2 * Meviz - Various tools collection to work with multimedia.
3 * Copyright (C) 2012 -- 2019, 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 3 of the GNU Lesser General Public License
7 * or later 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;
31 import static java.awt.image.BufferedImage.TYPE_INT_RGB;
33 public class Picture extends AbstractFile {
35 private static final long serialVersionUID = -4156533490858298387L;
39 private Dimension dimensions;
41 public Picture(final File parentDirectory, final String fileName)
43 super(parentDirectory, fileName);
46 private static void ensureNonzeroImageArea(final java.awt.Dimension result) {
49 if (result.height < 1)
54 * Actual returned target thumbnail size will be adjusted from desired one
55 * by attempting to generate as large as possible thumbnail, while not
56 * exceeding provided thumbnail width and height, and preserving aspect
57 * ratio of original image.
59 private static java.awt.Dimension getTargetThumbnailDimension(
60 final java.awt.Dimension originalImageDimension,
61 final java.awt.Dimension desiredTargetDimension) {
63 final double thumbWidthToHeightRatio = (double) desiredTargetDimension.width
64 / (double) desiredTargetDimension.height;
65 final double inputImageWidthToHeightRatio = (double) originalImageDimension.width
66 / (double) originalImageDimension.height;
68 if (thumbWidthToHeightRatio < inputImageWidthToHeightRatio) {
70 final java.awt.Dimension result = new java.awt.Dimension(
71 desiredTargetDimension.width,
72 (int) (desiredTargetDimension.width / inputImageWidthToHeightRatio));
74 ensureNonzeroImageArea(result);
79 final java.awt.Dimension result = new java.awt.Dimension(
80 (int) (desiredTargetDimension.height * inputImageWidthToHeightRatio),
81 desiredTargetDimension.height);
83 ensureNonzeroImageArea(result);
90 * Propose list of thumbnail dimensions.
92 public static List<Dimension> getThumbnailDimensions(Dimension current) {
93 final ArrayList<Dimension> result = new ArrayList<>();
96 while (current.getArea() > 1000000) {
97 current = current.getScaled(0.5d);
105 public static void makeThumbnail(final File inputFile,
106 final File outputFile,
107 final java.awt.Dimension preferredTargetDimensions) {
111 final BufferedImage inputImage = getBufferedImage(inputFile);
113 final java.awt.Dimension sourceImageDimension = new java.awt.Dimension(
114 inputImage.getWidth(), inputImage.getHeight());
116 final java.awt.Dimension targetDimensions = getTargetThumbnailDimension(
117 sourceImageDimension, preferredTargetDimensions);
119 final OutputStream out = new FileOutputStream(outputFile);
121 final Image scaledImage = scaleImage(inputImage,
122 targetDimensions.width, targetDimensions.height);
124 final BufferedImage bufferedImage = new BufferedImage(
125 scaledImage.getWidth(null), scaledImage.getHeight(null),
128 final Graphics2D g = bufferedImage.createGraphics();
129 g.drawImage(scaledImage, 0, 0, null);
132 ImageIO.write(bufferedImage, "jpg", out);
135 } catch (final Exception exception) {
136 System.out.println(exception.toString());
137 exception.printStackTrace();
142 * @return new image scaled to desired dimensions
144 private static Image scaleImage(final Image srcImage, final int width,
147 final ImageFilter filter = new java.awt.image.AreaAveragingScaleFilter(
150 final ImageProducer prod = new FilteredImageSource(
151 srcImage.getSource(), filter);
153 final Image newImage = Toolkit.getDefaultToolkit().createImage(prod);
155 return new ImageIcon(newImage).getImage();
158 private String computeThumbnailHash(final Dimension targetDimension) {
160 // compute new thumbnails hash number
161 final String forMagicHash = fileName + " "
162 + targetDimension.width + " "
163 + targetDimension.height + " "
164 + getFileLength() + " "
165 + Constants.THUMBNAIL_VERSION;
167 // System.out.println("Computing hash from: " + forMagicHash);
168 return Utils.getStringCrcAsHex(forMagicHash);
171 public Dimension getDimensions() {
176 * Get thumbnail file name for this image and desired thumbnail dimensions
177 * relative to designated thumbnails directory within parent directory.
179 public String getRelativeThumbnailFileName(final Dimension targetDimension) {
180 return FilePathParser.getFileNameWithoutExtension(fileName) + " ("
181 + computeThumbnailHash(targetDimension) + ")." + getFileExtension();
185 public void updateFileMetadata(final File parentDirectory) throws Exception {
186 final BufferedImage image = getBufferedImage(getFile(parentDirectory));
187 dimensions = new Dimension(image.getWidth(), image.getHeight());