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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.afp.fonts;
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));
} 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);
}
return charWidth * size;
}
private int getDefaultCharacterWidth(int character) {
int nominalCharIncrement = charSet.getNominalCharIncrement();
if (nominalCharIncrement > 0) {
return nominalCharIncrement;
} else {
return inferCharWidth(character);
}
}
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();
}
}
}
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