Java example source code file (ShortComponentRaster.java)
The ShortComponentRaster.java Java example source code/*
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* 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
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package sun.awt.image;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.awt.image.RasterFormatException;
import java.awt.image.SampleModel;
import java.awt.image.ComponentSampleModel;
import java.awt.image.SinglePixelPackedSampleModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferUShort;
import java.awt.Rectangle;
import java.awt.Point;
/**
* This class defines a Raster with pixels consisting of one or more 16-bit
* data elements stored in close proximity to each other in a short integer
* array. The bit precision per data element is that
* of the data type (that is, the bit precision for this Raster is 16).
* There is only one pixel stride and one scanline stride for all
* bands. This type of Raster can be used with a
* ComponentColorModel if there are multiple bands, or a
* IndexColorModel if there is only one band.
* <p>
* For example, 5-6-5 RGB image data can be represented by a
* ShortComponentRaster using a SinglePixelPackedSampleModel and
* a ComponentColorModel.
*
*
*/
public class ShortComponentRaster extends SunWritableRaster {
/** private band offset for use by native code */
protected int bandOffset;
/** Data offsets for each band of image data. */
protected int[] dataOffsets;
/** Scanline stride of the image data contained in this Raster. */
protected int scanlineStride;
/** Pixel stride of the image data contained in this Raster. */
protected int pixelStride;
/** The image data array. */
protected short[] data;
int type;
/** A cached copy of minX + width for use in bounds checks. */
private int maxX;
/** A cached copy of minY + height for use in bounds checks. */
private int maxY;
static private native void initIDs();
static {
/* ensure that the necessary native libraries are loaded */
NativeLibLoader.loadLibraries();
initIDs();
}
/**
* Constructs a ShortComponentRaster with the given SampleModel.
* The Raster's upper left corner is origin and it is the same
* size as the SampleModel. A DataBuffer large enough to describe the
* Raster is automatically created. SampleModel must be of type
* ComponentSampleModel or SinglePixelPackedSampleModel.
* @param sampleModel The SampleModel that specifies the layout.
* @param origin The Point that specified the origin.
*/
public ShortComponentRaster(SampleModel sampleModel, Point origin) {
this(sampleModel,
sampleModel.createDataBuffer(),
new Rectangle(origin.x,
origin.y,
sampleModel.getWidth(),
sampleModel.getHeight()),
origin,
null);
}
/**
* Constructs a ShortComponentRaster with the given SampleModel
* and DataBuffer. The Raster's upper left corner is origin and
* it is the same sizes the SampleModel. The DataBuffer is not
* initialized and must be a DataBufferUShort compatible with SampleModel.
* SampleModel must be of type ComponentSampleModel or
* SinglePixelPackedSampleModel.
* @param sampleModel The SampleModel that specifies the layout.
* @param dataBuffer The DataBufferUShort that contains the image data.
* @param origin The Point that specifies the origin.
*/
public ShortComponentRaster(SampleModel sampleModel,
DataBuffer dataBuffer,
Point origin) {
this(sampleModel,
dataBuffer,
new Rectangle(origin.x,
origin.y,
sampleModel.getWidth(),
sampleModel.getHeight()),
origin,
null);
}
/**
* Constructs a ShortComponentRaster with the given SampleModel,
* DataBuffer, and parent. DataBuffer must be a DataBufferUShort and
* SampleModel must be of type ComponentSampleModel or
* SinglePixelPackedSampleModel. When translated into the base Raster's
* coordinate system, aRegion must be contained by the base Raster.
* Origin is the coodinate in the new Raster's coordinate system of
* the origin of the base Raster. (The base Raster is the Raster's
* ancestor which has no parent.)
*
* Note that this constructor should generally be called by other
* constructors or create methods, it should not be used directly.
* @param sampleModel The SampleModel that specifies the layout.
* @param dataBuffer The DataBufferUShort that contains the image data.
* @param aRegion The Rectangle that specifies the image area.
