/*
* 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: Type1FontLoader.java 1293736 2012-02-26 02:29:01Z gadams $ */
package org.apache.fop.fonts.type1;
import java.awt.geom.RectangularShape;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.commons.io.IOUtils;
import org.apache.fop.fonts.CodePointMapping;
import org.apache.fop.fonts.FontLoader;
import org.apache.fop.fonts.FontResolver;
import org.apache.fop.fonts.FontType;
import org.apache.fop.fonts.SingleByteEncoding;
import org.apache.fop.fonts.SingleByteFont;
/**
* Loads a Type 1 font into memory directly from the original font file.
*/
public class Type1FontLoader extends FontLoader {
private SingleByteFont singleFont;
/**
* Constructs a new Type 1 font loader.
* @param fontFileURI the URI to the PFB file of a Type 1 font
* @param embedded indicates whether the font is embedded or referenced
* @param useKerning indicates whether to load kerning information if available
* @param resolver the font resolver used to resolve URIs
* @throws IOException In case of an I/O error
*/
public Type1FontLoader(String fontFileURI, boolean embedded, boolean useKerning,
FontResolver resolver) throws IOException {
super(fontFileURI, embedded, useKerning, true, resolver);
}
private String getPFMURI(String pfbURI) {
String pfbExt = pfbURI.substring(pfbURI.length() - 3, pfbURI.length());
String pfmExt = pfbExt.substring(0, 2)
+ (Character.isUpperCase(pfbExt.charAt(2)) ? "M" : "m");
return pfbURI.substring(0, pfbURI.length() - 4) + "." + pfmExt;
}
private static final String[] AFM_EXTENSIONS = new String[] {".AFM", ".afm", ".Afm"};
/** {@inheritDoc} */
@Override
protected void read() throws IOException {
AFMFile afm = null;
PFMFile pfm = null;
InputStream afmIn = null;
String afmUri = null;
for (int i = 0; i < AFM_EXTENSIONS.length; i++) {
try {
afmUri = this.fontFileURI.substring(0, this.fontFileURI.length() - 4)
+ AFM_EXTENSIONS[i];
afmIn = openFontUri(resolver, afmUri);
if (afmIn != null) {
break;
}
} catch (IOException ioe) {
// Ignore, AFM probably not available under the URI
}
}
if (afmIn != null) {
try {
AFMParser afmParser = new AFMParser();
afm = afmParser.parse(afmIn, afmUri);
} finally {
IOUtils.closeQuietly(afmIn);
}
}
String pfmUri = getPFMURI(this.fontFileURI);
InputStream pfmIn = null;
try {
pfmIn = openFontUri(resolver, pfmUri);
} catch (IOException ioe) {
// Ignore, PFM probably not available under the URI
}
if (pfmIn != null) {
try {
pfm = new PFMFile();
pfm.load(pfmIn);
} catch (IOException ioe) {
if (afm == null) {
// Ignore the exception if we have a valid PFM. PFM is only the fallback.
throw ioe;
}
} finally {
IOUtils.closeQuietly(pfmIn);
}
}
if (afm == null && pfm == null) {
throw new java.io.FileNotFoundException(
"Neither an AFM nor a PFM file was found for " + this.fontFileURI);
}
buildFont(afm, pfm);
this.loaded = true;
}
private void buildFont(AFMFile afm, PFMFile pfm) {
if (afm == null && pfm == null) {
throw new IllegalArgumentException("Need at least an AFM or a PFM!");
}
singleFont = new SingleByteFont();
singleFont.setFontType(FontType.TYPE1);
singleFont.setResolver(this.resolver);
if (this.embedded) {
singleFont.setEmbedFileName(this.fontFileURI);
}
returnFont = singleFont;
handleEncoding(afm, pfm);
handleFontName(afm, pfm);
handleMetrics(afm, pfm);
}
private void handleEncoding(AFMFile afm, PFMFile pfm) {
// Encoding
if (afm != null) {
String encoding = afm.getEncodingScheme();
singleFont.setUseNativeEncoding(true);
if ("AdobeStandardEncoding".equals(encoding)) {
singleFont.setEncoding(CodePointMapping.STANDARD_ENCODING);
addUnencodedBasedOnEncoding(afm);
} else {
String effEncodingName;
if ("FontSpecific".equals(encoding)) {
effEncodingName = afm.getFontName() + "Encoding";
} else {
effEncodingName = encoding;
}
if (log.isDebugEnabled()) {
log.debug("Unusual font encoding encountered: "
+ encoding + " -> " + effEncodingName);
}
CodePointMapping mapping = buildCustomEncoding(effEncodingName, afm);
singleFont.setEncoding(mapping);
addUnencodedBasedOnAFM(afm);
}
} else {
if (pfm.getCharSet() >= 0 && pfm.getCharSet() <= 2) {
singleFont.setEncoding(pfm.getCharSetName() + "Encoding");
} else {
log.warn("The PFM reports an unsupported encoding ("
+ pfm.getCharSetName() + "). The font may not work as expected.");
singleFont.setEncoding("WinAnsiEncoding"); // Try fallback, no guarantees!
