+++ /dev/null
-/*
- * Copyright 2006 the original author or authors.
- *
- * 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.wamblee.utils;
-
-import java.awt.Container;
-import java.awt.Graphics2D;
-import java.awt.Image;
-import java.awt.MediaTracker;
-import java.awt.RenderingHints;
-import java.awt.image.BufferedImage;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-
-import com.sun.image.codec.jpeg.JPEGCodec;
-import com.sun.image.codec.jpeg.JPEGEncodeParam;
-import com.sun.image.codec.jpeg.JPEGImageDecoder;
-import com.sun.image.codec.jpeg.JPEGImageEncoder;
-
-/**
- * Utility functions for processing JPEG images.
- *
- * @author Erik Brakkee
- */
-public class JpegUtils {
- /**
- * Scales an image preserving the aspect ratio.
- *
- * @param aMaxWidth Maximum width.
- * @param aMaxHeight Maximum height.
- * @param aImage Image to scale.
- * @return Scaled image.
- */
- public static BufferedImage scaleImage(int aMaxWidth, int aMaxHeight, Image aImage) {
- double thumbRatio = (double) aMaxWidth / (double) aMaxHeight;
- int imageWidth = aImage.getWidth(null);
- int imageHeight = aImage.getHeight(null);
- double imageRatio = (double) imageWidth / (double) imageHeight;
- if (thumbRatio < imageRatio) {
- aMaxHeight = (int) (aMaxWidth / imageRatio);
- } else {
- aMaxWidth = (int) (aMaxHeight * imageRatio);
- }
- BufferedImage thumbImage = new BufferedImage(aMaxWidth, aMaxHeight,
- BufferedImage.TYPE_INT_RGB);
- Graphics2D graphics2D = thumbImage.createGraphics();
- graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
- RenderingHints.VALUE_INTERPOLATION_BILINEAR);
- graphics2D.drawImage(aImage, 0, 0, aMaxWidth, aMaxHeight, null);
- return thumbImage;
- }
-
- /**
- * Loads a jpeg image from an input stream.
- *
- * @param aInput Input stream.
- * @return JPEG image.
- * @throws IOException In case of IO problems.
- * @throws InterruptedException When execution is interrupted.
- */
- public static BufferedImage loadJpegImage(InputStream aInput) throws IOException, InterruptedException {
- JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(aInput);
- BufferedImage image = decoder.decodeAsBufferedImage();
- MediaTracker mediaTracker = new MediaTracker(new Container());
- mediaTracker.addImage(image, 0);
- mediaTracker.waitForID(0);
- return image;
- }
-
- /**
- * Writes a JPEG image.
- *
- * @param aOutput Output stream to write to.
- * @param aQuality Quality of the JPEG image in the range 0..100
- * @param aThumbImage
- * @throws IOException
- */
- public static void writeJpegImage(OutputStream aOutput, int aQuality, BufferedImage aThumbImage) throws IOException {
- // save thumbnail image to OUTFILE
-
- if ( aQuality < 0 || aQuality > 100 ) {
- throw new IllegalArgumentException("Argument quality must be in range 0.100: " + aQuality);
- }
-
- JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(aOutput);
- JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(aThumbImage);
- aQuality = Math.max(0, Math.min(aQuality, 100));
- param.setQuality((float) aQuality / 100.0f, false);
- encoder.setJPEGEncodeParam(param);
- encoder.encode(aThumbImage);
- }
-
-}
-