/*
* $RCSfile: ColorConvertOpImage.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.4 $
* $Date: 2006/06/16 20:25:49 $
* $State: Exp $
*/
package com.sun.media.jai.opimage;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.image.ColorConvertOp;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.SampleModel;
import java.awt.image.WritableRaster;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import javax.media.jai.ColorSpaceJAI;
import javax.media.jai.IHSColorSpace;
import javax.media.jai.ImageLayout;
import javax.media.jai.PointOpImage;
import javax.media.jai.RasterFactory;
import java.lang.ref.SoftReference;
/**
* An <code>OpImage</code> implementing the "ColorConvert" operation as
* described in <code>javax.media.jai.operator.ColorConvertDescriptor</code>.
*
* @since EA4
*
* @see javax.media.jai.PointOpImage
* @see javax.media.jai.operator.ColorConvertDescriptor
*
*/
final class ColorConvertOpImage extends PointOpImage {
/** Cache a rgb color space */
private static final ColorSpace rgbColorSpace
= ColorSpace.getInstance(ColorSpace.CS_sRGB);
private static SoftReference softRef = null;
/** The source image parameters */
private ImageParameters srcParam = null;
/** The source image parameters */
private ImageParameters dstParam = null;
/** The intermediate image parameters */
private ImageParameters tempParam = null;
/** The Java 2D ColorConvertOp instance for converting integer type */
private ColorConvertOp colorConvertOp = null;
/** case number */
private int caseNumber;
/**
* Retrive/cache the ColorConvertOp. Because instantiate a ColorConvertOp
* is a time-consuming step, create a hashtable referred to by a
* SoftReference to cache the ColorConvertOp for using repeatedly.
*
* @param src the color space of the source image
* dst the color space of the destination image
* @return The ColorConvertOp to convert from the source color space to
* the destination color space.
*/
private static synchronized ColorConvertOp
getColorConvertOp(ColorSpace src, ColorSpace dst) {
HashMap colorConvertOpBuf =null;
if (softRef == null ||
((colorConvertOpBuf = (HashMap)softRef.get()) == null)) {
colorConvertOpBuf = new HashMap();
softRef = new SoftReference(colorConvertOpBuf);
}
ArrayList hashcode = new ArrayList(2);
hashcode.add(0, src);
hashcode.add(1, dst);
ColorConvertOp op = (ColorConvertOp)colorConvertOpBuf.get(hashcode);
if (op == null) {
op = new ColorConvertOp(src, dst, null);
colorConvertOpBuf.put(hashcode, op);
}
return op;
}
/**
* Retrieve the minimum value of a data type.
*
* @param dataType The data type as in DataBuffer.TYPE_*.
* @return The minimum value of the specified data type.
*/
private static float getMinValue(int dataType) {
float minValue = 0;
switch (dataType) {
case DataBuffer.TYPE_BYTE:
minValue = 0;
break;
case DataBuffer.TYPE_SHORT:
minValue = Short.MIN_VALUE;
break;
case DataBuffer.TYPE_USHORT:
minValue = 0;
break;
case DataBuffer.TYPE_INT:
minValue = Integer.MIN_VALUE;
break;
default:
minValue = 0;
}
return minValue;
}
/**
* Retrieve the range of a data type.
*
* @param dataType The data type as in DataBuffer.TYPE_*.
* @return The range of the specified data type.
*/
private static float getRange(int dataType) {
float range = 1;
switch (dataType) {
case DataBuffer.TYPE_BYTE:
range = 255;
break;
case DataBuffer.TYPE_SHORT:
range = Short.MAX_VALUE - (int) Short.MIN_VALUE;
break;
case DataBuffer.TYPE_USHORT:
range = Short.MAX_VALUE - (int)Short.MIN_VALUE;
break;
case DataBuffer.TYPE_INT:
range = Integer.MAX_VALUE - (long) Integer.MIN_VALUE;
break;
default:
range = 1;
}
return range;
}
/**
* Constructor.
*
* @param source The source image.
* @param config Configurable attributes of the image including
* configuration variables indexed by
* <code>RenderingHints.Key</code>s and image properties indexed
* by <code>String</code>s or <code>CaselessStringKey</code>s.
* This is simply forwarded to the superclass constructor.
* @param layout The destination image layout.
* @param colorModel The destination color model.
