org.jpedal.examples.handlers.ExampleImageDrawOnScreenHandler 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
 *
     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


 *
 * ---------------
 * ExampleImageDrawOnScreenHandler.java
 * ---------------
 */
package org.jpedal.examples.handlers;

import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;

import org.jpedal.color.ColorSpaces;
import org.jpedal.io.ObjectStore;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.utils.LogWriter;

/**
 * example code to plugin external image handler. Code to enable commented out in Viewer
 */
public class ExampleImageDrawOnScreenHandler implements org.jpedal.external.ImageHandler {

    //tell JPedal if it ignores its own Image code or not
    @Override
    public boolean alwaysIgnoreGenericHandler() {
        return false;
    } // Pass in raw data for image handling - if valid image returned it will be used.
    //if alwaysIgnoreGenericHandler() is true JPedal code always ignored. If false, JPedal code used if null

    @Override
    public BufferedImage processImageData(final GraphicsState gs, final PdfObject XObject) {
        return null;
    }

    @Override
    public boolean imageHasBeenScaled() {
        return false;
    }

    @Override
    public boolean drawImageOnscreen(BufferedImage image, final int optionsApplied, AffineTransform upside_down,
                                     final String currentImageFile, final Graphics2D g2, final boolean renderDirect,
                                     final ObjectStore objectStoreRef, final boolean isPrinting) {

        //this is the draw code from DynamicVectorRenderer as at 11th June 2007

        final double[] values = new double[6];
        upside_down.getMatrix(values);

        final boolean isSlightlyRotated = (values[0] * values[1] != 0) || (values[2] * values[3] != 0);

        //accelerate large bw images non-rotated
        //accelerate large bw images non-rotated (use for all images for moment)
        if (isSlightlyRotated || image.getWidth() < 800 || renderDirect) { //image.getType()!=12 || CTM[0][0]<0 || CTM[1][1]<0 || CTM[1][0]<0 || CTM[0][1]<0)
            g2.drawImage(image, upside_down, null);
        } else { //speedup large straightforward images

            double dy = 0, dx = 0;

            //if already turned, tweak transform

            //int count=values.length;
            //for(int jj=0;jj-->