* @param origin The Point that specifies the origin.
* @param parent The parent (if any) of this raster.
*/
public ShortComponentRaster(SampleModel sampleModel,
DataBuffer dataBuffer,
Rectangle aRegion,
Point origin,
ShortComponentRaster parent) {
super(sampleModel, dataBuffer, aRegion, origin, parent);
this.maxX = minX + width;
this.maxY = minY + height;
if(!(dataBuffer instanceof DataBufferUShort)) {
throw new RasterFormatException("ShortComponentRasters must have "+
"short DataBuffers");
}
DataBufferUShort dbus = (DataBufferUShort)dataBuffer;
this.data = stealData(dbus, 0);
if (dbus.getNumBanks() != 1) {
throw new
RasterFormatException("DataBuffer for ShortComponentRasters"+
" must only have 1 bank.");
}
int dbOffset = dbus.getOffset();
if (sampleModel instanceof ComponentSampleModel) {
ComponentSampleModel csm = (ComponentSampleModel)sampleModel;
this.type = IntegerComponentRaster.TYPE_USHORT_SAMPLES;
this.scanlineStride = csm.getScanlineStride();
this.pixelStride = csm.getPixelStride();
this.dataOffsets = csm.getBandOffsets();
int xOffset = aRegion.x - origin.x;
int yOffset = aRegion.y - origin.y;
for (int i = 0; i < getNumDataElements(); i++) {
dataOffsets[i] += dbOffset +
xOffset*pixelStride+yOffset*scanlineStride;
}
} else if (sampleModel instanceof SinglePixelPackedSampleModel) {
SinglePixelPackedSampleModel sppsm =
(SinglePixelPackedSampleModel)sampleModel;
this.type = IntegerComponentRaster.TYPE_USHORT_PACKED_SAMPLES;
this.scanlineStride = sppsm.getScanlineStride();
this.pixelStride = 1;
this.dataOffsets = new int[1];
this.dataOffsets[0] = dbOffset;
int xOffset = aRegion.x - origin.x;
int yOffset = aRegion.y - origin.y;
dataOffsets[0] += xOffset+yOffset*scanlineStride;
} else {
throw new RasterFormatException("ShortComponentRasters must have"+
"ComponentSampleModel or SinglePixelPackedSampleModel");
}
this.bandOffset = this.dataOffsets[0];
verify();
}
/**
* Returns a copy of the data offsets array. For each band the data offset
* is the index into the band's data array, of the first sample of the
* band.
*/
public int[] getDataOffsets() {
return (int[]) dataOffsets.clone();
}
/**
* Returns the data offset for the specified band. The data offset
* is the index into the data array in which the first sample
* of the first scanline is stored.
* @param band The band whose offset is returned.
*/
public int getDataOffset(int band) {
return dataOffsets[band];
}
/**
* Returns the scanline stride -- the number of data array elements between
* a given sample and the same sample in the same column of the next row.
*/
public int getScanlineStride() {
return scanlineStride;
}
/**
* Returns pixel stride -- the number of data array elements between two
* samples for the same band on the same scanline.
*/
public int getPixelStride() {
return pixelStride;
}
/**
* Returns a reference to the data array.
*/
public short[] getDataStorage() {
return data;
}
/**
* Returns the data elements for all bands at the specified
* location.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinate is out of bounds.
* A ClassCastException will be thrown if the input object is non null
* and references anything other than an array of transferType.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param outData An object reference to an array of type defined by
* getTransferType() and length getNumDataElements().
* If null an array of appropriate type and size will be
* allocated.
* @return An object reference to an array of type defined by
* getTransferType() with the request pixel data.
