JDK8/Java8源码在线阅读
/*
* Copyright (c) 1997, 2013, 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*** As an unpublished work pursuant to Title 17 of the United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 image data which is stored such that each sample
* of a pixel occupies one data element of the DataBuffer. It stores the
* N samples which make up a pixel in N separate data array elements.
* Different bands may be in different banks of the DataBuffer.
* Accessor methods are provided so that image data can be manipulated
* directly. This class can support different kinds of interleaving, e.g.
* band interleaving, scanline interleaving, and pixel interleaving.
* Pixel stride is the number of data array elements between two samples
* for the same band on the same scanline. 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. This class can represent image
* data for which each sample is an unsigned integral number which can be
* stored in 8, 16, or 32 bits (using <code>DataBuffer.TYPE_BYTE</code>,
* <code>DataBuffer.TYPE_USHORT</code>, or <code>DataBuffer.TYPE_INT</code>,
* respectively), data for which each sample is a signed integral number
* which can be stored in 16 bits (using <code>DataBuffer.TYPE_SHORT</code>),
* or data for which each sample is a signed float or double quantity
* (using <code>DataBuffer.TYPE_FLOAT</code> or
* <code>DataBuffer.TYPE_DOUBLE</code>, respectively).
* All samples of a given ComponentSampleModel
* are stored with the same precision. All strides and offsets must be
* non-negative. 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},
* {@link DataBuffer#TYPE_FLOAT TYPE_FLOAT},
* {@link DataBuffer#TYPE_DOUBLE TYPE_DOUBLE},
* @see java.awt.image.PixelInterleavedSampleModel
* @see java.awt.image.BandedSampleModel
*/
public class ComponentSampleModel extends SampleModel
{
/** Offsets for all bands in data array elements. */
protected int bandOffsets[];
/** Index for each bank storing a band of image data. */
protected int[] bankIndices;
/**
* The number of bands in this
* <code>ComponentSampleModel</code>.
*/
protected int numBands = 1;
/**
* The number of banks in this
* <code>ComponentSampleModel</code>.
*/
protected int numBanks = 1;
/**
* Line stride (in data array elements) of the region of image
* data described by this ComponentSampleModel.
*/
protected int scanlineStride;
/** Pixel stride (in data array elements) of the region of image
* data described by this ComponentSampleModel.
*/
protected int pixelStride;
static private native void initIDs();
static {
ColorModel.loadLibraries();
initIDs();
}
/**
* Constructs a ComponentSampleModel with the specified parameters.
* The number of bands will be given by the length of the bandOffsets array.
* All bands will be stored in the first bank of the DataBuffer.
* @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 pixelStride the pixel stride of the region of image
* data described
* @param scanlineStride the line stride of the region of image
* data described
* @param bandOffsets the offsets of all bands
* @throws IllegalArgumentException if <code>w</code> or
* <code>h</code> is not greater than 0
* @throws IllegalArgumentException if <code>pixelStride</code>
* is less than 0
* @throws IllegalArgumentException if <code>scanlineStride</code>
* is less than 0
* @throws IllegalArgumentException if <code>numBands</code>
* is less than 1
* @throws IllegalArgumentException if the product of <code>w</code>
* and <code>h</code> is greater than
* <code>Integer.MAX_VALUE</code>
* @throws IllegalArgumentException if <code>dataType</code> is not
* one of the supported data types
*/
public ComponentSampleModel(int dataType,
int w, int h,
int pixelStride,
int scanlineStride,
int bandOffsets[]) {
super(dataType, w, h, bandOffsets.length);
this.dataType = dataType;
this.pixelStride = pixelStride;
this.scanlineStride = scanlineStride;
this.bandOffsets = (int[])bandOffsets.clone();
numBands = this.bandOffsets.length;
if (pixelStride < 0) {
throw new IllegalArgumentException("Pixel stride must be >= 0");
}
// TODO - bug 4296691 - remove this check
if (scanlineStride < 0) {
throw new IllegalArgumentException("Scanline stride must be >= 0");
}
if (numBands < 1) {
throw new IllegalArgumentException("Must have at least one band.");
}
if ((dataType < DataBuffer.TYPE_BYTE) ||
(dataType > DataBuffer.TYPE_DOUBLE)) {
throw new IllegalArgumentException("Unsupported dataType.");
}
bankIndices = new int[numBands];
for (int i=0; i<numBands; i++) {
bankIndices[i] = 0;
}
verify();
}
/**
* Constructs a ComponentSampleModel with the specified parameters.