}
}
}
private Set<String> toGlyphSet(String[] glyphNames) {
Set<String> glyphSet = new java.util.HashSet<String>();
for (String name : glyphNames) {
glyphSet.add(name);
}
return glyphSet;
}
/**
* Adds characters not encoded in the font's primary encoding. This method is used when we
* don't trust the AFM to expose the same encoding as the primary font.
* @param afm the AFM file.
*/
private void addUnencodedBasedOnEncoding(AFMFile afm) {
SingleByteEncoding encoding = singleFont.getEncoding();
Set<String> glyphNames = toGlyphSet(encoding.getCharNameMap());
List<AFMCharMetrics> charMetrics = afm.getCharMetrics();
for (AFMCharMetrics metrics : charMetrics) {
String charName = metrics.getCharName();
if (charName != null && !glyphNames.contains(charName)) {
singleFont.addUnencodedCharacter(metrics.getCharacter(),
(int)Math.round(metrics.getWidthX()));
}
}
}
/**
* Adds characters not encoded in the font's primary encoding. This method is used when
* the primary encoding is built based on the character codes in the AFM rather than
* the specified encoding (ex. with symbolic fonts).
* @param afm the AFM file
*/
private void addUnencodedBasedOnAFM(AFMFile afm) {
List charMetrics = afm.getCharMetrics();
for (int i = 0, c = afm.getCharCount(); i < c; i++) {
AFMCharMetrics metrics = (AFMCharMetrics)charMetrics.get(i);
if (!metrics.hasCharCode() && metrics.getCharacter() != null) {
singleFont.addUnencodedCharacter(metrics.getCharacter(),
(int)Math.round(metrics.getWidthX()));
}
}
}
private void handleFontName(AFMFile afm, PFMFile pfm) {
// Font name
if (afm != null) {
returnFont.setFontName(afm.getFontName()); // PostScript font name
returnFont.setFullName(afm.getFullName());
Set<String> names = new HashSet<String>();
names.add(afm.getFamilyName());
returnFont.setFamilyNames(names);
} else {
returnFont.setFontName(pfm.getPostscriptName());
String fullName = pfm.getPostscriptName();
fullName = fullName.replace('-', ' '); // Hack! Try to emulate full name
returnFont.setFullName(fullName); // emulate afm.getFullName()
Set<String> names = new HashSet<String>();
names.add(pfm.getWindowsName()); // emulate afm.getFamilyName()
returnFont.setFamilyNames(names);
}
}
private void handleMetrics(AFMFile afm, PFMFile pfm) {
// Basic metrics
if (afm != null) {
if (afm.getCapHeight() != null) {
returnFont.setCapHeight(afm.getCapHeight().intValue());
}
if (afm.getXHeight() != null) {
returnFont.setXHeight(afm.getXHeight().intValue());
}
if (afm.getAscender() != null) {
returnFont.setAscender(afm.getAscender().intValue());
}
if (afm.getDescender() != null) {
returnFont.setDescender(afm.getDescender().intValue());
}
returnFont.setFontBBox(afm.getFontBBoxAsIntArray());
if (afm.getStdVW() != null) {
returnFont.setStemV(afm.getStdVW().intValue());
} else {
returnFont.setStemV(80); // Arbitrary value
}
returnFont.setItalicAngle((int) afm.getWritingDirectionMetrics(0).getItalicAngle());
} else {
returnFont.setFontBBox(pfm.getFontBBox());
returnFont.setStemV(pfm.getStemV());
returnFont.setItalicAngle(pfm.getItalicAngle());
}
if (pfm != null) {
// Sometimes the PFM has these metrics while the AFM doesn't (ex. Symbol)
if (returnFont.getCapHeight() == 0) {
returnFont.setCapHeight(pfm.getCapHeight());
}
if (returnFont.getXHeight(1) == 0) {
returnFont.setXHeight(pfm.getXHeight());
}
if (returnFont.getAscender() == 0) {
returnFont.setAscender(pfm.getLowerCaseAscent());
}
if (returnFont.getDescender() == 0) {
returnFont.setDescender(pfm.getLowerCaseDescent());
}
}