*/
public Object getDataElements(int x, int y, Object obj) {
if ((x < this.minX) || (y < this.minY) ||
(x >= this.maxX) || (y >= this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
short outData[];
if (obj == null) {
outData = new short[numDataElements];
} else {
outData = (short[])obj;
}
int off = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
for (int band = 0; band < numDataElements; band++) {
outData[band] = data[dataOffsets[band] + off];
}
return outData;
}
/**
* Returns an array of data elements from the specified rectangular
* region.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* A ClassCastException will be thrown if the input object is non null
* and references anything other than an array of transferType.
* <pre>
* short[] bandData = (short[])Raster.getDataElements(x, y, w, h, null);
* int numDataElements = Raster.getBands();
* short[] pixel = new short[numDataElements];
* // To find the data element at location (x2, y2)
* System.arraycopy(bandData, ((y2-y)*w + (x2-x))*numDataElements,
* pixel, 0, numDataElements);
* </pre>
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param width Width of the pixel rectangle.
* @param height Height of the pixel rectangle.
* @param outData An object reference to an array of type defined by
* getTransferType() and length w*h*getNumDataElements().
* If null an array of appropriate type and size will be
* allocated.
* @return An object reference to an array of type defined by
* getTransferType() with the request pixel data.
*/
public Object getDataElements(int x, int y, int w, int h, Object obj) {
if ((x < this.minX) || (y < this.minY) ||
(x + w > this.maxX) || (y + h > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
short outData[];
if (obj == null) {
outData = new short[w*h*numDataElements];
} else {
outData = (short[])obj;
}
int yoff = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
int xoff;
int off = 0;
int xstart;
int ystart;
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
xoff = yoff;
for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
for (int c = 0; c < numDataElements; c++) {
outData[off++] = data[dataOffsets[c] + xoff];
}
}
}
return outData;
}
/**
* Returns a short integer array of data elements from the
* specified rectangular region.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* <pre>
* short[] bandData = Raster.getShortData(x, y, w, h, null);
* // To find the data element at location (x2, y2)
* short dataElenent = bandData[((y2-y)*w + (x2-x))];
* </pre>
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param width Width of the sample rectangle.
* @param height Height of the sample rectangle.
* @param band The band to return.
* @param outData If non-null, data elements for all bands
* at the specified location are returned in this array.
* @return Data array with data elements for all bands.
*/
public short[] getShortData(int x, int y, int w, int h,
int band, short[] outData) {
// Bounds check for 'band' will be performed automatically
if ((x < this.minX) || (y < this.minY) ||
(x + w > this.maxX) || (y + h > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
if (outData == null) {
outData = new short[numDataElements*w*h];
}
int yoff = (y-minY)*scanlineStride +
(x-minX)*pixelStride+ dataOffsets[band];
int xoff;
int off = 0;
int xstart;
int ystart;
if (pixelStride == 1) {
if (scanlineStride == w) {
System.arraycopy(data, yoff, outData, 0, w*h);
}
else {
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
System.arraycopy(data, yoff, outData, off, w);
off += w;
}
}
}
else {
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
xoff = yoff;
for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
outData[off++] = data[xoff];
}
}
}
return outData;
}
/**
* Returns a short integer array of data elements from the
* specified rectangular region.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* <pre>
* short[] bandData = Raster.getShortData(x, y, w, h, null);
* int numDataElements = Raster.getNumBands();
* short[] pixel = new short[numDataElements];
* // To find the data element at location (x2, y2)
* System.arraycopy(bandData, ((y2-y)*w + (x2-x))*numDataElements,
* pixel, 0, numDataElements);
* </pre>
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param width Width of the pixel rectangle.
* @param height Height of the pixel rectangle.
* @param outData If non-null, data elements for all bands
* at the specified location are returned in this array.
* @return Data array with data elements for all bands.
*/
public short[] getShortData(int x, int y, int w, int h, short[] outData) {
if ((x < this.minX) || (y < this.minY) ||
(x + w > this.maxX) || (y + h > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
if (outData == null) {
outData = new short[numDataElements*w*h];
}
int yoff = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
int xoff;
int off = 0;
int xstart;
int ystart;
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
xoff = yoff;
for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
for (int c = 0; c < numDataElements; c++) {
outData[off++] = data[dataOffsets[c] + xoff];
}
}
}
return outData;
}
/**
* Stores the data elements for all bands at the specified location.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinate is out of bounds.
