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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.fonts;
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.URI;
- import java.util.Map;
- import java.util.Set;
-
- import org.xml.sax.InputSource;
-
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
-
- import org.apache.fop.apps.FOPException;
- import org.apache.fop.apps.io.InternalResourceResolver;
- import org.apache.fop.complexscripts.fonts.Positionable;
- import org.apache.fop.complexscripts.fonts.Substitutable;
-
- /**
- * This class is used to defer the loading of a font until it is really used.
- */
- public class LazyFont extends Typeface implements FontDescriptor, Substitutable, Positionable {
-
- private static Log log = LogFactory.getLog(LazyFont.class);
-
- private final URI metricsURI;
- private final URI fontEmbedURI;
- private final boolean useKerning;
- private final boolean useAdvanced;
- private final EncodingMode encodingMode;
- private final boolean embedded;
- private final String subFontName;
- private final InternalResourceResolver resourceResolver;
-
- private boolean isMetricsLoaded;
- private Typeface realFont;
- private FontDescriptor realFontDescriptor;
-
- /**
- * Main constructor
- * @param fontInfo the font info to embed
- * @param resourceResolver the font resolver to handle font URIs
- */
- public LazyFont(EmbedFontInfo fontInfo, InternalResourceResolver resourceResolver,
- boolean useComplexScripts) {
- this.metricsURI = fontInfo.getMetricsURI();
- this.fontEmbedURI = fontInfo.getEmbedURI();
- this.useKerning = fontInfo.getKerning();
- if (resourceResolver != null) {
- this.useAdvanced = useComplexScripts;
- } else {
- this.useAdvanced = fontInfo.getAdvanced();
- }
- this.encodingMode = fontInfo.getEncodingMode() != null ? fontInfo.getEncodingMode()
- : EncodingMode.AUTO;
- this.subFontName = fontInfo.getSubFontName();
- this.embedded = fontInfo.isEmbedded();
- this.resourceResolver = resourceResolver;
- }
-
- /** {@inheritDoc} */
- public String toString() {
- StringBuffer sbuf = new StringBuffer(super.toString());
- sbuf.append('{');
- sbuf.append("metrics-url=" + metricsURI);
- sbuf.append(",embed-url=" + fontEmbedURI);
- sbuf.append(",kerning=" + useKerning);
- sbuf.append(",advanced=" + useAdvanced);
- sbuf.append('}');
- return sbuf.toString();
- }
-
- private void load(boolean fail) {
- if (!isMetricsLoaded) {
- try {
- if (metricsURI != null) {
- /**@todo Possible thread problem here */
- FontReader reader = null;
- InputStream in = resourceResolver.getResource(metricsURI);
- InputSource src = new InputSource(in);
- src.setSystemId(metricsURI.toASCIIString());
- reader = new FontReader(src, resourceResolver);
- reader.setKerningEnabled(useKerning);
- reader.setAdvancedEnabled(useAdvanced);
- if (this.embedded) {
- reader.setFontEmbedURI(fontEmbedURI);
- }
- realFont = reader.getFont();
- } else {
- if (fontEmbedURI == null) {
- throw new RuntimeException("Cannot load font. No font URIs available.");
- }
- realFont = FontLoader.loadFont(fontEmbedURI, this.subFontName,
- this.embedded, this.encodingMode, useKerning, useAdvanced, resourceResolver);
- }
- if (realFont instanceof FontDescriptor) {
- realFontDescriptor = (FontDescriptor) realFont;
- }
- } catch (FOPException fopex) {
- log.error("Failed to read font metrics file " + metricsURI, fopex);
- if (fail) {
- throw new RuntimeException(fopex);
- }
- } catch (IOException ioex) {
- log.error("Failed to read font metrics file " + metricsURI, ioex);
- if (fail) {
- throw new RuntimeException(ioex);
- }
- }
- realFont.setEventListener(this.eventListener);
- isMetricsLoaded = true;
- }
- }
-
- /**
- * Gets the real font.
