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Open Source (LGPL) JavaFX PDF Viewer for NetBeans plugin
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/*
 * ===========================================
 * 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
 *
 @LICENSE@
 *
 * ---------------
 * 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 gs
     * @param pdfStreamDecoder
     * @param fontID
     * @param pdfFontFactory
     * @param cache
     * @return
     */
    public static PdfFont resolveFont(final GraphicsState gs, final PdfStreamDecoder pdfStreamDecoder, String fontID, final PdfFontFactory pdfFontFactory, final PdfObjectCache cache) {

        PdfFont restoredFont;

        //local copies
        final PdfObjectReader currentPdfFile = pdfStreamDecoder.currentPdfFile;
        final ParserOptions parserOptions = pdfStreamDecoder.parserOptions;

        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(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 (parserOptions.isFlattenedForm() && newFont == null) {

                newFont = new FontObject("0 0 R");

                fontID = resolveFlattenedFont(fontID, newFont);
            }

            if (newFont != null) {

                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,
                            parserOptions.isRenderPage(), pdfStreamDecoder.errorTracker, isHTML);

                    if (isHTML) {
                        HTMLFontHandler.processFont(restoredFont, current, newFont, 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()) {
                cache.resolvedFonts.put(fontKey, restoredFont);

                if (restoredFont.getFontType() == StandardFonts.TYPE3) {
                    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;
    }
}