/*
* $RCSfile: MlibRescaleOpImage.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:56:03 $
* $State: Exp $
*/
package com.lightcrafts.media.jai.mlib;
import java.awt.Rectangle;
import java.awt.image.DataBuffer;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.WritableRaster;
import com.lightcrafts.mediax.jai.ImageLayout;
import com.lightcrafts.mediax.jai.PointOpImage;
import java.util.Map;
import com.sun.medialib.mlib.*;
// import com.lightcrafts.media.jai.test.OpImageTester;
/**
* An OpImage class that multiplies pixels in an
* image by a constant, then adds an offset.
*
*/
final class MlibRescaleOpImage extends PointOpImage {
private double[] constants;
private double[] offsets;
// XXX This cloning of the ImageLayout object should be centraliZed
// into the superclass PointOpImage and removed from the mlib subclasses.
private static ImageLayout layoutHelper(ImageLayout layout) {
if (layout == null) {
return null;
} else {
return (ImageLayout)layout.clone();
}
}
/**
* Constructs an MlibRescaleOpImage. The image dimensions are copied
* from the source image. The tile grid layout, SampleModel, and
* ColorModel may optionally be specified by an ImageLayout object.
*
* @param source a RenderedImage.
* @param layout an ImageLayout optionally containing the tile
* grid layout, SampleModel, and ColorModel, or null.
*/
public MlibRescaleOpImage(RenderedImage source,
Map config,
ImageLayout layout,
double[] constants,
double[] offsets) {
super(source, layoutHelper(layout), config, true);
int numBands = getSampleModel().getNumBands();
this.constants = MlibUtils.initConstants(constants, numBands);
this.offsets = MlibUtils.initConstants(offsets, numBands);
// Set flag to permit in-place operation.
permitInPlaceOperation();
}
/**
* Multiply the pixel values of a rectangle with a given constant,
* then add an offset. The sources are cobbled.
*
* @param sources an array of sources, guarantee to provide all
* necessary source data for computing the rectangle.
* @param dest a tile that contains the rectangle to be computed.
* @param destRect the rectangle within this OpImage to be processed.
*/
protected void computeRect(Raster[] sources,
WritableRaster dest,
Rectangle destRect) {
Raster source = sources[0];
Rectangle srcRect = mapDestRect(destRect, 0);
int formatTag = MediaLibAccessor.findCompatibleTag(sources,dest);
MediaLibAccessor srcAccessor =
new MediaLibAccessor(source,srcRect,formatTag);
MediaLibAccessor dstAccessor =
new MediaLibAccessor(dest,destRect,formatTag);
mediaLibImage[] srcML = srcAccessor.getMediaLibImages();
mediaLibImage[] dstML = dstAccessor.getMediaLibImages();
switch (dstAccessor.getDataType()) {
case DataBuffer.TYPE_BYTE:
case DataBuffer.TYPE_USHORT:
case DataBuffer.TYPE_SHORT:
case DataBuffer.TYPE_INT:
for (int i = 0; i < dstML.length; i++) {
double[] mlconstants = dstAccessor.getDoubleParameters(i, constants);
double[] mloffsets = dstAccessor.getDoubleParameters(i, offsets);
Image.Scale2(dstML[i], srcML[i], mlconstants, mloffsets);
}
break;
case DataBuffer.TYPE_FLOAT:
case DataBuffer.TYPE_DOUBLE:
for (int i = 0; i < dstML.length; i++) {
double[] mlconstants = dstAccessor.getDoubleParameters(i, constants);
double[] mloffsets = dstAccessor.getDoubleParameters(i, offsets);
Image.Scale_Fp(dstML[i], srcML[i], mlconstants, mloffsets);
}
break;
default:
String className = this.getClass().getName();
throw new RuntimeException(className + JaiI18N.getString("Generic2"));
}
if (dstAccessor.isDataCopy()) {
dstAccessor.clampDataArrays();
dstAccessor.copyDataToRaster();
}
}
// public static OpImage createTestImage(OpImageTester oit) {
// double[] consts = { 5.0D, 5.0D, 5.0D };
// double[] offsets = { 0.0D, 0.0D, 0.0D };
// return new MlibRescaleOpImage(oit.getSource(), null,
// new ImageLayout(oit.getSource()),
// consts,
// offsets);
// }
// // Calls a method on OpImage that uses introspection, to make this
// // class, discover it's createTestImage() call, call it and then
// // benchmark the performance of the created OpImage chain.
// public static void main (String args[]) {
// String classname = "com.lightcrafts.media.jai.mlib.MlibRescaleOpImage";
// OpImageTester.performDiagnostics(classname,args);
// }
}