/*
* 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: FontInfoFinder.java 787668 2009-06-23 13:18:44Z acumiskey $ */
package org.apache.fop.fonts.autodetect;
import java.io.InputStream;
import java.net.URL;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;
import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.fonts.CustomFont;
import org.apache.fop.fonts.EmbedFontInfo;
import org.apache.fop.fonts.EncodingMode;
import org.apache.fop.fonts.Font;
import org.apache.fop.fonts.FontCache;
import org.apache.fop.fonts.FontEventListener;
import org.apache.fop.fonts.FontLoader;
import org.apache.fop.fonts.FontResolver;
import org.apache.fop.fonts.FontTriplet;
import org.apache.fop.fonts.FontUtil;
import org.apache.fop.fonts.MultiByteFont;
import org.apache.fop.fonts.truetype.FontFileReader;
import org.apache.fop.fonts.truetype.TTFFile;
import org.apache.fop.fonts.truetype.TTFFontLoader;
/**
* Attempts to determine correct FontInfo
*/
public class FontInfoFinder {
/** logging instance */
private Log log = LogFactory.getLog(FontInfoFinder.class);
private FontEventListener eventListener;
/**
* Sets the font event listener that can be used to receive events about particular events
* in this class.
* @param listener the font event listener
*/
public void setEventListener(FontEventListener listener) {
this.eventListener = listener;
}
/**
* Attempts to determine FontTriplets from a given CustomFont.
* It seems to be fairly accurate but will probably require some tweaking over time
*
* @param customFont CustomFont
* @param triplet Collection that will take the generated triplets
*/
private void generateTripletsFromFont(CustomFont customFont, Collection triplets) {
if (log.isTraceEnabled()) {
log.trace("Font: " + customFont.getFullName()
+ ", family: " + customFont.getFamilyNames()
+ ", PS: " + customFont.getFontName()
+ ", EmbedName: " + customFont.getEmbedFontName());
}
// default style and weight triplet vales (fallback)
String strippedName = stripQuotes(customFont.getStrippedFontName());
//String subName = customFont.getFontSubName();
String fullName = stripQuotes(customFont.getFullName());
String searchName = fullName.toLowerCase();
String style = guessStyle(customFont, searchName);
int weight; //= customFont.getWeight();
int guessedWeight = FontUtil.guessWeight(searchName);
//We always take the guessed weight for now since it yield much better results.
//OpenType's OS/2 usWeightClass value proves to be unreliable.
weight = guessedWeight;
//Full Name usually includes style/weight info so don't use these traits
//If we still want to use these traits, we have to make FontInfo.fontLookup() smarter
triplets.add(new FontTriplet(fullName, Font.STYLE_NORMAL, Font.WEIGHT_NORMAL));
if (!fullName.equals(strippedName)) {
triplets.add(new FontTriplet(strippedName, Font.STYLE_NORMAL, Font.WEIGHT_NORMAL));
}
Set familyNames = customFont.getFamilyNames();
Iterator iter = familyNames.iterator();
while (iter.hasNext()) {
String familyName = stripQuotes((String)iter.next());
if (!fullName.equals(familyName)) {
/* Heuristic:
* The more similar the family name to the full font name,
* the higher the priority of its triplet.
* (Lower values indicate higher priorities.) */
int priority = fullName.startsWith(familyName)
? fullName.length() - familyName.length()
: fullName.length();
triplets.add(new FontTriplet(familyName, style, weight, priority));
}
}
}
private final Pattern quotePattern = Pattern.compile("'");
private String stripQuotes(String name) {
return quotePattern.matcher(name).replaceAll("");
}
private String guessStyle(CustomFont customFont, String fontName) {
// style
String style = Font.STYLE_NORMAL;
if (customFont.getItalicAngle() > 0) {
style = Font.STYLE_ITALIC;
} else {
style = FontUtil.guessStyle(fontName);
}
return style;
}
/**
* Attempts to determine FontInfo from a given custom font
* @param fontUrl the font URL
* @param customFont the custom font
* @param fontCache font cache (may be null)
* @return
*/
private EmbedFontInfo getFontInfoFromCustomFont(
URL fontUrl, CustomFont customFont, FontCache fontCache) {
List fontTripletList = new java.util.ArrayList();
generateTripletsFromFont(customFont, fontTripletList);
String embedUrl;
embedUrl = fontUrl.toExternalForm();
String subFontName = null;
if (customFont instanceof MultiByteFont) {
subFontName = ((MultiByteFont)customFont).getTTCName();
}
EmbedFontInfo fontInfo = new EmbedFontInfo(null, customFont.isKerningEnabled(),
fontTripletList, embedUrl, subFontName);
fontInfo.setPostScriptName(customFont.getFontName());
if (fontCache != null) {
fontCache.addFont(fontInfo);
}
return fontInfo;
}
/**
* Attempts to determine EmbedFontInfo from a given font file.
