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<?php
namespace Drupal\image_effects\Plugin\ImageEffect;
use Drupal\Core\Image\ImageInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\image\ConfigurableImageEffectBase;
class ConvolutionSharpenImageEffect extends ConfigurableImageEffectBase implements ContainerFactoryPluginInterface {
public function defaultConfiguration() {
return [
'level' => 10,
] + parent::defaultConfiguration();
}
public function getSummary() {
return [
'#theme' => 'image_effects_convolution_sharpen_summary',
'#data' => $this->configuration,
] + parent::getSummary();
}
public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
$form['level'] = [
'#type' => 'number',
'#title' => $this
->t('Sharpen level'),
'#description' => $this
->t('Typically 1 - 50.'),
'#default_value' => $this->configuration['level'],
'#required' => TRUE,
'#allow_negative' => FALSE,
];
return $form;
}
public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
parent::submitConfigurationForm($form, $form_state);
$this->configuration['level'] = $form_state
->getValue('level');
}
public function applyEffect(ImageInterface $image) {
$sharpenlevel = $this->configuration['level'] / 100;
$kernel = [
[
-$sharpenlevel,
-$sharpenlevel,
-$sharpenlevel,
],
[
-$sharpenlevel,
8 * $sharpenlevel + 1,
-$sharpenlevel,
],
[
-$sharpenlevel,
-$sharpenlevel,
-$sharpenlevel,
],
];
return $image
->apply('convolution', [
'kernel' => $kernel,
'divisor' => 1,
'offset' => 0,
]);
}
}