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- /*
- * 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>Optional interface which indicates that glyph substitution is supported and, if supported,
- * can perform substitution.</p>
- *
- * <p>This work was originally authored by Glenn Adams (gadams@apache.org).</p>
- */
- public interface Substitutable {
-
- /**
- * Determines if font performs glyph substitution.
- * @return true if performs substitution.
- */
- boolean performsSubstitution();
-
- /**
- * Perform substitutions on characters to effect glyph substitution. If some substitution is performed, it
- * entails mapping from one or more input characters denoting textual character information to one or more
- * output character codes denoting glyphs in this font, where the output character codes may make use of
- * private character code values that have significance only for this font.
- * @param cs character sequence to map to output font encoding character sequence
- * @param script a script identifier
- * @param language a language identifier
- * @return output sequence (represented as a character sequence, where each character in the returned sequence
- * denotes "font characters", i.e., character codes that map directly (1-1) to their associated glyphs
- */
- CharSequence performSubstitution ( CharSequence cs, String script, String language );
-
- /**
- * Reorder combining marks in character sequence so that they precede (within the sequence) the base
- * character to which they are applied. N.B. In the case of LTR segments, marks are not reordered by this,
- * method since when the segment is reversed by BIDI processing, marks are automatically reordered to precede
- * their base character.
- * @param cs character sequence within which combining marks to be reordered
- * @param gpa associated glyph position adjustments (also reordered)
- * @param script a script identifier
- * @param language a language identifier
- * @return output sequence containing reordered "font characters"
- */
- CharSequence reorderCombiningMarks ( CharSequence cs, int[][] gpa, String script, String language );
-
- }
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