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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.util.Set;
-
- /**
- * 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);
-
- //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 IDEOGRAPHIC = new java.util.HashSet();
- 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 charSet the character set
- */
- public DoubleByteFont(String name, CharacterSet charSet) {
- super(name, charSet);
- }
-
- /** {@inheritDoc} */
- public int getWidth(int character, int size) {
- int charWidth;
- try {
- charWidth = charSet.getWidth(toUnicodeCodepoint(character));
- } catch (IllegalArgumentException e) {
- // We shall try and handle characters that have no mapped width metric in font resource
- charWidth = -1;
- }
-
- if (charWidth == -1) {
- charWidth = inferCharWidth(character);
- }
- return charWidth * 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();
- }
- }
-
- }
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