* A ClassCastException will be thrown if the input object is non null
* and references anything other than an array of transferType.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param inData An object reference to an array of type defined by
* getTransferType() and length getNumDataElements()
* containing the pixel data to place at x,y.
*/
public void setDataElements(int x, int y, Object obj) {
if ((x < this.minX) || (y < this.minY) ||
(x >= this.maxX) || (y >= this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
short inData[] = (short[])obj;
int off = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
for (int i = 0; i < numDataElements; i++) {
data[dataOffsets[i] + off] = (short) inData[i];
}
markDirty();
}
/**
* Stores the Raster data at the specified location.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* @param x The X coordinate of the pixel location.
* @param y The Y coordinate of the pixel location.
* @param inRaster Raster of data to place at x,y location.
*/
public void setDataElements(int x, int y, Raster inRaster) {
int dstOffX = x + inRaster.getMinX();
int dstOffY = y + inRaster.getMinY();
int width = inRaster.getWidth();
int height = inRaster.getHeight();
if ((dstOffX < this.minX) || (dstOffY < this.minY) ||
(dstOffX + width > this.maxX) || (dstOffY + height > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
setDataElements(dstOffX, dstOffY, width, height, inRaster);
}
/**
* Stores the Raster data at the specified location.
* @param dstX The absolute X coordinate of the destination pixel
* that will receive a copy of the upper-left pixel of the
* inRaster
* @param dstY The absolute Y coordinate of the destination pixel
* that will receive a copy of the upper-left pixel of the
* inRaster
* @param width The number of pixels to store horizontally
* @param height The number of pixels to store vertically
* @param inRaster Raster of data to place at x,y location.
*/
private void setDataElements(int dstX, int dstY,
int width, int height,
Raster inRaster) {
// Assume bounds checking has been performed previously
if (width <= 0 || height <= 0) {
return;
}
// Write inRaster (minX, minY) to (dstX, dstY)
int srcOffX = inRaster.getMinX();
int srcOffY = inRaster.getMinY();
Object tdata = null;
// // REMIND: Do something faster!
// if (inRaster instanceof ShortComponentRaster) {
// }
for (int startY=0; startY < height; startY++) {
// Grab one scanline at a time
tdata = inRaster.getDataElements(srcOffX, srcOffY+startY,
width, 1, tdata);
setDataElements(dstX, dstY + startY, width, 1, tdata);
}
}
/**
* Stores an array of data elements into the specified rectangular
* region.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* A ClassCastException will be thrown if the input object is non null
* and references anything other than an array of transferType.
* The data elements in the
* data array are assumed to be packed. That is, a data element
* for the nth band at location (x2, y2) would be found at:
* <pre>
* inData[((y2-y)*w + (x2-x))*numDataElements + n]
* </pre>
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param w Width of the pixel rectangle.
* @param h Height of the pixel rectangle.
* @param inData An object reference to an array of type defined by
* getTransferType() and length w*h*getNumDataElements()
* containing the pixel data to place between x,y and
* x+h, y+h.
*/
public void setDataElements(int x, int y, int w, int h, Object obj) {
if ((x < this.minX) || (y < this.minY) ||
(x + w > this.maxX) || (y + h > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
short inData[] = (short[])obj;
int yoff = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
int xoff;
int off = 0;
int xstart;
int ystart;
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
xoff = yoff;
for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
for (int c = 0; c < numDataElements; c++) {
data[dataOffsets[c] + xoff] = (short) inData[off++];
}
}
}
markDirty();
}
/**
* Stores a short integer array of data elements into the
* specified rectangular region.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* The data elements in the
* data array are assumed to be packed. That is, a data element
* at location (x2, y2) would be found at:
* <pre>
* inData[((y2-y)*w + (x2-x))]
* </pre>
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param w Width of the pixel rectangle.