- * @return the real font
- */
- public Typeface getRealFont() {
- load(false);
- return realFont;
- }
-
- // ---- Font ----
- /** {@inheritDoc} */
- public String getEncodingName() {
- load(true);
- return realFont.getEncodingName();
- }
-
- /**
- * {@inheritDoc}
- */
- public char mapChar(char c) {
- load(true);
- return realFont.mapChar(c);
- }
-
- /**
- * {@inheritDoc}
- */
- public boolean hadMappingOperations() {
- load(true);
- return realFont.hadMappingOperations();
- }
-
- /**
- * {@inheritDoc}
- */
- public boolean hasChar(char c) {
- load(true);
- return realFont.hasChar(c);
- }
-
- /**
- * {@inheritDoc}
- */
- public boolean isMultiByte() {
- load(true);
- return realFont.isMultiByte();
- }
-
- // ---- FontMetrics interface ----
- /** {@inheritDoc} */
- public String getFontName() {
- load(true);
- return realFont.getFontName();
- }
-
- /** {@inheritDoc} */
- public String getEmbedFontName() {
- load(true);
- return realFont.getEmbedFontName();
- }
-
- /** {@inheritDoc} */
- public String getFullName() {
- load(true);
- return realFont.getFullName();
- }
-
- /** {@inheritDoc} */
- public Set<String> getFamilyNames() {
- load(true);
- return realFont.getFamilyNames();
- }
-
- /**
- * {@inheritDoc}
- */
- public int getMaxAscent(int size) {
- load(true);
- return realFont.getMaxAscent(size);
- }
-
- /**
- * {@inheritDoc}
- */
- public int getAscender(int size) {
- load(true);
- return realFont.getAscender(size);
- }
-
- /**
- * {@inheritDoc}
- */
- public int getCapHeight(int size) {
- load(true);
- return realFont.getCapHeight(size);
- }
-
- /**
- * {@inheritDoc}
- */
- public int getDescender(int size) {
- load(true);
- return realFont.getDescender(size);
- }
-
- /**
- * {@inheritDoc}
- */
- public int getXHeight(int size) {
- load(true);
- return realFont.getXHeight(size);
- }
-
- /**
- * {@inheritDoc}
- */
- public int getWidth(int i, int size) {
- load(true);
- return realFont.getWidth(i, size);
- }
-
- /**
- * {@inheritDoc}
- */
- public int[] getWidths() {
- load(true);
- return realFont.getWidths();
- }
-
- /**
- * {@inheritDoc}
- */
- public boolean hasKerningInfo() {
- load(true);
- return realFont.hasKerningInfo();
- }
-
- /**
- * {@inheritDoc}
- */
- public Map<Integer, Map<Integer, Integer>> getKerningInfo() {
- load(true);
- return realFont.getKerningInfo();
- }
-
- // ---- FontDescriptor interface ----
- /**
- * {@inheritDoc}
- */
- public int getCapHeight() {
- load(true);
- return realFontDescriptor.getCapHeight();
- }
-
- /**
- * {@inheritDoc}
- */
- public int getDescender() {
- load(true);
- return realFontDescriptor.getDescender();
- }
-
- /**
- * {@inheritDoc}
- */
- public int getAscender() {
- load(true);
- return realFontDescriptor.getAscender();
- }
-
- /** {@inheritDoc} */
- public int getFlags() {
- load(true);
- return realFontDescriptor.getFlags();
- }
-
- /** {@inheritDoc} */
- public boolean isSymbolicFont() {
- load(true);
- return realFontDescriptor.isSymbolicFont();
- }
-
- /**
- * {@inheritDoc}
- */
- public int[] getFontBBox() {
- load(true);
- return realFontDescriptor.getFontBBox();
- }
-
- /**
- * {@inheritDoc}
- */
- public int getItalicAngle() {
- load(true);
- return realFontDescriptor.getItalicAngle();
- }
-
- /**
- * {@inheritDoc}
- */
- public int getStemV() {
- load(true);
- return realFontDescriptor.getStemV();
- }
-
- /**
- * {@inheritDoc}
- */
- public FontType getFontType() {
- load(true);
- return realFontDescriptor.getFontType();
- }
-
- /**
- * {@inheritDoc}
- */
- public boolean isEmbeddable() {
- load(true);
- return realFontDescriptor.isEmbeddable();
- }
-
- /**
- * {@inheritDoc}
- */
- public boolean performsSubstitution() {
- load(true);
- if ( realFontDescriptor instanceof Substitutable ) {
- return ((Substitutable)realFontDescriptor).performsSubstitution();
- } else {
- return false;
- }
- }
-
- /**
- * {@inheritDoc}
- */
- public CharSequence performSubstitution ( CharSequence cs, String script, String language ) {
- load(true);
- if ( realFontDescriptor instanceof Substitutable ) {
- return ((Substitutable)realFontDescriptor).performSubstitution(cs, script, language);
- } else {
- return cs;
- }
- }
-
- /**
- * {@inheritDoc}
- */
- public CharSequence reorderCombiningMarks
- ( CharSequence cs, int[][] gpa, String script, String language ) {
- load(true);
- if ( realFontDescriptor instanceof Substitutable ) {
- return ((Substitutable)realFontDescriptor)
- .reorderCombiningMarks(cs, gpa, script, language);
- } else {
- return cs;
- }
- }
-
- /**
- * {@inheritDoc}
- */
- public boolean performsPositioning() {
- load(true);
- if ( realFontDescriptor instanceof Positionable ) {
- return ((Positionable)realFontDescriptor).performsPositioning();
- } else {
- return false;
- }
- }
-
- /**
- * {@inheritDoc}
- */
- public int[][]
- performPositioning ( CharSequence cs, String script, String language, int fontSize ) {
- load(true);
- if ( realFontDescriptor instanceof Positionable ) {
- return ((Positionable)realFontDescriptor)
- .performPositioning(cs, script, language, fontSize);
- } else {
- return null;
- }
- }
-
- /**
- * {@inheritDoc}
- */
- public int[][]
- performPositioning ( CharSequence cs, String script, String language ) {
- load(true);
- if ( realFontDescriptor instanceof Positionable ) {
- return ((Positionable)realFontDescriptor)
- .performPositioning(cs, script, language);
- } else {
- return null;
- }
- }
-
- /**
- * {@inheritDoc}
- */
- public boolean isSubsetEmbedded() {
- load(true);
- return realFont.isMultiByte();
- }
-
- }
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