Loads the definition for an image effect.
The effect definition is a set of core properties for an image effect, not containing any user-settings. The definition defines various functions to call when configuring or executing an image effect. This loader is mostly for internal use within image.module. Use image_effect_load() or entity_load() to get image effects that contain configuration.
$effect: The name of the effect definition to load.
An array containing the image effect definition with the following keys:
function image_effect_definition_load($effect) {
$definitions = image_effect_definitions();
return isset($definitions[$effect]) ? $definitions[$effect] : FALSE;
}