2 * Meviz - Various tools collection to work with multimedia.
3 * Copyright (C) 2012, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
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.
10 package eu.svjatoslav.meviz.htmlindexer.metadata.fileTypes;
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;
20 import java.io.FileOutputStream;
21 import java.io.OutputStream;
22 import java.util.ArrayList;
23 import java.util.List;
25 import javax.imageio.ImageIO;
26 import javax.swing.ImageIcon;
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;
33 public class Picture extends AbstractFile {
35 private static final long serialVersionUID = -4156533490858298387L;
37 private static void ensureNonzeroImageArea(final java.awt.Dimension result) {
40 if (result.height < 1)
45 * Actual returned target thumbnail size will be adjusted from desired one
46 * by attempting to generate as large as possible thumbnail, while not
47 * exceeding provided thumbnail width and height, and preserving aspect
48 * ratio of original image.
50 public static java.awt.Dimension getTargetThumbnailDimension(
51 final java.awt.Dimension originalImageDimension,
52 final java.awt.Dimension desiredTargetDimension) {
54 final double thumbWidthToHeightRatio = (double) desiredTargetDimension.width
55 / (double) desiredTargetDimension.height;
56 final double inputImageWidthToHeightRatio = (double) originalImageDimension.width
57 / (double) originalImageDimension.height;
59 if (thumbWidthToHeightRatio < inputImageWidthToHeightRatio) {
61 final java.awt.Dimension result = new java.awt.Dimension(
62 desiredTargetDimension.width,
63 (int) (desiredTargetDimension.width / inputImageWidthToHeightRatio));
65 ensureNonzeroImageArea(result);
70 final java.awt.Dimension result = new java.awt.Dimension(
71 (int) (desiredTargetDimension.height * inputImageWidthToHeightRatio),
72 desiredTargetDimension.height);
74 ensureNonzeroImageArea(result);
81 * Propose list of thumbnail dimensions.
83 public static List<Dimension> getThumbnailDimensions(Dimension current) {
84 final ArrayList<Dimension> result = new ArrayList<Dimension>();
87 while (current.getArea() > 1000000) {
88 current = current.getScaled(0.5d);
96 public static void makeThumbnail(final File inputFile,
97 final File outputFile,
98 final java.awt.Dimension preferredTargetDimensions) {
102 final BufferedImage inputImage = Utils.getBufferedImage(inputFile);
104 final java.awt.Dimension sourceImageDimension = new java.awt.Dimension(
105 inputImage.getWidth(), inputImage.getHeight());
107 final java.awt.Dimension targetDimensions = getTargetThumbnailDimension(
108 sourceImageDimension, preferredTargetDimensions);
110 final OutputStream out = new FileOutputStream(outputFile);
112 final Image scaledImage = scaleImage(inputImage,
113 targetDimensions.width, targetDimensions.height);
115 final BufferedImage bufferedImage = new BufferedImage(
116 scaledImage.getWidth(null), scaledImage.getHeight(null),
117 BufferedImage.TYPE_INT_RGB);
119 final Graphics2D g = bufferedImage.createGraphics();
120 g.drawImage(scaledImage, 0, 0, null);
123 ImageIO.write(bufferedImage, "jpg", out);
126 } catch (final Exception exception) {
127 System.out.println(exception.toString());
128 exception.printStackTrace();
133 * @return new image scaled to desired dimensions
135 public static Image scaleImage(final Image srcImage, final int width,
138 final ImageFilter filter = new java.awt.image.AreaAveragingScaleFilter(
141 final ImageProducer prod = new FilteredImageSource(
142 srcImage.getSource(), filter);
144 final Image newImage = Toolkit.getDefaultToolkit().createImage(prod);
146 return new ImageIcon(newImage).getImage();
150 * Picture dimensions.
152 private Dimension dimensions;
154 public Picture(final File parentDirectory, final String fileName)
156 super(parentDirectory, fileName);
159 private String computeThumbnailHash(final Dimension targetDimension) {
161 // compute new thumbnails hash number
162 final String forMagicHash = fileName + " "
163 + String.valueOf(targetDimension.width) + " "
164 + String.valueOf(targetDimension.height) + " "
165 + String.valueOf(getFileLength()) + " "
166 + Constants.THUMBNAIL_VERSION;
168 // System.out.println("Computing hash from: " + forMagicHash);
169 return Utils.getStringCrcAsHex(forMagicHash);
172 public Dimension getDimensions() {
177 * Get thumbnail file name for this image and desired thumbnail dimensions
178 * relative to designated thumbnails directory within parent directory.
180 public String getRelativeThumbnailFileName(final Dimension targetDimension) {
181 return FilePathParser.getFileNameWithoutExtension(fileName) + " ("
182 + computeThumbnailHash(targetDimension) + ").jpeg";
186 public void updateFileMetainfo(final File parentDirectory) throws Exception {
187 final BufferedImage image = Utils
188 .getBufferedImage(getFile(parentDirectory));
189 dimensions = new Dimension(image.getWidth(), image.getHeight());