Wordpress/wp-admin/includes/image-edit.php

<?php
/**
 * WordPress Image Editor
 *
 * @package WordPress
 * @subpackage Administration
 */

function wp_image_editor($post_id, $msg = false) {
	$nonce = wp_create_nonce("image_editor-$post_id");
	$meta = wp_get_attachment_metadata($post_id);
	$thumb = image_get_intermediate_size($post_id, 'thumbnail');
	$sub_sizes = isset($meta['sizes']) && is_array($meta['sizes']);
	$note = '';

	if ( is_array($meta) && isset($meta['width']) )
		$big = max( $meta['width'], $meta['height'] );
	else
		die( __('Image data does not exist. Please re-upload the image.') );

	$sizer = $big > 400 ? 400 / $big : 1;

	$backup_sizes = get_post_meta( $post_id, '_wp_attachment_backup_sizes', true );
	$can_restore = !empty($backup_sizes) && isset($backup_sizes['full-orig'])
		&& $backup_sizes['full-orig']['file'] != basename($meta['file']);

	if ( $msg ) {
		if ( isset($msg->error) )
			$note = "<div class='error'><p>$msg->error</p></div>";
		elseif ( isset($msg->msg) )
			$note = "<div class='updated'><p>$msg->msg</p></div>";
	}

	?>
	<div class="imgedit-wrap">
	<?php echo $note; ?>
	<table id="imgedit-panel-<?php echo $post_id; ?>"><tbody>
	<tr><td>
	<div class="imgedit-menu">
		<div onclick="imageEdit.crop(<?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-crop disabled" title="<?php esc_attr_e( 'Crop' ); ?>"></div><?php

	// On some setups GD library does not provide imagerotate() - Ticket #11536
	if ( wp_image_editor_supports( array( 'mime_type' => get_post_mime_type( $post_id ), 'methods' => array( 'rotate' ) ) ) ) { ?>
		<div class="imgedit-rleft"  onclick="imageEdit.rotate( 90, <?php echo "$post_id, '$nonce'"; ?>, this)" title="<?php esc_attr_e( 'Rotate counter-clockwise' ); ?>"></div>
		<div class="imgedit-rright" onclick="imageEdit.rotate(-90, <?php echo "$post_id, '$nonce'"; ?>, this)" title="<?php esc_attr_e( 'Rotate clockwise' ); ?>"></div>
<?php } else {
		$note_no_rotate = esc_attr__('Image rotation is not supported by your web host.');
?>
	    <div class="imgedit-rleft disabled"  title="<?php echo $note_no_rotate; ?>"></div>
	    <div class="imgedit-rright disabled" title="<?php echo $note_no_rotate; ?>"></div>
<?php } ?>

		<div onclick="imageEdit.flip(1, <?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-flipv" title="<?php esc_attr_e( 'Flip vertically' ); ?>"></div>
		<div onclick="imageEdit.flip(2, <?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-fliph" title="<?php esc_attr_e( 'Flip horizontally' ); ?>"></div>

		<div id="image-undo-<?php echo $post_id; ?>" onclick="imageEdit.undo(<?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-undo disabled" title="<?php esc_attr_e( 'Undo' ); ?>"></div>
		<div id="image-redo-<?php echo $post_id; ?>" onclick="imageEdit.redo(<?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-redo disabled" title="<?php esc_attr_e( 'Redo' ); ?>"></div>
		<br class="clear" />
	</div>

	<input type="hidden" id="imgedit-sizer-<?php echo $post_id; ?>" value="<?php echo $sizer; ?>" />
	<input type="hidden" id="imgedit-minthumb-<?php echo $post_id; ?>" value="<?php echo ( get_option('thumbnail_size_w') . ':' . get_option('thumbnail_size_h') ); ?>" />
	<input type="hidden" id="imgedit-history-<?php echo $post_id; ?>" value="" />
	<input type="hidden" id="imgedit-undone-<?php echo $post_id; ?>" value="0" />
	<input type="hidden" id="imgedit-selection-<?php echo $post_id; ?>" value="" />
	<input type="hidden" id="imgedit-x-<?php echo $post_id; ?>" value="<?php echo $meta['width']; ?>" />
	<input type="hidden" id="imgedit-y-<?php echo $post_id; ?>" value="<?php echo $meta['height']; ?>" />

