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SinglePixelPackedSampleModel.java
/*
* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* ****************************************************************
******************************************************************
******************************************************************
*** 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*** As an unpublished work pursuant to Title 17 of the United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;
import java.util.Arrays;
/**
* This class represents pixel data packed such that the N samples which make
* up a single pixel are stored in a single data array element, and each data
* data array element holds samples for only one pixel.
* This class supports
* {@link DataBuffer#TYPE_BYTE TYPE_BYTE},
* {@link DataBuffer#TYPE_USHORT TYPE_USHORT},
* {@link DataBuffer#TYPE_INT TYPE_INT} data types.
* All data array elements reside
* in the first bank of a DataBuffer. Accessor methods are provided so
* that the image data can be manipulated directly. 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. Bit masks are the masks
* required to extract the samples representing the bands of the pixel.
* Bit offsets are the offsets in bits into the data array
* element of the samples representing the bands of the pixel.
* <p>
* The following code illustrates extracting the bits of the sample
* representing band {@code b} for pixel {@code x,y}
* from DataBuffer {@code data}:
* <pre>{@code
* int sample = data.getElem(y * scanlineStride + x);
* sample = (sample & bitMasks[b]) >>> bitOffsets[b];
* }</pre>
*/
public class SinglePixelPackedSampleModel extends SampleModel
{
/** Bit masks for all bands of the image data. */
private int[] bitMasks;
/** Bit Offsets for all bands of the image data. */
private int[] bitOffsets;
/** Bit sizes for all the bands of the image data. */
private int[] bitSizes;
/** Maximum bit size. */
private int maxBitSize;
/** Line stride of the region of image data described by this
* SinglePixelPackedSampleModel.
*/
private int scanlineStride;
private static native void initIDs();
static {
ColorModel.loadLibraries();
initIDs();
}
/**
* Constructs a SinglePixelPackedSampleModel with bitMasks.length bands.
* Each sample is stored in a data array element in the position of
* its corresponding bit mask. Each bit mask must be contiguous and
* masks must not overlap. Bit masks exceeding data type capacity are
* truncated.
* @param dataType The data type for storing samples.
* @param w The width (in pixels) of the region of the
* image data described.
* @param h The height (in pixels) of the region of the
* image data described.
* @param bitMasks The bit masks for all bands.
* @throws IllegalArgumentException if {@code dataType} is not
* either {@code DataBuffer.TYPE_BYTE},
* {@code DataBuffer.TYPE_USHORT}, or
* {@code DataBuffer.TYPE_INT}
*/
public SinglePixelPackedSampleModel(int dataType, int w, int h,
int[] bitMasks) {
this(dataType, w, h, w, bitMasks);
if (dataType != DataBuffer.TYPE_BYTE &&
dataType != DataBuffer.TYPE_USHORT &&
dataType != DataBuffer.TYPE_INT) {
throw new IllegalArgumentException("Unsupported data type "+
dataType);
}
}
/**
* Constructs a SinglePixelPackedSampleModel with bitMasks.length bands
* and a scanline stride equal to scanlineStride data array elements.
* Each sample is stored in a data array element in the position of
* its corresponding bit mask. Each bit mask must be contiguous and
* masks must not overlap. Bit masks exceeding data type capacity are
* truncated.
* @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 scanlineStride The line stride of the image data.
* @param bitMasks The bit masks for all bands.
