Java tutorial
/* * 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: RasterFont.java 1311638 2012-04-10 08:39:31Z mehdi $ */ package org.apache.fop.afp.fonts; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.SortedMap; import java.util.TreeMap; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * A font where each character is stored as an array of pixels (a bitmap). Such * fonts are not easily scalable, in contrast to vectored fonts. With this type * of font, the font metrics information is held in character set files (one for * each size and style). <p/> * */ public class RasterFont extends AFPFont { /** Static logging instance */ protected static final Log LOG = LogFactory.getLog("org.apache.fop.afp.fonts"); private final SortedMap<Integer, CharacterSet> charSets = new TreeMap<Integer, CharacterSet>(); private Map<Integer, CharacterSet> substitutionCharSets; private CharacterSet charSet = null; /** * Constructor for the raster font requires the name, weight and style * attribute to be available as this forms the key to the font. * * @param name * the name of the font */ public RasterFont(String name) { super(name); } /** * Adds the character set for the given point size * @param size point size (in mpt) * @param characterSet character set */ public void addCharacterSet(int size, CharacterSet characterSet) { //TODO: replace with Integer.valueOf() once we switch to Java 5 this.charSets.put(new Integer(size), characterSet); this.charSet = characterSet; } /** * Get the character set metrics for the specified point size. * * @param sizeInMpt the point size (in mpt) * @return the character set metrics */ public CharacterSet getCharacterSet(int sizeInMpt) { Integer requestedSize = Integer.valueOf(sizeInMpt); CharacterSet csm = (CharacterSet) charSets.get(requestedSize); double sizeInPt = sizeInMpt / 1000.0; if (csm != null) { return csm; } if (substitutionCharSets != null) { //Check first if a substitution has already been added csm = (CharacterSet) substitutionCharSets.get(requestedSize); } if (csm == null && !charSets.isEmpty()) { // No match or substitution found, but there exist entries // for other sizes // Get char set with nearest, smallest font size SortedMap<Integer, CharacterSet> smallerSizes = charSets.headMap(requestedSize); SortedMap<Integer, CharacterSet> largerSizes = charSets.tailMap(requestedSize); int smallerSize = smallerSizes.isEmpty() ? 0 : ((Integer) smallerSizes.lastKey()).intValue(); int largerSize = largerSizes.isEmpty() ? Integer.MAX_VALUE : ((Integer) largerSizes.firstKey()).intValue(); Integer fontSize; if (!smallerSizes.isEmpty() && (sizeInMpt - smallerSize) <= (largerSize - sizeInMpt)) { fontSize = Integer.valueOf(smallerSize); } else { fontSize = Integer.valueOf(largerSize); } csm = (CharacterSet) charSets.get(fontSize); if (csm != null) { // Add the substitute mapping, so subsequent calls will // find it immediately if (substitutionCharSets == null) { substitutionCharSets = new HashMap<Integer, CharacterSet>(); } substitutionCharSets.put(requestedSize, csm); // do not output the warning if the font size is closer to an integer less than 0.1 if (!(Math.abs(fontSize.intValue() / 1000.0 - sizeInPt) < 0.1)) { String msg = "No " + sizeInPt + "pt font " + getFontName() + " found, substituted with " + fontSize.intValue() / 1000f + "pt font"; LOG.warn(msg); } } } if (csm == null) { // Still no match -> error String msg = "No font found for font " + getFontName() + " with point size " + sizeInPt; LOG.error(msg); throw new FontRuntimeException(msg); } return csm; } /** * Get the first character in this font. * @return the first character in this font. */ public int getFirstChar() { Iterator<CharacterSet> it = charSets.values().iterator(); if (it.hasNext()) { CharacterSet csm = it.next(); return csm.getFirstChar(); } else { String msg = "getFirstChar() - No character set found for font:" + getFontName(); LOG.error(msg); throw new FontRuntimeException(msg); } } /** * Get the last character in this font. * @return the last character in this font. */ public int getLastChar() { Iterator<CharacterSet> it = charSets.values().iterator(); if (it.hasNext()) { CharacterSet csm = it.next(); return csm.getLastChar(); } else { String msg = "getLastChar() - No character set found for font:" + getFontName(); LOG.error(msg); throw new FontRuntimeException(msg); } } private int metricsToAbsoluteSize(CharacterSet cs, int value, int givenSize) { int nominalVerticalSize = cs.getNominalVerticalSize(); if (nominalVerticalSize != 0) { return value * nominalVerticalSize; } else { return value * givenSize; } } /** * The ascender is the part of a lowercase letter that extends above the * "x-height" (the height of the letter "x"), such as "d", "t", or "h". Also * used to denote the part of the letter extending above the x-height. * * @param size the font size (in mpt) * @return the ascender for the given point size */ public int getAscender(int size) { CharacterSet cs = getCharacterSet(size); return metricsToAbsoluteSize(cs, cs.getAscender(), size); } /** * Obtains the height of capital letters for the specified point size. * * @param size the font size (in mpt) * @return the cap height for the specified point size */ public int getCapHeight(int size) { CharacterSet cs = getCharacterSet(size); return metricsToAbsoluteSize(cs, cs.getCapHeight(), size); } /** * The descender is the part of a lowercase letter that extends below the * base line, such as "g", "j", or "p". Also used to denote the part of the * letter extending below the base line. * * @param size the font size (in mpt) * @return the descender for the specified point size */ public int getDescender(int size) { CharacterSet cs = getCharacterSet(size); return metricsToAbsoluteSize(cs, cs.getDescender(), size); } /** * The "x-height" (the height of the letter "x"). * * @param size the font size (in mpt) * @return the x height for the given point size */ public int getXHeight(int size) { CharacterSet cs = getCharacterSet(size); return metricsToAbsoluteSize(cs, cs.getXHeight(), size); } /** * Obtain the width of the character for the specified point size. * @param character the character * @param size the font size (in mpt) * @return the width for the given point size */ public int getWidth(int character, int size) { CharacterSet cs = getCharacterSet(size); return metricsToAbsoluteSize(cs, cs.getWidth(toUnicodeCodepoint(character)), size); } /** * Get the getWidth (in 1/1000ths of a point size) of all characters in this * character set. * * @param size the font size (in mpt) * @return the widths of all characters */ public int[] getWidths(int size) { CharacterSet cs = getCharacterSet(size); int[] widths = cs.getWidths(); for (int i = 0, c = widths.length; i < c; i++) { widths[i] = metricsToAbsoluteSize(cs, widths[i], size); } return widths; } /** * Get the getWidth (in 1/1000ths of a point size) of all characters in this * character set. * * @return the widths of all characters */ public int[] getWidths() { return getWidths(1000); } /** {@inheritDoc} */ public boolean hasChar(char c) { return charSet.hasChar(c); } /** * Map a Unicode character to a code point in the font. * @param c character to map * @return the mapped character */ public char mapChar(char c) { return charSet.mapChar(c); } /** {@inheritDoc} */ public String getEncodingName() { return charSet.getEncoding(); } }