/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id$ */

package org.apache.fop.complexscripts.fonts;

// CSOFF: LineLengthCheck

/**
 * <p>The <code>GlyphPositioning</code> interface is implemented by a glyph positioning subtable
 * that supports the determination of glyph positioning information based on script and
 * language of the corresponding character content.</p>
 *
 * <p>This work was originally authored by Glenn Adams (gadams@apache.org).</p>
 */
public interface GlyphPositioning {

    /**
     * Perform glyph positioning at the current index, mutating the positioning state object as required.
     * Only the context associated with the current index is processed.
     * @param ps glyph positioning state object
     * @return true if the glyph subtable applies, meaning that the current context matches the
     * associated input context glyph coverage table; note that returning true does not mean any position
     * adjustment occurred; it only means that no further glyph subtables for the current lookup table
     * should be applied.
     */
    boolean position(GlyphPositioningState ps);

}
