# 2015-05-04 mes notes à http://jenny.bourdiol.org/content/technique-rwd-des-images-drupal-7-field-formatter-class


/*
 * Implémente hook_theme_registry_alter
 */
function responsiveimages_theme_registry_alter(&$theme_registry) {
   if (isset($theme_registry['image'])) {
    $theme_registry['image']['function'] = 'responsiveimages_image';
  }
  return $theme_registry;
}
 
 /**
 * Surcharge theme_image
 */
function responsiveimages_image($variables) {

    //srcset
    $source = file_create_url($variables['path']);
 
    $srcset = get_srcset_for_image($source);    
    if ($srcset) $variables['attributes']['srcset'] = $srcset;
  
    //sizes 
    if (array_key_exists('class', $variables['attributes'])) {
        
        $classes = explode(" ", $variables['attributes']['class']);

        $sizes = get_sizes_for_image($classes);
        if (strlen($sizes)) $variables['attributes']['sizes'] = $sizes;
    }

    $attributes = $variables['attributes'];

    foreach (array('width', 'height', 'alt', 'title') as $key) {

        if (isset($variables[$key])) {
          $attributes[$key] = $variables[$key];
        }
    }
    return '<img' . drupal_attributes($attributes) . ' />';
}