* @throws IllegalArgumentException if {@code w} or
* {@code h} is not greater than 0
* @throws IllegalArgumentException if any mask in
* {@code bitMask} is not contiguous
* @throws IllegalArgumentException if {@code dataType} is not
* either {@code DataBuffer.TYPE_BYTE},
* {@code DataBuffer.TYPE_USHORT}, or
* {@code DataBuffer.TYPE_INT}
*/
public SinglePixelPackedSampleModel(int dataType, int w, int h,
int scanlineStride, int[] bitMasks) {
super(dataType, w, h, bitMasks.length);
if (dataType != DataBuffer.TYPE_BYTE &&
dataType != DataBuffer.TYPE_USHORT &&
dataType != DataBuffer.TYPE_INT) {
throw new IllegalArgumentException("Unsupported data type "+
dataType);
}
this.dataType = dataType;
this.bitMasks = bitMasks.clone();
this.scanlineStride = scanlineStride;
this.bitOffsets = new int[numBands];
this.bitSizes = new int[numBands];
int maxMask = (int)((1L << DataBuffer.getDataTypeSize(dataType)) - 1);
this.maxBitSize = 0;
for (int i=0; i<numBands; i++) {
int bitOffset = 0, bitSize = 0, mask;
this.bitMasks[i] &= maxMask;
mask = this.bitMasks[i];
if (mask != 0) {
while ((mask & 1) == 0) {
mask = mask >>> 1;
bitOffset++;
}
while ((mask & 1) == 1) {
mask = mask >>> 1;
bitSize++;
}
if (mask != 0) {
throw new IllegalArgumentException("Mask "+bitMasks[i]+
" must be contiguous");
}
}
bitOffsets[i] = bitOffset;
bitSizes[i] = bitSize;
if (bitSize > maxBitSize) {
maxBitSize = bitSize;
}
}
}
/**
* Returns the number of data elements needed to transfer one pixel
* via the getDataElements and setDataElements methods.
* For a SinglePixelPackedSampleModel, this is one.
*/
public int getNumDataElements() {
return 1;
}
/**
* Returns the size of the buffer (in data array elements)
* needed for a data buffer that matches this
* SinglePixelPackedSampleModel.
*/
private long getBufferSize() {
long size = scanlineStride * (height-1) + width;
return size;
}
/**
* Creates a new SinglePixelPackedSampleModel with the specified
* width and height. The new SinglePixelPackedSampleModel will have the
* same storage data type and bit masks as this
* SinglePixelPackedSampleModel.
* @param w the width of the resulting {@code SampleModel}
* @param h the height of the resulting {@code SampleModel}
* @return a {@code SinglePixelPackedSampleModel} with the
* specified width and height.
* @throws IllegalArgumentException if {@code w} or
* {@code h} is not greater than 0
*/
public SampleModel createCompatibleSampleModel(int w, int h) {
SampleModel sampleModel = new SinglePixelPackedSampleModel(dataType, w, h,
bitMasks);
return sampleModel;
}
/**
* Creates a DataBuffer that corresponds to this
* SinglePixelPackedSampleModel. The DataBuffer's data type and size
* will be consistent with this SinglePixelPackedSampleModel. The
* DataBuffer will have a single bank.
*/
public DataBuffer createDataBuffer() {
DataBuffer dataBuffer = null;
int size = (int)getBufferSize();
switch (dataType) {
case DataBuffer.TYPE_BYTE:
dataBuffer = new DataBufferByte(size);
break;
case DataBuffer.TYPE_USHORT:
dataBuffer = new DataBufferUShort(size);
break;
case DataBuffer.TYPE_INT:
dataBuffer = new DataBufferInt(size);
break;
}
return dataBuffer;
}
/** Returns the number of bits per sample for all bands. */
public int[] getSampleSize() {
return bitSizes.clone();
}
/** Returns the number of bits per sample for the specified band. */
public int getSampleSize(int band) {
return bitSizes[band];
}
/** Returns the offset (in data array elements) of pixel (x,y).
* The data element containing pixel {@code x,y}
* can be retrieved from a DataBuffer {@code data} with a
* SinglePixelPackedSampleModel {@code sppsm} as:
* <pre>
* data.getElem(sppsm.getOffset(x, y));
* </pre>
* @param x the X coordinate of the specified pixel
* @param y the Y coordinate of the specified pixel
* @return the offset of the specified pixel.
*/
public int getOffset(int x, int y) {
int offset = y * scanlineStride + x;
return offset;
}
/** Returns the bit offsets into the data array element representing
* a pixel for all bands.
* @return the bit offsets representing a pixel for all bands.
*/
public int [] getBitOffsets() {
return bitOffsets.clone();
}
/** Returns the bit masks for all bands.
* @return the bit masks for all bands.
*/
public int [] getBitMasks() {
return bitMasks.clone();
}
/** Returns the scanline stride of this SinglePixelPackedSampleModel.
* @return the scanline stride of this
* {@code SinglePixelPackedSampleModel}.
