function _exif_orientation_rotate in EXIF Orientation 7

Same name and namespace in other branches

1. 8 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_callback in ./exif_orientation.module

Image validator which rotates the image.

File

./exif_orientation.module, line 72

Module file for EXIF Orientation

Code

function _exif_orientation_rotate($file) {
  if (function_exists('exif_read_data') && $file->filemime == 'image/jpeg') {
    $file_exif = @exif_read_data(drupal_realpath($file->uri));

    // 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) {

      // Load the image object for manipulation
      $file_image = image_load(drupal_realpath($file->uri));
      if (image_rotate($file_image, $degrees, 0xffffff)) {
        image_save($file_image);
      }
    }
  }
}