org.jpedal.parser.image.ImageUtils 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
*
* ---------------
* 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);
}
}
return rotatedImage;
}
public static BufferedImage invertImage(final BufferedImage savedImage) {
final BufferedImage invertedImage;
final AffineTransform tx = AffineTransform.getScaleInstance(1, -1);
tx.translate(0, -savedImage.getHeight(null));
final AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
invertedImage = op.filter(savedImage, null);
return invertedImage;
}
}