// Fallbacks when some crucial font metrics aren't available
// (the following are all optional in AFM, but FontBBox is always available)
if (returnFont.getXHeight(1) == 0) {
int xHeight = 0;
if (afm != null) {
AFMCharMetrics chm = afm.getChar("x");
if (chm != null) {
RectangularShape rect = chm.getBBox();
if (rect != null) {
xHeight = (int) Math.round(rect.getMinX());
}
}
}
if (xHeight == 0) {
xHeight = Math.round(returnFont.getFontBBox()[3] * 0.6f);
}
returnFont.setXHeight(xHeight);
}
if (returnFont.getAscender() == 0) {
int asc = 0;
if (afm != null) {
AFMCharMetrics chm = afm.getChar("d");
if (chm != null) {
RectangularShape rect = chm.getBBox();
if (rect != null) {
asc = (int) Math.round(rect.getMinX());
}
}
}
if (asc == 0) {
asc = Math.round(returnFont.getFontBBox()[3] * 0.9f);
}
returnFont.setAscender(asc);
}
if (returnFont.getDescender() == 0) {
int desc = 0;
if (afm != null) {
AFMCharMetrics chm = afm.getChar("p");
if (chm != null) {
RectangularShape rect = chm.getBBox();
if (rect != null) {
desc = (int) Math.round(rect.getMinX());
}
}
}
if (desc == 0) {
desc = returnFont.getFontBBox()[1];
}
returnFont.setDescender(desc);
}
if (returnFont.getCapHeight() == 0) {
returnFont.setCapHeight(returnFont.getAscender());
}
if (afm != null) {
String charSet = afm.getCharacterSet();
int flags = 0;
if ("Special".equals(charSet)) {
flags |= 4; // bit 3: Symbolic
} else {
if (singleFont.getEncoding().mapChar('A') == 'A') {
// High likelyhood that the font is non-symbolic
flags |= 32; // bit 6: Nonsymbolic
} else {
flags |= 4; // bit 3: Symbolic
}
}
if (afm.getWritingDirectionMetrics(0).isFixedPitch()) {
flags |= 1; // bit 1: FixedPitch
}
if (afm.getWritingDirectionMetrics(0).getItalicAngle() != 0.0) {
flags |= 64; // bit 7: Italic
}
returnFont.setFlags(flags);
returnFont.setFirstChar(afm.getFirstChar());
returnFont.setLastChar(afm.getLastChar());
for (AFMCharMetrics chm : afm.getCharMetrics()) {
if (chm.hasCharCode()) {
singleFont.setWidth(chm.getCharCode(), (int) Math.round(chm.getWidthX()));
}
}
if (useKerning) {
returnFont.replaceKerningMap(afm.createXKerningMapEncoded());
}
} else {
returnFont.setFlags(pfm.getFlags());
returnFont.setFirstChar(pfm.getFirstChar());
returnFont.setLastChar(pfm.getLastChar());
for (short i = pfm.getFirstChar(); i <= pfm.getLastChar(); i++) {
singleFont.setWidth(i, pfm.getCharWidth(i));
}
if (useKerning) {
returnFont.replaceKerningMap(pfm.getKerning());
}
}
}
private CodePointMapping buildCustomEncoding(String encodingName, AFMFile afm) {
int mappingCount = 0;
// Just count the first time...
List<AFMCharMetrics> chars = afm.getCharMetrics();
for (AFMCharMetrics charMetrics : chars) {
if (charMetrics.getCharCode() >= 0) {
String u = charMetrics.getUnicodeSequence();
if (u != null && u.length() == 1) {
mappingCount++;
}
}
}
// ...and now build the table.
int[] table = new int[mappingCount * 2];
String[] charNameMap = new String[256];
int idx = 0;
for (AFMCharMetrics charMetrics : chars) {
if (charMetrics.getCharCode() >= 0) {
charNameMap[charMetrics.getCharCode()] = charMetrics.getCharName();
String unicodes = charMetrics.getUnicodeSequence();
if (unicodes == null) {
log.info("No Unicode mapping for glyph: " + charMetrics);
} else if (unicodes.length() == 1) {
table[idx] = charMetrics.getCharCode();
idx++;
table[idx] = unicodes.charAt(0);
idx++;
} else {
log.warn("Multi-character representation of glyph not currently supported: "
+ charMetrics);
}
}
}
return new CodePointMapping(encodingName, table, charNameMap);
}
}