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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.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.text.AttributedCharacterIterator;
import org.apache.batik.gvt.font.GVTGlyphVector;
import org.apache.batik.gvt.text.TextPaintInfo;
import org.apache.batik.gvt.text.TextSpanLayout;
import org.apache.fop.fonts.Font;
import org.apache.fop.fonts.FontInfo;
import org.apache.fop.util.CharUtilities;
/**
* Renders the attributed character iterator of a {@link org.apache.batik.gvt.TextNode}.
* This class draws the text directly into the PDFGraphics2D so that
* the text is not drawn using shapes which makes the PDF files larger.
* If the text is simple enough to draw then it sets the font and calls
* drawString. If the text is complex or the cannot be translated
* into a simple drawString the StrokingTextPainter is used instead.
*
* @version $Id$
*/
class PDFTextPainter extends NativeTextPainter {
private static final boolean DEBUG = false;
/**
* Create a new PDF text painter with the given font information.
* @param fi the font info
*/
public PDFTextPainter(FontInfo fi) {
super(fi);
}
/** {@inheritDoc} */
@Override
protected boolean isSupported(Graphics2D g2d) {
return g2d instanceof PDFGraphics2D;
}
/** {@inheritDoc} */
@Override
protected void paintTextRun(TextRun textRun, Graphics2D g2d) {
AttributedCharacterIterator runaci = textRun.getACI();
runaci.first();
TextPaintInfo tpi = (TextPaintInfo)runaci.getAttribute(PAINT_INFO);
if (tpi == null || !tpi.visible) {
return;
}
if ((tpi != null) && (tpi.composite != null)) {
g2d.setComposite(tpi.composite);
}
//------------------------------------
TextSpanLayout layout = textRun.getLayout();
logTextRun(runaci, layout);
CharSequence chars = collectCharacters(runaci);
runaci.first(); //Reset ACI
final PDFGraphics2D pdf = (PDFGraphics2D)g2d;
PDFTextUtil textUtil = new PDFTextUtil(pdf.fontInfo) {
protected void write(String code) {
pdf.currentStream.write(code);
}
protected void write(StringBuffer code) {
pdf.currentStream.append(code);
}
};
if (DEBUG) {
log.debug("Text: " + chars);
pdf.currentStream.write("%Text: " + chars + "\n");
}
GeneralPath debugShapes = null;
if (DEBUG) {
debugShapes = new GeneralPath();
}
Font[] fonts = findFonts(runaci);
if (fonts == null || fonts.length == 0) {
//Draw using Java2D when no native fonts are available
textRun.getLayout().draw(g2d);
return;
}
pdf.saveGraphicsState();
textUtil.concatMatrix(g2d.getTransform());
Shape imclip = g2d.getClip();
pdf.writeClip(imclip);
applyColorAndPaint(tpi, pdf);
textUtil.beginTextObject();
textUtil.setFonts(fonts);
boolean stroke = (tpi.strokePaint != null)
&& (tpi.strokeStroke != null);
textUtil.setTextRenderingMode(tpi.fillPaint != null, stroke, false);
AffineTransform localTransform = new AffineTransform();
Point2D prevPos = null;
double prevVisibleCharWidth = 0.0;
GVTGlyphVector gv = layout.getGlyphVector();
for (int index = 0, c = gv.getNumGlyphs(); index < c; index++) {
char ch = chars.charAt(index);
boolean visibleChar = gv.isGlyphVisible(index)
|| (CharUtilities.isAnySpace(ch) && !CharUtilities.isZeroWidthSpace(ch));
logCharacter(ch, layout, index, visibleChar);
if (!visibleChar) {
continue;
}
Point2D glyphPos = gv.getGlyphPosition(index);
AffineTransform glyphTransform = gv.getGlyphTransform(index);
//TODO Glyph transforms could be refined so not every char has to be painted
//with its own TJ command (stretch/squeeze case could be optimized)
if (log.isTraceEnabled()) {
log.trace("pos " + glyphPos + ", transform " + glyphTransform);
}
if (DEBUG) {
Shape sh = gv.getGlyphLogicalBounds(index);
if (sh == null) {
sh = new Ellipse2D.Double(glyphPos.getX(), glyphPos.getY(), 2, 2);
}
debugShapes.append(sh, false);
}
//Exact position of the glyph
localTransform.setToIdentity();
localTransform.translate(glyphPos.getX(), glyphPos.getY());
if (glyphTransform != null) {
localTransform.concatenate(glyphTransform);
}
localTransform.scale(1, -1);
boolean yPosChanged = (prevPos == null
|| prevPos.getY() != glyphPos.getY()
|| glyphTransform != null);
if (yPosChanged) {
if (index > 0) {
textUtil.writeTJ();
textUtil.writeTextMatrix(localTransform);
}
} else {
double xdiff = glyphPos.getX() - prevPos.getX();
//Width of previous character
Font font = textUtil.getCurrentFont();
double cw = prevVisibleCharWidth;
double effxdiff = (1000 * xdiff) - cw;
if (effxdiff != 0) {
double adjust = (-effxdiff / font.getFontSize());
textUtil.adjustGlyphTJ(adjust * 1000);
}
if (log.isTraceEnabled()) {
log.trace("==> x diff: " + xdiff + ", " + effxdiff
+ ", charWidth: " + cw);
}
}
Font f = textUtil.selectFontForChar(ch);
char paintChar = (CharUtilities.isAnySpace(ch) ? ' ' : ch);
char mappedChar = f.mapChar(paintChar);
boolean encodingChanging = false; // used for single byte
if (!textUtil.isMultiByteFont(f.getFontName())) {
int encoding = mappedChar / 256;
mappedChar = (char) (mappedChar % 256);
if (textUtil.getCurrentEncoding() != encoding) {
textUtil.setCurrentEncoding(encoding);
encodingChanging = true;
}
}
if (f != textUtil.getCurrentFont() || encodingChanging) {
textUtil.writeTJ();
textUtil.setCurrentFont(f);
textUtil.writeTf(f);
textUtil.writeTextMatrix(localTransform);
}
textUtil.writeTJMappedChar(mappedChar);
//Update last position
prevPos = glyphPos;
prevVisibleCharWidth = textUtil.getCurrentFont().getCharWidth(chars.charAt(index));
}
textUtil.writeTJ();
textUtil.endTextObject();
pdf.restoreGraphicsState();
if (DEBUG) {
g2d.setStroke(new BasicStroke(0));
g2d.setColor(Color.LIGHT_GRAY);
g2d.draw(debugShapes);
}
}
private void applyColorAndPaint(TextPaintInfo tpi, PDFGraphics2D pdf) {
Paint fillPaint = tpi.fillPaint;
Paint strokePaint = tpi.strokePaint;
Stroke stroke = tpi.strokeStroke;
int fillAlpha = PDFGraphics2D.OPAQUE;
if (fillPaint instanceof Color) {
Color col = (Color)fillPaint;
pdf.applyColor(col, true);
fillAlpha = col.getAlpha();
}
if (strokePaint instanceof Color) {
Color col = (Color)strokePaint;
pdf.applyColor(col, false);
}
pdf.applyPaint(fillPaint, true);
pdf.applyStroke(stroke);
if (strokePaint != null) {
pdf.applyPaint(strokePaint, false);
}
pdf.applyAlpha(fillAlpha, PDFGraphics2D.OPAQUE);
}
}
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