function pdf_to_image_generate_page in PDF to ImageField 7.3

Same name and namespace in other branches

1. 7.2 pdf_to_image.module \pdf_to_image_generate_page()

Generate a single page for the given pdf file.

Return value

array File definition, registered in the DB.

2 calls to pdf_to_image_generate_page()

pdf_to_image_generate_process in ./pdf_to_image.module

Processing pdf file creation.

pdf_to_image_generate_process_page in ./pdf_to_image.module

Generate a single page (of the given index) inside a batch process.

File

./pdf_to_image.module, line 535

Generates thumbnail image(s) from an uploaded PDF.

Code

function pdf_to_image_generate_page($params, $page_number = 0) {
  $source_file = drupal_realpath($params['pdf']['file']->uri);
  if (!file_exists($source_file)) {
    watchdog('pdf_to_image', 'Invalid file given to convert. Could not read %file (%source_file)', array(
      '%file' => $params['pdf']['file']->uri,
      '%source_file' => $source_file,
    ), WATCHDOG_ERROR);
    return NULL;
  }
  $density = "-density " . $params['pdf']['instance']['widget']['settings']['pdf_to_image']['density'];
  $extra_args = isset($params['pdf']['instance']['widget']['settings']['pdf_to_image']['extra_args']) ? $params['pdf']['instance']['widget']['settings']['pdf_to_image']['extra_args'] : "";
  $format = isset($params['pdf']['instance']['widget']['settings']['pdf_to_image']['target_format']) ? $params['pdf']['instance']['widget']['settings']['pdf_to_image']['target_format'] : "jpg";

  // We need to know both the uri and realpath versions of the paths we want to
  // work with.
  $image_dir_uri = file_stream_wrapper_uri_normalize($params['image']['field']['settings']['uri_scheme'] . '://' . $params['image']['instance']['settings']['file_directory']);
  file_prepare_directory($image_dir_uri, FILE_CREATE_DIRECTORY);
  if (!empty($params['image']['instance']['settings']['file_directory'])) {
    $image_dir_uri .= '/';
  }
  $image_uri = $image_dir_uri . $params['pdf']['file']->fid . "-" . $page_number . '.' . $format;
  $image_realpath = drupal_realpath($image_uri);
  if (empty($image_uri)) {
    watchdog('pdf_to_image', 'Failed to calculate a destination filename for conversion', array(), WATCHDOG_ERROR);
    return FALSE;
  }

  // Check to see if the target image file already exists, is registered in the
  // database. Why?
  $query = db_select('file_managed', 'f')
    ->fields('f', array(
    'fid',
  ))
    ->condition('uri', $image_uri)
    ->execute()
    ->fetchCol();
  if (!empty($query)) {
    $file = file_load(array_shift($query));
    watchdog('pdf_to_image', 'PDF preview %image already exists. Re-attaching it.', array(
      '%image' => $image_uri,
    ), WATCHDOG_INFO);
    return $file;
  }
  watchdog('pdf_to_image', 'Converting PDF: %file page %page_number: to image: %image', array(
    '%file' => $params['pdf']['file']->uri,
    '%page_number' => $page_number,
    '%image' => $image_uri,
  ), WATCHDOG_INFO);
  pdf_to_image_convert_exec($source_file . '[' . $page_number . ']', $image_realpath, array(), array(
    $density,
    $extra_args,
  ));
  if (file_exists($image_realpath)) {
    watchdog('pdf_to_image', 'PDF preview %image created', array(
      '%image' => $image_uri,
    ), WATCHDOG_INFO);
    global $user;
    $file = (object) array(
      'uid' => $user->uid,
      'filename' => basename($image_uri),
      'uri' => $image_uri,
      'filemime' => file_get_mimetype($image_uri),
      'filesize' => @filesize($image_uri),
      'timestamp' => REQUEST_TIME,
      'status' => FALSE,
      'is_new' => TRUE,
    );
    file_save($file);
    return $file;
  }
  watchdog('pdf_to_image', 'Failed to generate image. Expected result at %image_realpath but it was not produced.', array(
    '%image_realpath' => $image_realpath,
  ), WATCHDOG_ERROR);
  return FALSE;
}