Display one random image, but only if landscape

ok, following the comments:

//from https://stackoverflow.com/questions/37537577/wordpress-query-by-attachment-meta-image-size

add_filter('wp_generate_attachment_metadata', 'add_metac', 10, 2);


function add_metac($meta, $id){

update_post_meta($id, 'height', (int) $meta['height']);
update_post_meta($id, 'width', (int) $meta['width']);
update_post_meta($id, 'ratio', round ($meta['width']  / $meta['height'] , 2 ));
return $meta;

}

at this point you will have, for the newly uploaded images, in the postmeta table all the information

and a ratio >1 = horizontal

EDITED some typo and completed with loop

function stack_309636_get_horizontal_bg( $width=900 , $ratio=1 ){
  $types = array( 'image/jpeg', 'image/gif', 'image/png');
  $args= array(
    'post_type'         => 'attachment',
    'post_status'    => 'inherit',
    'posts_per_page' =>   1,
    'orderby'      =>'rand',
    'post_mime_type'    => $types,
    'meta_query' => array(
        'relation' => 'AND', 
        array(
                'key'     => 'width',
                'value'   => $width, //the minimum required
                //'type'    => 'numeric',
                'compare' => '>',
        ),
        array(
                'key'     => 'ratio',
                'value'   => $ratio,  //eventually 1.5 or higher
                //'type'    => 'numeric',
                'compare' => '>',
        ),
    )

  );

  $query= new WP_Query($args);

  if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();
        $img = wp_get_attachment_image_src( $query->post->ID,'full');                            
        $return=$img[0];
        break;
      }
  }
  else 
    $return="your_default_image_url"; // in case no images match 
  wp_reset_query();

  return $return;
}

echo stack_309636_get_horizontal_bg(1200, 1.5);

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