| /* |
| * 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 ]; |
| int[] pa = (gpa != null) ? gpa[i] : null; |
| if (isReorderedMark(gdef, ga, unscaledWidths, i, pa)) { |
| 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; |
| int[] order = new int[ng]; |
| for (int i = 0; i < ng; i++) { |
| order[i] = i; |
| } |
| for (int i = 1; i < ng; i++) { |
| int[] pa = (gpa != null) ? gpa[i] : null; |
| if (isReorderedMark(gdef, ga, unscaledWidths, i, pa)) { |
| for (int j = i; j > 0; j--) { |
| switchGlyphs(order, j); |
| int[] paj = (gpa != null) ? gpa[order[j]] : null; |
| if (!isMarkNotReordered(gdef, ga, order[j], paj)) { |
| break; |
| } |
| } |
| } |
| } |
| for (int i = 0; i < ng; i++) { |
| nga[i] = ga[order[i]]; |
| naa[i] = aa[order[i]]; |
| if (gpa != null) { |
| npa[i] = gpa[order[i]]; |
| } |
| } |
| if (npa != null) { |
| System.arraycopy(npa, 0, gpa, 0, ng); |
| } |
| return new GlyphSequence(gs, null, nga, null, null, naa, null); |
| } else { |
| return gs; |
| } |
| } |
| |
| private static void switchGlyphs(int[] order, int i) { |
| if (i < 1) { |
| throw new IllegalArgumentException(i + " must be > 0"); |
| } |
| int oi = order[i]; |
| order[i] = order[i - 1]; |
| order[i - 1] = oi; |
| } |
| |
| protected boolean isReorderedMark(GlyphDefinitionTable gdef, int[] glyphs, int[] unscaledWidths, int index, int[] pa) { |
| pa = (pa != null) ? pa : new int[1]; |
| return gdef.isGlyphClass(glyphs[index], GlyphDefinitionTable.GLYPH_CLASS_MARK) && pa[0] != 0; |
| } |
| |
| private boolean isMarkNotReordered(GlyphDefinitionTable gdef, int[] glyphs, int index, int[] pa) { |
| pa = (pa != null) ? pa : new int[1]; |
| return gdef.isGlyphClass(glyphs[index], GlyphDefinitionTable.GLYPH_CLASS_MARK) && pa[0] == 0; |
| } |
| } |