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.IOException;
22 import java.io.OutputStream;
23 import java.util.ArrayList;
24 import java.util.List;
26 import javax.imageio.ImageIO;
27 import javax.swing.ImageIcon;
29 import eu.svjatoslav.commons.file.FilePathParser;
30 import eu.svjatoslav.meviz.htmlindexer.Constants;
31 import eu.svjatoslav.meviz.htmlindexer.ImageFormatError;
32 import eu.svjatoslav.meviz.htmlindexer.Utils;
33 import eu.svjatoslav.meviz.htmlindexer.metadata.Dimension;
35 public class Picture extends AbstractFile {
37 private static final long serialVersionUID = -4156533490858298387L;
42 private Dimension dimensions;
44 public Picture(final File parentDirectory, final String fileName)
45 throws IOException, ImageFormatError {
46 super(parentDirectory, fileName);
49 private String computeThumbnailHash(final Dimension targetDimension) {
51 // compute new thumbnails hash number
52 final String forMagicHash = fileName + " "
53 + String.valueOf(targetDimension.width) + " "
54 + String.valueOf(targetDimension.height) + " "
55 + String.valueOf(getFileLength()) + " "
56 + Constants.THUMBNAIL_VERSION;
58 // System.out.println("Computing hash from: " + forMagicHash);
59 return Utils.getStringCrcAsHex(forMagicHash);
62 public Dimension getDimensions() {
67 * Get thumbnail file name for this image and desired thumbnail dimensions
68 * relative to designated thumbnails directory within parent directory.
70 public String getRelativeThumbnailFileName(final Dimension targetDimension) {
71 return FilePathParser.getFileNameWithoutExtension(fileName) + " ("
72 + computeThumbnailHash(targetDimension) + ").jpeg";
76 public void updateFileMetainfo(final File parentDirectory)
80 image = Utils.getBufferedImage(getFile(parentDirectory));
81 } catch (final ImageFormatError e) {
82 throw new RuntimeException(e);
84 dimensions = new Dimension(image.getWidth(), image.getHeight());
88 * Actual returned target thumbnail size will be adjusted from desired one
89 * by attempting to generate as large as possible thumbnail, while not
90 * exceeding provided thumbnail width and height, and preserving aspect
91 * ratio of original image.
93 public static java.awt.Dimension getTargetThumbnailDimension(
94 final java.awt.Dimension originalImageDimension,
95 final java.awt.Dimension desiredTargetDimension) {
97 final double thumbWidthToHeightRatio = (double) desiredTargetDimension.width
98 / (double) desiredTargetDimension.height;
99 final double inputImageWidthToHeightRatio = (double) originalImageDimension.width
100 / (double) originalImageDimension.height;
102 if (thumbWidthToHeightRatio < inputImageWidthToHeightRatio) {
104 final java.awt.Dimension result = new java.awt.Dimension(
105 desiredTargetDimension.width,
106 (int) (desiredTargetDimension.width / inputImageWidthToHeightRatio));
111 final java.awt.Dimension result = new java.awt.Dimension(
112 (int) (desiredTargetDimension.height * inputImageWidthToHeightRatio),
113 desiredTargetDimension.height);
120 * Propose list of thumbnail dimensions.
122 public static List<Dimension> getThumbnailDimensions(Dimension current) {
123 final ArrayList<Dimension> result = new ArrayList<Dimension>();
126 while (current.getArea() > 100000) {
127 current = current.getScaled(0.5d);
135 public static void makeThumbnail(final File inputFile,
136 final File outputFile,
137 final java.awt.Dimension preferredTargetDimensions) {
141 final BufferedImage inputImage = Utils.getBufferedImage(inputFile);
143 final java.awt.Dimension sourceImageDimension = new java.awt.Dimension(
144 inputImage.getWidth(), inputImage.getHeight());
146 final java.awt.Dimension targetDimensions = getTargetThumbnailDimension(
147 sourceImageDimension, preferredTargetDimensions);
149 final OutputStream out = new FileOutputStream(outputFile);
151 final Image scaledImage = scaleImage(inputImage,
152 targetDimensions.width, targetDimensions.height);
154 final BufferedImage bufferedImage = new BufferedImage(
155 scaledImage.getWidth(null), scaledImage.getHeight(null),
156 BufferedImage.TYPE_INT_RGB);
158 final Graphics2D g = bufferedImage.createGraphics();
159 g.drawImage(scaledImage, 0, 0, null);
162 ImageIO.write(bufferedImage, "jpg", out);
165 } catch (final Exception exception) {
166 System.out.println(exception.toString());
167 exception.printStackTrace();
172 * @return new image scaled to desired dimensions
174 public static Image scaleImage(final Image srcImage, final int width,
178 filter = new java.awt.image.AreaAveragingScaleFilter(width, height);
180 final ImageProducer prod = new FilteredImageSource(
181 srcImage.getSource(), filter);
183 final Image newImage = Toolkit.getDefaultToolkit().createImage(prod);
185 final ImageIcon imageIcon = new ImageIcon(newImage);
186 return imageIcon.getImage();