	<div id="imgedit-crop-<?php echo $post_id; ?>" class="imgedit-crop-wrap">
	<img id="image-preview-<?php echo $post_id; ?>" onload="imageEdit.imgLoaded('<?php echo $post_id; ?>')" src="<?php echo admin_url( 'admin-ajax.php', 'relative' ); ?>?action=imgedit-preview&amp;_ajax_nonce=<?php echo $nonce; ?>&amp;postid=<?php echo $post_id; ?>&amp;rand=<?php echo rand(1, 99999); ?>" />
	</div>

	<div class="imgedit-submit">
		<input type="button" onclick="imageEdit.close(<?php echo $post_id; ?>, 1)" class="button" value="<?php esc_attr_e( 'Cancel' ); ?>" />
		<input type="button" onclick="imageEdit.save(<?php echo "$post_id, '$nonce'"; ?>)" disabled="disabled" class="button-primary imgedit-submit-btn" value="<?php esc_attr_e( 'Save' ); ?>" />
	</div>
	</td>

	<td class="imgedit-settings">
	<div class="imgedit-group">
	<div class="imgedit-group-top">
		<a class="imgedit-help-toggle" onclick="imageEdit.toggleHelp(this);return false;" href="#"><strong><?php _e('Scale Image'); ?></strong></a>
		<div class="imgedit-help">
		<p><?php _e('You can proportionally scale the original image. For best results the scaling should be done before performing any other operations on it like crop, rotate, etc. Note that if you make the image larger it may become fuzzy.'); ?></p>
		<p><?php printf( __('Original dimensions %s'), $meta['width'] . '&times;' . $meta['height'] ); ?></p>
		<div class="imgedit-submit">
		<span class="nowrap"><input type="text" id="imgedit-scale-width-<?php echo $post_id; ?>" onkeyup="imageEdit.scaleChanged(<?php echo $post_id; ?>, 1)" onblur="imageEdit.scaleChanged(<?php echo $post_id; ?>, 1)" style="width:4em;" value="<?php echo $meta['width']; ?>" />&times;<input type="text" id="imgedit-scale-height-<?php echo $post_id; ?>" onkeyup="imageEdit.scaleChanged(<?php echo $post_id; ?>, 0)" onblur="imageEdit.scaleChanged(<?php echo $post_id; ?>, 0)" style="width:4em;" value="<?php echo $meta['height']; ?>" />
		<span class="imgedit-scale-warn" id="imgedit-scale-warn-<?php echo $post_id; ?>">!</span></span>
		<input type="button" onclick="imageEdit.action(<?php echo "$post_id, '$nonce'"; ?>, 'scale')" class="button-primary" value="<?php esc_attr_e( 'Scale' ); ?>" />
		</div>
		</div>
	</div>

<?php if ( $can_restore ) { ?>

	<div class="imgedit-group-top">
		<a class="imgedit-help-toggle" onclick="imageEdit.toggleHelp(this);return false;" href="#"><strong><?php _e('Restore Original Image'); ?></strong></a>
		<div class="imgedit-help">
		<p><?php _e('Discard any changes and restore the original image.');

		if ( !defined('IMAGE_EDIT_OVERWRITE') || !IMAGE_EDIT_OVERWRITE )
			echo ' '.__('Previously edited copies of the image will not be deleted.');

		?></p>
		<div class="imgedit-submit">
		<input type="button" onclick="imageEdit.action(<?php echo "$post_id, '$nonce'"; ?>, 'restore')" class="button-primary" value="<?php esc_attr_e( 'Restore image' ); ?>" <?php echo $can_restore; ?> />
		</div>
		</div>
	</div>

<?php } ?>

	</div>

	<div class="imgedit-group">
	<div class="imgedit-group-top">
		<strong><?php _e('Image Crop'); ?></strong>
		<a class="imgedit-help-toggle" onclick="imageEdit.toggleHelp(this);return false;" href="#"><?php _e('(help)'); ?></a>
		<div class="imgedit-help">
		<p><?php _e('The image can be cropped by clicking on it and dragging to select the desired part. While dragging the dimensions of the selection are displayed below.'); ?></p>

		<p><strong><?php _e('Crop Aspect Ratio'); ?></strong><br />
		<?php _e('You can specify the crop selection aspect ratio then hold down the Shift key while dragging to lock it. The values can be 1:1 (square), 4:3, 16:9, etc. If there is a selection, specifying aspect ratio will set it immediately.'); ?></p>