* @param h Height of the pixel rectangle.
* @param band The band to set.
* @param inData The data elements to be stored.
*/
public void putShortData(int x, int y, int w, int h,
int band, short[] inData) {
// Bounds check for 'band' will be performed automatically
if ((x < this.minX) || (y < this.minY) ||
(x + w > this.maxX) || (y + h > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int yoff = (y-minY)*scanlineStride +
(x-minX)*pixelStride + dataOffsets[band];
int xoff;
int off = 0;
int xstart;
int ystart;
if (pixelStride == 1) {
if (scanlineStride == w) {
System.arraycopy(inData, 0, data, yoff, w*h);
}
else {
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
System.arraycopy(inData, off, data, yoff, w);
off += w;
}
}
}
else {
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
xoff = yoff;
for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
data[xoff] = inData[off++];
}
}
}
markDirty();
}
/**
* Stores a short integer array of data elements into the
* specified rectangular region.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* The data elements in the
* data array are assumed to be packed. That is, a data element
* for the nth band at location (x2, y2) would be found at:
* <pre>
* inData[((y2-y)*w + (x2-x))*numDataElements + n]
* </pre>
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param w Width of the pixel rectangle.
* @param h Height of the pixel rectangle.
* @param inData The data elements to be stored.
*/
public void putShortData(int x, int y, int w, int h, short[] inData) {
if ((x < this.minX) || (y < this.minY) ||
(x + w > this.maxX) || (y + h > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int yoff = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
int xoff;
int off = 0;
int xstart;
int ystart;
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
xoff = yoff;
for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
for (int c = 0; c < numDataElements; c++) {
data[dataOffsets[c] + xoff] = inData[off++];
}
}
}
markDirty();
}
/**
* Creates a subraster given a region of the raster. The x and y
* coordinates specify the horizontal and vertical offsets
* from the upper-left corner of this raster to the upper-left corner
* of the subraster. A subset of the bands of the parent Raster may
* be specified. If this is null, then all the bands are present in the
* subRaster. A translation to the subRaster may also be specified.
* Note that the subraster will reference the same
* band objects as the parent raster, but using different offsets.
* @param x X offset.
* @param y Y offset.
* @param width Width (in pixels) of the subraster.
* @param height Height (in pixels) of the subraster.
* @param x0 Translated X origin of the subraster.
* @param y0 Translated Y origin of the subraster.
* @param bandList Array of band indices.
* @exception RasterFormatException
* if the specified bounding box is outside of the parent raster.
*/
public Raster createChild (int x, int y,
int width, int height,
int x0, int y0, int[] bandList) {
WritableRaster newRaster = createWritableChild(x, y,
width, height,
x0, y0,
bandList);
return (Raster) newRaster;
}
/**
* Creates a Writable subRaster given a region of the Raster. The x and y
* coordinates specify the horizontal and vertical offsets
* from the upper-left corner of this Raster to the upper-left corner
* of the subRaster. A subset of the bands of the parent Raster may
* be specified. If this is null, then all the bands are present in the
* subRaster. A translation to the subRaster may also be specified.
* Note that the subRaster will reference the same
* DataBuffers as the parent Raster, but using different offsets.
* @param x X offset.
* @param y Y offset.
* @param width Width (in pixels) of the subraster.
* @param height Height (in pixels) of the subraster.
* @param x0 Translated X origin of the subraster.
* @param y0 Translated Y origin of the subraster.
* @param bandList Array of band indices.
* @exception RasterFormatException
* if the specified bounding box is outside of the parent Raster.
