/java/awt/image/BandedSampleModel.java
/*
* @(#)BandedSampleModel.java 1.27 00/02/02
*
* Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/
/* ****************************************************************
******************************************************************
******************************************************************
*** COPYRIGHT (c) Eastman Kodak Company, 1997
*** As an unpublished work pursuant to Title 17 of the United
*** States Code. All rights reserved.
******************************************************************
******************************************************************
******************************************************************/
package java.awt.image;
/**
* This class represents image data which is stored in a band interleaved
* fashion and for
* which each sample of a pixel occupies one data element of the DataBuffer.
* It subclasses ComponentSampleModel but provides a more efficent
* implementation for accessing band interleaved image data than is provided
* by ComponentSampleModel. This class should typically be used when working
* with images which store sample data for each band in a different bank of the
* DataBuffer. Accessor methods are provided so that image data can be
* manipulated directly. Pixel stride is the number of
* data array elements between two samples for the same band on the same
* scanline. The pixel stride for a BandedSampleModel is one.
* Scanline stride is the number of data array elements between
* a given sample and the corresponding sample in the same column of the next
* scanline. Band offsets denote the number
* of data array elements from the first data array element of the bank
* of the DataBuffer holding each band to the first sample of the band.
* The bands are numbered from 0 to N-1.
* Bank indices denote the correspondence between a bank of the data buffer
* and a band of image data. This class supports
* {@link DataBuffer#TYPE_BYTE TYPE_BYTE},
* {@link DataBuffer#TYPE_USHORT TYPE_USHORT},
* {@link DataBuffer#TYPE_SHORT TYPE_SHORT},
* {@link DataBuffer#TYPE_INT TYPE_INT} datatypes
*/
public final class BandedSampleModel extends ComponentSampleModel
{
/**
* Constructs a BandedSampleModel with the specified parameters.
* The pixel stride will be one data element. The scanline stride
* will be the same as the width. Each band will be stored in
* a separate bank and all band offsets will be zero.
* @param dataType The data type for storing samples.
* @param w The width (in pixels) of the region of
* image data described.
* @param h The height (in pixels) of the region of image
* data described.
* @param numBands The number of bands for the image data.
* @throws IllegalArgumentException if <code>dataType</code> is not
* one of the supported data types
*/
public BandedSampleModel(int dataType, int w, int h, int numBands) {
super(dataType, w, h, 1, w,
BandedSampleModel.createIndiciesArray(numBands),
BandedSampleModel.createOffsetArray(numBands));
}
/**
* Constructs a BandedSampleModel with the specified parameters.
* The number of bands will be inferred from the lengths of the
* bandOffsets bankIndices arrays, which must be equal. The pixel
* stride will be one data element.
* @param dataType The data type for storing samples.
* @param w The width (in pixels) of the region of
* image data described.
* @param h The height (in pixels) of the region of
* image data described.
* @param numBands The number of bands for the image data.
* @param scanlineStride The line stride of the of the image data.
* @param bankIndices The bank index for each band.
* @param bandOffsets The band offset for each band.
* @throws IllegalArgumentException if <code>dataType</code> is not
* one of the supported data types
*/
public BandedSampleModel(int dataType,
int w, int h,
int scanlineStride,
int bankIndices[],
int bandOffsets[]) {
super(dataType, w, h, 1,scanlineStride, bankIndices, bandOffsets);
}
/**
* Creates a new BandedSampleModel with the specified
* width and height. The new BandedSampleModel will have the same
* number of bands, storage data type, and bank indices
* as this BandedSampleModel. The band offsets will be compressed
* such that the offset between bands will be w*pixelStride and
* the minimum of all of the band offsets is zero.
* @param w the width of the resulting <code>BandedSampleModel</code>
* @param h the height of the resulting <code>BandedSampleModel</code>
* @return a new <code>BandedSampleModel</code> with the specified
* width and height.
* @throws IllegalArgumentException if <code>w</code> or
* <code>h</code> equals either
* <code>Integer.MAX_VALUE</code> or
* <code>Integer.MIN_VALUE</code>
* @throws IllegalArgumentException if <code>dataType</code> is not
* one of the supported data types
*/
public SampleModel createCompatibleSampleModel(int w, int h) {
int[] bandOffs;
if (numBanks == 1) {
bandOffs = orderBands(bandOffsets, w*h);
}
else {
bandOffs = new int[bandOffsets.length];
}
SampleModel sampleModel =
new BandedSampleModel(dataType, w, h, w, bankIndices, bandOffs);
return sampleModel;
}
/**
* Creates a new BandedSampleModel with a subset of the bands of this
* BandedSampleModel. The new BandedSampleModel can be
* used with any DataBuffer that the existing BandedSampleModel
* can be used with. The new BandedSampleModel/DataBuffer
* combination will represent an image with a subset of the bands
* of the original BandedSampleModel/DataBuffer combination.