*/
public ColorConvertOpImage(RenderedImage source,
Map config,
ImageLayout layout,
ColorModel colorModel) {
super(source, layout, config, true);
this.colorModel = colorModel;
// Cache the ColorModels.
srcParam = new ImageParameters(source.getColorModel(),
source.getSampleModel());
dstParam = new ImageParameters(colorModel, sampleModel);
ColorSpace srcColorSpace = srcParam.getColorModel().getColorSpace();
ColorSpace dstColorSpace = dstParam.getColorModel().getColorSpace();
// for each case, define the case number; create tempParam
// and/or ColorConvertOp if necessary
if (srcColorSpace instanceof ColorSpaceJAI &&
dstColorSpace instanceof ColorSpaceJAI) {
// when both are ColorSpaceJAI, convert via RGB
caseNumber = 1;
tempParam = createTempParam();
} else if (srcColorSpace instanceof ColorSpaceJAI) {
// when source is ColorSpaceJAI, 1. convert via RGB if
// the dest isn't RGB; 2. convert to RGB
if (dstColorSpace != rgbColorSpace) {
caseNumber = 2;
tempParam = createTempParam();
colorConvertOp = getColorConvertOp(rgbColorSpace,
dstColorSpace);
}
else caseNumber = 3;
} else if (dstColorSpace instanceof ColorSpaceJAI) {
// when destination is ColorSpaceJAI, 1. convert via RGB if
// source isn't RGB; 2. convert from RGB
if (srcColorSpace != rgbColorSpace) {
caseNumber = 4;
tempParam = createTempParam();
colorConvertOp = getColorConvertOp(srcColorSpace,
rgbColorSpace);
} else caseNumber = 5;
} else {
// if all the color space are not ColorSpaceJAI
caseNumber = 6;
colorConvertOp = getColorConvertOp(srcColorSpace, dstColorSpace);
}
// Set flag to permit in-place operation.
permitInPlaceOperation();
}
/**
* Computes a tile of the destination image in the destination color space.
*
* @param sources Cobbled sources, guaranteed to provide all the
* source data necessary for computing the rectangle.
* @param dest The tile containing the rectangle to be computed.
* @param destRect The rectangle within the tile to be computed.
*/
protected void computeRect(Raster[] sources,
WritableRaster dest,
Rectangle destRect) {
WritableRaster tempRas = null;
// Save a reference to the source Raster.
Raster source = sources[0];
// Ensure the source Raster has the same bounds as the destination.
if(!destRect.equals(source.getBounds())) {
source = source.createChild(destRect.x, destRect.y,
destRect.width, destRect.height,
destRect.x, destRect.y,
null);
}
switch (caseNumber) {
// 1. When source and destination color spaces are all ColorSpaceJAI,
// convert via RGB color space
case 1:
tempRas = computeRectColorSpaceJAIToRGB(source, srcParam,
null, tempParam);
computeRectColorSpaceJAIFromRGB(tempRas, tempParam,
dest, dstParam);
break;
// when only the source color space is ColorSpaceJAI,
// 2. if the destination is not RGB, convert to RGB using
// ColorSpaceJAI; then convert RGB to the destination
// 3. if the destination is RGB, convert using ColorSpaceJAI
case 2:
tempRas = computeRectColorSpaceJAIToRGB(source, srcParam,
null, tempParam);
computeRectNonColorSpaceJAI(tempRas, tempParam,
dest, dstParam, destRect);
break;
case 3:
computeRectColorSpaceJAIToRGB(source, srcParam,
dest, dstParam);
break;
// 4, 5. When only the destination color space is ColorSpaceJAI,
// similar to the case above.
case 4:
tempRas =createTempWritableRaster(source);
computeRectNonColorSpaceJAI(source, srcParam,
tempRas, tempParam, destRect);
computeRectColorSpaceJAIFromRGB(tempRas, tempParam,
dest, dstParam);
break;
case 5:
computeRectColorSpaceJAIFromRGB(source, srcParam,
dest, dstParam);
break;
// 6. If all the color space are not ColorSpaceJAI
case 6:
computeRectNonColorSpaceJAI(source, srcParam,
dest, dstParam, destRect);
default :
break;
}
}
// when the source color space is ColorSpaceJAI, convert it to RGB.
// 1. If the source data type is short/int, shift the data to [0,
// MAX-MIN]
// 2. Convert to RGB.
