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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.render.ps;
-
- 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.PathIterator;
- import java.awt.geom.Point2D;
- import java.io.IOException;
- import java.text.AttributedCharacterIterator;
- import java.util.Iterator;
- import java.util.List;
-
- import org.apache.batik.gvt.font.GVTGlyphVector;
- import org.apache.batik.gvt.text.TextPaintInfo;
- import org.apache.batik.gvt.text.TextSpanLayout;
-
- import org.apache.xmlgraphics.java2d.ps.PSGraphics2D;
- import org.apache.xmlgraphics.ps.PSGenerator;
-
- import org.apache.fop.fonts.Font;
- import org.apache.fop.fonts.FontInfo;
- import org.apache.fop.fonts.FontMetrics;
- import org.apache.fop.fonts.LazyFont;
- import org.apache.fop.fonts.MultiByteFont;
- import org.apache.fop.svg.NativeTextPainter;
- import org.apache.fop.util.CharUtilities;
- import org.apache.fop.util.HexEncoder;
-
- /**
- * Renders the attributed character iterator of a text node.
- * This class draws the text directly using PostScript text operators so
- * the text is not drawn using shapes which makes the PS files larger.
- * <p>
- * The text runs are split into smaller text runs that can be bundles in single
- * calls of the xshow, yshow or xyshow operators. For outline text, the charpath
- * operator is used.
- */
- public class PSTextPainter extends NativeTextPainter {
-
- private static final boolean DEBUG = false;
-
- private FontResourceCache fontResources;
-
- private static final AffineTransform IDENTITY_TRANSFORM = new AffineTransform();
-
- /**
- * Create a new PS text painter with the given font information.
- * @param fontInfo the font collection
- */
- public PSTextPainter(FontInfo fontInfo) {
- super(fontInfo);
- this.fontResources = new FontResourceCache(fontInfo);
- }
-
- /** {@inheritDoc} */
- protected boolean isSupported(Graphics2D g2d) {
- return g2d instanceof PSGraphics2D;
- }
-
- /** {@inheritDoc} */
- protected void paintTextRun(TextRun textRun, Graphics2D g2d) throws IOException {
- 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 PSGraphics2D ps = (PSGraphics2D)g2d;
- final PSGenerator gen = ps.getPSGenerator();
- ps.preparePainting();
-
- if (DEBUG) {
- log.debug("Text: " + chars);
- gen.commentln("%Text: " + chars);
- }
-
- GeneralPath debugShapes = null;
- if (DEBUG) {
- debugShapes = new GeneralPath();
- }
-
- TextUtil textUtil = new TextUtil(gen);
- textUtil.setupFonts(runaci);
- if (!textUtil.hasFonts()) {
- //Draw using Java2D when no native fonts are available
- textRun.getLayout().draw(g2d);
- return;
- }
-
- gen.saveGraphicsState();
- gen.concatMatrix(g2d.getTransform());
- Shape imclip = g2d.getClip();
- clip(ps, imclip);
-
- gen.writeln("BT"); //beginTextObject()
-
- AffineTransform localTransform = new AffineTransform();
- Point2D prevPos = null;
- GVTGlyphVector gv = layout.getGlyphVector();
- PSTextRun psRun = new PSTextRun(); //Used to split a text run into smaller runs
- 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);
- 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 flushCurrentRun = false;
- //Try to optimize by combining characters using the same font and on the same line.