* @throws RasterFormatException if the number of bands is greater than
* the number of banks in this sample model.
* @throws IllegalArgumentException if <code>dataType</code> is not
* one of the supported data types
*/
public SampleModel createSubsetSampleModel(int bands[]) {
if (bands.length > bankIndices.length)
throw new RasterFormatException("There are only " +
bankIndices.length +
" bands");
int newBankIndices[] = new int[bands.length];
int newBandOffsets[] = new int[bands.length];
for (int i=0; i<bands.length; i++) {
newBankIndices[i] = bankIndices[bands[i]];
newBandOffsets[i] = bandOffsets[bands[i]];
}
return new BandedSampleModel(this.dataType, width, height,
this.scanlineStride,
newBankIndices, newBandOffsets);
}
/**
* Creates a DataBuffer that corresponds to this BandedSampleModel,
* The DataBuffer's data type, number of banks, and size
* will be consistent with this BandedSampleModel.
* @throws IllegalArgumentException if <code>dataType</code> is not
* either <code>DataBuffer.TYPE_BYTE</code>,
* <code>DataBuffer.TYPE_USHORT</code>, or
* <code>DataBuffer.TYPE_SHORT</code>, or
* <code>DataBuffer.TYPE_INT</code>
*/
public DataBuffer createDataBuffer() {
DataBuffer dataBuffer = null;
int size = scanlineStride * height;
switch (dataType) {
case DataBuffer.TYPE_BYTE:
dataBuffer = new DataBufferByte(size, numBands);
break;
case DataBuffer.TYPE_USHORT:
dataBuffer = new DataBufferUShort(size, numBands);
break;
case DataBuffer.TYPE_SHORT:
dataBuffer = new DataBufferShort(size, numBands);
break;
case DataBuffer.TYPE_INT:
dataBuffer = new DataBufferInt(size, numBands);
break;
}
return dataBuffer;
}
/**
* Returns data for a single pixel in a primitive array of type
* TransferType. For a BandedSampleModel, this will be the same
* as the data type, and samples will be returned one per array
* element. Generally, obj
* should be passed in as null, so that the Object will be created
* automatically and will be of the right primitive data type.
* <p>
* The following code illustrates transferring data for one pixel from
* DataBuffer <code>db1</code>, whose storage layout is described by
* BandedSampleModel <code>bsm1</code>, to DataBuffer <code>db2</code>,
* whose storage layout is described by
* BandedSampleModel <code>bsm2</code>.
* The transfer will generally be more efficient than using
* getPixel/setPixel.
* <pre>
* BandedSampleModel bsm1, bsm2;
* DataBufferInt db1, db2;
* bsm2.setDataElements(x, y, bsm1.getDataElements(x, y, null, db1),
* db2);
* </pre>
* Using getDataElements/setDataElements to transfer between two
* DataBuffer/SampleModel pairs is legitimate if the SampleModels have
* the same number of bands, corresponding bands have the same number of
* bits per sample, and the TransferTypes are the same.
* <p>
* If obj is non-null, it should be a primitive array of type TransferType.
* Otherwise, a ClassCastException is thrown. An
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds, or if obj is non-null and is not large enough to hold
* the pixel data.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param obj If non-null, a primitive array in which to return
* the pixel data.
* @param data The DataBuffer containing the image data.
*/
public Object getDataElements(int x, int y, Object obj, DataBuffer data) {
int type = getTransferType();
int numDataElems = getNumDataElements();
int pixelOffset = y*scanlineStride + x;
switch(type) {
case DataBuffer.TYPE_BYTE:
byte[] bdata;
if (obj == null) {
bdata = new byte[numDataElems];
} else {
bdata = (byte[])obj;
}
for (int i=0; i<numDataElems; i++) {
bdata[i] = (byte)data.getElem(bankIndices[i],
pixelOffset + bandOffsets[i]);
}
obj = (Object)bdata;
break;
case DataBuffer.TYPE_USHORT:
case DataBuffer.TYPE_SHORT:
short[] sdata;
if (obj == null) {
sdata = new short[numDataElems];
} else {
sdata = (short[])obj;
}
for (int i=0; i<numDataElems; i++) {
sdata[i] = (short)data.getElem(bankIndices[i],
pixelOffset + bandOffsets[i]);
}
obj = (Object)sdata;
break;
case DataBuffer.TYPE_INT:
int[] idata;
if (obj == null) {
idata = new int[numDataElems];
} else {
idata = (int[])obj;
}
for (int i=0; i<numDataElems; i++) {
idata[i] = data.getElem(bankIndices[i],
pixelOffset + bandOffsets[i]);
}
obj = (Object)idata;
break;
}
return obj;
}
/**
* Returns all samples for the specified pixel in an int array.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param iArray If non-null, returns the samples in this array.
