| /* |
| * 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; |
| } |
| |
| } |