*/
public int getScanlineStride() {
return scanlineStride;
}
/**
* This creates a new SinglePixelPackedSampleModel with a subset of the
* bands of this SinglePixelPackedSampleModel. The new
* SinglePixelPackedSampleModel can be used with any DataBuffer that the
* existing SinglePixelPackedSampleModel can be used with. The new
* SinglePixelPackedSampleModel/DataBuffer combination will represent
* an image with a subset of the bands of the original
* SinglePixelPackedSampleModel/DataBuffer combination.
* @exception RasterFormatException if the length of the bands argument is
* greater than the number of bands in
* the sample model.
*/
public SampleModel createSubsetSampleModel(int[] bands) {
if (bands.length > numBands)
throw new RasterFormatException("There are only " +
numBands +
" bands");
int[] newBitMasks = new int[bands.length];
for (int i=0; i<bands.length; i++)
newBitMasks[i] = bitMasks[bands[i]];
return new SinglePixelPackedSampleModel(this.dataType, width, height,
this.scanlineStride, newBitMasks);
}
/**
* Returns data for a single pixel in a primitive array of type
* TransferType. For a SinglePixelPackedSampleModel, the array will
* have one element, and the type will be the same as the storage
* data type. 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}, whose storage layout is described by
* SinglePixelPackedSampleModel {@code sppsm1}, to
* DataBuffer {@code db2}, whose storage layout is described by
* SinglePixelPackedSampleModel {@code sppsm2}.
* The transfer will generally be more efficient than using
* getPixel/setPixel.
* <pre>
* SinglePixelPackedSampleModel sppsm1, sppsm2;
* DataBufferInt db1, db2;
* sppsm2.setDataElements(x, y, sppsm1.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.
* @return the data for the specified pixel.
* @see #setDataElements(int, int, Object, DataBuffer)
*/
public Object getDataElements(int x, int y, Object obj, DataBuffer data) {
// Bounds check for 'b' will be performed automatically
if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int type = getTransferType();
switch(type) {
case DataBuffer.TYPE_BYTE:
byte[] bdata;
if (obj == null)
bdata = new byte[1];
else
bdata = (byte[])obj;
bdata[0] = (byte)data.getElem(y * scanlineStride + x);
obj = (Object)bdata;
break;
case DataBuffer.TYPE_USHORT:
short[] sdata;
if (obj == null)
sdata = new short[1];
else
sdata = (short[])obj;
sdata[0] = (short)data.getElem(y * scanlineStride + x);
obj = (Object)sdata;
break;
case DataBuffer.TYPE_INT:
int[] idata;
if (obj == null)
idata = new int[1];
else
idata = (int[])obj;
idata[0] = data.getElem(y * scanlineStride + x);
obj = (Object)idata;
break;
}
return obj;
}
/**
* Returns all samples in 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.
* @return all samples for the specified pixel.
* @see #setPixel(int, int, int[], DataBuffer)
*/
public int [] getPixel(int x, int y, int[] iArray, DataBuffer data) {
if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int[] pixels;
if (iArray == null) {
pixels = new int [numBands];
} else {
pixels = iArray;
}
int value = data.getElem(y * scanlineStride + x);
for (int i=0; i<numBands; i++) {
pixels[i] = (value & bitMasks[i]) >>> bitOffsets[i];
}
return pixels;
}
/**
* Returns all samples for the specified rectangle of pixels in
* an int array, 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 If non-null, returns the samples in this array.
* @param data The DataBuffer containing the image data.
* @return all samples for the specified region of pixels.
* @see #setPixels(int, int, int, int, int[], DataBuffer)
*/
public int[] getPixels(int x, int y, int w, int h,
int[] iArray, DataBuffer data) {
int x1 = x + w;
int y1 = y + h;
if (x < 0 || x >= width || w > width || x1 < 0 || x1 > width ||
y < 0 || y >= height || h > height || y1 < 0 || y1 > height)
{
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int[] pixels;
if (iArray != null) {
pixels = iArray;
} else {
pixels = new int [w*h*numBands];
}
int lineOffset = y*scanlineStride + x;
int dstOffset = 0;
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
int value = data.getElem(lineOffset+j);
for (int k=0; k < numBands; k++) {
pixels[dstOffset++] =
((value & bitMasks[k]) >>> bitOffsets[k]);
}
}
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.
* @return the sample in a specified band for the specified
* pixel.
