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+ $form = parent::buildConfigurationForm($form, $form_state);
+ $form['width']['#required'] = FALSE;
+ $form['height']['#required'] = FALSE;
+ $form['upscale'] = [
+ '#type' => 'checkbox',
+ '#default_value' => $this->configuration['upscale'],
+ '#title' => t('Allow Upscaling'),
+ '#description' => t('Let scale make images larger than their original size.'),
+ ];
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
+ parent::validateConfigurationForm($form, $form_state);
+ if ($form_state->isValueEmpty('width') && $form_state->isValueEmpty('height')) {
+ $form_state->setErrorByName('data', $this->t('Width and height can not both be blank.'));
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+ parent::submitConfigurationForm($form, $form_state);
+
+ $this->configuration['upscale'] = $form_state->getValue('upscale');
+ }
+
+}