- if (glyphTransform != null) {
- //Happens for text-on-a-path
- flushCurrentRun = true;
- }
- if (psRun.getRunLength() >= 128) {
- //Don't let a run get too long
- flushCurrentRun = true;
- }
-
- //Note the position of the glyph relative to the previous one
- Point2D relPos;
- if (prevPos == null) {
- relPos = new Point2D.Double(0, 0);
- } else {
- relPos = new Point2D.Double(
- glyphPos.getX() - prevPos.getX(),
- glyphPos.getY() - prevPos.getY());
- }
- if (psRun.vertChanges == 0
- && psRun.getHorizRunLength() > 2
- && relPos.getY() != 0) {
- //new line
- flushCurrentRun = true;
- }
-
- //Select the actual character to paint
- char paintChar = (CharUtilities.isAnySpace(ch) ? ' ' : ch);
-
- //Select (sub)font for character
- Font f = textUtil.selectFontForChar(paintChar);
- char mapped = f.mapChar(ch);
- boolean fontChanging = textUtil.isFontChanging(f, mapped);
- if (fontChanging) {
- flushCurrentRun = true;
- }
-
- if (flushCurrentRun) {
- //Paint the current run and reset for the next run
- psRun.paint(ps, textUtil, tpi);
- psRun.reset();
- }
-
- //Track current run
- psRun.addCharacter(paintChar, relPos);
- psRun.noteStartingTransformation(localTransform);
-
- //Change font if necessary
- if (fontChanging) {
- textUtil.setCurrentFont(f, mapped);
- }
-
- //Update last position
- prevPos = glyphPos;
- }
- psRun.paint(ps, textUtil, tpi);
- gen.writeln("ET"); //endTextObject()
- gen.restoreGraphicsState();
-
- if (DEBUG) {
- //Paint debug shapes
- g2d.setStroke(new BasicStroke(0));
- g2d.setColor(Color.LIGHT_GRAY);
- g2d.draw(debugShapes);
- }
- }
-
- private void applyColor(Paint paint, final PSGenerator gen) throws IOException {
- if (paint == null) {
- return;
- } else if (paint instanceof Color) {
- Color col = (Color)paint;
- gen.useColor(col);
- } else {
- log.warn("Paint not supported: " + paint.toString());
- }
- }
-
- private PSFontResource getResourceForFont(Font f, String postfix) {
- String key = (postfix != null ? f.getFontName() + '_' + postfix : f.getFontName());
- return this.fontResources.getFontResourceForFontKey(key);
- }
-
- private void clip(PSGraphics2D ps, Shape shape) throws IOException {
- if (shape == null) {
- return;
- }
- ps.getPSGenerator().writeln("newpath");
- PathIterator iter = shape.getPathIterator(IDENTITY_TRANSFORM);
- ps.processPathIterator(iter);
- ps.getPSGenerator().writeln("clip");
- }
-
- private class TextUtil {
-
- private PSGenerator gen;
- private Font[] fonts;
- private Font currentFont;
- private int currentEncoding = -1;
-
- public TextUtil(PSGenerator gen) {
- this.gen = gen;
- }
-
- public Font selectFontForChar(char ch) {
- for (int i = 0, c = fonts.length; i < c; i++) {
- if (fonts[i].hasChar(ch)) {
- return fonts[i];
- }
- }
- return fonts[0]; //TODO Maybe fall back to painting with shapes
- }
-
- public void writeTextMatrix(AffineTransform transform) throws IOException {
- double[] matrix = new double[6];
- transform.getMatrix(matrix);
- gen.writeln(gen.formatDouble5(matrix[0]) + " "
- + gen.formatDouble5(matrix[1]) + " "
- + gen.formatDouble5(matrix[2]) + " "
- + gen.formatDouble5(matrix[3]) + " "
- + gen.formatDouble5(matrix[4]) + " "
- + gen.formatDouble5(matrix[5]) + " Tm");
- }
-
- public boolean isFontChanging(Font f, char mapped) {
- if (f != getCurrentFont()) {
- return true;
- }
- if (mapped / 256 != getCurrentFontEncoding()) {
