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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;
-
- import org.apache.fop.complexscripts.util.GlyphSequence;
- import org.apache.fop.complexscripts.util.ScriptContextTester;
-
- // CSOFF: LineLengthCheck
-
- /**
- * <p>The <code>GlyphPositioningSubtable</code> implements an abstract base of a glyph subtable,
- * providing a default implementation of the <code>GlyphPositioning</code> interface.</p>
- *
- * <p>This work was originally authored by Glenn Adams (gadams@apache.org).</p>
- */
- public abstract class GlyphPositioningSubtable extends GlyphSubtable implements GlyphPositioning {
-
- private static final GlyphPositioningState STATE = new GlyphPositioningState();
-
- /**
- * Instantiate a <code>GlyphPositioningSubtable</code>.
- * @param id subtable identifier
- * @param sequence subtable sequence
- * @param flags subtable flags
- * @param format subtable format
- * @param coverage subtable coverage table
- */
- protected GlyphPositioningSubtable(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_POSITIONING;
- }
-
- /** {@inheritDoc} */
- public String getTypeName() {
- return GlyphPositioningTable.getLookupTypeName(getType());
- }
-
- /** {@inheritDoc} */
- public boolean isCompatible(GlyphSubtable subtable) {
- return subtable instanceof GlyphPositioningSubtable;
- }
-
- /** {@inheritDoc} */
- public boolean usesReverseScan() {
- return false;
- }
-
- /** {@inheritDoc} */
- public boolean position(GlyphPositioningState ps) {
- return false;
- }
-
- /**
- * Apply positioning 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 (no adjustments 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 discontinue processing the remaining
- * @param ps positioning state
- * @param sta array of subtables to apply
- * @param sequenceIndex if non negative, then apply subtables only at specified sequence index
- * @return true if a non-zero adjustment occurred
- */
- public static final boolean position(GlyphPositioningState ps, GlyphPositioningSubtable[] sta, int sequenceIndex) {
- int sequenceStart = ps.getPosition();
- boolean appliedOneShot = false;
- while (ps.hasNext()) {
- boolean applied = false;
- if (!appliedOneShot && ps.maybeApplicable()) {
- for (int i = 0, n = sta.length; !applied && (i < n); i++) {
- if (sequenceIndex < 0) {
- applied = ps.apply(sta [ i ]);
- } else if (ps.getPosition() == (sequenceStart + sequenceIndex)) {
- applied = ps.apply(sta [ i ]);
- if (applied) {
- appliedOneShot = true;
- }
- }
- }
- }
- if (!applied || !ps.didConsume()) {
- ps.applyDefault();
- }
- ps.next();
- }
- return ps.getAdjusted();
- }
-
- /**
- * Apply positioning.
- * @param gs input glyph sequence
- * @param script tag
- * @param language tag
- * @param feature tag
- * @param fontSize the font size
- * @param sta subtable array
- * @param widths array
- * @param adjustments array (receives output adjustments)
- * @param sct script context tester
- * @return true if a non-zero adjustment occurred
- */
- public static final boolean position(GlyphSequence gs, String script, String language, String feature, int fontSize, GlyphPositioningSubtable[] sta, int[] widths, int[][] adjustments, ScriptContextTester sct) {
- synchronized (STATE) {
- return position(STATE.reset(gs, script, language, feature, fontSize, widths, adjustments, sct), sta, -1);
- }
- }
-
- }
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