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An Open Source JavaFX PDF Viewer
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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 1997-2015 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


 *
 * ---------------
 * ImageUtils.java
 * ---------------
 */
package org.jpedal.parser.image;

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

/**
 * general image functions used in several classes
 */
public class ImageUtils {
    
    public static BufferedImage rotateImage(final BufferedImage savedImage, final int angle) {

        final BufferedImage rotatedImage;

        if(angle==180){

            final AffineTransform tx = AffineTransform.getScaleInstance(-1, -1);
            tx.translate(-savedImage.getWidth(null), -savedImage.getHeight(null));
            final AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
            rotatedImage = op.filter(savedImage, null);

        }else{

            final int w = savedImage.getWidth();
            final int h = savedImage.getHeight();
            rotatedImage = new BufferedImage(h,w,savedImage.getType());
            final Graphics2D g2 = rotatedImage.createGraphics();

            g2.rotate(Math.toRadians(angle), w/2, h/2);

            final int diff=(w-h)/2;

            if(angle==90){
                g2.drawImage(savedImage,diff,diff,null);

            }else if(angle==270){
                g2.drawImage(savedImage,-diff,-diff,null);

            }else{
                //
            }
        }

        return rotatedImage;
    }

     public static BufferedImage invertImage(final BufferedImage savedImage) {

        final BufferedImage invertedImage;

       
        AffineTransform tx = AffineTransform.getScaleInstance(1, -1);
        tx.translate(0, -savedImage.getHeight(null));
        AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
        invertedImage = op.filter(savedImage, null);

        return invertedImage;
    }
}