* The number of bands will be given by the length of the bandOffsets array.
* Different bands may be stored in different banks of the DataBuffer.
*
* @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 pixelStride the pixel stride of the region of image
* data described
* @param scanlineStride The line stride of the region of image
* data described
* @param bankIndices the bank indices of all bands
* @param bandOffsets the band offsets of all bands
* @throws IllegalArgumentException if <code>w</code> or
* <code>h</code> is not greater than 0
* @throws IllegalArgumentException if <code>pixelStride</code>
* is less than 0
* @throws IllegalArgumentException if <code>scanlineStride</code>
* is less than 0
* @throws IllegalArgumentException if the length of
* <code>bankIndices</code> does not equal the length of
* <code>bankOffsets</code>
* @throws IllegalArgumentException if any of the bank indices
* of <code>bandIndices</code> is less than 0
* @throws IllegalArgumentException if <code>dataType</code> is not
* one of the supported data types
*/
public ComponentSampleModel(int dataType,
int w, int h,
int pixelStride,
int scanlineStride,
int bankIndices[],
int bandOffsets[]) {
super(dataType, w, h, bandOffsets.length);
this.dataType = dataType;
this.pixelStride = pixelStride;
this.scanlineStride = scanlineStride;
this.bandOffsets = (int[])bandOffsets.clone();
this.bankIndices = (int[]) bankIndices.clone();
if (pixelStride < 0) {
throw new IllegalArgumentException("Pixel stride must be >= 0");
}
// TODO - bug 4296691 - remove this check
if (scanlineStride < 0) {
throw new IllegalArgumentException("Scanline stride must be >= 0");
}
if ((dataType < DataBuffer.TYPE_BYTE) ||
(dataType > DataBuffer.TYPE_DOUBLE)) {
throw new IllegalArgumentException("Unsupported dataType.");
}
int maxBank = this.bankIndices[0];
if (maxBank < 0) {
throw new IllegalArgumentException("Index of bank 0 is less than "+
"0 ("+maxBank+")");
}
for (int i=1; i < this.bankIndices.length; i++) {
if (this.bankIndices[i] > maxBank) {
maxBank = this.bankIndices[i];
}
else if (this.bankIndices[i] < 0) {
throw new IllegalArgumentException("Index of bank "+i+
" is less than 0 ("+
maxBank+")");
}
}
numBanks = maxBank+1;
numBands = this.bandOffsets.length;
if (this.bandOffsets.length != this.bankIndices.length) {
throw new IllegalArgumentException("Length of bandOffsets must "+
"equal length of bankIndices.");
}
verify();
}
private void verify() {
int requiredSize = getBufferSize();
}
/**
* Returns the size of the data buffer (in data elements) needed
* for a data buffer that matches this ComponentSampleModel.
*/
private int getBufferSize() {
int maxBandOff=bandOffsets[0];
for (int i=1; i<bandOffsets.length; i++) {
maxBandOff = Math.max(maxBandOff,bandOffsets[i]);
}
if (maxBandOff < 0 || maxBandOff > (Integer.MAX_VALUE - 1)) {
throw new IllegalArgumentException("Invalid band offset");
}
if (pixelStride < 0 || pixelStride > (Integer.MAX_VALUE / width)) {
throw new IllegalArgumentException("Invalid pixel stride");
}
if (scanlineStride < 0 || scanlineStride > (Integer.MAX_VALUE / height)) {
throw new IllegalArgumentException("Invalid scanline stride");
}
int size = maxBandOff + 1;
int val = pixelStride * (width - 1);
if (val > (Integer.MAX_VALUE - size)) {
throw new IllegalArgumentException("Invalid pixel stride");
}
size += val;
val = scanlineStride * (height - 1);
if (val > (Integer.MAX_VALUE - size)) {
throw new IllegalArgumentException("Invalid scan stride");
}
size += val;
return size;
}
/**
* Preserves band ordering with new step factor...
