/*
* 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>GlyphSubstitution</code> interface is implemented by a glyph substitution subtable
* that supports the determination of glyph substitution 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 GlyphSubstitution {
/**
* Perform glyph substitution at the current index, mutating the substitution state object as required.
* Only the context associated with the current index is processed.
* @param ss glyph substitution state object
* @return true if the glyph subtable was applied, meaning that the current context matches the
* associated input context glyph coverage table
*/
boolean substitute(GlyphSubstitutionState ss);
}