		<p><strong><?php _e('Crop Selection'); ?></strong><br />
		<?php _e('Once started, the selection can be adjusted by entering new values (in pixels). Note that these values are scaled to approximately match the original image dimensions. The minimum selection size equals the thumbnail size as set in the Media settings.'); ?></p>
		</div>
	</div>

	<p>
		<?php _e('Aspect ratio:'); ?>
		<span  class="nowrap">
		<input type="text" id="imgedit-crop-width-<?php echo $post_id; ?>" onkeyup="imageEdit.setRatioSelection(<?php echo $post_id; ?>, 0, this)" style="width:3em;" />
		:
		<input type="text" id="imgedit-crop-height-<?php echo $post_id; ?>" onkeyup="imageEdit.setRatioSelection(<?php echo $post_id; ?>, 1, this)" style="width:3em;" />
		</span>
	</p>

	<p id="imgedit-crop-sel-<?php echo $post_id; ?>">
		<?php _e('Selection:'); ?>
		<span  class="nowrap">
		<input type="text" id="imgedit-sel-width-<?php echo $post_id; ?>" onkeyup="imageEdit.setNumSelection(<?php echo $post_id; ?>)" style="width:4em;" />
		:
		<input type="text" id="imgedit-sel-height-<?php echo $post_id; ?>" onkeyup="imageEdit.setNumSelection(<?php echo $post_id; ?>)" style="width:4em;" />
		</span>
	</p>
	</div>

	<?php if ( $thumb && $sub_sizes ) {
		$thumb_img = wp_constrain_dimensions( $thumb['width'], $thumb['height'], 160, 120 );
	?>

	<div class="imgedit-group imgedit-applyto">
	<div class="imgedit-group-top">
		<strong><?php _e('Thumbnail Settings'); ?></strong>
		<a class="imgedit-help-toggle" onclick="imageEdit.toggleHelp(this);return false;" href="#"><?php _e('(help)'); ?></a>
		<p class="imgedit-help"><?php _e('The thumbnail image can be cropped differently. For example it can be square or contain only a portion of the original image to showcase it better. Here you can select whether to apply changes to all image sizes or make the thumbnail different.'); ?></p>
	</div>

	<p>
		<img src="<?php echo $thumb['url']; ?>" width="<?php echo $thumb_img[0]; ?>" height="<?php echo $thumb_img[1]; ?>" class="imgedit-size-preview" alt="" /><br /><?php _e('Current thumbnail'); ?>
	</p>

	<p id="imgedit-save-target-<?php echo $post_id; ?>">
		<strong><?php _e('Apply changes to:'); ?></strong><br />

		<label class="imgedit-label">
		<input type="radio" name="imgedit-target-<?php echo $post_id; ?>" value="all" checked="checked" />
		<?php _e('All image sizes'); ?></label>

		<label class="imgedit-label">
		<input type="radio" name="imgedit-target-<?php echo $post_id; ?>" value="thumbnail" />
		<?php _e('Thumbnail'); ?></label>

		<label class="imgedit-label">
		<input type="radio" name="imgedit-target-<?php echo $post_id; ?>" value="nothumb" />
		<?php _e('All sizes except thumbnail'); ?></label>
	</p>
	</div>

	<?php } ?>

	</td></tr>
	</tbody></table>
	<div class="imgedit-wait" id="imgedit-wait-<?php echo $post_id; ?>"></div>
	<script type="text/javascript">jQuery( function() { imageEdit.init(<?php echo $post_id; ?>); });</script>
	<div class="hidden" id="imgedit-leaving-<?php echo $post_id; ?>"><?php _e("There are unsaved changes that will be lost. 'OK' to continue, 'Cancel' to return to the Image Editor."); ?></div>
	</div>
<?php
}

/**
 * Streams image in WP_Image_Editor to browser.
 * Provided for backcompat reasons
 *
 * @param WP_Image_Editor $image
 * @param string $mime_type
 * @param int $post_id
 * @return boolean
 */
function wp_stream_image( $image, $mime_type, $post_id ) {
	if ( $image instanceof WP_Image_Editor ) {
		$image = apply_filters('image_editor_save_pre', $image, $post_id);

		if ( is_wp_error( $image->stream( $mime_type ) ) )
			return false;

		return true;
	} else {
		_deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) );

