/*
* Copyright (c) 2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wso2.carbon.dashboard.social.ui;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.JPEGTranscoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
public class ImageScalerUtil {
private int thubmnailArraySize = 0;
public InputStream scaleImage(InputStream input, int height, int width, int quality)
throws Exception {
Image image = ImageIO.read(new BufferedInputStream(input));
if (image == null) {
throw new Exception("Unable to change/upload profile Image");
}
// Maintain Aspect ratio
int thumbHeight = height;
int thumbWidth = width;
double thumbRatio = (double) width / (double) height;
double imageRatio = (double) image.getWidth(null) / (double) image.getHeight(null);
if (thumbRatio < imageRatio) {
thumbHeight = (int) (thumbWidth / imageRatio);
} else {
thumbWidth = (int) (thumbHeight * imageRatio);
}
BufferedImage thumb =
new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = thumb.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
ByteArrayOutputStream output = new ByteArrayOutputStream();
JPEGTranscoder transcoder = new JPEGTranscoder();
transcoder.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, new Float(
Math.max(0, Math.min(quality, 100)) / 100.0f));
transcoder.writeImage(thumb, new TranscoderOutput(output));
thubmnailArraySize = output.size();
return new ByteArrayInputStream(output.toByteArray());
}
public int getThubmnailArraySize() {
return thubmnailArraySize;
}
}