src/main/java/eu/svjatoslav/meviz/htmlindexer/metadata/fileTypes/Picture.java

   1 /*
   2  * Meviz - Various tools collection to work with multimedia.
   3  * Copyright (C) 2012, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public License
   7  * as published by the Free Software Foundation.
   8  */
   9
  10 package eu.svjatoslav.meviz.htmlindexer.metadata.fileTypes;
  11
  12 import java.awt.Graphics2D;
  13 import java.awt.Image;
  14 import java.awt.Toolkit;
  15 import java.awt.image.BufferedImage;
  16 import java.awt.image.FilteredImageSource;
  17 import java.awt.image.ImageFilter;
  18 import java.awt.image.ImageProducer;
  19 import java.io.File;
  20 import java.io.FileOutputStream;
  21 import java.io.OutputStream;
  22 import java.util.ArrayList;
  23 import java.util.List;
  24
  25 import javax.imageio.ImageIO;
  26 import javax.swing.ImageIcon;
  27
  28 import eu.svjatoslav.commons.file.FilePathParser;
  29 import eu.svjatoslav.meviz.htmlindexer.Constants;
  30 import eu.svjatoslav.meviz.htmlindexer.Utils;
  31 import eu.svjatoslav.meviz.htmlindexer.metadata.Dimension;
  32
  33 public class Picture extends AbstractFile {
  34
  35         /**
  36          * Actual returned target thumbnail size will be adjusted from desired one
  37          * by attempting to generate as large as possible thumbnail, while not
  38          * exceeding provided thumbnail width and height, and preserving aspect
  39          * ratio of original image.
  40          */
  41         public static java.awt.Dimension getTargetThumbnailDimension(
  42                         final java.awt.Dimension originalImageDimension,
  43                         final java.awt.Dimension desiredTargetDimension) {
  44
  45                 final double thumbWidthToHeightRatio = (double) desiredTargetDimension.width
  46                                 / (double) desiredTargetDimension.height;
  47                 final double inputImageWidthToHeightRatio = (double) originalImageDimension.width
  48                                 / (double) originalImageDimension.height;
  49
  50                 if (thumbWidthToHeightRatio < inputImageWidthToHeightRatio) {
  51
  52                         final java.awt.Dimension result = new java.awt.Dimension(
  53                                         desiredTargetDimension.width,
  54                                         (int) (desiredTargetDimension.width / inputImageWidthToHeightRatio));
  55
  56                         return result;
  57                 } else {
  58
  59                         final java.awt.Dimension result = new java.awt.Dimension(
  60                                         (int) (desiredTargetDimension.height * inputImageWidthToHeightRatio),
  61                                         desiredTargetDimension.height);
  62
  63                         return result;
  64                 }
  65         }
  66
  67         /**
  68          * Propose list of thumbnail dimensions.
  69          */
  70         public static List<Dimension> getThumbnailDimensions(Dimension current) {
  71                 final ArrayList<Dimension> result = new ArrayList<Dimension>();
  72                 result.add(current);
  73
  74                 while (current.getArea() > 1000000) {
  75                         current = current.getScaled(0.5d);
  76                         result.add(current);
  77                 }
  78
  79                 return result;
  80
  81         }
  82
  83         public static void makeThumbnail(final File inputFile,
  84                         final File outputFile,
  85                         final java.awt.Dimension preferredTargetDimensions) {
  86
  87                 try {
  88
  89                         final BufferedImage inputImage = Utils.getBufferedImage(inputFile);
  90
  91                         final java.awt.Dimension sourceImageDimension = new java.awt.Dimension(
  92                                         inputImage.getWidth(), inputImage.getHeight());
  93
  94                         final java.awt.Dimension targetDimensions = getTargetThumbnailDimension(
  95                                         sourceImageDimension, preferredTargetDimensions);
  96
  97                         final OutputStream out = new FileOutputStream(outputFile);
  98
  99                         final Image scaledImage = scaleImage(inputImage,
 100                                         targetDimensions.width, targetDimensions.height);
 101
 102                         final BufferedImage bufferedImage = new BufferedImage(
 103                                         scaledImage.getWidth(null), scaledImage.getHeight(null),
 104                                         BufferedImage.TYPE_INT_RGB);
 105
 106                         final Graphics2D g = bufferedImage.createGraphics();
 107                         g.drawImage(scaledImage, 0, 0, null);
 108                         g.dispose();
 109
 110                         ImageIO.write(bufferedImage, "jpg", out);
 111                         out.close();
 112
 113                 } catch (final Exception exception) {
 114                         System.out.println(exception.toString());
 115                         exception.printStackTrace();
 116                 }
 117         }
 118
 119         /**
 120          * @return new image scaled to desired dimensions
 121          */
 122         public static Image scaleImage(final Image srcImage, final int width,
 123                         final int height) {
 124
 125                 ImageFilter filter;
 126                 filter = new java.awt.image.AreaAveragingScaleFilter(width, height);
 127
 128                 final ImageProducer prod = new FilteredImageSource(
 129                                 srcImage.getSource(), filter);
 130
 131                 final Image newImage = Toolkit.getDefaultToolkit().createImage(prod);
 132
 133                 final ImageIcon imageIcon = new ImageIcon(newImage);
 134                 return imageIcon.getImage();
 135         }
 136
 137         private static final long serialVersionUID = -4156533490858298387L;;
 138
 139         /**
 140          * Picture dimensions.
 141          */
 142         private Dimension dimensions;
 143
 144         public Picture(final File parentDirectory, final String fileName)
 145                         throws Exception {
 146                 super(parentDirectory, fileName);
 147         }
 148
 149         private String computeThumbnailHash(final Dimension targetDimension) {
 150
 151                 // compute new thumbnails hash number
 152                 final String forMagicHash = fileName + " "
 153                                 + String.valueOf(targetDimension.width) + " "
 154                                 + String.valueOf(targetDimension.height) + " "
 155                                 + String.valueOf(getFileLength()) + " "
 156                                 + Constants.THUMBNAIL_VERSION;
 157
 158                 // System.out.println("Computing hash from: " + forMagicHash);
 159                 return Utils.getStringCrcAsHex(forMagicHash);
 160         }
 161
 162         public Dimension getDimensions() {
 163                 return dimensions;
 164         }
 165
 166         /**
 167          * Get thumbnail file name for this image and desired thumbnail dimensions
 168          * relative to designated thumbnails directory within parent directory.
 169          */
 170         public String getRelativeThumbnailFileName(final Dimension targetDimension) {
 171                 return FilePathParser.getFileNameWithoutExtension(fileName) + " ("
 172                                 + computeThumbnailHash(targetDimension) + ").jpeg";
 173         }
 174
 175         @Override
 176         public void updateFileMetainfo(final File parentDirectory) throws Exception {
 177                 final BufferedImage image = Utils
 178                                 .getBufferedImage(getFile(parentDirectory));
 179                 dimensions = new Dimension(image.getWidth(), image.getHeight());
 180         }
 181
 182 }