* @param data The DataBuffer containing the image data.
*/
public int[] getPixel(int x, int y, int iArray[], DataBuffer data) {
int[] pixels;
if (iArray != null) {
pixels = iArray;
} else {
pixels = new int [numBands];
}
int pixelOffset = y*scanlineStride + x;
for (int i=0; i<numBands; i++) {
pixels[i] = data.getElem(bankIndices[i],
pixelOffset + bandOffsets[i]);
}
return pixels;
}
/**
* Returns all samples for the specified rectangle of pixels in
* an int array, one sample per data array element.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param w The width of the pixel rectangle.
* @param h The height of the pixel rectangle.
* @param iArray If non-null, returns the samples in this array.
* @param data The DataBuffer containing the image data.
*/
public int[] getPixels(int x, int y, int w, int h,
int iArray[], DataBuffer data) {
int[] pixels;
if (iArray != null) {
pixels = iArray;
} else {
pixels = new int[w*h*numBands];
}
for (int k = 0; k < numBands; k++) {
int lineOffset = y*scanlineStride + x + bandOffsets[k];
int srcOffset = k;
int bank = bankIndices[k];
for (int i = 0; i < h; i++) {
int pixelOffset = lineOffset;
for (int j = 0; j < w; j++) {
pixels[srcOffset] = data.getElem(bank, pixelOffset++);
srcOffset += numBands;
}
lineOffset += scanlineStride;
}
}
return pixels;
}
/**
* Returns as int the sample in a specified band for the pixel
* located at (x,y).
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param b The band to return.
* @param data The DataBuffer containing the image data.
*/
public int getSample(int x, int y, int b, DataBuffer data) {
int sample =
data.getElem(bankIndices[b],
y*scanlineStride + x + bandOffsets[b]);
return sample;
}
/**
* Returns the sample in a specified band
* for the pixel located at (x,y) as a float.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param b The band to return.
* @param data The DataBuffer containing the image data.
*/
public float getSampleFloat(int x, int y, int b, DataBuffer data) {
float sample = data.getElemFloat(bankIndices[b],
y*scanlineStride + x + bandOffsets[b]);
return sample;
}
/**
* Returns the sample in a specified band
* for a pixel located at (x,y) as a double.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param b The band to return.
* @param data The DataBuffer containing the image data.
*/
public double getSampleDouble(int x, int y, int b, DataBuffer data) {
double sample = data.getElemDouble(bankIndices[b],
y*scanlineStride + x + bandOffsets[b]);
return sample;
}
/**
* Returns the samples in a specified band for the specified rectangle
* of pixels in an int array, one sample per data array element.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param w The width of the pixel rectangle.
* @param h The height of the pixel rectangle.
* @param b The band to return.
* @param iArray If non-null, returns the samples in this array.
* @param data The DataBuffer containing the image data.
*/
public int[] getSamples(int x, int y, int w, int h, int b,
int iArray[], DataBuffer data) {
int samples[];
if (iArray != null) {
samples = iArray;
} else {
samples = new int [w*h];
}
int lineOffset = y*scanlineStride + x + bandOffsets[b];
int srcOffset = 0;
int bank = bankIndices[b];
for (int i = 0; i < h; i++) {
int sampleOffset = lineOffset;
for (int j = 0; j < w; j++) {
samples[srcOffset++] = data.getElem(bank, sampleOffset++);
}
lineOffset += scanlineStride;
}
return samples;
}
/**
* Sets the data for a single pixel in the specified DataBuffer from a
* primitive array of type TransferType. For a BandedSampleModel,
* this will be the same as the data type, and samples are transferred
* one per array element.
* <p>
* The following code illustrates transferring data for one pixel from
* DataBuffer <code>db1</code>, whose storage layout is described by
* BandedSampleModel <code>bsm1</code>, to DataBuffer <code>db2</code>,
* whose storage layout is described by
* BandedSampleModel <code>bsm2</code>.
* The transfer will generally be more efficient than using
* getPixel/setPixel.
* <pre>
* BandedSampleModel bsm1, bsm2;
* DataBufferInt db1, db2;
* bsm2.setDataElements(x, y, bsm1.getDataElements(x, y, null, db1),
* db2);
* </pre>
* Using getDataElements/setDataElements to transfer between two
* DataBuffer/SampleModel pairs is legitimate if the SampleModels have
* the same number of bands, corresponding bands have the same number of
* bits per sample, and the TransferTypes are the same.
* <p>
* obj must be a primitive array of type TransferType. Otherwise,
* a ClassCastException is thrown. An
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds, or if obj is not large enough to hold the pixel data.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param obj If non-null, returns the primitive array in this object.
