/*
* 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.scripts;
import org.apache.fop.complexscripts.fonts.GlyphDefinitionTable;
import org.apache.fop.complexscripts.util.CharAssociation;
import org.apache.fop.complexscripts.util.GlyphSequence;
import org.apache.fop.complexscripts.util.ScriptContextTester;
// CSOFF: LineLengthCheck
/**
* <p>Default script processor, which enables default glyph composition/decomposition, common ligatures, localized forms
* and kerning.</p>
*
* <p>This work was originally authored by Glenn Adams (gadams@apache.org).</p>
*/
public class DefaultScriptProcessor extends ScriptProcessor {
/** features to use for substitutions */
private static final String[] GSUB_FEATURES =
{
"ccmp", // glyph composition/decomposition
"liga", // common ligatures
"locl" // localized forms
};
/** features to use for positioning */
private static final String[] GPOS_FEATURES =
{
"kern", // kerning
"mark", // mark to base or ligature positioning
"mkmk" // mark to mark positioning
};
DefaultScriptProcessor(String script) {
super(script);
}
@Override
/** {@inheritDoc} */
public String[] getSubstitutionFeatures() {
return GSUB_FEATURES;
}
@Override
/** {@inheritDoc} */
public ScriptContextTester getSubstitutionContextTester() {
return null;
}
@Override
/** {@inheritDoc} */
public String[] getPositioningFeatures() {
return GPOS_FEATURES;
}
@Override
/** {@inheritDoc} */
public ScriptContextTester getPositioningContextTester() {
return null;
}
@Override
/** {@inheritDoc} */
public GlyphSequence reorderCombiningMarks(GlyphDefinitionTable gdef, GlyphSequence gs, int[] unscaledWidths, int[][] gpa, String script, String language) {
int ng = gs.getGlyphCount();
int[] ga = gs.getGlyphArray(false);
int nm = 0;
// count combining marks
for (int i = 0; i < ng; i++) {
int gid = ga [ i ];
int gw = unscaledWidths [ i ];
if (isReorderedMark(gdef, ga, unscaledWidths, i)) {
nm++;
}
}
// only reorder if there is at least one mark and at least one non-mark glyph
if ((nm > 0) && ((ng - nm) > 0)) {
CharAssociation[] aa = gs.getAssociations(0, -1);
int[] nga = new int [ ng ];
int[][] npa = (gpa != null) ? new int [ ng ][] : null;
CharAssociation[] naa = new CharAssociation [ ng ];
int k = 0;
CharAssociation ba = null;
int bg = -1;
int[] bpa = null;
for (int i = 0; i < ng; i++) {
int gid = ga [ i ];
int[] pa = (gpa != null) ? gpa [ i ] : null;
CharAssociation ca = aa [ i ];
if (isReorderedMark(gdef, ga, unscaledWidths, i)) {
nga [ k ] = gid;
naa [ k ] = ca;
if (npa != null) {
npa [ k ] = pa;
}
k++;
} else {
if (bg != -1) {
nga [ k ] = bg;
naa [ k ] = ba;
if (npa != null) {
npa [ k ] = bpa;
}
k++;
bg = -1;
ba = null;
bpa = null;
}
if (bg == -1) {
bg = gid;
ba = ca;
bpa = pa;
}
}
}
if (bg != -1) {
nga [ k ] = bg;
naa [ k ] = ba;
if (npa != null) {
npa [ k ] = bpa;
}
k++;
}
assert k == ng;
if (npa != null) {
System.arraycopy(npa, 0, gpa, 0, ng);
}
return new GlyphSequence(gs, null, nga, null, null, naa, null);
} else {
return gs;
}
}
protected boolean isReorderedMark(GlyphDefinitionTable gdef, int[] glyphs, int[] unscaledWidths, int index) {
return gdef.isGlyphClass(glyphs[index], GlyphDefinitionTable.GLYPH_CLASS_MARK) && (unscaledWidths[index] != 0);
}
}