		$image = apply_filters('image_save_pre', $image, $post_id);

		switch ( $mime_type ) {
			case 'image/jpeg':
				header( 'Content-Type: image/jpeg' );
				return imagejpeg( $image, null, 90 );
			case 'image/png':
				header( 'Content-Type: image/png' );
				return imagepng( $image );
			case 'image/gif':
				header( 'Content-Type: image/gif' );
				return imagegif( $image );
			default:
				return false;
		}
	}
}

/**
 * Saves Image to File
 *
 * @param string $filename
 * @param WP_Image_Editor $image
 * @param string $mime_type
 * @param int $post_id
 * @return boolean
 */
function wp_save_image_file( $filename, $image, $mime_type, $post_id ) {
	if ( $image instanceof WP_Image_Editor ) {
		$image = apply_filters('image_editor_save_pre', $image, $post_id);
		$saved = apply_filters('wp_save_image_editor_file', null, $filename, $image, $mime_type, $post_id);

		if ( null !== $saved )
			return $saved;

		return $image->save( $filename, $mime_type );
	} else {
		_deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) );

		$image = apply_filters('image_save_pre', $image, $post_id);
		$saved = apply_filters('wp_save_image_file', null, $filename, $image, $mime_type, $post_id);

		if ( null !== $saved )
			return $saved;

		switch ( $mime_type ) {
			case 'image/jpeg':
				return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) );
			case 'image/png':
				return imagepng( $image, $filename );
			case 'image/gif':
				return imagegif( $image, $filename );
			default:
				return false;
		}
	}
}

function _image_get_preview_ratio($w, $h) {
	$max = max($w, $h);
	return $max > 400 ? (400 / $max) : 1;
}

// @TODO: Returns GD resource, but is NOT public
function _rotate_image_resource($img, $angle) {
	_deprecated_function( __FUNCTION__, '3.5', __( 'Use WP_Image_Editor::rotate' ) );
	if ( function_exists('imagerotate') ) {
		$rotated = imagerotate($img, $angle, 0);
		if ( is_resource($rotated) ) {
			imagedestroy($img);
			$img = $rotated;
		}
	}
	return $img;
}

/**
 * @TODO: Only used within image_edit_apply_changes
 *		  and receives/returns GD Resource.
 *		  Consider removal.
 *
 * @param GD_Resource $img
 * @param boolean $horz
 * @param boolean $vert
 * @return GD_Resource
 */
function _flip_image_resource($img, $horz, $vert) {
	_deprecated_function( __FUNCTION__, '3.5', __( 'Use WP_Image_Editor::flip' ) );
	$w = imagesx($img);
	$h = imagesy($img);
	$dst = wp_imagecreatetruecolor($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, $img, 0, 0, $sx, $sy, $w, $h, $sw, $sh) ) {
			imagedestroy($img);
			$img = $dst;
		}
	}
	return $img;
}

/**
 * @TODO: Only used within image_edit_apply_changes
 *		  and receives/returns GD Resource.
 *		  Consider removal.
 *
 * @param GD_Resource $img
 * @param float $x
 * @param float $y
 * @param float $w
 * @param float $h
 * @return GD_Resource
 */
function _crop_image_resource($img, $x, $y, $w, $h) {
	$dst = wp_imagecreatetruecolor($w, $h);
	if ( is_resource($dst) ) {
		if ( imagecopy($dst, $img, 0, 0, $x, $y, $w, $h) ) {
			imagedestroy($img);
			$img = $dst;
		}
	}
	return $img;
}

/**
 * Performs group of changes on Editor specified.
 *
 * @param WP_Image_Editor $image
 * @param type $changes
 * @return WP_Image_Editor
 */
function image_edit_apply_changes( $image, $changes ) {
	if ( is_resource( $image ) )
		_deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) );

	if ( !is_array($changes) )
		return $image;

	// expand change operations
	foreach ( $changes as $key => $obj ) {
		if ( isset($obj->r) ) {
			$obj->type = 'rotate';
			$obj->angle = $obj->r;
			unset($obj->r);
		} elseif ( isset($obj->f) ) {
			$obj->type = 'flip';
			$obj->axis = $obj->f;
			unset($obj->f);
		} elseif ( isset($obj->c) ) {
			$obj->type = 'crop';
			$obj->sel = $obj->c;
			unset($obj->c);
		}
		$changes[$key] = $obj;
	}