* @param data The DataBuffer containing the image data.
*/
public void setDataElements(int x, int y, Object obj, DataBuffer data) {
int type = getTransferType();
int numDataElems = getNumDataElements();
int pixelOffset = y*scanlineStride + x;
switch(type) {
case DataBuffer.TYPE_BYTE:
byte[] barray = (byte[])obj;
for (int i=0; i<numDataElems; i++) {
data.setElem(bankIndices[i], pixelOffset + bandOffsets[i],
((int)barray[i])∧0xff);
}
break;
case DataBuffer.TYPE_USHORT:
case DataBuffer.TYPE_SHORT:
short[] sarray = (short[])obj;
for (int i=0; i<numDataElems; i++) {
data.setElem(bankIndices[i], pixelOffset + bandOffsets[i],
((int)sarray[i])∧0xffff);
}
break;
case DataBuffer.TYPE_INT:
int[] iarray = (int[])obj;
for (int i=0; i<numDataElems; i++) {
data.setElem(bankIndices[i], pixelOffset + bandOffsets[i],
iarray[i]);
}
break;
}
}
/**
* Sets a pixel in the DataBuffer using an int array of samples for input.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param iArray The input samples in an int array.
* @param data The DataBuffer containing the image data.
*/
public void setPixel(int x, int y, int iArray[], DataBuffer data) {
int pixelOffset = y*scanlineStride + x;
for (int i=0; i<numBands; i++) {
data.setElem(bankIndices[i], pixelOffset + bandOffsets[i],
iArray[i]);
}
}
/**
* Sets all samples for a rectangle of pixels from an int array containing
* one sample per array element.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param w The width of the pixel rectangle.
* @param h The height of the pixel rectangle.
* @param iArray The input samples in an int array.
* @param data The DataBuffer containing the image data.
*/
public void setPixels(int x, int y, int w, int h,
int iArray[], DataBuffer data) {
for (int k = 0; k < numBands; k++) {
int lineOffset = y*scanlineStride + x + bandOffsets[k];
int srcOffset = k;
int bank = bankIndices[k];
for (int i = 0; i < h; i++) {
int pixelOffset = lineOffset;
for (int j = 0; j < w; j++) {
data.setElem(bank, pixelOffset++, iArray[srcOffset]);
srcOffset += numBands;
}
lineOffset += scanlineStride;
}
}
}
/**
* Sets a sample in the specified band for the pixel located at (x,y)
* in the DataBuffer using an int for input.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param b The band to set.
* @param s The input sample as an int.
* @param data The DataBuffer containing the image data.
*/
public void setSample(int x, int y, int b, int s,
DataBuffer data) {
data.setElem(bankIndices[b],
y*scanlineStride + x + bandOffsets[b], s);
}
/**
* Sets a sample in the specified band for the pixel located at (x,y)
* in the DataBuffer using a float for input.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param b The band to set.
* @param s The input sample as a float.
* @param data The DataBuffer containing the image data.
*/
public void setSample(int x, int y, int b,
float s ,
DataBuffer data) {
data.setElemFloat(bankIndices[b],
y*scanlineStride + x + bandOffsets[b], s);
}
/**
* Sets a sample in the specified band for the pixel located at (x,y)
* in the DataBuffer using a double for input.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param b The band to set.
* @param s The input sample as a double.
* @param data The DataBuffer containing the image data.
*/
public void setSample(int x, int y, int b,
double s,
DataBuffer data) {
data.setElemDouble(bankIndices[b],
y*scanlineStride + x + bandOffsets[b], s);
}
/**
* Sets the samples in the specified band for the specified rectangle
* of pixels from an int array containing one sample per data array element.
* ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param w The width of the pixel rectangle.
* @param h The height of the pixel rectangle.
* @param b The band to set.
* @param iArray The input sample array.
* @param data The DataBuffer containing the image data.
*/
public void setSamples(int x, int y, int w, int h, int b,
int iArray[], DataBuffer data) {
int lineOffset = y*scanlineStride + x + bandOffsets[b];
int srcOffset = 0;
int bank = bankIndices[b];
for (int i = 0; i < h; i++) {
int sampleOffset = lineOffset;
for (int j = 0; j < w; j++) {
data.setElem(bank, sampleOffset++, iArray[srcOffset++]);
}
lineOffset += scanlineStride;
}
}
static int[] createOffsetArray(int numBands) {
int[] bandOffsets = new int[numBands];
for (int i=0; i < numBands; i++) {
bandOffsets[i] = 0;
}
return bandOffsets;
}
static int[] createIndiciesArray(int numBands) {
int[] bankIndicies = new int[numBands];
for (int i=0; i < numBands; i++) {
bankIndicies[i] = i;
}
return bankIndicies;
}
}
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