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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* FontResolver.java
* ---------------
*/
package org.jpedal.parser;
import org.jpedal.exception.PdfException;
import org.jpedal.fonts.FontMappings;
import org.jpedal.fonts.PdfFont;
import org.jpedal.fonts.StandardFonts;
import org.jpedal.io.ObjectDecoder;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.FontObject;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.render.DynamicVectorRenderer;
import org.jpedal.render.output.HTMLFontHandler;
import org.jpedal.utils.LogWriter;
public class FontResolver {
/**
* decode or get font
* @param pdfStreamDecoder
* @param fontID
* @param pdfFontFactory
*/
public static PdfFont resolveFont(final GraphicsState gs, final PdfStreamDecoder pdfStreamDecoder, String fontID, final PdfFontFactory pdfFontFactory, final PdfObjectCache cache) {
PdfFont restoredFont;
String fontKey=fontID;
if(gs!=null && cache.resolvedFonts.get("t-"+fontID)!=null){ //see if cached type3 font and use colour if so
fontKey = fontID + ':' + gs.nonstrokeColorSpace.getColor().getRGB();
}
restoredFont=cache.resolvedFonts.get(fontKey);
//check it was decoded
if(restoredFont==null){
PdfObject newFont=null;
final byte[] newFontData= cache.unresolvedFonts.get(fontID);
if(newFontData==null){ //once decoded remove from this list of stub font objects
cache.directFonts.remove(fontID);
}else{
newFont=getFontObjectFromRefOrDirect(pdfStreamDecoder.currentPdfFile, newFontData);
}
/*
* in Flatten forms, if font not in our resources, we need to create one based on name
* Otherwise we will not switch from whatever is last being used on page (and might have custom value)
*/
if(pdfStreamDecoder.parserOptions.isFlattenedForm() && newFont==null){
newFont=new FontObject("0 0 R");
fontID = resolveFlattenedFont(fontID, newFont);
}
if(newFont!=null){
pdfStreamDecoder.currentPdfFile.checkResolved(newFont);
try {
final org.jpedal.render.DynamicVectorRenderer current= pdfStreamDecoder.current;
boolean fallbackToArial=false;
final boolean isHTML=current.isHTMLorSVG();
/* if text as shape or image, display Arial if font not embedded*/
if(isHTML && !current.getBooleanValue(DynamicVectorRenderer.IsRealText)){
fallbackToArial=true;
}
restoredFont = pdfFontFactory.createFont(fallbackToArial, newFont, fontID, pdfStreamDecoder.objectStoreStreamRef,
pdfStreamDecoder.parserOptions.isRenderPage(),
pdfStreamDecoder.errorTracker, pdfStreamDecoder.isPrinting, isHTML);
if (isHTML) {
HTMLFontHandler.processFont(restoredFont, current, newFont, pdfStreamDecoder.currentPdfFile);
}
} catch (final PdfException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
//store (we cache Type3 with colour as colour can change)
if(restoredFont!=null && !pdfStreamDecoder.parserOptions.isFlattenedForm()) {
pdfStreamDecoder.cache.resolvedFonts.put(fontKey, restoredFont);
if(restoredFont.getFontType()==StandardFonts.TYPE3){
pdfStreamDecoder.cache.resolvedFonts.put("t-"+fontID, new PdfFont());
}
}
}
return restoredFont;
}
private static String resolveFlattenedFont(String fontID, final PdfObject newFont) {
String name= StandardFonts.expandName(fontID.replace(",", "-"));
//if font not present then use a replacement
if(FontMappings.fontSubstitutionAliasTable.get(name)==null && FontMappings.fontSubstitutionTable!=null && FontMappings.fontSubstitutionTable.get(name)==null){
final String rawName=name.toLowerCase();
if(rawName.contains("bold")) {
name = "Arial-Bold";
} else if(rawName.contains("italic")) {
name = "Arial-Italic";
} else {
name = "Arial";
}
}
newFont.setConstant(PdfDictionary.Subtype, StandardFonts.TRUETYPE);
fontID=StandardFonts.expandName(name); //turns common shortened versions used in AP (ie Helv to Helvetica)
return fontID;
}
private static FontObject getFontObjectFromRefOrDirect(final PdfObjectReader currentPdfFile, final byte[] data) {
final FontObject obj = new FontObject(new String(data));
if(data[0]=='<') {
obj.setStatus(PdfObject.UNDECODED_DIRECT);
} else {
obj.setStatus(PdfObject.UNDECODED_REF);
}
obj.setUnresolvedData(data,PdfDictionary.Font);
final ObjectDecoder objectDecoder=new ObjectDecoder(currentPdfFile.getObjectReader());
objectDecoder.checkResolved(obj);
return obj;
}
}