/*
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* Copyright 2011 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.build;
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import java.awt.Dimension;
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import java.awt.Image;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.FilenameFilter;
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import java.io.IOException;
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import java.text.MessageFormat;
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import java.util.Iterator;
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import javax.imageio.ImageIO;
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import javax.imageio.ImageReader;
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import javax.imageio.stream.ImageInputStream;
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import com.beust.jcommander.JCommander;
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import com.beust.jcommander.Parameter;
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import com.beust.jcommander.ParameterException;
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import com.beust.jcommander.Parameters;
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/**
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* Generates PNG thumbnails of the PNG images from the specified source folder.
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*
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* @author James Moger
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*
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*/
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public class BuildThumbnails {
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public static void main(String[] args) {
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Params params = new Params();
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JCommander jc = new JCommander(params);
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try {
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jc.parse(args);
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} catch (ParameterException t) {
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System.err.println(t.getMessage());
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jc.usage();
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}
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createImageThumbnail(params.sourceFolder, params.destinationFolder, params.maximumDimension);
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}
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/**
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* Generates thumbnails from all PNG images in the source folder and saves
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* them to the destination folder.
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*
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* @param sourceFolder
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* @param destinationFolder
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* @param maxDimension
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* the maximum height or width of the image.
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*/
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public static void createImageThumbnail(String sourceFolder, String destinationFolder,
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int maxDimension) {
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if (maxDimension <= 0) {
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return;
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}
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File source = new File(sourceFolder);
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File destination = new File(destinationFolder);
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destination.mkdirs();
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File[] sourceFiles = source.listFiles(new FilenameFilter() {
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@Override
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public boolean accept(File dir, String name) {
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return name.toLowerCase().endsWith(".png");
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}
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});
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for (File sourceFile : sourceFiles) {
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File destinationFile = new File(destination, sourceFile.getName());
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try {
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Dimension sz = getImageDimensions(sourceFile);
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int w = 0;
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int h = 0;
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if (sz.width > maxDimension) {
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// Scale to Width
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w = maxDimension;
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float f = maxDimension;
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// normalize height
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h = (int) ((f / sz.width) * sz.height);
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} else if (sz.height > maxDimension) {
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// Scale to Height
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h = maxDimension;
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float f = maxDimension;
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// normalize width
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w = (int) ((f / sz.height) * sz.width);
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}
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System.out.println(MessageFormat.format(
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"Generating thumbnail for {0} as ({1,number,#}, {2,number,#})",
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sourceFile.getName(), w, h));
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BufferedImage image = ImageIO.read(sourceFile);
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Image scaledImage = image.getScaledInstance(w, h, BufferedImage.SCALE_SMOOTH);
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BufferedImage destImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
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destImage.createGraphics().drawImage(scaledImage, 0, 0, null);
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FileOutputStream fos = new FileOutputStream(destinationFile);
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ImageIO.write(destImage, "png", fos);
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fos.flush();
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fos.getFD().sync();
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fos.close();
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} catch (Throwable t) {
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t.printStackTrace();
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}
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}
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}
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/**
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* Return the dimensions of the specified image file.
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*
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* @param file
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* @return dimensions of the image
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* @throws IOException
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*/
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public static Dimension getImageDimensions(File file) throws IOException {
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ImageInputStream in = ImageIO.createImageInputStream(file);
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try {
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final Iterator<ImageReader> readers = ImageIO.getImageReaders(in);
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if (readers.hasNext()) {
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ImageReader reader = readers.next();
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try {
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reader.setInput(in);
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return new Dimension(reader.getWidth(0), reader.getHeight(0));
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} finally {
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reader.dispose();
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}
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}
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} finally {
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if (in != null) {
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in.close();
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}
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}
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return null;
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}
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/**
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* JCommander Parameters class for BuildThumbnails.
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*/
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@Parameters(separators = " ")
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private static class Params {
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@Parameter(names = { "--sourceFolder" }, description = "Source folder for raw images", required = true)
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public String sourceFolder;
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@Parameter(names = { "--destinationFolder" }, description = "Destination folder for thumbnails", required = true)
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public String destinationFolder;
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@Parameter(names = { "--maximumDimension" }, description = "Maximum width or height for thumbnail", required = true)
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public int maximumDimension;
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}
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}
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