*/
int []orderBands(int orig[], int step) {
int map[] = new int[orig.length];
int ret[] = new int[orig.length];
for (int i=0; i<map.length; i++) map[i] = i;
for (int i = 0; i < ret.length; i++) {
int index = i;
for (int j = i+1; j < ret.length; j++) {
if (orig[map[index]] > orig[map[j]]) {
index = j;
}
}
ret[map[index]] = i*step;
map[index] = map[i];
}
return ret;
}
/**
* Creates a new <code>ComponentSampleModel</code> with the specified
* width and height. The new <code>SampleModel</code> will have the same
* number of bands, storage data type, interleaving scheme, and
* pixel stride as this <code>SampleModel</code>.
* @param w the width of the resulting <code>SampleModel</code>
* @param h the height of the resulting <code>SampleModel</code>
* @return a new <code>ComponentSampleModel</code> with the specified size
* @throws IllegalArgumentException if <code>w</code> or
* <code>h</code> is not greater than 0
*/
public SampleModel createCompatibleSampleModel(int w, int h) {
SampleModel ret=null;
long size;
int minBandOff=bandOffsets[0];
int maxBandOff=bandOffsets[0];
for (int i=1; i<bandOffsets.length; i++) {
minBandOff = Math.min(minBandOff,bandOffsets[i]);
maxBandOff = Math.max(maxBandOff,bandOffsets[i]);
}
maxBandOff -= minBandOff;
int bands = bandOffsets.length;
int bandOff[];
int pStride = Math.abs(pixelStride);
int lStride = Math.abs(scanlineStride);
int bStride = Math.abs(maxBandOff);
if (pStride > lStride) {
if (pStride > bStride) {
if (lStride > bStride) { // pix > line > band
bandOff = new int[bandOffsets.length];
for (int i=0; i<bands; i++)
bandOff[i] = bandOffsets[i]-minBandOff;
lStride = bStride+1;
pStride = lStride*h;
} else { // pix > band > line
bandOff = orderBands(bandOffsets,lStride*h);
pStride = bands*lStride*h;
}
} else { // band > pix > line
pStride = lStride*h;
bandOff = orderBands(bandOffsets,pStride*w);
}
} else {
if (pStride > bStride) { // line > pix > band
bandOff = new int[bandOffsets.length];
for (int i=0; i<bands; i++)
bandOff[i] = bandOffsets[i]-minBandOff;
pStride = bStride+1;
lStride = pStride*w;
} else {
if (lStride > bStride) { // line > band > pix
bandOff = orderBands(bandOffsets,pStride*w);
lStride = bands*pStride*w;
} else { // band > line > pix
lStride = pStride*w;
bandOff = orderBands(bandOffsets,lStride*h);
}
}
}
// make sure we make room for negative offsets...
int base = 0;
if (scanlineStride < 0) {
base += lStride*h;
lStride *= -1;
}
if (pixelStride < 0) {
base += pStride*w;
pStride *= -1;
}
for (int i=0; i<bands; i++)
bandOff[i] += base;
return new ComponentSampleModel(dataType, w, h, pStride,
lStride, bankIndices, bandOff);
}
/**
* Creates a new ComponentSampleModel with a subset of the bands
* of this ComponentSampleModel. The new ComponentSampleModel can be
* used with any DataBuffer that the existing ComponentSampleModel
* can be used with. The new ComponentSampleModel/DataBuffer
* combination will represent an image with a subset of the bands
* of the original ComponentSampleModel/DataBuffer combination.
* @param bands a subset of bands from this
* <code>ComponentSampleModel</code>
* @return a <code>ComponentSampleModel</code> created with a subset
* of bands from this <code>ComponentSampleModel</code>.
*/
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 ComponentSampleModel(this.dataType, width, height,
this.pixelStride,
this.scanlineStride,
newBankIndices, newBandOffsets);
}
/**
* Creates a <code>DataBuffer</code> that corresponds to this
* <code>ComponentSampleModel</code>.
* The <code>DataBuffer</code> object's data type, number of banks,
* and size are be consistent with this <code>ComponentSampleModel</code>.
* @return a <code>DataBuffer</code> whose data type, number of banks
* and size are consistent with this
* <code>ComponentSampleModel</code>.
