bjerne.gallery.service.impl.ImageResizeServiceImpl.java Source code

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Here is the source code for bjerne.gallery.service.impl.ImageResizeServiceImpl.java

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/**
 * Copyright (c) 2016 Henrik Bjerne
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:The above copyright
 * notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 */
package bjerne.gallery.service.impl;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import bjerne.gallery.service.ImageResizeService;

/**
 * Java-only implementation of {@link ImageResizeService}. Uses AWT libraries
 * for the scaling.
 * 
 * @author Henrik Bjerne
 *
 */
public class ImageResizeServiceImpl implements ImageResizeService {

    private final Logger LOG = LoggerFactory.getLogger(getClass());

    private Color backgroundColor = new Color(0, 0, 0);

    public void setBackgroundColor(Color backgroundColor) {
        this.backgroundColor = backgroundColor;
    }

    @Override
    public void resizeImage(File origImage, File newImage, int width, int height) throws IOException {
        LOG.debug("Entering resizeImage(origImage={}, width={}, height={})", origImage, width, height);
        long startTime = System.currentTimeMillis();
        InputStream is = new BufferedInputStream(new FileInputStream(origImage));
        BufferedImage i = ImageIO.read(is);
        IOUtils.closeQuietly(is);
        BufferedImage scaledImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        int origWidth = i.getWidth();
        int origHeight = i.getHeight();
        LOG.debug("Original size of image - width: {}, height={}", origWidth, height);
        float widthFactor = ((float) origWidth) / ((float) width);
        float heightFactor = ((float) origHeight) / ((float) height);
        float maxFactor = Math.max(widthFactor, heightFactor);
        int newHeight, newWidth;
        if (maxFactor > 1) {
            newHeight = (int) (((float) origHeight) / maxFactor);
            newWidth = (int) (((float) origWidth) / maxFactor);
        } else {
            newHeight = origHeight;
            newWidth = origWidth;
        }
        LOG.debug("Size of scaled image will be: width={}, height={}", newWidth, newHeight);
        int startX = Math.max((width - newWidth) / 2, 0);
        int startY = Math.max((height - newHeight) / 2, 0);
        Graphics2D scaledGraphics = scaledImage.createGraphics();
        scaledGraphics.setColor(backgroundColor);
        scaledGraphics.fillRect(0, 0, width, height);
        scaledGraphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        scaledGraphics.drawImage(i, startX, startY, newWidth, newHeight, null);
        OutputStream resultImageOutputStream = new BufferedOutputStream(FileUtils.openOutputStream(newImage));
        String extension = FilenameUtils.getExtension(origImage.getName());
        ImageIO.write(scaledImage, extension, resultImageOutputStream);
        IOUtils.closeQuietly(resultImageOutputStream);
        long duration = System.currentTimeMillis() - startTime;
        LOG.debug("Time in milliseconds to scale {}: {}", newImage.toString(), duration);
    }

}