/* 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.activiti.explorer.util;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import org.activiti.explorer.Constants;
import com.thebuzzmedia.imgscalr.Scalr;
import com.thebuzzmedia.imgscalr.Scalr.Mode;
/**
* @author Joram Barrez
*/
public class ImageUtil {
protected static final Logger LOGGER = Logger.getLogger(ImageUtil.class.getName());
/**
* Resizes the given image (passed as {@link InputStream}.
* If the image is smaller then the given maximum width or height, the image
* will be proportionally resized.
*/
public static InputStream smallify(InputStream imageInputStream, String mimeType, int maxWidth, int maxHeight) {
try {
BufferedImage image = ImageIO.read(imageInputStream);
int width = Math.min(image.getWidth(), maxWidth);
int height = Math.min(image.getHeight(), maxHeight);
Mode mode = Mode.AUTOMATIC;
if (image.getHeight() > maxHeight) {
mode = Mode.FIT_TO_HEIGHT;
}
if (width != image.getWidth() || height != image.getHeight()) {
image = Scalr.resize(image, mode, width, height);
}
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ImageIO.write(image, Constants.MIMETYPE_EXTENSION_MAPPING.get(mimeType), bos);
return new ByteArrayInputStream(bos.toByteArray());
} catch (IOException e) {
LOGGER.log(Level.SEVERE, "Exception while resizing image", e);
return null;
}
}
}