<?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

	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;

		}

		return false;

	}

	/**

	 * Loads image from $this->file into new GD Resource.

	 *

	 * @since 3.5.0

	 * @access protected

	 *

	 * @return boolean|\WP_Error

	 */

	public function load() {

		if ( $this->image )

			return true;

		if ( ! is_file( $this->file ) && ! preg_match( '|^https?://|', $this->file ) )

			return new WP_Error( 'error_loading_image', __('File doesn’t exist?'), $this->file );

		// Set artificially high because GD uses uncompressed images in memory

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

		$this->image = @imagecreatefromstring( file_get_contents( $this->file ) );

		if ( ! is_resource( $this->image ) )

			return new WP_Error( 'invalid_image', __('File is not an image.'), $this->file );

		$size = @getimagesize( $this->file );

		if ( ! $size )

			return new WP_Error( 'invalid_image', __('Could not read image size.'), $this->file );

		if ( function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {

			imagealphablending( $this->image, false );

			imagesavealpha( $this->image, true );

		}

		$this->update_size( $size[0], $size[1] );

		$this->mime_type = $size['mime'];

		return true;

	}

	/**

	 * Sets or updates current image size.

	 *

	 * @since 3.5.0

	 * @access protected

	 *

	 * @param int $width

	 * @param int $height

	 */

	protected function update_size( $width = false, $height = false ) {

		if ( ! $width )

			$width = imagesx( $this->image );

		if ( ! $height )

			$height = imagesy( $this->image );

		return parent::update_size( $width, $height );

	}

	/**

	 * Resizes current image.

	 * Wraps _resize, since _resize returns a GD Resource.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param int $max_w

	 * @param int $max_h

	 * @param boolean $crop

	 * @return boolean|WP_Error

	 */

	public function resize( $max_w, $max_h, $crop = false ) {

		if ( ( $this->size['width'] == $max_w ) && ( $this->size['height'] == $max_h ) )

			return true;

		$resized = $this->_resize( $max_w, $max_h, $crop );

		if ( is_resource( $resized ) ) {

			imagedestroy( $this->image );

			$this->image = $resized;

			return true;

		} elseif ( is_wp_error( $resized ) )

			return $resized;

		return new WP_Error( 'image_resize_error', __('Image resize failed.'), $this->file );

	}

	protected function _resize( $max_w, $max_h, $crop = false ) {

		$dims = image_resize_dimensions( $this->size['width'], $this->size['height'], $max_w, $max_h, $crop );

		if ( ! $dims ) {

			return new WP_Error( 'error_getting_dimensions', __('Could not calculate resized image dimensions'), $this->file );

		}

		list( $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ) = $dims;

		$resized = wp_imagecreatetruecolor( $dst_w, $dst_h );

		imagecopyresampled( $resized, $this->image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );

		if ( is_resource( $resized ) ) {

			$this->update_size( $dst_w, $dst_h );

			return $resized;

		}

		return new WP_Error( 'image_resize_error', __('Image resize failed.'), $this->file );

	}

	/**

	 * Resize multiple images from a single source.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param array $sizes {

	 *     An array of image size arrays. Default sizes are 'small', 'medium', 'large'.

	 *

	 *     @type array $size {

	 *         @type int  $width  Image width.

	 *         @type int  $height Image height.

	 *         @type bool $crop   Optional. Whether to crop the image. Default false.

	 *     }

	 * }

	 * @return array An array of resized images metadata by size.

	 */

	public function multi_resize( $sizes ) {

		$metadata = array();

		$orig_size = $this->size;

		foreach ( $sizes as $size => $size_data ) {

			if ( ! ( isset( $size_data['width'] ) && isset( $size_data['height'] ) ) )

				continue;

			if ( ! isset( $size_data['crop'] ) )

				$size_data['crop'] = false;

			$image = $this->_resize( $size_data['width'], $size_data['height'], $size_data['crop'] );

			if( ! is_wp_error( $image ) ) {

				$resized = $this->_save( $image );

				imagedestroy( $image );

				if ( ! is_wp_error( $resized ) && $resized ) {

					unset( $resized['path'] );

					$metadata[$size] = $resized;

				}

			}

			$this->size = $orig_size;

		}

		return $metadata;

	}

	/**

	 * Crops Image.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param string|int $src The source file or Attachment ID.

	 * @param int $src_x The start x position to crop from.

	 * @param int $src_y The start y position to crop from.

	 * @param int $src_w The width to crop.

	 * @param int $src_h The height to crop.

	 * @param int $dst_w Optional. The destination width.

	 * @param int $dst_h Optional. The destination height.

	 * @param boolean $src_abs Optional. If the source crop points are absolute.