	// combine operations
	if ( count($changes) > 1 ) {
		$filtered = array($changes[0]);
		for ( $i = 0, $j = 1; $j < count($changes); $j++ ) {
			$combined = false;
			if ( $filtered[$i]->type == $changes[$j]->type ) {
				switch ( $filtered[$i]->type ) {
					case 'rotate':
						$filtered[$i]->angle += $changes[$j]->angle;
						$combined = true;
						break;
					case 'flip':
						$filtered[$i]->axis ^= $changes[$j]->axis;
						$combined = true;
						break;
				}
			}
			if ( !$combined )
				$filtered[++$i] = $changes[$j];
		}
		$changes = $filtered;
		unset($filtered);
	}

	// image resource before applying the changes
	if ( $image instanceof WP_Image_Editor )
		$image = apply_filters('wp_image_editor_before_change', $image, $changes);
	elseif ( is_resource( $image ) )
		$image = apply_filters('image_edit_before_change', $image, $changes);

	foreach ( $changes as $operation ) {
		switch ( $operation->type ) {
			case 'rotate':
				if ( $operation->angle != 0 ) {
					if ( $image instanceof WP_Image_Editor )
						$image->rotate( $operation->angle );
					else
						$image = _rotate_image_resource( $image, $operation->angle );
				}
				break;
			case 'flip':
				if ( $operation->axis != 0 )
					if ( $image instanceof WP_Image_Editor )
						$image->flip( ($operation->axis & 1) != 0, ($operation->axis & 2) != 0 );
					else
						$image = _flip_image_resource( $image, ( $operation->axis & 1 ) != 0, ( $operation->axis & 2 ) != 0 );
				break;
			case 'crop':
				$sel = $operation->sel;

				if ( $image instanceof WP_Image_Editor ) {
					$size = $image->get_size();
					$w = $size['width'];
					$h = $size['height'];

					$scale = 1 / _image_get_preview_ratio( $w, $h ); // discard preview scaling
					$image->crop( $sel->x * $scale, $sel->y * $scale, $sel->w * $scale, $sel->h * $scale );
				} else {
					$scale = 1 / _image_get_preview_ratio( imagesx( $image ), imagesy( $image ) ); // discard preview scaling
					$image = _crop_image_resource( $image, $sel->x * $scale, $sel->y * $scale, $sel->w * $scale, $sel->h * $scale );
				}
				break;
		}
	}

	return $image;
}


/**
 * Streams image in post to browser, along with enqueued changes
 * in $_REQUEST['history']
 *
 * @param int $post_id
 * @return boolean
 */
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 = wp_get_image_editor( _load_image_to_edit_path( $post_id ) );

    if ( is_wp_error( $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
	$size = $img->get_size();
	$w = $size['width'];
	$h = $size['height'];

	$ratio = _image_get_preview_ratio( $w, $h );
	$w2 = $w * $ratio;
	$h2 = $h * $ratio;

	if ( is_wp_error( $img->resize( $w2, $h2 ) ) )
		return false;

	return wp_stream_image( $img, $post->post_mime_type, $post_id );
}

function wp_restore_image($post_id) {
	$meta = wp_get_attachment_metadata($post_id);
	$file = get_attached_file($post_id);
	$backup_sizes = get_post_meta( $post_id, '_wp_attachment_backup_sizes', true );
	$restored = false;
	$msg = new stdClass;

	if ( !is_array($backup_sizes) ) {
		$msg->error = __('Cannot load image metadata.');
		return $msg;
	}

	$parts = pathinfo($file);
	$suffix = time() . rand(100, 999);
	$default_sizes = get_intermediate_image_sizes();

	if ( isset($backup_sizes['full-orig']) && is_array($backup_sizes['full-orig']) ) {
		$data = $backup_sizes['full-orig'];

		if ( $parts['basename'] != $data['file'] ) {
			if ( defined('IMAGE_EDIT_OVERWRITE') && IMAGE_EDIT_OVERWRITE ) {
				// delete only if it's edited image
				if ( preg_match('/-e[0-9]{13}\./', $parts['basename']) ) {
					$delpath = apply_filters('wp_delete_file', $file);
					@unlink($delpath);
				}
			} else {
				$backup_sizes["full-$suffix"] = array('width' => $meta['width'], 'height' => $meta['height'], 'file' => $parts['basename']);
			}
		}

