git.basschouten.com Git - openhab-addons.git/blob

   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.nuvo.internal.communication;
  14
  15 import java.awt.AlphaComposite;
  16 import java.awt.Graphics2D;
  17 import java.awt.Image;
  18 import java.awt.RenderingHints;
  19 import java.awt.image.BufferedImage;
  20 import java.io.ByteArrayInputStream;
  21 import java.io.ByteArrayOutputStream;
  22 import java.io.IOException;
  23
  24 import javax.imageio.ImageIO;
  25
  26 import org.eclipse.jdt.annotation.NonNullByDefault;
  27
  28 /**
  29  * The {@link NuvoImageResizer} class contains methods for re-sizing album art
  30  *
  31  * @author Michael Lobstein - Initial contribution
  32  */
  33 @NonNullByDefault
  34 public class NuvoImageResizer {
  35     private static final String EXTENSION_JPG = "jpg";
  36     private static final byte[] NO_IMAGE = { 0 };
  37
  38     public static byte[] resizeImage(byte[] inputImage, int width, int height) {
  39         try {
  40             BufferedImage image = ImageIO.read(new ByteArrayInputStream(inputImage));
  41             Image originalImage = image.getScaledInstance(width, height, Image.SCALE_DEFAULT);
  42
  43             int type = ((image.getType() == 0) ? BufferedImage.TYPE_INT_ARGB : image.getType());
  44             BufferedImage resizedImage = new BufferedImage(width, height, type);
  45
  46             Graphics2D g2d = resizedImage.createGraphics();
  47
  48             g2d.setComposite(AlphaComposite.Src);
  49             g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  50             g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
  51             g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  52
  53             g2d.drawImage(originalImage, 0, 0, width, height, null);
  54             g2d.dispose();
  55
  56             ByteArrayOutputStream baos = new ByteArrayOutputStream();
  57             ImageIO.write(resizedImage, EXTENSION_JPG, baos);
  58             return baos.toByteArray();
  59         } catch (IOException e) {
  60             return NO_IMAGE;
  61         }
  62     }
  63 }