*/
public DataBuffer createDataBuffer() {
DataBuffer dataBuffer = null;
int size = getBufferSize();
switch (dataType) {
case DataBuffer.TYPE_BYTE:
dataBuffer = new DataBufferByte(size, numBanks);
break;
case DataBuffer.TYPE_USHORT:
dataBuffer = new DataBufferUShort(size, numBanks);
break;
case DataBuffer.TYPE_SHORT:
dataBuffer = new DataBufferShort(size, numBanks);
break;
case DataBuffer.TYPE_INT:
dataBuffer = new DataBufferInt(size, numBanks);
break;
case DataBuffer.TYPE_FLOAT:
dataBuffer = new DataBufferFloat(size, numBanks);
break;
case DataBuffer.TYPE_DOUBLE:
dataBuffer = new DataBufferDouble(size, numBanks);
break;
}
return dataBuffer;
}
/** Gets the offset for the first band of pixel (x,y).
* A sample of the first band can be retrieved from a
* <code>DataBuffer</code>
* <code>data</code> with a <code>ComponentSampleModel</code>
* <code>csm</code> as
* <pre>
* data.getElem(csm.getOffset(x, y));
* </pre>
* @param x the X location of the pixel
* @param y the Y location of the pixel
* @return the offset for the first band of the specified pixel.
*/
public int getOffset(int x, int y) {
int offset = y*scanlineStride + x*pixelStride + bandOffsets[0];
return offset;
}
/** Gets the offset for band b of pixel (x,y).
* A sample of band <code>b</code> can be retrieved from a
* <code>DataBuffer</code> <code>data</code>
* with a <code>ComponentSampleModel</code> <code>csm</code> as
* <pre>
* data.getElem(csm.getOffset(x, y, b));
* </pre>
* @param x the X location of the specified pixel
* @param y the Y location of the specified pixel
* @param b the specified band
* @return the offset for the specified band of the specified pixel.
*/
public int getOffset(int x, int y, int b) {
int offset = y*scanlineStride + x*pixelStride + bandOffsets[b];
return offset;
}
/** Returns the number of bits per sample for all bands.
* @return an array containing the number of bits per sample
* for all bands, where each element in the array
* represents a band.
*/
public final int[] getSampleSize() {
int sampleSize[] = new int [numBands];
int sizeInBits = getSampleSize(0);
for (int i=0; i<numBands; i++)
sampleSize[i] = sizeInBits;
return sampleSize;
}
/** Returns the number of bits per sample for the specified band.
* @param band the specified band
* @return the number of bits per sample for the specified band.
*/
public final int getSampleSize(int band) {
return DataBuffer.getDataTypeSize(dataType);
}
/** Returns the bank indices for all bands.
* @return the bank indices for all bands.
*/
public final int [] getBankIndices() {
return (int[]) bankIndices.clone();
}
/** Returns the band offset for all bands.
* @return the band offsets for all bands.
*/
public final int [] getBandOffsets() {
return (int[])bandOffsets.clone();
}
/** Returns the scanline stride of this ComponentSampleModel.
* @return the scanline stride of this <code>ComponentSampleModel</code>.
*/
public final int getScanlineStride() {
return scanlineStride;
}
/** Returns the pixel stride of this ComponentSampleModel.
* @return the pixel stride of this <code>ComponentSampleModel</code>.
*/
public final int getPixelStride() {
return pixelStride;
}
/**
* Returns the number of data elements needed to transfer a pixel
* with the
* {@link #getDataElements(int, int, Object, DataBuffer) } and
* {@link #setDataElements(int, int, Object, DataBuffer) }
* methods.
* For a <code>ComponentSampleModel</code>, this is identical to the
* number of bands.
* @return the number of data elements needed to transfer a pixel with
* the <code>getDataElements</code> and
* <code>setDataElements</code> methods.
* @see java.awt.image.SampleModel#getNumDataElements
* @see #getNumBands
*/
public final int getNumDataElements() {
return getNumBands();
}
/**
* Returns data for a single pixel in a primitive array of type
* <code>TransferType</code>. For a <code>ComponentSampleModel</code>,
* this is the same as the data type, and samples are returned
* one per array element. Generally, <code>obj</code> should
* be passed in as <code>null</code>, so that the <code>Object</code>
* is created automatically and is the right primitive data type.
* <p>
* The following code illustrates transferring data for one pixel from
* <code>DataBuffer</code> <code>db1</code>, whose storage layout is
* described by <code>ComponentSampleModel</code> <code>csm1</code>,
* to <code>DataBuffer</code> <code>db2</code>, whose storage layout
* is described by <code>ComponentSampleModel</code> <code>csm2</code>.
