function hook_image_effect_info

Define information about image effects provided by a module.

This hook enables modules to define image manipulation effects for use with an image style.

Return value

An array of image effects. This array is keyed on the machine-readable: effect name. Each effect is defined as an associative array containing the following items:

• "label": The human-readable name of the effect.
• "effect callback": The function to call to perform this image effect.
• "dimensions passthrough": (optional) Set this item if the effect doesn't change the dimensions of the image.
• "dimensions callback": (optional) The function to call to transform dimensions for this effect.
• "help": (optional) A brief description of the effect that will be shown when adding or configuring this image effect.
• "form callback": (optional) The name of a function that will return a $form array providing a configuration form for this image effect.
• "summary theme": (optional) The name of a theme function that will output a summary of this image effect's configuration.

See also

hook_image_effect_info_alter()

Related topics

File

core/modules/image/image.api.php, line 37

Hooks related to image styles and effects.

Code

function hook_image_effect_info() {
  $effects = array();

  $effects['my_module_resize'] = array(
    'label' => t('Resize'),
    'help' => t('Resize an image to an exact set of dimensions, ignoring aspect ratio.'),
    'effect callback' => 'my_module_resize_effect',
    'dimensions callback' => 'my_module_resize_dimensions',
    'form callback' => 'my_module_resize_form',
    'summary theme' => 'my_module_resize_summary',
  );

  return $effects;
}