| /* |
| * 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 |
| // CSOFF: NoWhitespaceAfterCheck |
| |
| /** |
| * The <code>GlyphSubstitutionSubtable</code> implements an abstract base of a glyph substitution subtable, |
| * providing a default implementation of the <code>GlyphSubstitution</code> interface. |
| * @author Glenn Adams |
| */ |
| public abstract class GlyphSubstitutionSubtable extends GlyphSubtable implements GlyphSubstitution { |
| |
| /** |
| * Instantiate a <code>GlyphSubstitutionSubtable</code>. |
| * @param id subtable identifier |
| * @param sequence subtable sequence |
| * @param flags subtable flags |
| * @param format subtable format |
| * @param coverage subtable coverage table |
| */ |
| protected GlyphSubstitutionSubtable ( String id, int sequence, int flags, int format, GlyphCoverageTable coverage ) { |
| super ( id, sequence, flags, format, coverage ); |
| } |
| |
| /** {@inheritDoc} */ |
| public int getTableType() { |
| return GlyphTable.GLYPH_TABLE_TYPE_SUBSTITUTION; |
| } |
| |
| /** {@inheritDoc} */ |
| public String getTypeName() { |
| return GlyphSubstitutionTable.getLookupTypeName ( getType() ); |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean isCompatible ( GlyphSubtable subtable ) { |
| return subtable instanceof GlyphSubstitutionSubtable; |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean usesReverseScan() { |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean substitute ( GlyphSubstitutionState ss ) { |
| return false; |
| } |
| |
| /** |
| * Apply substitutions using specified state and subtable array. For each position in input sequence, |
| * apply subtables in order until some subtable applies or none remain. If no subtable applied or no |
| * input was consumed for a given position, then apply default action (copy input glyph and advance). |
| * If <code>sequenceIndex</code> is non-negative, then apply subtables only when current position |
| * matches <code>sequenceIndex</code> in relation to the starting position. Furthermore, upon |
| * successful application at <code>sequenceIndex</code>, then apply default action for all remaining |
| * glyphs in input sequence. |
| * @param ss substitution state |
| * @param sta array of subtables to apply |
| * @param sequenceIndex if non negative, then apply subtables only at specified sequence index |
| * @return output glyph sequence |
| */ |
| public static final GlyphSequence substitute ( GlyphSubstitutionState ss, GlyphSubstitutionSubtable[] sta, int sequenceIndex ) { |
| int sequenceStart = ss.getPosition(); |
| boolean appliedOneShot = false; |
| while ( ss.hasNext() ) { |
| boolean applied = false; |
| if ( ! appliedOneShot && ss.maybeApplicable() ) { |
| for ( int i = 0, n = sta.length; ! applied && ( i < n ); i++ ) { |
| if ( sequenceIndex < 0 ) { |
| applied = ss.apply ( sta [ i ] ); |
| } else if ( ss.getPosition() == ( sequenceStart + sequenceIndex ) ) { |
| applied = ss.apply ( sta [ i ] ); |
| if ( applied ) { |
| appliedOneShot = true; |
| } |
| } |
| } |
| } |
| if ( ! applied || ! ss.didConsume() ) { |
| ss.applyDefault(); |
| } |
| ss.next(); |
| } |
| return ss.getOutput(); |
| } |
| |
| /** |
| * Apply substitutions. |
| * @param gs input glyph sequence |
| * @param script tag |
| * @param language tag |
| * @param feature tag |
| * @param sta subtable array |
| * @param sct script context tester |
| * @return output glyph sequence |
| */ |
| public static final GlyphSequence substitute ( GlyphSequence gs, String script, String language, String feature, GlyphSubstitutionSubtable[] sta, ScriptContextTester sct ) { |
| return substitute ( new GlyphSubstitutionState ( gs, script, language, feature, sct ), sta, -1 ); |
| } |
| |
| } |