*
* @param fontUrl font URL. Assumed to be local.
* @param resolver font resolver used to resolve font
* @param fontCache font cache (may be null)
* @return an array of newly created embed font info. Generally, this array
* will have only one entry, unless the fontUrl is a TrueType Collection
*/
public EmbedFontInfo[] find(URL fontUrl, FontResolver resolver, FontCache fontCache) {
String embedUrl = null;
embedUrl = fontUrl.toExternalForm();
long fileLastModified = -1;
if (fontCache != null) {
fileLastModified = FontCache.getLastModified(fontUrl);
// firstly try and fetch it from cache before loading/parsing the font file
if (fontCache.containsFont(embedUrl)) {
EmbedFontInfo[] fontInfos = fontCache.getFontInfos(embedUrl, fileLastModified);
if (fontInfos != null) {
return fontInfos;
}
// is this a previously failed parsed font?
} else if (fontCache.isFailedFont(embedUrl, fileLastModified)) {
if (log.isDebugEnabled()) {
log.debug("Skipping font file that failed to load previously: " + embedUrl);
}
return null;
}
}
// try to determine triplet information from font file
CustomFont customFont = null;
if (fontUrl.toExternalForm().endsWith(".ttc")) {
// Get a list of the TTC Font names
List ttcNames = null; //List<String>
String fontFileURI = fontUrl.toExternalForm().trim();
InputStream in = null;
try {
in = FontLoader.openFontUri(resolver, fontFileURI);
TTFFile ttf = new TTFFile();
FontFileReader reader = new FontFileReader(in);
ttcNames = ttf.getTTCnames(reader);
} catch (Exception e) {
if (this.eventListener != null) {
this.eventListener.fontLoadingErrorAtAutoDetection(this, fontFileURI, e);
}
return null;
} finally {
IOUtils.closeQuietly(in);
}
List/*<EmbedFontInfo>*/ embedFontInfoList
= new java.util.ArrayList/*<EmbedFontInfo>*/();
// For each font name ...
//for (String fontName : ttcNames) {
Iterator ttcNamesIterator = ttcNames.iterator();
while (ttcNamesIterator.hasNext()) {
String fontName = (String)ttcNamesIterator.next();
if (log.isDebugEnabled()) {
log.debug("Loading " + fontName);
}
try {
TTFFontLoader ttfLoader = new TTFFontLoader(
fontFileURI, fontName, true, EncodingMode.AUTO, true, resolver);
customFont = ttfLoader.getFont();
if (this.eventListener != null) {
customFont.setEventListener(this.eventListener);
}
} catch (Exception e) {
if (fontCache != null) {
fontCache.registerFailedFont(embedUrl, fileLastModified);
}
if (this.eventListener != null) {
this.eventListener.fontLoadingErrorAtAutoDetection(this, embedUrl, e);
}
continue;
}
EmbedFontInfo fi = getFontInfoFromCustomFont(fontUrl, customFont, fontCache);
if (fi != null) {
embedFontInfoList.add(fi);
}
}
return (EmbedFontInfo[])embedFontInfoList.toArray(
new EmbedFontInfo[embedFontInfoList.size()]);
} else {
// The normal case
try {
customFont = FontLoader.loadFont(fontUrl, null, true, EncodingMode.AUTO, resolver);
if (this.eventListener != null) {
customFont.setEventListener(this.eventListener);
}
} catch (Exception e) {
if (fontCache != null) {
fontCache.registerFailedFont(embedUrl, fileLastModified);
}
if (this.eventListener != null) {
this.eventListener.fontLoadingErrorAtAutoDetection(this, embedUrl, e);
}
return null;
}
EmbedFontInfo fi = getFontInfoFromCustomFont(fontUrl, customFont, fontCache);
if (fi != null) {
return new EmbedFontInfo[] {fi};
} else {
return null;
}
}
}
}