/*
* JSwiff is an open source Java API for Macromedia Flash file generation
* and manipulation
*
* Copyright (C) 2004-2006 Ralf Terdic (contact@jswiff.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.jswiff.util;
import com.jswiff.swfrecords.RGBA;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.Locale;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
/**
* Provides utility methods for image processing.
*
* @author <a href="mailto:ralf@terdic.de">Ralf Terdic</a>
*/
public class ImageUtilities {
/**
* Returns the format of an image (as string).
*
* @param stream image source stream
*
* @return format stream (e.g. "JPEG")
*
* @throws IOException if an I/O error occured
*/
public static String getFormat(InputStream stream) throws IOException {
ImageInputStream iis = ImageIO.createImageInputStream(stream);
Iterator iter = ImageIO.getImageReaders(iis);
if (!iter.hasNext()) {
throw new IOException("Unsupported image format!");
}
ImageReader reader = (ImageReader) iter.next();
iis.close();
return reader.getFormatName();
}
/**
* Returns the content of an image as RGBA array.
*
* @param image buffered image
*
* @return image as RGBA array
*/
public static RGBA[] getRGBAArray(BufferedImage image) {
BufferedImage argbImage;
if (image.getType() != BufferedImage.TYPE_INT_ARGB) {
argbImage = convertToARGB(image);
} else {
argbImage = image;
}
int height = argbImage.getHeight();
int width = argbImage.getWidth();
RGBA[] values = new RGBA[height * width];
int i = 0;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int rgb = argbImage.getRGB(x, y); // 0xaarrggbb
int a = ((rgb & 0xff000000) >> 24) & 0xff;
int r = ((rgb & 0xff0000) >> 16) & 0xff;
int g = ((rgb & 0xff00) >> 8) & 0xff;
int b = rgb & 0xff;
values[i++] = new RGBA(r, g, b, a);
}
}
return values;
}
/**
* Loads an image from a stream.
*
* @param stream input stream
*
* @return the loaded image
*
* @throws IOException if the image could not be loaded
*/
public static BufferedImage loadImage(InputStream stream)
throws IOException {
return ImageIO.read(stream);
}
/**
* Writes an image to an output stream as a JPEG file.
*
* @param image image to be written
* @param stream target stream
*
* @throws IOException if an I/O error occured
*/
public static void saveImageAsJPEG(BufferedImage image, OutputStream stream)
throws IOException {
ImageIO.write(image, "jpg", stream);
}
/**
* Writes an image to an output stream as a JPEG file. The JPEG quality can
* be specified in percent.
*
* @param image image to be written
* @param stream target stream
* @param qualityPercent JPEG quality in percent
*
* @throws IOException if an I/O error occured
* @throws IllegalArgumentException if qualityPercent not between 0 and 100
*/
public static void saveImageAsJPEG(
BufferedImage image, OutputStream stream, int qualityPercent)
throws IOException {
if ((qualityPercent < 0) || (qualityPercent > 100)) {
throw new IllegalArgumentException("Quality out of bounds!");
}
float quality = qualityPercent / 100f;
ImageWriter writer = null;
Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
if (iter.hasNext()) {
writer = (ImageWriter) iter.next();
}
ImageOutputStream ios = ImageIO.createImageOutputStream(stream);
writer.setOutput(ios);
ImageWriteParam iwparam = new JPEGImageWriteParam(Locale.getDefault());
iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwparam.setCompressionQuality(quality);
writer.write(null, new IIOImage(image, null, null), iwparam);
ios.flush();
writer.dispose();
ios.close();
}
/**
* Writes an image to an output stream as a PNG file.
*
* @param image image to be written
* @param stream target stream
*
* @throws IOException if an I/O error occured
*/
public static void saveImageAsPNG(BufferedImage image, OutputStream stream)
throws IOException {
ImageIO.write(image, "png", stream);
}
private static BufferedImage convertToARGB(BufferedImage srcImage) {
BufferedImage newImage = new BufferedImage(
srcImage.getWidth(null), srcImage.getHeight(null),
BufferedImage.TYPE_INT_ARGB);
Graphics bg = newImage.getGraphics();
bg.drawImage(srcImage, 0, 0, null);
bg.dispose();
return newImage;
}
}