stream_preview_image

Source code

function stream_preview_image($post_id) {

	$post = get_post($post_id);

	@ini_set( 'memory_limit', apply_filters( 'admin_memory_limit', WP_MAX_MEMORY_LIMIT ) );

	$img = load_image_to_edit( $post_id, $post->post_mime_type, array(400, 400) );



	if ( !is_resource($img) )

		return false;



	$changes = !empty($_REQUEST['history']) ? json_decode( stripslashes($_REQUEST['history']) ) : null;

	if ( $changes )

		$img = image_edit_apply_changes($img, $changes);



	// scale the image

	$w = imagesx($img);

	$h = imagesy($img);

	$ratio = _image_get_preview_ratio($w, $h);

	$w2 = $w * $ratio;

	$h2 = $h * $ratio;



	$preview = wp_imagecreatetruecolor($w2, $h2);

	imagecopyresampled( $preview, $img, 0, 0, 0, 0, $w2, $h2, $w, $h );

	wp_stream_image($preview, $post->post_mime_type, $post_id);



	imagedestroy($preview);

	imagedestroy($img);

	return true;

}