* @see #setSample(int, int, int, int, DataBuffer)
*/
public int getSample(int x, int y, int b, DataBuffer data) {
// Bounds check for 'b' will be performed automatically
if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int sample = data.getElem(y * scanlineStride + x);
return ((sample & bitMasks[b]) >>> bitOffsets[b]);
}
/**
* Returns the samples for a specified band for the specified rectangle
* of pixels in an int array, 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 b The band to return.
* @param iArray If non-null, returns the samples in this array.
* @param data The DataBuffer containing the image data.
* @return the samples for the specified band for the specified
* region of pixels.
* @see #setSamples(int, int, int, int, int, int[], DataBuffer)
*/
public int[] getSamples(int x, int y, int w, int h, int b,
int[] iArray, DataBuffer data) {
// Bounds check for 'b' will be performed automatically
if ((x < 0) || (y < 0) || (x + w > width) || (y + h > height)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int[] samples;
if (iArray != null) {
samples = iArray;
} else {
samples = new int [w*h];
}
int lineOffset = y*scanlineStride + x;
int dstOffset = 0;
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
int value = data.getElem(lineOffset+j);
samples[dstOffset++] =
((value & bitMasks[b]) >>> bitOffsets[b]);
}
lineOffset += scanlineStride;
}
return samples;
}
/**
* Sets the data for a single pixel in the specified DataBuffer from a
* primitive array of type TransferType. For a
* SinglePixelPackedSampleModel, only the first element of the array
* will hold valid data, and the type of the array must be the same as
* the storage data type of the SinglePixelPackedSampleModel.
* <p>
* The following code illustrates transferring data for one pixel from
* DataBuffer {@code db1}, whose storage layout is described by
* SinglePixelPackedSampleModel {@code sppsm1},
* to DataBuffer {@code db2}, whose storage layout is described by
* SinglePixelPackedSampleModel {@code sppsm2}.
* The transfer will generally be more efficient than using
* getPixel/setPixel.
* <pre>
* SinglePixelPackedSampleModel sppsm1, sppsm2;
* DataBufferInt db1, db2;
* sppsm2.setDataElements(x, y, sppsm1.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 A primitive array containing pixel data.
* @param data The DataBuffer containing the image data.
* @see #getDataElements(int, int, Object, DataBuffer)
*/
public void setDataElements(int x, int y, Object obj, DataBuffer data) {
if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int type = getTransferType();
switch(type) {
case DataBuffer.TYPE_BYTE:
byte[] barray = (byte[])obj;
data.setElem(y*scanlineStride+x, ((int)barray[0])&0xff);
break;
case DataBuffer.TYPE_USHORT:
short[] sarray = (short[])obj;
data.setElem(y*scanlineStride+x, ((int)sarray[0])&0xffff);
break;
case DataBuffer.TYPE_INT:
int[] iarray = (int[])obj;
data.setElem(y*scanlineStride+x, iarray[0]);
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.
* @see #getPixel(int, int, int[], DataBuffer)
*/
public void setPixel(int x, int y,
int[] iArray,
DataBuffer data) {
if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int lineOffset = y * scanlineStride + x;
int value = data.getElem(lineOffset);
for (int i=0; i < numBands; i++) {
value &= ~bitMasks[i];
value |= ((iArray[i] << bitOffsets[i]) & bitMasks[i]);
}
data.setElem(lineOffset, value);
}
/**
* 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.
* @see #getPixels(int, int, int, int, int[], DataBuffer)
*/
public void setPixels(int x, int y, int w, int h,
int[] iArray, DataBuffer data) {
int x1 = x + w;
int y1 = y + h;
if (x < 0 || x >= width || w > width || x1 < 0 || x1 > width ||
y < 0 || y >= height || h > height || y1 < 0 || y1 > height)
{
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int lineOffset = y*scanlineStride + x;
int srcOffset = 0;
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
int value = data.getElem(lineOffset+j);
for (int k=0; k < numBands; k++) {
value &= ~bitMasks[k];
int srcValue = iArray[srcOffset++];
value |= ((srcValue << bitOffsets[k])
& bitMasks[k]);
}
data.setElem(lineOffset+j, value);
}
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.
* @see #getSample(int, int, int, DataBuffer)
*/
public void setSample(int x, int y, int b, int s,
DataBuffer data) {
// Bounds check for 'b' will be performed automatically
if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int value = data.getElem(y*scanlineStride + x);
value &= ~bitMasks[b];
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