class-wp-image-editor-gd.php

<?php
/**
 * WordPress GD Image Editor
 *
 * @package WordPress
 * @subpackage Image_Editor
 */

/**
 * WordPress Image Editor Class for Image Manipulation through GD
 *
 * @since 3.5.0
 * @package WordPress
 * @subpackage Image_Editor
 * @uses WP_Image_Editor Extends class
 */
class WP_Image_Editor_GD extends WP_Image_Editor {

	protected $image = false; // GD Resource

	public function __destruct() {
		if ( $this->image ) {
			// we don't need the original in memory anymore
			imagedestroy( $this->image );
		}
	}

	/**
	 * Checks to see if current environment supports GD.
	 *
	 * @since 3.5.0
	 * @access public
	 *
	 * @return boolean
	 */
	public static function test( $args = array() ) {
		if ( ! extension_loaded('gd') || ! function_exists('gd_info') )
			return false;

		// On some setups GD library does not provide imagerotate() - Ticket #11536
		if ( isset( $args['methods'] ) &&
			 in_array( 'rotate', $args['methods'] ) &&
			 ! function_exists('imagerotate') ){

				return false;
		}

		return true;
	}

	/**
	 * Checks to see if editor supports the mime-type specified.
	 *
	 * @since 3.5.0
	 * @access public
	 *
	 * @param string $mime_type
	 * @return boolean
	 */
	public static function supports_mime_type( $mime_type ) {
		$image_types = imagetypes();
		switch( $mime_type ) {
			case 'image/jpeg':
				return ($image_types & IMG_JPG) != 0;
			case 'image/png':
				return ($image_types & IMG_PNG) != 0;
			case 'image/gif':
				return ($image_types & IMG_GIF) != 0;
		}