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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.svg;
import java.awt.Graphics2D;
import java.io.IOException;
import java.text.AttributedCharacterIterator;
import java.util.List;
import org.apache.batik.gvt.renderer.StrokingTextPainter;
import org.apache.batik.gvt.text.TextSpanLayout;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.fonts.Font;
import org.apache.fop.fonts.FontInfo;
import org.apache.fop.util.CharUtilities;
/**
* Abstract base class for text painters that use specialized text commands native to an output
* format to render text.
*/
public abstract class NativeTextPainter extends StrokingTextPainter {
/** the logger for this class */
protected Log log = LogFactory.getLog(NativeTextPainter.class);
/** the font collection */
protected final FontInfo fontInfo;
/**
* Creates a new instance.
* @param fontInfo the font collection
*/
public NativeTextPainter(FontInfo fontInfo) {
this.fontInfo = fontInfo;
}
/**
* Indicates whether the given {@link Graphics2D} instance if compatible with this text painter
* implementation.
* @param g2d the instance to check
* @return true if the instance is compatible.
*/
protected abstract boolean isSupported(Graphics2D g2d);
/**
* Paints a single text run.
* @param textRun the text run
* @param g2d the target Graphics2D instance
* @throws IOException if an I/O error occurs while rendering the text
*/
protected abstract void paintTextRun(TextRun textRun, Graphics2D g2d) throws IOException;
/** {@inheritDoc} */
@Override
protected void paintTextRuns(List textRuns, Graphics2D g2d) {
if (log.isTraceEnabled()) {
log.trace("paintTextRuns: count = " + textRuns.size());
}
if (!isSupported(g2d)) {
super.paintTextRuns(textRuns, g2d);
return;
}
for (int i = 0; i < textRuns.size(); i++) {
TextRun textRun = (TextRun)textRuns.get(i);
try {
paintTextRun(textRun, g2d);
} catch (IOException ioe) {
//No other possibility than to use a RuntimeException
throw new RuntimeException(ioe);
}
}
}
/**
* Finds an array of suitable fonts for a given AttributedCharacterIterator.
* @param aci the character iterator
* @return the array of fonts
*/
protected Font[] findFonts(AttributedCharacterIterator aci) {
Font[] fonts = ACIUtils.findFontsForBatikACI(aci, fontInfo);
return fonts;
}
/**
* Collects all characters from an {@link AttributedCharacterIterator}.
* @param runaci the character iterator
* @return the characters
*/
protected CharSequence collectCharacters(AttributedCharacterIterator runaci) {
StringBuffer chars = new StringBuffer();
for (runaci.first(); runaci.getIndex() < runaci.getEndIndex();) {
chars.append(runaci.current());
runaci.next();
}
return chars;
}
/**
* @param runaci an attributed character iterator
* @param layout a text span layout
*/
protected final void logTextRun(AttributedCharacterIterator runaci, TextSpanLayout layout) {
if (log.isTraceEnabled()) {
int charCount = runaci.getEndIndex() - runaci.getBeginIndex();
log.trace("================================================");
log.trace("New text run:");
log.trace("char count: " + charCount);
log.trace("range: "
+ runaci.getBeginIndex() + " - " + runaci.getEndIndex());
log.trace("glyph count: " + layout.getGlyphCount()); //=getNumGlyphs()
}
}
/**
* @param ch a character
* @param layout a text span layout
* @param index an index
* @param visibleChar visible character flag
*/
protected final void logCharacter(char ch, TextSpanLayout layout, int index,
boolean visibleChar) {
if (log.isTraceEnabled()) {
log.trace("glyph " + index
+ " -> " + layout.getGlyphIndex(index) + " => " + ch);
if (CharUtilities.isAnySpace(ch) && ch != 32) {
log.trace("Space found: " + Integer.toHexString(ch));
} else if (ch == CharUtilities.ZERO_WIDTH_JOINER) {
log.trace("ZWJ found: " + Integer.toHexString(ch));
} else if (ch == CharUtilities.SOFT_HYPHEN) {
log.trace("Soft hyphen found: " + Integer.toHexString(ch));
}
if (!visibleChar) {
log.trace("Invisible glyph found: " + Integer.toHexString(ch));
}
}
}
}
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