--- /dev/null
+<?php
+
+namespace Drupal\imagemagick\Plugin\ImageToolkit\Operation\imagemagick;
+
+/**
+ * Defines imagemagick Crop operation.
+ *
+ * @ImageToolkitOperation(
+ * id = "imagemagick_crop",
+ * toolkit = "imagemagick",
+ * operation = "crop",
+ * label = @Translation("Crop"),
+ * description = @Translation("Crops an image to a rectangle specified by the given dimensions.")
+ * )
+ */
+class Crop extends ImagemagickImageToolkitOperationBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function arguments() {
+ return [
+ 'x' => [
+ 'description' => 'The starting x offset at which to start the crop, in pixels',
+ ],
+ 'y' => [
+ 'description' => 'The starting y offset at which to start the crop, in pixels',
+ ],
+ 'width' => [
+ 'description' => 'The width of the cropped area, in pixels',
+ 'required' => FALSE,
+ 'default' => NULL,
+ ],
+ 'height' => [
+ 'description' => 'The height of the cropped area, in pixels',
+ 'required' => FALSE,
+ 'default' => NULL,
+ ],
+ ];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ 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 'crop' operation");
+ }
+
+ // Preserve aspect.
+ $aspect = $this->getToolkit()->getHeight() / $this->getToolkit()->getWidth();
+ $arguments['height'] = empty($arguments['height']) ? $arguments['width'] * $aspect : $arguments['height'];
+ $arguments['width'] = empty($arguments['width']) ? $arguments['height'] / $aspect : $arguments['width'];
+
+ // Assure integers for all arguments.
+ foreach (['x', 'y', 'width', 'height'] as $key) {
+ $arguments[$key] = (int) round($arguments[$key]);
+ }
+
+ // Fail when width or height are 0 or negative.
+ if ($arguments['width'] <= 0) {
+ throw new \InvalidArgumentException("Invalid width ('{$arguments['width']}') specified for the image 'crop' operation");
+ }
+ if ($arguments['height'] <= 0) {
+ throw new \InvalidArgumentException("Invalid height ('{$arguments['height']}') specified for the image 'crop' operation");
+ }
+
+ return $arguments;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function execute(array $arguments) {
+ // Even though the crop effect in Drupal core does not allow for negative
+ // offsets, ImageMagick supports them. Also note: if $x and $y are set to
+ // NULL then crop will create tiled images so we convert these to ints.
+ $this->getToolkit()->addArgument(sprintf('-crop %dx%d%+d%+d!', $arguments['width'], $arguments['height'], $arguments['x'], $arguments['y']));
+ $this->getToolkit()->setWidth($arguments['width'])->setHeight($arguments['height']);
+ return TRUE;
+ }
+
+}