		$restored_file = path_join($parts['dirname'], $data['file']);
		$restored = update_attached_file($post_id, $restored_file);

		$meta['file'] = _wp_relative_upload_path( $restored_file );
		$meta['width'] = $data['width'];
		$meta['height'] = $data['height'];
	}

	foreach ( $default_sizes as $default_size ) {
		if ( isset($backup_sizes["$default_size-orig"]) ) {
			$data = $backup_sizes["$default_size-orig"];
			if ( isset($meta['sizes'][$default_size]) && $meta['sizes'][$default_size]['file'] != $data['file'] ) {
				if ( defined('IMAGE_EDIT_OVERWRITE') && IMAGE_EDIT_OVERWRITE ) {
					// delete only if it's edited image
					if ( preg_match('/-e[0-9]{13}-/', $meta['sizes'][$default_size]['file']) ) {
						$delpath = apply_filters( 'wp_delete_file', path_join($parts['dirname'], $meta['sizes'][$default_size]['file']) );
						@unlink($delpath);
					}
				} else {
					$backup_sizes["$default_size-{$suffix}"] = $meta['sizes'][$default_size];
				}
			}

			$meta['sizes'][$default_size] = $data;
		} else {
			unset($meta['sizes'][$default_size]);
		}
	}

	if ( !wp_update_attachment_metadata($post_id, $meta) || !update_post_meta( $post_id, '_wp_attachment_backup_sizes', $backup_sizes) ) {
		$msg->error = __('Cannot save image metadata.');
		return $msg;
	}

	if ( !$restored )
		$msg->error = __('Image metadata is inconsistent.');
	else
		$msg->msg = __('Image restored successfully.');

	return $msg;
}

/**
 * Saves image to post along with enqueued changes
 * in $_REQUEST['history']
 *
 * @param int $post_id
 * @return \stdClass
 */
function wp_save_image( $post_id ) {
	$return = new stdClass;
	$success = $delete = $scaled = $nocrop = false;
	$post = get_post( $post_id );

	$img = wp_get_image_editor( _load_image_to_edit_path( $post_id, 'full' ) );
	if ( is_wp_error( $img ) ) {
		$return->error = esc_js( __('Unable to create new image.') );
		return $return;
	}

	$fwidth = !empty($_REQUEST['fwidth']) ? intval($_REQUEST['fwidth']) : 0;
	$fheight = !empty($_REQUEST['fheight']) ? intval($_REQUEST['fheight']) : 0;
	$target = !empty($_REQUEST['target']) ? preg_replace('/[^a-z0-9_-]+/i', '', $_REQUEST['target']) : '';
	$scale = !empty($_REQUEST['do']) && 'scale' == $_REQUEST['do'];

	if ( $scale && $fwidth > 0 && $fheight > 0 ) {
		$size = $img->get_size();
		$sX = $size['width'];
		$sY = $size['height'];

		// check if it has roughly the same w / h ratio
		$diff = round($sX / $sY, 2) - round($fwidth / $fheight, 2);
		if ( -0.1 < $diff && $diff < 0.1 ) {
			// scale the full size image
			if ( $img->resize( $fwidth, $fheight ) )
				$scaled = true;
		}

		if ( !$scaled ) {
			$return->error = esc_js( __('Error while saving the scaled image. Please reload the page and try again.') );
			return $return;
		}
	} elseif ( !empty($_REQUEST['history']) ) {
		$changes = json_decode( stripslashes($_REQUEST['history']) );
		if ( $changes )
			$img = image_edit_apply_changes($img, $changes);
	} else {
		$return->error = esc_js( __('Nothing to save, the image has not changed.') );
		return $return;
	}

	$meta = wp_get_attachment_metadata($post_id);
	$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );

	if ( !is_array($meta) ) {
		$return->error = esc_js( __('Image data does not exist. Please re-upload the image.') );
		return $return;
	}

	if ( !is_array($backup_sizes) )
		$backup_sizes = array();

