function _image_build_derivatives in Image 6

Same name and namespace in other branches

1. 5.2 image.module \_image_build_derivatives()
2. 5 image.module \_image_build_derivatives()

Generate image derivatives.

Parameters

$node: The node.

$temp: Boolean indicating if the derivatives should be saved to the temp directory.

Return value

New array of images for the node.

2 calls to _image_build_derivatives()

image_form_validate in ./image.module

image_update in ./image.module

Implementation of hook_update().

File

./image.module, line 837

Code

function _image_build_derivatives($node, $temp = FALSE) {
  $original_path = file_create_path($node->images[IMAGE_ORIGINAL]);

  // Figure out which sizes we need to generate.
  $all_sizes = image_get_sizes();
  $needed_sizes = image_get_derivative_sizes($original_path);
  $unneeded_sizes = array_diff(array_keys($all_sizes), array_keys($needed_sizes));

  // Images that don't need a derivative image get set to the original.
  $images[IMAGE_ORIGINAL] = $original_path;
  foreach ($unneeded_sizes as $key) {
    $images[$key] = $original_path;
  }

  // Resize for the necessary sizes.
  $image_info = image_get_info($original_path);
  foreach ($needed_sizes as $key => $size) {
    $destination = _image_filename($original_path, $key, $temp);
    $status = FALSE;
    switch ($size['operation']) {

      // Depending on the operation, the image will be scaled or resized & cropped
      case 'scale':
        $status = image_scale($original_path, $destination, $size['width'], $size['height']);
        break;
      case 'scale_crop':
        $status = image_scale_and_crop($original_path, $destination, $size['width'], $size['height']);
        break;
    }
    if (!$status) {
      drupal_set_message(t('Unable to create scaled %label image.', array(
        '%label' => $size['label'],
      )), 'error');
      return FALSE;
    }

    // Set standard file permissions for webserver-generated files
    @chmod($destination, 0664);
    $images[$key] = $destination;
    module_invoke_all('image_alter', $node, $destination, $key);
  }
  return $images;
}