// 3. Shift back to [MIN, MAX]
private WritableRaster computeRectColorSpaceJAIToRGB(Raster src,
ImageParameters srcParam,
WritableRaster dest,
ImageParameters dstParam) {
src = convertRasterToUnsigned(src);
ColorSpaceJAI colorSpaceJAI
= (ColorSpaceJAI) srcParam.getColorModel().getColorSpace();
dest = colorSpaceJAI.toRGB(src, srcParam.getComponentSize(), dest,
dstParam.getComponentSize());
dest = convertRasterToSigned(dest);
return dest;
}
// when the source color space is ColorSpaceJAI, convert it from RGB.
// 1. If the source data type is short/int, shift the data to [0,
// MAX-MIN]
// 2. Convert from RGB.
// 3. Shift back to [MIN, MAX]
private WritableRaster computeRectColorSpaceJAIFromRGB(Raster src,
ImageParameters srcParam,
WritableRaster dest,
ImageParameters dstParam){
src = convertRasterToUnsigned(src);
ColorSpaceJAI colorSpaceJAI
= (ColorSpaceJAI) dstParam.getColorModel().getColorSpace();
dest = colorSpaceJAI.fromRGB(src, srcParam.getComponentSize(), dest,
dstParam.getComponentSize());
dest = convertRasterToSigned(dest);
return dest;
}
// When the source and destination color spaces are not ColorSpaceJAI,
// convert using ColorConvertOp of Java 2D for integer type. For the
// floating point, use the following method.
private void computeRectNonColorSpaceJAI(Raster src,
ImageParameters srcParam,
WritableRaster dest,
ImageParameters dstParam,
Rectangle destRect) {
if (!srcParam.isFloat() && !dstParam.isFloat()) {
// Create a ColorConvertOp if there are only integral data.
// Integral type: use the ColorConvertOp.
// Ensure that the Rasters are the same size as apparently
// required by ColorConvertOp although not so documented.
Raster s = src;
if (s.getMinX() != destRect.x ||
s.getMinY() != destRect.y ||
s.getWidth() != destRect.width ||
s.getHeight() != destRect.height) {
s = s.createChild(destRect.x, destRect.y,
destRect.width, destRect.height,
destRect.x, destRect.y, null);
}
WritableRaster d = dest;
if (d.getMinX() != destRect.x ||
d.getMinY() != destRect.y ||
d.getWidth() != destRect.width ||
d.getHeight() != destRect.height) {
d = d.createWritableChild(destRect.x, destRect.y,
destRect.width, destRect.height,
destRect.x, destRect.y, null);
}
// Perform the color conversion on the (possible child) Rasters.
synchronized (colorConvertOp.getClass()) {
// Lock on the class to prevent crash in non-re-entrant
// native code on MP systems (jai-core issue 21).
colorConvertOp.filter(s, d);
}
} else {
//For the floating point data types, convert via CIEXYZ color space.
//Do it pixel-by-pixel (slow!).
ColorSpace srcColorSpace = srcParam.getColorModel().getColorSpace();
ColorSpace dstColorSpace = dstParam.getColorModel().getColorSpace();
boolean srcFloat = srcParam.isFloat();
float srcMinValue = srcParam.getMinValue();
float srcRange = srcParam.getRange();
boolean dstFloat = dstParam.isFloat();
float dstMinValue = dstParam.getMinValue();
float dstRange = dstParam.getRange();
int rectYMax = destRect.y + destRect.height;
int rectXMax = destRect.x + destRect.width;
int numComponents = srcColorSpace.getNumComponents();
float[] srcPixel = new float[numComponents];
float[] xyzPixel;
float[] dstPixel;
for (int y = destRect.y; y < rectYMax; y++) {
for (int x = destRect.x; x < rectXMax; x++) {
srcPixel = src.getPixel(x, y, srcPixel);
if (!srcFloat) {
// Normalize the source samples.
for (int i = 0; i < numComponents; i++) {
srcPixel[i] = (srcPixel[i] - srcMinValue)/srcRange;
}
}
// Convert src to dst via CIEXYZ.
xyzPixel = srcColorSpace.toCIEXYZ(srcPixel);
dstPixel = dstColorSpace.fromCIEXYZ(xyzPixel);
if (!dstFloat) {
// Scale the destination samples.
for (int i = 0; i < numComponents; i++) {
dstPixel[i] = (dstPixel[i]*dstRange + dstMinValue);
}
}
dest.setPixel(x, y, dstPixel);
}
}
}
}
// Back up the destination parameters. Set the destination to the
// bridge color space RGB.
