darwin.util.image.ImageUtil2 Maven / Gradle / Ivy

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/*
 * Copyright (C) 2012 daniel
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package darwin.util.image;

import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;

import darwin.util.misc.IterableFacade;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

/**
 *
 * @author daniel
 */
public class ImageUtil2 {

    public static BufferedImage loadImageByMimeType(Path file) throws IOException {
        String mime = Files.probeContentType(file);
        Iterable iter = new IterableFacade<>(ImageIO.getImageReadersByMIMEType(mime));
        for (ImageReader reader : iter) {
            InputStream in = Files.newInputStream(file);
            try (ImageInputStream ii = ImageIO.createImageInputStream(in);) {
                reader.setInput(ii);
                return reader.read(0);
            }
        }
        throw new IOException("No ImageReader found for the file: " + file);
    }

    public static BufferedImage filter(BufferedImage image, BufferedImageOp op) {
        BufferedImage result = new BufferedImage(image.getWidth(), image.getHeight(), image.getType());
        op.filter(image, result);
        return result;
    }

    //TODO sehr komische ergebnisse bei Bilder vom Type USHORT_GRAY (bilder haben nur noch 3-4 graustufen)
    public static BufferedImage getScaledImage(BufferedImage image, int targetWidth,
                                               int targetHeight, boolean highQuality) {
        int accWidth, accHeight;
        if (highQuality) {
            accHeight = image.getHeight();
            accWidth = image.getWidth();
        } else {
            accHeight = targetHeight;
            accWidth = targetWidth;
        }

        BufferedImage result = image;
        do {
            if (highQuality) {
                accHeight = Math.max(accHeight / 2, targetHeight);
                accWidth = Math.max(accWidth / 2, targetWidth);
            }
            BufferedImage tmp = new BufferedImage(accWidth, accHeight, image.getType());

            Graphics2D g2 = tmp.createGraphics();

            if (highQuality) {
                g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                                    RenderingHints.VALUE_INTERPOLATION_BICUBIC);
            } else {
                g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                                    RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
            }
            g2.drawImage(result, 0, 0, accWidth, accHeight, null);

            result = tmp;
        } while (accHeight != targetHeight && accWidth != targetWidth);

        return result;
    }
}