- return true;
- }
- return false; //Font is the same
- }
-
- public void selectFont(Font f, char mapped) throws IOException {
- int encoding = mapped / 256;
- String postfix = (encoding == 0 ? null : Integer.toString(encoding));
- PSFontResource res = getResourceForFont(f, postfix);
- gen.useFont("/" + res.getName(), f.getFontSize() / 1000f);
- res.notifyResourceUsageOnPage(gen.getResourceTracker());
- }
-
- public Font getCurrentFont() {
- return this.currentFont;
- }
-
- public int getCurrentFontEncoding() {
- return this.currentEncoding;
- }
-
- public void setCurrentFont(Font font, int encoding) {
- this.currentFont = font;
- this.currentEncoding = encoding;
- }
-
- public void setCurrentFont(Font font, char mapped) {
- int encoding = mapped / 256;
- setCurrentFont(font, encoding);
- }
-
- public void setupFonts(AttributedCharacterIterator runaci) {
- this.fonts = findFonts(runaci);
- }
-
- public boolean hasFonts() {
- return (fonts != null) && (fonts.length > 0);
- }
-
- }
-
- private class PSTextRun {
-
- private AffineTransform textTransform;
- private List relativePositions = new java.util.LinkedList();
- private StringBuffer currentChars = new StringBuffer();
- private int horizChanges = 0;
- private int vertChanges = 0;
-
- public void reset() {
- textTransform = null;
- currentChars.setLength(0);
- horizChanges = 0;
- vertChanges = 0;
- relativePositions.clear();
- }
-
- public int getHorizRunLength() {
- if (this.vertChanges == 0
- && getRunLength() > 0) {
- return getRunLength();
- }
- return 0;
- }
-
- public void addCharacter(char paintChar, Point2D relPos) {
- addRelativePosition(relPos);
- currentChars.append(paintChar);
- }
-
- private void addRelativePosition(Point2D relPos) {
- if (getRunLength() > 0) {
- if (relPos.getX() != 0) {
- horizChanges++;
- }
- if (relPos.getY() != 0) {
- vertChanges++;
- }
- }
- relativePositions.add(relPos);
- }
-
- public void noteStartingTransformation(AffineTransform transform) {
- if (textTransform == null) {
- this.textTransform = new AffineTransform(transform);
- }
- }
-
- public int getRunLength() {
- return currentChars.length();
- }
-
- private boolean isXShow() {
- return vertChanges == 0;
- }
-
- private boolean isYShow() {
- return horizChanges == 0;
- }
-
- public void paint(PSGraphics2D g2d, TextUtil textUtil, TextPaintInfo tpi)
- throws IOException {
- if (getRunLength() > 0) {
- if (log.isDebugEnabled()) {
- log.debug("Text run: " + currentChars);
- }
- textUtil.writeTextMatrix(this.textTransform);
- if (isXShow()) {
- log.debug("Horizontal text: xshow");
- paintXYShow(g2d, textUtil, tpi.fillPaint, true, false);
- } else if (isYShow()) {
- log.debug("Vertical text: yshow");
- paintXYShow(g2d, textUtil, tpi.fillPaint, false, true);
- } else {
- log.debug("Arbitrary text: xyshow");
- paintXYShow(g2d, textUtil, tpi.fillPaint, true, true);
- }
- boolean stroke = (tpi.strokePaint != null) && (tpi.strokeStroke != null);
- if (stroke) {
- log.debug("Stroked glyph outlines");
- paintStrokedGlyphs(g2d, textUtil, tpi.strokePaint, tpi.strokeStroke);
- }
- }
- }
-
- private void paintXYShow(PSGraphics2D g2d, TextUtil textUtil, Paint paint,
- boolean x, boolean y) throws IOException {
- PSGenerator gen = textUtil.gen;
- char firstChar = this.currentChars.charAt(0);
- //Font only has to be setup up before the first character
