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