org.jpedal.parser.image.PDFObjectToImage Maven / Gradle / Ivy

/*
 * ===========================================
 * 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@
 *
 * ---------------
 * PDFObjectToImage.java
 * ---------------
 */
package org.jpedal.parser.image;

import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;

import org.jpedal.color.ColorSpaces;
import org.jpedal.color.ColorspaceFactory;
import org.jpedal.color.GenericColorSpace;
import org.jpedal.exception.PdfException;
import org.jpedal.io.ObjectStore;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.raw.PdfArrayIterator;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.parser.ParserOptions;
import org.jpedal.parser.PdfStreamDecoder;
import org.jpedal.parser.ValueTypes;
import org.jpedal.render.DynamicVectorRenderer;
import org.jpedal.render.ImageDisplay;
import org.jpedal.utils.LogWriter;

/**
 *
 */
public class PDFObjectToImage {


    public static BufferedImage getImageFromPdfObject(final PdfObject newSMask, int fx, final int fw, int fy, final int fh,
                                                      final PdfObjectReader currentPdfFile, final ParserOptions parserOptions, final int formLevel, final float multiplyer, final boolean useTransparency, final float scaling) {

        BufferedImage smaskImage;
        final Graphics2D formG2;
        final byte[] objectData = currentPdfFile.readStream(newSMask, true, true, false, false, false, newSMask.getCacheName(currentPdfFile.getObjectReader()));

        final ObjectStore localStore = new ObjectStore();

        final DynamicVectorRenderer glyphDisplay = new ImageDisplay(0, false, 20, localStore);

        final PdfStreamDecoder glyphDecoder = new PdfStreamDecoder(currentPdfFile);

        glyphDecoder.setParameters(parserOptions.isPageContent(), parserOptions.isRenderPage(), parserOptions.getRenderMode(), parserOptions.getExtractionMode(), false, false);
        glyphDecoder.setObjectValue(ValueTypes.ObjectStore, localStore);
        glyphDecoder.setRenderer(glyphDisplay);
        glyphDecoder.setMultiplyer(multiplyer);
        glyphDecoder.setFormLevel(formLevel);

        //we need to explicitly set scaling to 1
        //glyphDisplay.setScalingValues(0,0,1);
        
        /*read any resources*/
        try {

            final PdfObject SMaskResources = newSMask.getDictionary(PdfDictionary.Resources);
            if (SMaskResources != null) {
                glyphDecoder.readResources(SMaskResources, false);
            }

        } catch (final PdfException e) {
            LogWriter.writeLog("Exception: " + e.getMessage());
        }

        int w = fw - fx;
        if (w < 0) {
            w = -w;
            fx -= w;
        }
        if (w == 0) {
            w = 1;
        }

        int h = fh - fy;
        if (h < 0) {
            h = -h;
            fy -= h;
        }

        if (h == 0) {
            h = 1;
        }
        try {

            smaskImage = new BufferedImage((int) (w * scaling), (int) (h * scaling), BufferedImage.TYPE_INT_ARGB);

            formG2 = smaskImage.createGraphics();

            formG2.scale(scaling, scaling);
            formG2.translate(-fx, -fy);

            glyphDisplay.setG2(formG2);

            if (useTransparency) { //try to mimic any group transparency

                final PdfObject group = newSMask.getDictionary(PdfDictionary.Group);
                if (group != null) {
                    currentPdfFile.checkResolved(group);
                    final String Tname = group.getName(PdfDictionary.S);

                    final PdfArrayIterator ColorSpace = group.getMixedArray(PdfDictionary.ColorSpace);

                    if (ColorSpace != null && ColorSpace.getTokenCount() > 0) {

                        final GenericColorSpace newColorSpace = ColorspaceFactory.getColorSpaceInstance(currentPdfFile, ColorSpace);

                        //System.out.println(group.getDictionary(PdfDictionary.ColorSpace) +" "+group.getObjectRefAsString()+" "+group.getBoolean(PdfDictionary.I)+" "+group.getBoolean(PdfDictionary.K)+" ");
                        if (group.getBoolean(PdfDictionary.I) == false && group.getBoolean(PdfDictionary.K) == false && newColorSpace != null && newColorSpace.getID() == ColorSpaces.DeviceCMYK) {
                            //  System.out.println("Ignore");
                        } else if (Tname.equals("Transparency")) {

                            formG2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));
                        }
                    }
                }
            }

        } catch (final Error err) {
            LogWriter.writeLog("Exception: " + err.getMessage());

            smaskImage = null;
        }
        
        /*decode the stream*/
        if (objectData != null) {
            glyphDecoder.decodeStreamIntoObjects(objectData, false);
        }

        glyphDecoder.dispose();

        localStore.flush();

        return smaskImage;
    }
}