* For example, 3-3-2 RGB image data can be represented by a * ByteComponentRaster using a SinglePixelPackedSampleModel and * a ComponentColorModel. * */ public class ByteComponentRaster 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 byte[] 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 ByteComponentRaster 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 * SinglePixelPackedSampleModel or ComponentSampleModel. * @param sampleModel The SampleModel that specifies the layout. * @param origin The Point that specified the origin. */ public ByteComponentRaster(SampleModel sampleModel, Point origin) { this(sampleModel, sampleModel.createDataBuffer(), new Rectangle(origin.x, origin.y, sampleModel.getWidth(), sampleModel.getHeight()), origin, null); } /** * Constructs a ByteComponentRaster with the given SampleModel * and DataBuffer. The Raster's upper left corner is origin and * it is the same size as the SampleModel. The DataBuffer is not * initialized and must be a DataBufferByte compatible with SampleModel. * SampleModel must be of type SinglePixelPackedSampleModel * or ComponentSampleModel. * @param sampleModel The SampleModel that specifies the layout. * @param dataBuffer The DataBufferShort that contains the image data. * @param origin The Point that specifies the origin. */ public ByteComponentRaster(SampleModel sampleModel, DataBuffer dataBuffer, Point origin) { this(sampleModel, dataBuffer, new Rectangle(origin.x, origin.y, sampleModel.getWidth(), sampleModel.getHeight()), origin, null); } /** * Constructs a ByteComponentRaster with the given SampleModel, * DataBuffer, and parent. DataBuffer must be a DataBufferByte and * SampleModel must be of type SinglePixelPackedSampleModel * or ComponentSampleModel. * When translated into the base Raster's * coordinate system, aRegion must be contained by the base Raster. * Origin is the coordinate 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 DataBufferShort 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 ByteComponentRaster(SampleModel sampleModel, DataBuffer dataBuffer, Rectangle aRegion, Point origin, ByteComponentRaster parent) { super(sampleModel, dataBuffer, aRegion, origin, parent); this.maxX = minX + width; this.maxY = minY + height; if (!(dataBuffer instanceof DataBufferByte)) { throw new RasterFormatException("ByteComponentRasters must have " + "byte DataBuffers"); } DataBufferByte dbb = (DataBufferByte)dataBuffer; this.data = stealData(dbb, 0); if (dbb.getNumBanks() != 1) { throw new RasterFormatException("DataBuffer for ByteComponentRasters"+ " must only have 1 bank."); } int dbOffset = dbb.getOffset(); if (sampleModel instanceof ComponentSampleModel) { ComponentSampleModel ism = (ComponentSampleModel)sampleModel; this.type = IntegerComponentRaster.TYPE_BYTE_SAMPLES; this.scanlineStride = ism.getScanlineStride(); this.pixelStride = ism.getPixelStride(); this.dataOffsets = ism.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_BYTE_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*pixelStride+yOffset*scanlineStride; } else { throw new RasterFormatException("IntegerComponentRasters 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 sample in the same column of the next row in the * same band. */ 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 byte[] 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!"); } byte outData[]; if (obj == null) { outData = new byte[numDataElements]; } else { outData = (byte[])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. *
* byte[] bandData = (byte[])raster.getDataElements(x, y, w, h, null);
* int numDataElements = raster.getNumDataElements();
* byte[] pixel = new byte[numDataElements];
* // To find a data element at location (x2, y2)
* System.arraycopy(bandData, ((y2-y)*w + (x2-x))*numDataElements,
* pixel, 0, numDataElements);
*
* @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!");
}
byte outData[];
if (obj == null) {
outData = new byte[w*h*numDataElements];
} else {
outData = (byte[])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 byte array of data elements from the specified rectangular
* region for the specified band.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
*
* byte[] bandData = raster.getByteData(x, y, w, h, null);
* // To find the data element at location (x2, y2)
* byte bandElement = bandData[((y2-y)*w + (x2-x))];
*
* @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 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 byte[] getByteData(int x, int y, int w, int h,
int band, byte[] 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 byte[scanlineStride*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 byte 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.