* The transfer is usually more efficient than using
* <code>getPixel</code> and <code>setPixel</code>.
* <pre>
* ComponentSampleModel csm1, csm2;
* DataBufferInt db1, db2;
* csm2.setDataElements(x, y,
* csm1.getDataElements(x, y, null, db1), db2);
* </pre>
*
* Using <code>getDataElements</code> and <code>setDataElements</code>
* to transfer between two <code>DataBuffer/SampleModel</code>
* pairs is legitimate if the <code>SampleModel</code> objects have
* the same number of bands, corresponding bands have the same number of
* bits per sample, and the <code>TransferType</code>s are the same.
* <p>
* If <code>obj</code> is not <code>null</code>, it should be a
* primitive array of type <code>TransferType</code>.
* Otherwise, a <code>ClassCastException</code> is thrown. An
* <code>ArrayIndexOutOfBoundsException</code> might be thrown if the
* coordinates are not in bounds, or if <code>obj</code> is not
* <code>null</code> 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-<code>null</code>, a primitive array
* in which to return the pixel data
* @param data the <code>DataBuffer</code> containing the image data
* @return the data of the specified pixel
* @see #setDataElements(int, int, Object, DataBuffer)
*
* @throws NullPointerException if data is null.
* @throws ArrayIndexOutOfBoundsException if the coordinates are
* not in bounds, or if obj is too small to hold the output.
*/
public Object getDataElements(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();
int numDataElems = getNumDataElements();
int pixelOffset = y*scanlineStride + x*pixelStride;
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;
case DataBuffer.TYPE_FLOAT:
float[] fdata;
if (obj == null)
fdata = new float[numDataElems];
else
fdata = (float[])obj;
for (int i=0; i<numDataElems; i++) {
fdata[i] = data.getElemFloat(bankIndices[i],
pixelOffset + bandOffsets[i]);
}
obj = (Object)fdata;
break;
case DataBuffer.TYPE_DOUBLE:
double[] ddata;
if (obj == null)
ddata = new double[numDataElems];
else
ddata = (double[])obj;
for (int i=0; i<numDataElems; i++) {
ddata[i] = data.getElemDouble(bankIndices[i],
pixelOffset + bandOffsets[i]);
}
obj = (Object)ddata;
break;
}
return obj;
}
/**
* Returns all samples for the specified pixel in an int array,
* one sample per array element.
* An <code>ArrayIndexOutOfBoundsException</code> might 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 the samples of the specified pixel.
* @see #setPixel(int, int, int[], DataBuffer)
*
* @throws NullPointerException if data is null.
* @throws ArrayIndexOutOfBoundsException if the coordinates are
* not in bounds, or if iArray is too small to hold the output.
*/
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 = iArray;
} else {
pixels = new int [numBands];
}
int pixelOffset = y*scanlineStride + x*pixelStride;
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 array element.
* An <code>ArrayIndexOutOfBoundsException</code> might 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 the samples of the pixels within the specified region.
* @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 || y > 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*pixelStride;
int srcOffset = 0;
for (int i = 0; i < h; i++) {
int pixelOffset = lineOffset;
for (int j = 0; j < w; j++) {
for (int k=0; k < numBands; k++) {
pixels[srcOffset++] =
data.getElem(bankIndices[k], pixelOffset + bandOffsets[k]);
}
pixelOffset += pixelStride;
}
lineOffset += scanlineStride;
}
return pixels;
}
/**
* Returns as int the sample in a specified band for the pixel
* located at (x,y).
* An <code>ArrayIndexOutOfBoundsException</code> might 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 <code>DataBuffer</code> 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(bankIndices[b],
y*scanlineStride + x*pixelStride +
bandOffsets[b]);
return sample;
}
/**
* Returns the sample in a specified band
* for the pixel located at (x,y) as a float.
* An <code>ArrayIndexOutOfBoundsException</code> might 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 a float value representing the sample in the specified
* band for the specified pixel.
*/
public float getSampleFloat(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!");
}
float sample = data.getElemFloat(bankIndices[b],
y*scanlineStride + x*pixelStride +
bandOffsets[b]);
return sample;
}
/**
* Returns the sample in a specified band
* for a pixel located at (x,y) as a double.