	// generate new filename
	$path = get_attached_file($post_id);
	$path_parts = pathinfo( $path );
	$filename = $path_parts['filename'];
	$suffix = time() . rand(100, 999);

	if ( defined('IMAGE_EDIT_OVERWRITE') && IMAGE_EDIT_OVERWRITE &&
		isset($backup_sizes['full-orig']) && $backup_sizes['full-orig']['file'] != $path_parts['basename'] ) {

		if ( 'thumbnail' == $target )
			$new_path = "{$path_parts['dirname']}/{$filename}-temp.{$path_parts['extension']}";
		else
			$new_path = $path;
	} else {
		while( true ) {
			$filename = preg_replace( '/-e([0-9]+)$/', '', $filename );
			$filename .= "-e{$suffix}";
			$new_filename = "{$filename}.{$path_parts['extension']}";
			$new_path = "{$path_parts['dirname']}/$new_filename";
			if ( file_exists($new_path) )
				$suffix++;
			else
				break;
		}
	}

	// save the full-size file, also needed to create sub-sizes
	if ( !wp_save_image_file($new_path, $img, $post->post_mime_type, $post_id) ) {
		$return->error = esc_js( __('Unable to save the image.') );
		return $return;
	}

	if ( 'nothumb' == $target || 'all' == $target || 'full' == $target || $scaled ) {
		$tag = false;
		if ( isset($backup_sizes['full-orig']) ) {
			if ( ( !defined('IMAGE_EDIT_OVERWRITE') || !IMAGE_EDIT_OVERWRITE ) && $backup_sizes['full-orig']['file'] != $path_parts['basename'] )
				$tag = "full-$suffix";
		} else {
			$tag = 'full-orig';
		}

		if ( $tag )
			$backup_sizes[$tag] = array('width' => $meta['width'], 'height' => $meta['height'], 'file' => $path_parts['basename']);

		$success = update_attached_file( $post_id, $new_path );

		$meta['file'] = _wp_relative_upload_path( $new_path );

		$size = $img->get_size();
		$meta['width'] = $size['width'];
		$meta['height'] = $size['height'];

		if ( $success && ('nothumb' == $target || 'all' == $target) ) {
			$sizes = get_intermediate_image_sizes();
			if ( 'nothumb' == $target )
				$sizes = array_diff( $sizes, array('thumbnail') );
		}

		$return->fw = $meta['width'];
		$return->fh = $meta['height'];
	} elseif ( 'thumbnail' == $target ) {
		$sizes = array( 'thumbnail' );
		$success = $delete = $nocrop = true;
	}

	if ( isset( $sizes ) ) {
		$_sizes = array();

		foreach ( $sizes as $size ) {
			$tag = false;
			if ( isset( $meta['sizes'][$size] ) ) {
				if ( isset($backup_sizes["$size-orig"]) ) {
					if ( ( !defined('IMAGE_EDIT_OVERWRITE') || !IMAGE_EDIT_OVERWRITE ) && $backup_sizes["$size-orig"]['file'] != $meta['sizes'][$size]['file'] )
						$tag = "$size-$suffix";
				} else {
					$tag = "$size-orig";
				}

				if ( $tag )
					$backup_sizes[$tag] = $meta['sizes'][$size];
			}

			$crop = $nocrop ? false : get_option("{$size}_crop");
			$_sizes[ $size ] = array( 'width' => get_option("{$size}_size_w"), 'height' => get_option("{$size}_size_h"), 'crop' => $crop );
		}

		$meta['sizes'] = $img->multi_resize( $_sizes );
	}

	unset( $img );

	if ( $success ) {
		wp_update_attachment_metadata( $post_id, $meta );
		update_post_meta( $post_id, '_wp_attachment_backup_sizes', $backup_sizes);

		if ( $target == 'thumbnail' || $target == 'all' || $target == 'full' ) {
			// Check if it's an image edit from attachment edit screen
			if ( ! empty( $_REQUEST['context'] ) && 'edit-attachment' == $_REQUEST['context'] ) {
				$thumb_url = wp_get_attachment_image_src( $post_id, array( 900, 600 ), true );
				$return->thumbnail = $thumb_url[0];
			} else {
				$file_url = wp_get_attachment_url($post_id);
				if ( $thumb = $meta['sizes']['thumbnail'] )
					$return->thumbnail = path_join( dirname($file_url), $thumb['file'] );
				else
					$return->thumbnail = "$file_url?w=128&h=128";
			}
		}
	} else {
		$delete = true;
	}

	if ( $delete ) {
		$delpath = apply_filters('wp_delete_file', $new_path);
		@unlink( $delpath );
	}

	$return->msg = esc_js( __('Image saved') );
	return $return;
}