org.jpedal.parser.text.BDC Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
Open Source (LGPL) JavaFX PDF Viewer for NetBeans plugin
The newest version!
/*
 * ===========================================
 * 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@
 *
 * ---------------
 * BDC.java
 * ---------------
 */
package org.jpedal.parser.text;

import java.awt.geom.Area;
import java.awt.geom.Rectangle2D;

import org.jpedal.io.ObjectDecoder;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.MCObject;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.parser.ParserOptions;
import org.jpedal.render.DynamicVectorRenderer;

public class BDC {

    public static PdfObject execute(int startCommand, final int dataPointer, final byte[] raw, final String op,
                                    final GraphicsState gs, final PdfObjectReader currentPdfFile, final DynamicVectorRenderer current, final ParserOptions parserOptions) {

        final PdfObject BDCobj = new MCObject(op);
        BDCobj.setID(PdfDictionary.BDC); //use an existing feature to add unknown tags

        final int rawStart = startCommand;

        if (startCommand < 1) {
            startCommand = 1;
        }

        boolean hasDictionary = true;
        while (startCommand < raw.length && raw[startCommand] != '<' && raw[startCommand - 1] != '<') {
            startCommand++;

            if (raw[startCommand] == 'B' && raw[startCommand + 1] == 'D' && raw[startCommand + 2] == 'C') {
                hasDictionary = false;
                break;
            }
        }

        if (hasDictionary) { // &&(parserOptions.getPdfLayerList()!=null && parserOptions.isLayerVisible())){
            //System.out.println(new String(raw));
            final ObjectDecoder objectDecoder = new ObjectDecoder(currentPdfFile.getObjectReader());
            objectDecoder.setEndPt(dataPointer);
            objectDecoder.readDictionaryAsObject(BDCobj, startCommand + 1, raw);
        }

        handleCommand(BDCobj, gs, current, dataPointer, raw, hasDictionary, rawStart, parserOptions);

        return BDCobj;

    }


    private static void handleCommand(final PdfObject BDCobj, final GraphicsState gs, final DynamicVectorRenderer current, final int dataPointer, final byte[] raw, final boolean hasDictionary, final int rawStart, final ParserOptions parserOptions) {

        parserOptions.setLayerLevel(parserOptions.getLayerLevel() + 1);

        //add in layer if visible
        if (parserOptions.layers != null && parserOptions.isLayerVisible()) {

            String name = "";

            if (hasDictionary) {
                //see if name and if shown
                name = BDCobj.getName(PdfDictionary.OC);

                //see if Layer defined and get title if no Name as alternative
                if (name == null) {

                    final PdfObject layerObj = BDCobj.getDictionary(PdfDictionary.Layer);
                    if (layerObj != null) {
                        name = layerObj.getTextStreamValue(PdfDictionary.Title);
                    }
                }

                //needed to flags its a BMC
                parserOptions.layerClips.add(parserOptions.getLayerLevel());

                //apply any clip, saving old to restore on EMC
                final float[] BBox = BDCobj.getFloatArray(PdfDictionary.BBox);
                if (BBox != null) {
                    // Area currentClip=gs.getClippingShape();

                    //store so we restore in EMC
                    //if(currentClip!=null)
                    //  parserOptions.layerClips.put(parserOptions.layerLevel,currentClip.clone());

                    final Area clip = new Area(new Rectangle2D.Float(BBox[0], BBox[1], -gs.CTM[2][0] + (BBox[2] - BBox[0]), -gs.CTM[2][1] + (BBox[3] - BBox[1])));

                    if (clip.getBounds().getWidth() > 0 && clip.getBounds().getHeight() > 0) {
                        gs.setClippingShape(clip);

                        current.drawClip(gs, clip, true);

                        BDCobj.setClip(clip);
                    }

                }
            } else { //direct just /OC and /MCxx

                //find /OC
                name = readOPName(dataPointer, raw, rawStart, name);
            }

            if (name != null && !name.isEmpty()) //name referring to Layer or Title
            {
                parserOptions.setIsLayerVisible(parserOptions.layers.decodeLayer(name, true));
            }

            //flag so we can next values
            if (parserOptions.isLayerVisible()) {
                parserOptions.getLayerVisibility().add(parserOptions.getLayerLevel());
            }

        }
    }

    private static String readOPName(final int dataPointer, final byte[] raw, final int rawStart, String name) {
        for (int ii = rawStart; ii < dataPointer; ii++) {
            if (raw[ii] == '/' && raw[ii + 1] == 'O' && raw[ii + 2] == 'C') { //find oc

                ii += 2;
                //roll onto value
                while (raw[ii] != '/') {
                    ii++;
                }

                ii++; //roll pass /

                final int strStart = ii;
                int charCount = 0;

                while (ii < dataPointer) {
                    ii++;
                    charCount++;

                    if (raw[ii] == 13 || raw[ii] == 10 || raw[ii] == 32 || raw[ii] == '/') {
                        break;
                    }
                }

                name = new String(raw, strStart, charCount);

            }
        }
        return name;
    }

}