private ImageParameters createTempParam() {
ColorModel cm = null;
SampleModel sm = null;
if (srcParam.getDataType() > dstParam.getDataType()) {
cm = srcParam.getColorModel();
sm = srcParam.getSampleModel();
} else {
cm = dstParam.getColorModel();
sm = dstParam.getSampleModel();
}
cm = new ComponentColorModel(rgbColorSpace,
cm.getComponentSize(),
cm.hasAlpha() ,
cm.isAlphaPremultiplied(),
cm.getTransparency(),
sm.getDataType());
return new ImageParameters(cm, sm);
}
// Create an WritableRaster with the same SampleModel and location
// as the passed Raster parameter.
private WritableRaster createTempWritableRaster(Raster src) {
Point origin = new Point(src.getMinX(), src.getMinY());
return RasterFactory.createWritableRaster(src.getSampleModel(),
origin);
}
// Shift the sample value to [0, MAX-MIN]
private Raster convertRasterToUnsigned(Raster ras) {
int type = ras.getSampleModel().getDataType();
WritableRaster tempRas = null;
if ((type == DataBuffer.TYPE_INT
|| type == DataBuffer.TYPE_SHORT)) {
int minX = ras.getMinX(), minY = ras.getMinY();
int w = ras.getWidth() , h = ras.getHeight();
int[] buf = ras.getPixels(minX, minY, w, h, (int[])null);
convertBufferToUnsigned(buf, type);
tempRas = createTempWritableRaster(ras);
tempRas.setPixels(minX, minY, w, h, buf);
return tempRas;
}
return ras;
}
// Shift the sample value back to [MIN, MAX]
private WritableRaster convertRasterToSigned(WritableRaster ras) {
int type = ras.getSampleModel().getDataType();
WritableRaster tempRas = null;
if ((type == DataBuffer.TYPE_INT
|| type == DataBuffer.TYPE_SHORT)) {
int minX = ras.getMinX(), minY = ras.getMinY();
int w = ras.getWidth() , h = ras.getHeight();
int[] buf = ras.getPixels(minX, minY, w, h, (int[])null);
convertBufferToSigned(buf, type);
if (ras instanceof WritableRaster)
tempRas = (WritableRaster) ras;
else
tempRas = createTempWritableRaster(ras);
tempRas.setPixels(minX, minY, w, h, buf);
return tempRas;
}
return ras;
}
// Shift the value to [MIN, MAX]
private void convertBufferToSigned(int[] buf, int type) {
if (buf == null) return;
if (type == DataBuffer.TYPE_SHORT)
for (int i=0; i < buf.length; i++) {
buf[i] += Short.MIN_VALUE;
}
else if (type == DataBuffer.TYPE_INT) {
for (int i=0; i < buf.length; i++) {
buf[i] = (int) ((buf[i] & 0xFFFFFFFFl) + Integer.MIN_VALUE);
}
}
}
// Shift the value to [0, MAX-MIN]
private void convertBufferToUnsigned(int[] buf, int type) {
if (buf == null) return;
if (type == DataBuffer.TYPE_SHORT)
for (int i = 0; i < buf.length; i++) {
buf[i] -= Short.MIN_VALUE;
}
else if (type == DataBuffer.TYPE_INT) {
for (int i = 0; i < buf.length; i++) {
buf[i] = (int) ((buf[i] & 0xFFFFFFFFl) - Integer.MIN_VALUE);
}
}
}
// define a class to cache the parameters
private final class ImageParameters {
private boolean isFloat;
private ColorModel colorModel;
private SampleModel sampleModel;
private float minValue;
private float range;
private int[] componentSize;
private int dataType;
ImageParameters(ColorModel cm, SampleModel sm) {
this.colorModel = cm;
this.sampleModel = sm;
this.dataType = sm.getDataType();
this.isFloat = this.dataType == DataBuffer.TYPE_FLOAT
|| this.dataType == DataBuffer.TYPE_DOUBLE;
this.minValue = ColorConvertOpImage.getMinValue(this.dataType);
this.range = ColorConvertOpImage.getRange(this.dataType);
this.componentSize = cm.getComponentSize();
}
public boolean isFloat() {
return isFloat;
}
public ColorModel getColorModel() {
return colorModel;
}
public SampleModel getSampleModel() {
return sampleModel;
}
public float getMinValue() {
return minValue;
}
public float getRange() {
return range;
}
public int[] getComponentSize() {
return componentSize;
}
public int getDataType() {
return dataType;
}
}
}