	 * @return boolean|WP_Error

	 */

	public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false ) {

		// If destination width/height isn't specified, use same as

		// width/height from source.

		if ( ! $dst_w )

			$dst_w = $src_w;

		if ( ! $dst_h )

			$dst_h = $src_h;

		$dst = wp_imagecreatetruecolor( $dst_w, $dst_h );

		if ( $src_abs ) {

			$src_w -= $src_x;

			$src_h -= $src_y;

		}

		if ( function_exists( 'imageantialias' ) )

			imageantialias( $dst, true );

		imagecopyresampled( $dst, $this->image, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );

		if ( is_resource( $dst ) ) {

			imagedestroy( $this->image );

			$this->image = $dst;

			$this->update_size();

			return true;

		}

		return new WP_Error( 'image_crop_error', __('Image crop failed.'), $this->file );

	}

	/**

	 * Rotates current image counter-clockwise by $angle.

	 * Ported from image-edit.php

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param float $angle

	 * @return boolean|WP_Error

	 */

	public function rotate( $angle ) {

		if ( function_exists('imagerotate') ) {

			$rotated = imagerotate( $this->image, $angle, 0 );

			if ( is_resource( $rotated ) ) {

				imagedestroy( $this->image );

				$this->image = $rotated;

				$this->update_size();

				return true;

			}

		}

		return new WP_Error( 'image_rotate_error', __('Image rotate failed.'), $this->file );

	}

	/**

	 * Flips current image.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param boolean $horz Flip along Horizontal Axis

	 * @param boolean $vert Flip along Vertical Axis

	 * @returns boolean|WP_Error

	 */

	public function flip( $horz, $vert ) {

		$w = $this->size['width'];

		$h = $this->size['height'];

		$dst = wp_imagecreatetruecolor( $w, $h );

		if ( is_resource( $dst ) ) {

			$sx = $vert ? ($w - 1) : 0;

			$sy = $horz ? ($h - 1) : 0;

			$sw = $vert ? -$w : $w;

			$sh = $horz ? -$h : $h;

			if ( imagecopyresampled( $dst, $this->image, 0, 0, $sx, $sy, $w, $h, $sw, $sh ) ) {

				imagedestroy( $this->image );

				$this->image = $dst;

				return true;

			}

		}

		return new WP_Error( 'image_flip_error', __('Image flip failed.'), $this->file );

	}

	/**

	 * Saves current in-memory image to file.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param string $destfilename

	 * @param string $mime_type

	 * @return array|WP_Error {'path'=>string, 'file'=>string, 'width'=>int, 'height'=>int, 'mime-type'=>string}

	 */

	public function save( $filename = null, $mime_type = null ) {

		$saved = $this->_save( $this->image, $filename, $mime_type );

		if ( ! is_wp_error( $saved ) ) {

			$this->file = $saved['path'];

			$this->mime_type = $saved['mime-type'];

		}

		return $saved;

	}

	protected function _save( $image, $filename = null, $mime_type = null ) {

		list( $filename, $extension, $mime_type ) = $this->get_output_format( $filename, $mime_type );

		if ( ! $filename )

			$filename = $this->generate_filename( null, null, $extension );

		if ( 'image/gif' == $mime_type ) {

			if ( ! $this->make_image( $filename, 'imagegif', array( $image, $filename ) ) )

				return new WP_Error( 'image_save_error', __('Image Editor Save Failed') );

		}

		elseif ( 'image/png' == $mime_type ) {

			// convert from full colors to index colors, like original PNG.

			if ( function_exists('imageistruecolor') && ! imageistruecolor( $image ) )

				imagetruecolortopalette( $image, false, imagecolorstotal( $image ) );

			if ( ! $this->make_image( $filename, 'imagepng', array( $image, $filename ) ) )

				return new WP_Error( 'image_save_error', __('Image Editor Save Failed') );

		}

		elseif ( 'image/jpeg' == $mime_type ) {

			if ( ! $this->make_image( $filename, 'imagejpeg', array( $image, $filename, apply_filters( 'jpeg_quality', $this->quality, 'image_resize' ) ) ) )

				return new WP_Error( 'image_save_error', __('Image Editor Save Failed') );

		}

		else {

			return new WP_Error( 'image_save_error', __('Image Editor Save Failed') );

		}

		// Set correct file permissions

		$stat = stat( dirname( $filename ) );

		$perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits

		@ chmod( $filename, $perms );

		return array(

			'path' => $filename,

			'file' => wp_basename( apply_filters( 'image_make_intermediate_size', $filename ) ),

			'width' => $this->size['width'],

			'height' => $this->size['height'],

			'mime-type'=> $mime_type,

		);

	}

	/**

	 * Returns stream of current image.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param string $mime_type

	 */

	public function stream( $mime_type = null ) {

		list( $filename, $extension, $mime_type ) = $this->get_output_format( null, $mime_type );

		switch ( $mime_type ) {

			case 'image/png':

				header( 'Content-Type: image/png' );

				return imagepng( $this->image );

			case 'image/gif':

				header( 'Content-Type: image/gif' );

				return imagegif( $this->image );

			default:

				header( 'Content-Type: image/jpeg' );

				return imagejpeg( $this->image, null, $this->quality );

		}

	}

	/**

	 * Either calls editor's save function or handles file as a stream.

	 *

	 * @since 3.5.0

	 * @access protected

	 *

	 * @param string|stream $filename

	 * @param callable $function