* An <code>ArrayIndexOutOfBoundsException</code> might 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 a double value representing the sample in the specified
* band for the specified pixel.
*/
public double getSampleDouble(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!");
}
double sample = data.getElemDouble(bankIndices[b],
y*scanlineStride + x*pixelStride +
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.
* An <code>ArrayIndexOutOfBoundsException</code> might 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-<code>null</code>, returns the samples
* in this array
* @param data the <code>DataBuffer</code> containing the image data
* @return the samples in the specified band of the specified pixel
* @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*pixelStride + bandOffsets[b];
int srcOffset = 0;
for (int i = 0; i < h; i++) {
int sampleOffset = lineOffset;
for (int j = 0; j < w; j++) {
samples[srcOffset++] = data.getElem(bankIndices[b],
sampleOffset);
sampleOffset += pixelStride;
}
lineOffset += scanlineStride;
}
return samples;
}
/**
* Sets the data for a single pixel in the specified
* <code>DataBuffer</code> from a primitive array of type
* <code>TransferType</code>. For a <code>ComponentSampleModel</code>,
* this is 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
* <code>DataBuffer</code> <code>db1</code>, whose storage layout is
* described by <code>ComponentSampleModel</code> <code>csm1</code>,
* to <code>DataBuffer</code> <code>db2</code>, whose storage layout
* is described by <code>ComponentSampleModel</code> <code>csm2</code>.
* The transfer is usually more efficient than using
* <code>getPixel</code> and <code>setPixel</code>.
* <pre>
* ComponentSampleModel csm1, csm2;
* DataBufferInt db1, db2;
* csm2.setDataElements(x, y, csm1.getDataElements(x, y, null, db1),
* db2);
* </pre>
* Using <code>getDataElements</code> and <code>setDataElements</code>
* to transfer between two <code>DataBuffer/SampleModel</code> pairs
* is legitimate if the <code>SampleModel</code> objects have
* the same number of bands, corresponding bands have the same number of
* bits per sample, and the <code>TransferType</code>s are the same.
* <p>
* A <code>ClassCastException</code> is thrown if <code>obj</code> is not
* a primitive array of type <code>TransferType</code>.
* An <code>ArrayIndexOutOfBoundsException</code> might be thrown if
* the coordinates are not in bounds, or if <code>obj</code> 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();
int numDataElems = getNumDataElements();
int pixelOffset = y*scanlineStride + x*pixelStride;
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;
case DataBuffer.TYPE_FLOAT:
float[] farray = (float[])obj;
for (int i=0; i<numDataElems; i++) {
data.setElemFloat(bankIndices[i],
pixelOffset + bandOffsets[i], farray[i]);
}
break;
case DataBuffer.TYPE_DOUBLE:
double[] darray = (double[])obj;
for (int i=0; i<numDataElems; i++) {
data.setElemDouble(bankIndices[i],
pixelOffset + bandOffsets[i], darray[i]);
}
break;
}
}
/**
* Sets a pixel in the <code>DataBuffer</code> using an int array of
* samples for input. An <code>ArrayIndexOutOfBoundsException</code>
* might 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 pixelOffset = y*scanlineStride + x*pixelStride;
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.
* An <code>ArrayIndexOutOfBoundsException</code> might 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*pixelStride;
int srcOffset = 0;
for (int i = 0; i < h; i++) {
int pixelOffset = lineOffset;
for (int j = 0; j < w; j++) {
for (int k=0; k < numBands; k++) {
data.setElem(bankIndices[k], pixelOffset + bandOffsets[k],
iArray[srcOffset++]);
}
pixelOffset += pixelStride;
}
lineOffset += scanlineStride;
}
}
/**
* Sets a sample in the specified band for the pixel located at (x,y)
* in the <code>DataBuffer</code> using an int for input.
* An <code>ArrayIndexOutOfBoundsException</code> might 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!");
}
data.setElem(bankIndices[b],
y*scanlineStride + x*pixelStride + bandOffsets[b], s);
}
/**
* Sets a sample in the specified band for the pixel located at (x,y)
* in the <code>DataBuffer</code> using a float for input.
* An <code>ArrayIndexOutOfBoundsException</code> might be thrown if
* the coordinates are not in bounds.
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java