*
* byte[] bandData = raster.getByteData(x, y, w, h, null);
* int numDataElements = raster.getnumDataElements();
* byte[] pixel = new byte[numDataElements];
* // To find a data element at location (x2, y2)
* System.arraycopy(bandData, ((y2-y)*w + (x2-x))*numDataElements,
* pixel, 0, numDataElements);
*
* @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 byte[] getByteData(int x, int y, int w, int h, byte[] 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 byte[numDataElements*scanlineStride*h];
}
int yoff = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
int xoff;
int off = 0;
int xstart;
int ystart;
// REMIND: Should keep track if dataOffsets are in a nice order
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!");
}
byte inData[] = (byte[])obj;
int off = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
for (int i = 0; i < numDataElements; i++) {
data[dataOffsets[i] + off] = 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 = inRaster.getMinX() + x;
int dstOffY = inRaster.getMinY() + y;
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;
}
int srcOffX = inRaster.getMinX();
int srcOffY = inRaster.getMinY();
Object tdata = null;
if (inRaster instanceof ByteComponentRaster) {
ByteComponentRaster bct = (ByteComponentRaster) inRaster;
byte[] bdata = bct.getDataStorage();
// REMIND: Do something faster!
if (numDataElements == 1) {
int toff = bct.getDataOffset(0);
int tss = bct.getScanlineStride();
int srcOffset = toff;
int dstOffset = dataOffsets[0]+(dstY-minY)*scanlineStride+
(dstX-minX);
if (pixelStride == bct.getPixelStride()) {
width *= pixelStride;
for (int tmpY=0; tmpY < height; tmpY++) {
System.arraycopy(bdata, srcOffset,
data, dstOffset, width);
srcOffset += tss;
dstOffset += scanlineStride;
}
markDirty();
return;
}
}
}
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:
*
* inData[((y2-y)*w + (x2-x))*numDataElements + n]
*
* @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!");
}
byte inData[] = (byte[])obj;
int yoff = (y-minY)*scanlineStride +
(x-minX)*pixelStride;
int xoff;
int off = 0;
int xstart;
int ystart;
if (numDataElements == 1) {
int srcOffset = 0;
int dstOffset = yoff + dataOffsets[0];
for (ystart=0; ystart < h; ystart++) {
xoff = yoff;
System.arraycopy(inData, srcOffset,
data, dstOffset, w);
srcOffset += w;
dstOffset += scanlineStride;
}
markDirty();
return;
}
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();
}
/**
* Stores a byte array of data elements into the specified rectangular
* region for the specified band.
* 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:
*
* inData[((y2-y)*w + (x2-x)) + n]
*
* @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 putByteData(int x, int y, int w, int h,
int band, byte[] 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 byte 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:
*
* inData[((y2-y)*w + (x2-x))*numDataElements + n]
*
* @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 putByteData(int x, int y, int w, int h, byte[] 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;
if (numDataElements == 1) {
yoff += dataOffsets[0];
if (pixelStride == 1) {
if (scanlineStride == w) {
System.arraycopy(inData, 0, data, yoff, w*h);
}
else {
for (ystart=0; ystart < h; ystart++) {
System.arraycopy(inData, off, data, yoff, w);
off += w;
yoff += scanlineStride;
}
}
}
else {
for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
xoff = yoff;
for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
data[xoff] = inData[off++];
}
}
}
}
else {
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
* DataBuffer 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
* DataBuffer 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 ByteComponentRaster(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 ByteComponentRaster(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");
}
}
if ((long)minX - sampleModelTranslateX < 0 ||
(long)minY - sampleModelTranslateY < 0) {
throw new RasterFormatException("Incorrect origin/translate: (" +
minX + ", " + minY + ") / (" +
sampleModelTranslateX + ", " + sampleModelTranslateY + ")");
}
// we can be sure that width and height are greater than 0
if (scanlineStride < 0 ||
scanlineStride > (Integer.MAX_VALUE / height))
{
// integer overflow
throw new RasterFormatException("Incorrect scanline stride: "
+ scanlineStride);
}
if (height > 1 || minY - sampleModelTranslateY > 0) {
// buffer should contain at least one scanline
if (scanlineStride > data.length) {
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 ("ByteComponentRaster: width = "+width+" height = "
+ height
+" #numDataElements "+numDataElements
// +" xOff = "+xOffset+" yOff = "+yOffset
+" dataOff[0] = "+dataOffsets[0]);
}
// /**
// * For debugging... prints a region of a one-band ByteComponentRaster
// */
// public void print(int x, int y, int w, int h) {
// // REMIND: Only works for 1 band!
// System.out.println(this);
// int offset = dataOffsets[0] + y*scanlineStride + x*pixelStride;
// int off;
// for (int yoff=0; yoff < h; yoff++, offset += scanlineStride) {
// off = offset;
// System.out.print("Line "+(y+yoff)+": ");
// for (int xoff = 0; xoff < w; xoff++, off+= pixelStride) {
// String s = Integer.toHexString(data[off]);
// if (s.length() == 8) {
// s = s.substring(6,8);
// }
// System.out.print(s+" ");
// }
// System.out.println("");
// }
// }
}