*/
public WritableRaster createWritableChild(int x, int y,
int width, int height,
int x0, int y0,
int[] bandList) {
if (x < this.minX) {
throw new RasterFormatException("x lies outside the raster");
}
if (y < this.minY) {
throw new RasterFormatException("y lies outside the raster");
}
if ((x+width < x) || (x+width > this.minX + this.width)) {
throw new RasterFormatException("(x + width) is outside of Raster");
}
if ((y+height < y) || (y+height > this.minY + this.height)) {
throw new RasterFormatException("(y + height) is outside of Raster");
}
SampleModel sm;
if (bandList != null)
sm = sampleModel.createSubsetSampleModel(bandList);
else
sm = sampleModel;
int deltaX = x0 - x;
int deltaY = y0 - y;
return new ShortComponentRaster(sm,
dataBuffer,
new Rectangle(x0, y0, width, height),
new Point(sampleModelTranslateX+deltaX,
sampleModelTranslateY+deltaY),
this);
}
/**
* Creates a Raster with the same layout but using a different
* width and height, and with new zeroed data arrays.
*/
public WritableRaster createCompatibleWritableRaster(int w, int h) {
if (w <= 0 || h <=0) {
throw new RasterFormatException("negative "+
((w <= 0) ? "width" : "height"));
}
SampleModel sm = sampleModel.createCompatibleSampleModel(w, h);
return new ShortComponentRaster(sm, new Point(0, 0));
}
/**
* Creates a Raster with the same layout and the same
* width and height, and with new zeroed data arrays. If
* the Raster is a subRaster, this will call
* createCompatibleRaster(width, height).
*/
public WritableRaster createCompatibleWritableRaster() {
return createCompatibleWritableRaster(width,height);
}
/**
* Verify that the layout parameters are consistent with the data.
*
* The method verifies whether scanline stride and pixel stride do not
* cause an integer overflow during calculation of a position of the pixel
* in data buffer. It also verifies whether the data buffer has enough data
* to correspond the raster layout attributes.
*
* @throws RasterFormatException if an integer overflow is detected,
* or if data buffer has not enough capacity.
*/
protected final void verify() {
/* Need to re-verify the dimensions since a sample model may be
* specified to the constructor
*/
if (width <= 0 || height <= 0 ||
height > (Integer.MAX_VALUE / width))
{
throw new RasterFormatException("Invalid raster dimension");
}
for (int i = 0; i < dataOffsets.length; i++) {
if (dataOffsets[i] < 0) {
throw new RasterFormatException("Data offsets for band " + i
+ "(" + dataOffsets[i]
+ ") must be >= 0");
}
}
// we can be sure that width and height are greater than 0
if (scanlineStride < 0 ||
scanlineStride > (Integer.MAX_VALUE / height) ||
scanlineStride > data.length)
{
// integer overflow
throw new RasterFormatException("Incorrect scanline stride: "
+ scanlineStride);
}
int lastScanOffset = (height - 1) * scanlineStride;
if (pixelStride < 0 ||
pixelStride > (Integer.MAX_VALUE / width) ||
pixelStride > data.length)
{
// integer overflow
throw new RasterFormatException("Incorrect pixel stride: "
+ pixelStride);
}
int lastPixelOffset = (width - 1) * pixelStride;
if (lastPixelOffset > (Integer.MAX_VALUE - lastScanOffset)) {
// integer overflow
throw new RasterFormatException("Incorrect raster attributes");
}
lastPixelOffset += lastScanOffset;
int index;
int maxIndex = 0;
for (int i = 0; i < numDataElements; i++) {
if (dataOffsets[i] > (Integer.MAX_VALUE - lastPixelOffset)) {
throw new RasterFormatException("Incorrect band offset: "
+ dataOffsets[i]);
}
index = lastPixelOffset + dataOffsets[i];
if (index > maxIndex) {
maxIndex = index;
}
}
if (data.length <= maxIndex) {
throw new RasterFormatException("Data array too small (should be > "
+ maxIndex + " )");
}
}
public String toString() {
return new String ("ShortComponentRaster: width = "+width
+" height = " + height
+" #numDataElements "+numDataElements);
// +" xOff = "+xOffset+" yOff = "+yOffset);
}
}
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