image_filter_keyword($value, $current_pixels, $new_pixels)
Accepts a keyword (center, top, left, etc) and returns it as a pixel offset.
$value:
$current_pixels:
$new_pixels:
function image_filter_keyword($value, $current_pixels, $new_pixels) { switch ($value) { case 'top': case 'left': return 0; case 'bottom': case 'right': return $current_pixels - $new_pixels; case 'center': return $current_pixels / 2 - $new_pixels / 2; } return $value; }
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https://api.drupal.org/api/drupal/core!modules!image!image.module/function/image_filter_keyword/8.1.x