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/*
* Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.sun.opengl.util.awt;
import java.awt.*;
import java.awt.image.*;
/** Utilities for dealing with images. */
public class ImageUtil {
private ImageUtil() {}
/** Flips the supplied BufferedImage vertically. This is often a
necessary conversion step to display a Java2D image correctly
with OpenGL and vice versa. */
public static void flipImageVertically(BufferedImage image) {
WritableRaster raster = image.getRaster();
Object scanline1 = null;
Object scanline2 = null;
for (int i = 0; i < image.getHeight() / 2; i++) {
scanline1 = raster.getDataElements(0, i, image.getWidth(), 1, scanline1);
scanline2 = raster.getDataElements(0, image.getHeight() - i - 1, image.getWidth(), 1, scanline2);
raster.setDataElements(0, i, image.getWidth(), 1, scanline2);
raster.setDataElements(0, image.getHeight() - i - 1, image.getWidth(), 1, scanline1);
}
}
/**
* Creates a <code>BufferedImage</code> with a pixel format compatible with the graphics
* environment. The returned image can thus benefit from hardware accelerated operations
* in Java2D API.
*
* @param width The width of the image to be created
* @param height The height of the image to be created
*
* @return A instance of <code>BufferedImage</code> with a type compatible with the graphics card.
*/
public static BufferedImage createCompatibleImage(int width, int height) {
GraphicsConfiguration configuration =
GraphicsEnvironment.getLocalGraphicsEnvironment().
getDefaultScreenDevice().getDefaultConfiguration();
return configuration.createCompatibleImage(width, height);
}
/**
* Creates a thumbnail from an image. A thumbnail is a scaled down version of the original picture.
* This method will retain the width to height ratio of the original picture and return a new
* instance of <code>BufferedImage</code>. The original picture is not modified.
*
* @param image The original image to sample down
* @param thumbWidth The width of the thumbnail to be created
*
* @throws IllegalArgumentException If thumbWidth is greater than image.getWidth()
*
* @return A thumbnail with the requested width or the original picture if thumbWidth = image.getWidth()
*/
public static BufferedImage createThumbnail(BufferedImage image, int thumbWidth) {
// Thanks to Romain Guy for this utility
if (thumbWidth > image.getWidth()) {
throw new IllegalArgumentException("Thumbnail width must be greater than image width");
}
if (thumbWidth == image.getWidth()) {
return image;
}
float ratio = (float) image.getWidth() / (float) image.getHeight();
int width = image.getWidth();
BufferedImage thumb = image;
do {
width /= 2;
if (width < thumbWidth) {
width = thumbWidth;
}
BufferedImage temp = createCompatibleImage(width, (int) (width / ratio));
Graphics2D g2 = temp.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(thumb, 0, 0, temp.getWidth(), temp.getHeight(), null);
g2.dispose();
thumb = temp;
} while (width != thumbWidth);
return thumb;
}
}
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