Mask.php in Image Effects 8

Namespace

Drupal\image_effects\Plugin\ImageToolkit\Operation\gd

File

src/Plugin/ImageToolkit/Operation/gd/Mask.php

<?php

namespace Drupal\image_effects\Plugin\ImageToolkit\Operation\gd;

use Drupal\system\Plugin\ImageToolkit\Operation\gd\GDImageToolkitOperationBase;
use Drupal\image_effects\Plugin\ImageToolkit\Operation\MaskTrait;

/**
 * Defines GD Mask operation.
 *
 * @ImageToolkitOperation(
 *   id = "image_effects_gd_mask",
 *   toolkit = "gd",
 *   operation = "mask",
 *   label = @Translation("Mask"),
 *   description = @Translation("Applies a mask to the source image.")
 * )
 */
class Mask extends GDImageToolkitOperationBase {
  use MaskTrait;

  /**
   * {@inheritdoc}
   */
  protected function execute(array $arguments) {
    $mask = $arguments['mask_image'];
    $x_offset = $arguments['x_offset'];
    $y_offset = $arguments['y_offset'];

    // Resize mask if needed.
    if ($arguments['mask_width'] || $arguments['mask_height']) {
      $mask
        ->apply('resize', [
        'width' => $arguments['mask_width'],
        'height' => $arguments['mask_height'],
      ]);
    }

    // Preserves original resource, to be destroyed upon success.
    $original_resource = $this
      ->getToolkit()
      ->getResource();

    // Prepare a new image.
    $data = [
      'width' => $this
        ->getToolkit()
        ->getWidth(),
      'height' => $this
        ->getToolkit()
        ->getHeight(),
      'extension' => image_type_to_extension($this
        ->getToolkit()
        ->getType(), FALSE),
      'transparent_color' => $this
        ->getToolkit()
        ->getTransparentColor(),
      'is_temp' => TRUE,
    ];
    if (!$this
      ->getToolkit()
      ->apply('create_new', $data)) {

      // In case of failure, destroy the temporary resource and restore
      // the original one.
      imagedestroy($this
        ->getToolkit()
        ->getResource());
      $this
        ->getToolkit()
        ->setResource($original_resource);
      return FALSE;
    }

    // Force a transparent color fill to prevent JPEG to end up as a white
    // mask, while in memory.
    imagefill($this
      ->getToolkit()
      ->getResource(), 0, 0, imagecolorallocatealpha($this
      ->getToolkit()
      ->getResource(), 0, 0, 0, 127));

    // Perform pixel-based alpha map application.
    for ($x = 0; $x < $mask
      ->getToolkit()
      ->getWidth(); $x++) {
      for ($y = 0; $y < $mask
        ->getToolkit()
        ->getHeight(); $y++) {

        // Deal with images with mismatched sizes.
        if ($x + $x_offset >= imagesx($original_resource) || $y + $y_offset >= imagesy($original_resource) || $x + $x_offset < 0 || $y + $y_offset < 0) {
          continue;
        }
        else {
          $alpha = imagecolorsforindex($mask
            ->getToolkit()
            ->getResource(), imagecolorat($mask
            ->getToolkit()
            ->getResource(), $x, $y));
          $alpha = 127 - floor($alpha['red'] / 2);
          $color = imagecolorsforindex($this
            ->getToolkit()
            ->getResource(), imagecolorat($original_resource, $x + $x_offset, $y + $y_offset));
          imagesetpixel($this
            ->getToolkit()
            ->getResource(), $x + $x_offset, $y + $y_offset, imagecolorallocatealpha($this
            ->getToolkit()
            ->getResource(), $color['red'], $color['green'], $color['blue'], $alpha));
        }
      }
    }

    // Destroy original picture.
    imagedestroy($original_resource);
    return TRUE;
  }

}

Classes

Name	Description
Mask	Defines GD Mask operation.