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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.HashMap;
- import java.util.LinkedHashMap;
- import java.util.Map;
-
- import org.apache.fop.util.CharUtilities;
-
- /**
- * Provides methods to get font information.
- * 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)
- */
- public class CIDSubset implements CIDSet {
-
- /**
- * usedGlyphs contains orginal, new glyph index (glyph index -> char selector)
- */
- private Map<Integer, Integer> usedGlyphs = new LinkedHashMap<Integer, Integer>();
-
- /**
- * usedGlyphsIndex contains new glyph, original index (char selector -> glyph index)
- */
- private Map<Integer, Integer> usedGlyphsIndex = new HashMap<Integer, Integer>();
- private int usedGlyphsCount;
-
- /**
- * usedCharsIndex contains new glyph, original char (char selector -> Unicode)
- */
- private Map<Integer, Integer> usedCharsIndex = new HashMap<Integer, Integer>();
-
- /**
- * A map between the original character and it's GID in the original font.
- */
- private Map<Integer, Integer> charToGIDs = new HashMap<Integer, Integer>();
-
-
- private final MultiByteFont font;
-
- public CIDSubset(MultiByteFont mbf) {
- font = mbf;
- // The zeroth value is reserved for .notdef
- usedGlyphs.put(0, 0);
- usedGlyphsIndex.put(0, 0);
- usedGlyphsCount++;
- }
-
- /** {@inheritDoc} */
- public int getOriginalGlyphIndex(int index) {
- Integer glyphIndex = usedGlyphsIndex.get(index);
- if (glyphIndex != null) {
- return glyphIndex;
- } else {
- return -1;
- }
- }
-
- /** {@inheritDoc} */
- public int getUnicode(int index) {
- Integer mapValue = usedCharsIndex.get(index);
- if (mapValue != null) {
- return mapValue;
- } else {
- return CharUtilities.NOT_A_CHARACTER;
- }
- }
-
- /** {@inheritDoc} */
- public int mapChar(int glyphIndex, char unicode) {
- return mapCodePoint(glyphIndex, unicode);
- }
-
- /** {@inheritDoc} */
- public int mapCodePoint(int glyphIndex, int codePoint) {
- // 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 = usedGlyphs.get(glyphIndex);
- if (subsetCharSelector == null) {
- int selector = usedGlyphsCount;
- usedGlyphs.put(glyphIndex, selector);
- usedGlyphsIndex.put(selector, glyphIndex);
- usedCharsIndex.put(selector, codePoint);
- charToGIDs.put(codePoint, glyphIndex);
- usedGlyphsCount++;
- return selector;
- } else {
- return subsetCharSelector;
- }
- }
-
- /** {@inheritDoc} */
- public Map<Integer, Integer> getGlyphs() {
- return Collections.unmodifiableMap(this.usedGlyphs);
- }
-
- /** {@inheritDoc} */
- public char getUnicodeFromGID(int glyphIndex) {
- // TODO this method is never called in the MultiByte font path.
- // This is why we can safely cast the value of usedCharsIndex.get(selector)
- // to int . BTW is a question if it should be changed to int as getUnicode
- // or left like this.
- int selector = usedGlyphs.get(glyphIndex);
- return (char) usedCharsIndex.get(selector).intValue();
- }
-
- /** {@inheritDoc} */
- public int getGIDFromChar(char ch) {
- return charToGIDs.get((int) ch);
- }
-
- /** {@inheritDoc} */
- public char[] getChars() {
- StringBuilder buf = new StringBuilder();
-
- for (int i = 0; i < usedGlyphsCount; i++) {
- buf.appendCodePoint(getUnicode(i));
- }
-
- return buf.toString().toCharArray();
- }
-
- /** {@inheritDoc} */
- public int getNumberOfGlyphs() {
- return this.usedGlyphsCount;
- }
-
- /** {@inheritDoc} */
- public BitSet getGlyphIndices() {
- BitSet bitset = new BitSet();
- for (Integer cid : usedGlyphs.keySet()) {
- bitset.set(cid);
- }
- return bitset;
- }
-
- /** {@inheritDoc} */
- public int[] getWidths() {
- int[] widths = font.getWidths();
- int[] tmpWidth = new int[getNumberOfGlyphs()];
- for (int i = 0, c = getNumberOfGlyphs(); i < c; i++) {
- int nwx = Math.max(0, getOriginalGlyphIndex(i));
- tmpWidth[i] = widths[nwx];
- }
- return tmpWidth;
- }
-
- }
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