| /* |
| * 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.fonts; |
| |
| // CSOFF: LineLengthCheck |
| |
| /** |
| * Optional interface which indicates that glyph substitution is supported and, if supported, |
| * can perform substitution. |
| * @author Glenn Adams |
| */ |
| 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 ); |
| |
| } |