2 * Meviz - Various tools collection to work with multimedia.
3 * Copyright (C) 2012 -- 2018, 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 eu.svjatoslav.commons.file.FilePathParser;
13 import eu.svjatoslav.meviz.htmlindexer.Constants;
14 import eu.svjatoslav.meviz.htmlindexer.Utils;
15 import eu.svjatoslav.meviz.htmlindexer.metadata.Dimension;
17 import javax.imageio.ImageIO;
20 import java.awt.image.BufferedImage;
21 import java.awt.image.FilteredImageSource;
22 import java.awt.image.ImageFilter;
23 import java.awt.image.ImageProducer;
25 import java.io.FileOutputStream;
26 import java.io.OutputStream;
27 import java.util.ArrayList;
28 import java.util.List;
30 import static eu.svjatoslav.meviz.htmlindexer.Utils.getBufferedImage;
32 public class Picture extends AbstractFile {
34 private static final long serialVersionUID = -4156533490858298387L;
38 private Dimension dimensions;
40 public Picture(final File parentDirectory, final String fileName)
42 super(parentDirectory, fileName);
45 private static void ensureNonzeroImageArea(final java.awt.Dimension result) {
48 if (result.height < 1)
53 * Actual returned target thumbnail size will be adjusted from desired one
54 * by attempting to generate as large as possible thumbnail, while not
55 * exceeding provided thumbnail width and height, and preserving aspect
56 * ratio of original image.
58 private static java.awt.Dimension getTargetThumbnailDimension(
59 final java.awt.Dimension originalImageDimension,
60 final java.awt.Dimension desiredTargetDimension) {
62 final double thumbWidthToHeightRatio = (double) desiredTargetDimension.width
63 / (double) desiredTargetDimension.height;
64 final double inputImageWidthToHeightRatio = (double) originalImageDimension.width
65 / (double) originalImageDimension.height;
67 if (thumbWidthToHeightRatio < inputImageWidthToHeightRatio) {
69 final java.awt.Dimension result = new java.awt.Dimension(
70 desiredTargetDimension.width,
71 (int) (desiredTargetDimension.width / inputImageWidthToHeightRatio));
73 ensureNonzeroImageArea(result);
78 final java.awt.Dimension result = new java.awt.Dimension(
79 (int) (desiredTargetDimension.height * inputImageWidthToHeightRatio),
80 desiredTargetDimension.height);
82 ensureNonzeroImageArea(result);
89 * Propose list of thumbnail dimensions.
91 public static List<Dimension> getThumbnailDimensions(Dimension current) {
92 final ArrayList<Dimension> result = new ArrayList<>();
95 while (current.getArea() > 1000000) {
96 current = current.getScaled(0.5d);
104 public static void makeThumbnail(final File inputFile,
105 final File outputFile,
106 final java.awt.Dimension preferredTargetDimensions) {
110 final BufferedImage inputImage = getBufferedImage(inputFile);
112 final java.awt.Dimension sourceImageDimension = new java.awt.Dimension(
113 inputImage.getWidth(), inputImage.getHeight());
115 final java.awt.Dimension targetDimensions = getTargetThumbnailDimension(
116 sourceImageDimension, preferredTargetDimensions);
118 final OutputStream out = new FileOutputStream(outputFile);
120 final Image scaledImage = scaleImage(inputImage,
121 targetDimensions.width, targetDimensions.height);
123 final BufferedImage bufferedImage = new BufferedImage(
124 scaledImage.getWidth(null), scaledImage.getHeight(null),
125 BufferedImage.TYPE_INT_RGB);
127 final Graphics2D g = bufferedImage.createGraphics();
128 g.drawImage(scaledImage, 0, 0, null);
131 ImageIO.write(bufferedImage, "jpg", out);
134 } catch (final Exception exception) {
135 System.out.println(exception.toString());
136 exception.printStackTrace();
141 * @return new image scaled to desired dimensions
143 private static Image scaleImage(final Image srcImage, final int width,
146 final ImageFilter filter = new java.awt.image.AreaAveragingScaleFilter(
149 final ImageProducer prod = new FilteredImageSource(
150 srcImage.getSource(), filter);
152 final Image newImage = Toolkit.getDefaultToolkit().createImage(prod);
154 return new ImageIcon(newImage).getImage();
157 private String computeThumbnailHash(final Dimension targetDimension) {
159 // compute new thumbnails hash number
160 final String forMagicHash = fileName + " "
161 + String.valueOf(targetDimension.width) + " "
162 + String.valueOf(targetDimension.height) + " "
163 + String.valueOf(getFileLength()) + " "
164 + Constants.THUMBNAIL_VERSION;
166 // System.out.println("Computing hash from: " + forMagicHash);
167 return Utils.getStringCrcAsHex(forMagicHash);
170 public Dimension getDimensions() {
175 * Get thumbnail file name for this image and desired thumbnail dimensions
176 * relative to designated thumbnails directory within parent directory.
178 public String getRelativeThumbnailFileName(final Dimension targetDimension) {
179 return FilePathParser.getFileNameWithoutExtension(fileName) + " ("
180 + computeThumbnailHash(targetDimension) + ").jpeg";
184 public void updateFileMetadata(final File parentDirectory) throws Exception {
185 final BufferedImage image = getBufferedImage(getFile(parentDirectory));
186 dimensions = new Dimension(image.getWidth(), image.getHeight());