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/*
* LayoutProcessor.java
*
* Copyright 2020 by Volker Kunert.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* https://github.com/LibrePDF/OpenPDF
*/
package com.lowagie.text.pdf;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.text.AttributedString;
import java.text.Bidi;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import com.lowagie.text.FontFactory;
import com.lowagie.text.error_messages.MessageLocalization;
/**
* Provides glyph layout e.g. for accented Latin letters.
*
*/
public class LayoutProcessor {
private static final int DEFAULT_FLAGS = -1;
private static final Map awtFontMap = new ConcurrentHashMap();
// Static variables can only be set once
private static boolean enabled = false;
private static int flags = DEFAULT_FLAGS;
private LayoutProcessor() {
throw new UnsupportedOperationException("static class");
}
/**
* Enables the processor
*/
public static void enable() {
enabled = true;
}
/**
* Enables the processor providing flags
* This method can only be called once.
*
* @param flags see java.awt.Font.layoutGlyphVector
*/
public static void enable(int flags) {
if (enabled) {
throw new UnsupportedOperationException("LayoutProcessor is already enabled");
}
enabled = true;
LayoutProcessor.flags = flags;
}
public static boolean isEnabled() {
return enabled;
}
public static boolean supportsFont(BaseFont baseFont) {
boolean supports = enabled && (awtFontMap.get(baseFont) != null);
return supports;
}
/**
* Loads the AWT font needed for layout
*
* @param baseFont OpenPdf base font
* @param filename of the font file
*
* @throws RuntimeException if font can not be loaded
*/
public static void loadFont(BaseFont baseFont, String filename) {
if (!enabled) {
return;
}
java.awt.Font awtFont = null;
InputStream inputStream = null;
try {
awtFont = awtFontMap.get(baseFont);
if (awtFont == null) {
// getting the inputStream is adapted from com.lowagie.text.pdf.RandomAccessFileOrArray
File file = new File(filename);
if (!file.exists() && FontFactory.isRegistered(filename)) {
filename = (String) FontFactory.getFontImp().getFontPath(filename);
file = new File(filename);
}
if (file.canRead()) {
inputStream = new FileInputStream(file);
} else if (filename.startsWith("file:/") || filename.startsWith("http://")
|| filename.startsWith("https://") || filename.startsWith("jar:")
|| filename.startsWith("wsjar:")) {
inputStream = new URL(filename).openStream();
} else if ("-".equals(filename)) {
inputStream = System.in;
} else {
inputStream = BaseFont.getResourceStream(filename);
}
if (inputStream == null) {
throw new IOException(
MessageLocalization.getComposedMessage("1.not.found.as.file.or.resource", filename));
}
awtFont = java.awt.Font.createFont(java.awt.Font.TRUETYPE_FONT, inputStream);
if (awtFont != null) {
awtFontMap.put(baseFont, awtFont);
}
}
} catch (Exception e) {
throw new RuntimeException(String.format("Font creation failed for %s.", filename), e);
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e) {
// ignore
}
}
}
}
/**
* Computes glyph positioning
*
* @param baseFont OpenPdf base font
* @param text input text
* @return glyph vector containing reordered text, width and positioning info
*/
public static GlyphVector computeGlyphVector(BaseFont baseFont, float fontSize, String text) {
char[] chars = text.toCharArray();
FontRenderContext fontRenderContext = new FontRenderContext(new AffineTransform(), false, true);
// specify fractional metrics to compute accurate positions
int localFlags = LayoutProcessor.flags;
if (localFlags == DEFAULT_FLAGS) {
AttributedString as = new AttributedString(text);
Bidi bidi = new Bidi(as.getIterator());
localFlags = bidi.isLeftToRight() ? java.awt.Font.LAYOUT_LEFT_TO_RIGHT : java.awt.Font.LAYOUT_RIGHT_TO_LEFT;
}
java.awt.Font awtFont = LayoutProcessor.awtFontMap.get(baseFont).deriveFont(fontSize);
GlyphVector glyphVector = awtFont.layoutGlyphVector(fontRenderContext, chars, 0, chars.length, localFlags);
return glyphVector;
}
/**
* Checks if the glyphVector contains adjustments
* that make advanced layout necessary
*
* @param glyphVector glyph vector containing the positions
* @return true, if the glyphVector contains adjustments
*/
private static boolean hasAdjustments(GlyphVector glyphVector) {
boolean retVal = false;
float lastX = 0f;
float lastY = 0f;
for (int i = 0; i < glyphVector.getNumGlyphs(); i++) {
Point2D p = glyphVector.getGlyphPosition(i);
float dx = (float) p.getX() - lastX;
float dy = (float) p.getY() - lastY;
float ax = (i == 0) ? 0.0f : glyphVector.getGlyphMetrics(i - 1).getAdvanceX();
float ay = (i == 0) ? 0.0f : glyphVector.getGlyphMetrics(i - 1).getAdvanceY();
if (dx != ax || dy != ay) {
retVal = true;
break;
}
lastX = (float) p.getX();
lastY = (float) p.getY();
}
return retVal;
}
/**
* Shows a text using glyph positioning (if needed)
*
* @param cb object containing the content of the page
* @param baseFont base font to use
* @param fontSize font size to apply
* @param text text to show
* @return layout position correction to correct the start of the next line
*/
public static Point2D showText(PdfContentByte cb, BaseFont baseFont, float fontSize, String text) {
GlyphVector glyphVector = computeGlyphVector(baseFont, fontSize, text);
if (!hasAdjustments(glyphVector)) {
cb.showText(glyphVector);
Point2D p = glyphVector.getGlyphPosition(glyphVector.getNumGlyphs());
float dx = (float) p.getX();
float dy = (float) p.getY();
cb.moveTextBasic(dx, -dy);
return new Point2D.Double(-dx, dy);
}
float lastX = 0f;
float lastY = 0f;
for (int i = 0; i < glyphVector.getNumGlyphs(); i++) {
Point2D p = glyphVector.getGlyphPosition(i);
float dx = (float) p.getX() - lastX;
float dy = (float) p.getY() - lastY;
cb.moveTextBasic(dx, -dy);
cb.showText(glyphVector, i, i + 1);
lastX = (float) p.getX();
lastY = (float) p.getY();
}
Point2D p = glyphVector.getGlyphPosition(glyphVector.getNumGlyphs());
float dx = (float) p.getX() - lastX;
float dy = (float) p.getY() - lastY;
cb.moveTextBasic(dx, -dy);
return new Point2D.Double(-p.getX(), p.getY());
}
}
