function _exif_orientation_rotate in EXIF Orientation 8

Same name and namespace in other branches

1. 7 exif_orientation.module \_exif_orientation_rotate()

Rotates an image to its EXIF Orientation.

iPhone 4 and up save all images in landscape, relying on EXIF data to set the orientation properly. This does not always translate well in the browser or other devices. @link: http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling...

2 calls to _exif_orientation_rotate()

exif_orientation_file_presave in ./exif_orientation.module

Implements hook_file_presave().

exif_orientation_validate_image_rotation in ./exif_orientation.module

Ensures that image orientation is according to exif data.

File

./exif_orientation.module, line 58

Module file for EXIF Orientation.

Code

function _exif_orientation_rotate($file) {
  if (function_exists('exif_read_data') && $file
    ->getMimeType() == 'image/jpeg') {
    $file_exif = @exif_read_data(\Drupal::service('file_system')
      ->realpath($file
      ->getFileUri()));

    // Ensure that the Orientation key|value exists, otherwise leave.
    if (!is_array($file_exif) || !isset($file_exif['Orientation'])) {
      return;
    }

    // Orientation numbers and corresponding degrees.
    // @note: Odd numbers are flipped images, would need different process.
    switch ($file_exif['Orientation']) {
      case 3:
        $degrees = 180;
        break;
      case 6:
        $degrees = 90;
        break;
      case 8:
        $degrees = 270;
        break;
      default:
        $degrees = 0;
    }
    if ($degrees > 0) {
      $image = \Drupal::service('image.factory')
        ->get($file
        ->getFileUri());
      if ($image
        ->rotate($degrees)) {
        $image
          ->save();
      }
    }
  }
}