image_edit_apply_changes( WP_Image_Editor $image, array $changes )

function image_edit_apply_changes( $image, $changes ) {
	if ( is_resource( $image ) )
		_deprecated_argument( __FUNCTION__, 'WP-3.5.0', __( '$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, $c = count( $changes ); $j < $c; $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 ) {

		/**
		 * Filters the WP_Image_Editor instance before applying changes to the image.
		 *
		 * @since WP-3.5.0
		 *
		 * @param WP_Image_Editor $image   WP_Image_Editor instance.
 		 * @param array           $changes Array of change operations.
		 */
		$image = apply_filters( 'wp_image_editor_before_change', $image, $changes );
	} elseif ( is_resource( $image ) ) {

		/**
		 * Filters the GD image resource before applying changes to the image.
		 *
		 * @since WP-2.9.0
		 * @deprecated WP-3.5.0 Use wp_image_editor_before_change instead.
		 *
		 * @param resource $image   GD image resource.
 		 * @param array    $changes Array of change operations.
		 */
		$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;
}