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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.fonts;
-
- import java.util.BitSet;
- import java.util.Collections;
- import java.util.Iterator;
- import java.util.Map;
-
- import org.apache.fop.util.CharUtilities;
-
- //Naming:
- //glyph index: original index of the glyph in the non-subset font (!= unicode index)
- //character selector: index into a set of glyphs. For subset CID fonts, this starts at 0. For
- // non-subset fonts, this is the same as the glyph index.
- //Unicode index: The Unicode codepoint of a character.
- //Glyph name: the Adobe glyph name (as found in Glyphs.java)
-
- /**
- * Keeps track of the glyphs used in a document. This information is later used to build
- * a subset of a font.
- */
- public class CIDSubset {
-
- /**
- * usedGlyphs contains orginal, new glyph index (glyph index -> char selector)
- */
- private Map/*<Integer, Integer>*/ usedGlyphs = new java.util.HashMap();
-
- /**
- * usedGlyphsIndex contains new glyph, original index (char selector -> glyph index)
- */
- private Map/*<Integer, Integer>*/ usedGlyphsIndex = new java.util.HashMap();
- private int usedGlyphsCount = 0;
-
- /**
- * usedCharsIndex contains new glyph, original char (char selector -> Unicode)
- */
- private Map/*<Integer, Character>*/ usedCharsIndex = new java.util.HashMap();
-
- public CIDSubset() {
- }
-
- /**
- * Adds the initial 3 glyphs which are the same for all CID subsets.
- */
- public void setupFirstThreeGlyphs() {
- // Make sure that the 3 first glyphs are included
- usedGlyphs.put(new Integer(0), new Integer(0));
- usedGlyphsIndex.put(new Integer(0), new Integer(0));
- usedGlyphsCount++;
- usedGlyphs.put(new Integer(1), new Integer(1));
- usedGlyphsIndex.put(new Integer(1), new Integer(1));
- usedGlyphsCount++;
- usedGlyphs.put(new Integer(2), new Integer(2));
- usedGlyphsIndex.put(new Integer(2), new Integer(2));
- usedGlyphsCount++;
- }
-
- /**
- * Returns the original index of the glyph inside the (non-subset) font's glyph list. This
- * index can be used to access the character width information, for example.
- * @param subsetIndex the subset index (character selector) to access the glyph
- * @return the original index (or -1 if no glyph index is available for the subset index)
- */
- public int getGlyphIndexForSubsetIndex(int subsetIndex) {
- Integer glyphIndex = (Integer)usedGlyphsIndex.get(new Integer(subsetIndex));
- if (glyphIndex != null) {
- return glyphIndex.intValue();
- } else {
- return -1;
- }
- }
-
- /**
- * Returns the Unicode value for a subset index (character selector). If there's no such
- * Unicode value, the "NOT A CHARACTER" (0xFFFF) is returned.
- * @param subsetIndex the subset index (character selector)
- * @return the Unicode value or "NOT A CHARACTER" (0xFFFF)
- */
- public char getUnicodeForSubsetIndex(int subsetIndex) {
- Character mapValue = (Character)usedCharsIndex.get(new Integer(subsetIndex));
- if (mapValue != null) {
- return mapValue.charValue();
- } else {
- return CharUtilities.NOT_A_CHARACTER;
- }
- }
-
- /**
- * Maps a character to a character selector for a font subset. If the character isn't in the
- * subset, yet, it is added and a new character selector returned. Otherwise, the already
- * allocated character selector is returned from the existing map/subset.
- * @param glyphIndex the glyph index of the character
- * @param unicode the Unicode index of the character
- * @return the subset index
- */
- public int mapSubsetChar(int glyphIndex, char unicode) {
- // Reencode to a new subset font or get the reencoded value
- // IOW, accumulate the accessed characters and build a character map for them
- Integer subsetCharSelector = (Integer)usedGlyphs.get(new Integer(glyphIndex));
- if (subsetCharSelector == null) {
- int selector = usedGlyphsCount;
- usedGlyphs.put(new Integer(glyphIndex),
- new Integer(selector));
- usedGlyphsIndex.put(new Integer(selector),
- new Integer(glyphIndex));
- usedCharsIndex.put(new Integer(selector),
- new Character(unicode));
- usedGlyphsCount++;
- return selector;
- } else {
- return subsetCharSelector.intValue();
- }
- }
-
- /**
- * Returns an unmodifiable Map of the font subset. It maps from glyph index to
- * character selector (i.e. the subset index in this case).
- * @return Map Map<Integer, Integer> of the font subset
- */
- public Map/*<Integer, Integer>*/ getSubsetGlyphs() {
- return Collections.unmodifiableMap(this.usedGlyphs);
- }
-
- /**
- * Returns a char array containing all Unicode characters that are in the subset.
- * @return a char array with all used Unicode characters
- */
- public char[] getSubsetChars() {
- char[] charArray = new char[usedGlyphsCount];
- for (int i = 0; i < usedGlyphsCount; i++) {
- charArray[i] = getUnicodeForSubsetIndex(i);
- }
- return charArray;
- }
-
- /**
- * Returns the number of glyphs in the subset.
- * @return the number of glyphs in the subset
- */
- public int getSubsetSize() {
- return this.usedGlyphsCount;
- }
-
- /**
- * Returns a BitSet with bits set for each available glyph index in the subset.
- * @return a BitSet indicating available glyph indices
- */
- public BitSet getGlyphIndexBitSet() {
- BitSet bitset = new BitSet();
- Iterator iter = usedGlyphsIndex.keySet().iterator();
- while (iter.hasNext()) {
- Integer cid = (Integer)iter.next();
- bitset.set(cid.intValue());
- }
- return bitset;
- }
-
- }
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