/*
* $RCSfile: ImageScaler.java,v $
*
* Copyright (c) 2007 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, licensed or
* intended for use in the design, construction, operation or
* maintenance of any nuclear facility.
*
* $Revision: 1.4 $
* $Date: 2007/02/09 17:20:07 $
* $State: Exp $
*/
package com.sun.j3d.loaders.lw3d;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
/**
* This class resizes an image to be the nearest power of 2 wide and high.
* This facility now exists inside of the TextureLoader class, so
* ImageScaler should be eliminated at some point.
*/
class ImageScaler {
int origW, origH;
Image origImage;
ImageScaler(Image image, int w, int h) {
origImage = image;
origW = w;
origH = h;
}
ImageScaler(BufferedImage image) {
origImage = image;
origW = image.getWidth();
origH = image.getHeight();
}
/**
* Utility method to return closes poser of 2 to the given integer
*/
int getClosestPowerOf2(int value) {
if (value < 1)
return value;
int powerValue = 1;
for (int i = 1; i < 20; ++i) {
powerValue *= 2;
if (value < powerValue) {
// Found max bound of power, determine which is closest
int minBound = powerValue/2;
if ((powerValue - value) >
(value - minBound))
return minBound;
else
return powerValue;
}
}
// shouldn't reach here...
return 1;
}
/**
* Returns an Image that has been scaled from the original image to
* the closest power of 2
*/
Image getScaledImage() {
int newWidth = getClosestPowerOf2(origW);
int newHeight = getClosestPowerOf2(origH);
// If the image is already a power of 2 wide/tall, no need to scale
if (newWidth == origW &&
newHeight == origH)
return origImage;
Image scaledImage = null;
if (origImage instanceof BufferedImage) {
// If BufferedImage, then we have some work to do
BufferedImage origImageB = (BufferedImage)origImage;
scaledImage =
new BufferedImage(newWidth,
newHeight,
origImageB.getType());
BufferedImage scaledImageB = (BufferedImage)scaledImage;
float widthScale = (float)origW/(float)newWidth;
float heightScale = (float)origH/(float)newHeight;
int origPixels[] = ((DataBufferInt)origImageB.getRaster().getDataBuffer()).getData();
int newPixels[] = ((DataBufferInt)scaledImageB.getRaster().getDataBuffer()).getData();
for (int row = 0; row < newHeight; ++row) {
for (int column = 0; column < newWidth; ++column) {
int oldRow = Math.min(origH-1,
(int)((float)(row)*
heightScale + .5f));
int oldColumn =
Math.min(origW-1,
(int)((float)column*widthScale + .5f));
newPixels[row*newWidth + column] =
origPixels[oldRow*origW + oldColumn];
}
}
}
else {
// If regular Image, then the work is done for us
scaledImage = origImage.getScaledInstance(newWidth,
newHeight,
Image.SCALE_DEFAULT);
}
return scaledImage;
}
}
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