- Font f = textUtil.selectFontForChar(firstChar);
- char mapped = f.mapChar(firstChar);
- textUtil.selectFont(f, mapped);
- textUtil.setCurrentFont(f, mapped);
- applyColor(paint, gen);
-
- FontMetrics metrics = f.getFontMetrics();
- boolean multiByte = metrics instanceof MultiByteFont
- || metrics instanceof LazyFont
- && ((LazyFont) metrics).getRealFont() instanceof MultiByteFont;
- StringBuffer sb = new StringBuffer();
- sb.append(multiByte ? '<' : '(');
- for (int i = 0, c = this.currentChars.length(); i < c; i++) {
- char ch = this.currentChars.charAt(i);
- mapped = f.mapChar(ch);
- if (multiByte) {
- sb.append(HexEncoder.encode(mapped));
- } else {
- char codepoint = (char) (mapped % 256);
- PSGenerator.escapeChar(codepoint, sb);
- }
- }
- sb.append(multiByte ? '>' : ')');
- if (x || y) {
- sb.append("\n[");
- int idx = 0;
- Iterator iter = this.relativePositions.iterator();
- while (iter.hasNext()) {
- Point2D pt = (Point2D)iter.next();
- if (idx > 0) {
- if (x) {
- sb.append(format(gen, pt.getX()));
- }
- if (y) {
- if (x) {
- sb.append(' ');
- }
- sb.append(format(gen, -pt.getY()));
- }
- if (idx % 8 == 0) {
- sb.append('\n');
- } else {
- sb.append(' ');
- }
- }
- idx++;
- }
- if (x) {
- sb.append('0');
- }
- if (y) {
- if (x) {
- sb.append(' ');
- }
- sb.append('0');
- }
- sb.append(']');
- }
- sb.append(' ');
- if (x) {
- sb.append('x');
- }
- if (y) {
- sb.append('y');
- }
- sb.append("show"); // --> xshow, yshow or xyshow
- gen.writeln(sb.toString());
- }
-
- private String format(PSGenerator gen, double coord) {
- if (Math.abs(coord) < 0.00001) {
- return "0";
- } else {
- return gen.formatDouble5(coord);
- }
- }
-
- private void paintStrokedGlyphs(PSGraphics2D g2d, TextUtil textUtil,
- Paint strokePaint, Stroke stroke) throws IOException {
- PSGenerator gen = textUtil.gen;
-
- applyColor(strokePaint, gen);
- PSGraphics2D.applyStroke(stroke, gen);
-
- Font f = null;
- Iterator iter = this.relativePositions.iterator();
- iter.next();
- Point2D pos = new Point2D.Double(0, 0);
- gen.writeln("0 0 M");
- for (int i = 0, c = this.currentChars.length(); i < c; i++) {
- char ch = this.currentChars.charAt(0);
- if (i == 0) {
- //Font only has to be setup up before the first character
- f = textUtil.selectFontForChar(ch);
- }
- char mapped = f.mapChar(ch);
- if (i == 0) {
- textUtil.selectFont(f, mapped);
- textUtil.setCurrentFont(f, mapped);
- }
- //add glyph outlines to current path
- mapped = f.mapChar(this.currentChars.charAt(i));
- FontMetrics metrics = f.getFontMetrics();
- boolean multiByte = metrics instanceof MultiByteFont
- || metrics instanceof LazyFont
- && ((LazyFont) metrics).getRealFont() instanceof MultiByteFont;
- if (multiByte) {
- gen.write('<');
- gen.write(HexEncoder.encode(mapped));
- gen.write('>');
- } else {
- char codepoint = (char)(mapped % 256);
- gen.write("(" + codepoint + ")");
- }
- gen.writeln(" false charpath");
-
- if (iter.hasNext()) {
- //Position for the next character
- Point2D pt = (Point2D)iter.next();
- pos.setLocation(pos.getX() + pt.getX(), pos.getY() - pt.getY());
- gen.writeln(gen.formatDouble5(pos.getX()) + " "
- + gen.formatDouble5(pos.getY()) + " M");
- }
- }
- gen.writeln("stroke"); //paints all accumulated glyph outlines
- }
-
- }
-
- }
-
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