| /* |
| * 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.afp.fonts; |
| |
| import java.awt.Rectangle; |
| import java.lang.Character.UnicodeBlock; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import org.apache.fop.afp.AFPEventProducer; |
| |
| /** |
| * Implementation of AbstractOutlineFont that supports double-byte fonts (CID Keyed font (Type 0)). |
| * The width of characters that are not prescribed a width metrics in the font resource use |
| * a fallback width. The default width is 1 em. A character can be supplied and queried for the |
| * fallback width of all non-ideograph characters.<p /> |
| */ |
| public class DoubleByteFont extends AbstractOutlineFont { |
| |
| private static final Log log = LogFactory.getLog(DoubleByteFont.class); |
| |
| private final Set<Integer> charsProcessed; |
| |
| //See also http://unicode.org/reports/tr11/ which we've not closely looked at, yet |
| //TODO the Unicode block listed here is probably not complete (ex. Hiragana, Katakana etc.) |
| private static final Set<UnicodeBlock> IDEOGRAPHIC = new HashSet<UnicodeBlock>(); |
| static { |
| IDEOGRAPHIC.add(Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS); |
| //IDEOGRAPHIC.add(Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT);//Java 1.5 |
| IDEOGRAPHIC.add(Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS); |
| IDEOGRAPHIC.add(Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A); |
| //IDEOGRAPHIC.add(Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B); //Java 1.1 |
| } |
| |
| /** |
| * Constructor for an double-byte outline font. |
| * @param name the name of the font |
| * @param embeddable whether or not this font is embeddable |
| * @param charSet the character set |
| * @param eventProducer Handles any AFP related events |
| */ |
| public DoubleByteFont(String name, boolean embeddable, CharacterSet charSet, |
| AFPEventProducer eventProducer) { |
| super(name, embeddable, charSet, eventProducer); |
| charsProcessed = new HashSet<Integer>(); |
| } |
| |
| /** {@inheritDoc} */ |
| public int getWidth(int character, int size) { |
| int charWidth; |
| try { |
| charWidth = charSet.getWidth(toUnicodeCodepoint(character), size); |
| } catch (IllegalArgumentException e) { |
| if (!charsProcessed.contains(character)) { |
| charsProcessed.add(character); |
| getAFPEventProducer().charactersetMissingMetrics(this, (char)character, |
| charSet.getName().trim()); |
| } |
| // We shall try and handle characters that have no mapped width metric in font resource |
| charWidth = -1; |
| } |
| |
| if (charWidth == -1) { |
| charWidth = getDefaultCharacterWidth(character) * size; |
| } |
| return charWidth; |
| } |
| |
| private int getDefaultCharacterWidth(int character) { |
| int nominalCharIncrement = charSet.getNominalCharIncrement(); |
| if (nominalCharIncrement > 0) { |
| return nominalCharIncrement; |
| } else { |
| return inferCharWidth(character); |
| } |
| } |
| |
| @Override |
| public Rectangle getBoundingBox(int character, int size) { |
| Rectangle characterBox = getBoundingBoxOrNull(character, size); |
| if (characterBox == null) { |
| characterBox = getDefaultCharacterBox(character, size); |
| } |
| return characterBox; |
| } |
| |
| private Rectangle getBoundingBoxOrNull(int character, int size) { |
| Rectangle characterBox = null; |
| try { |
| characterBox = charSet.getCharacterBox(toUnicodeCodepoint(character), size); |
| } catch (IllegalArgumentException e) { |
| if (!charsProcessed.contains(character)) { |
| charsProcessed.add(character); |
| getAFPEventProducer().charactersetMissingMetrics(this, (char) character, |
| charSet.getName().trim()); |
| } |
| } |
| return characterBox; |
| } |
| |
| private Rectangle getDefaultCharacterBox(int character, int size) { |
| return getBoundingBoxOrNull('-', size); |
| } |
| |
| private int inferCharWidth(int character) { |
| |
| //Is this character an ideograph? |
| boolean isIdeographic = false; |
| Character.UnicodeBlock charBlock = Character.UnicodeBlock.of((char)character); |
| if (charBlock == null) { |
| isIdeographic = false; |
| } else if (IDEOGRAPHIC.contains(charBlock)) { |
| isIdeographic = true; |
| } else { //default |
| isIdeographic = false; |
| } |
| |
| if (isIdeographic) { |
| return charSet.getEmSpaceIncrement(); |
| } else { |
| return charSet.getSpaceIncrement(); |
| } |
| } |
| |
| } |