image_style_generate.module

image_style_generate.module

<?php

/**
 * Implements hook_node_insert to generate derivative images for the new inserted node in
 * case they are not generated
 * @param object $node
 */
function image_style_generate_node_insert($node) {
  // REPLACE field_YOUR_IMAGE_FIELD WITH YOUR FIELD IMAGE NAME
  if (isset($node->field_image['und'][0]['uri'])) {
    $image_styles = array('image_style_1', 'image_style_2', 'image_style_3');
    _generate_image_style($image_styles, $node->field_image['und'][0]['uri']);
  }
  if (isset($node->field_vertical_image['und'][0]['uri'])) {
    $image_styles = array('image_style_4', 'image_style_5', 'image_style_6');
    _generate_image_style($image_styles, $node->field_vertical_image['und'][0]['uri']);
  }
  if (is_array($node->field_image_gallery['und']) && !empty($node->field_image_gallery['und'])) {
    $image_styles = array('image_style_1', 'thumbnail', 'image_style_6');
    foreach ($node->field_image_gallery['und'] as $id => $uri) {
      _generate_image_style($image_styles, $node->field_image_gallery['und'][$id]['uri']);
    }
  }
}

/**
 * Implements hook_node_update to generate derivative images for the new updated node in
 * case they are not generated
 * @param object $node
 */
function image_style_generate_node_update($node) {
  // REPLACE field_YOUR_IMAGE_FIELD WITH YOUR FIELD IMAGE NAME
  if (isset($node->field_image['und'][0]['uri'])) {
    $image_styles = array('image_style_1', 'image_style_2', 'image_style_3');
    _generate_image_style($image_styles, $node->field_image['und'][0]['uri']);
  }
  if (isset($node->field_vertical_image['und'][0]['uri'])) {
    $image_styles = array('image_style_4', 'image_style_5', 'image_style_6');
    _generate_image_style($image_styles, $node->field_vertical_image['und'][0]['uri']);
  }
  if (is_array($node->field_image_gallery['und']) && !empty($node->field_image_gallery['und'])) {
    $image_styles = array('image_style_1', 'thumbnail', 'image_style_6');
    foreach ($node->field_image_gallery['und'] as $id => $uri) {
      _generate_image_style($image_styles, $node->field_image_gallery['und'][$id]['uri']);
    }
  }
}

/**
 * Generates the needed image styles by the image uri if they are not already generated
 * @param array $image_styles
 * @param string $image_uri
 */
function _generate_image_style($image_styles, $image_uri) {
  //This should be changed to your image styles names.
  foreach ($image_styles as $style) {
    $derivative_uri = image_style_path($style, $image_uri);
    file_exists($derivative_uri) || image_style_create_derivative(image_style_load($style), $image_uri, $derivative_uri);
  }
}
?>