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
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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.SinglePixelPackedSampleModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferInt;
import java.awt.Rectangle;
import java.awt.Point;
/**
* This class defines a Raster with pixels consisting of one or more 32-bit
* data elements stored in close proximity to each other in a integer array.
* The bit precision per data element is that
* of the data type (that is, the bit precision for this raster is 32).
* There is only one pixel stride and one scanline stride for all
* bands. For a given pixel, all samples fit in N data elements and these
* N data elements hold samples for only one pixel. This type of Raster
* can be used with a PackedColorModel.
* <p>
* For example, if there is only one data element per pixel, a
* SinglePixelPackedSampleModel can be used to represent multiple
* bands with a PackedColorModel (including a DirectColorModel) for
* color interpretation.
*
*/
public class IntegerComponentRaster extends SunWritableRaster {
static final int TYPE_CUSTOM = 0;
static final int TYPE_BYTE_SAMPLES = 1;
static final int TYPE_USHORT_SAMPLES = 2;
static final int TYPE_INT_SAMPLES = 3;
static final int TYPE_BYTE_BANDED_SAMPLES = 4;
static final int TYPE_USHORT_BANDED_SAMPLES = 5;
static final int TYPE_INT_BANDED_SAMPLES = 6;
static final int TYPE_BYTE_PACKED_SAMPLES = 7;
static final int TYPE_USHORT_PACKED_SAMPLES = 8;
static final int TYPE_INT_PACKED_SAMPLES = 9;
static final int TYPE_INT_8BIT_SAMPLES = 10;
static final int TYPE_BYTE_BINARY_SAMPLES = 11;
/** 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 int[] data;
/** The number of data elements required to store a pixel. */
protected int numDataElems;
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 IntegerComponentRaster 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.
* @param sampleModel The SampleModel that specifies the layout.
* @param origin The Point that specified the origin.
*/
public IntegerComponentRaster(SampleModel sampleModel,
Point origin) {
this(sampleModel,
sampleModel.createDataBuffer(),
new Rectangle(origin.x,
origin.y,
sampleModel.getWidth(),
sampleModel.getHeight()),
origin,
null);
}
/**
* Constructs a IntegerComponentRaster 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 DataBufferInt compatible with SampleModel.
* SampleModel must be of type SinglePixelPackedSampleModel.
* @param sampleModel The SampleModel that specifies the layout.
* @param dataBuffer The DataBufferInt that contains the image data.
* @param origin The Point that specifies the origin.
*/
public IntegerComponentRaster(SampleModel sampleModel,
DataBuffer dataBuffer,
Point origin) {
this(sampleModel,
dataBuffer,
new Rectangle(origin.x,
origin.y,
sampleModel.getWidth(),
sampleModel.getHeight()),
origin,
null);
}
/**
* Constructs a IntegerComponentRaster with the given SampleModel,
* DataBuffer, and parent. DataBuffer must be a DataBufferInt and
* SampleModel must be of type 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 DataBufferInt 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 IntegerComponentRaster(SampleModel sampleModel,
DataBuffer dataBuffer,
Rectangle aRegion,
Point origin,
IntegerComponentRaster parent){
super(sampleModel,dataBuffer,aRegion,origin,parent);
this.maxX = minX + width;
this.maxY = minY + height;
if (!(dataBuffer instanceof DataBufferInt)) {
throw new RasterFormatException("IntegerComponentRasters must have" +
"integer DataBuffers");
}
DataBufferInt dbi = (DataBufferInt)dataBuffer;
if (dbi.getNumBanks() != 1) {
throw new
RasterFormatException("DataBuffer for IntegerComponentRasters"+
" must only have 1 bank.");
}
this.data = stealData(dbi, 0);
if (sampleModel instanceof SinglePixelPackedSampleModel) {
SinglePixelPackedSampleModel sppsm =
(SinglePixelPackedSampleModel)sampleModel;
int[] boffsets = sppsm.getBitOffsets();
boolean notByteBoundary = false;
for (int i=1; i < boffsets.length; i++) {
if ((boffsets[i]%8) != 0) {
notByteBoundary = true;
}
}
this.type = (notByteBoundary
? IntegerComponentRaster.TYPE_INT_PACKED_SAMPLES
: IntegerComponentRaster.TYPE_INT_8BIT_SAMPLES);
this.scanlineStride = sppsm.getScanlineStride();
this.pixelStride = 1;
this.dataOffsets = new int[1];
this.dataOffsets[0] = dbi.getOffset();
this.bandOffset = this.dataOffsets[0];
int xOffset = aRegion.x - origin.x;
int yOffset = aRegion.y - origin.y;
dataOffsets[0] += xOffset+yOffset*scanlineStride;
this.numDataElems = sppsm.getNumDataElements();
} else {
throw new RasterFormatException("IntegerComponentRasters must have"+
" SinglePixelPackedSampleModel");
}
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 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.
*/
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.
*/
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 int[] 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!");
}
int outData[];
if (obj == null) {
outData = new int[numDataElements];
} else {
outData = (int[])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>
* int[] bandData = (int[])raster.getDataElements(x, y, w, h, null);
* int numDataElements = raster.getNumDataElements();
* int[] pixel = new int[numDataElements];
* // To find a 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!");
}
int outData[];
if (obj instanceof int[]) {
outData = (int[])obj;
} else {
outData = new int[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!");
}
int inData[] = (int[])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.
* The transferType of the inputRaster must match this raster.
* An ArrayIndexOutOfBoundsException 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();
int tdata[] = null;
if (inRaster instanceof IntegerComponentRaster &&
(pixelStride == 1) && (numDataElements == 1)) {
IntegerComponentRaster ict = (IntegerComponentRaster) inRaster;
if (ict.getNumDataElements() != 1) {
throw new ArrayIndexOutOfBoundsException("Number of bands"+
" does not match");
}
// Extract the raster parameters
tdata = ict.getDataStorage();
int tss = ict.getScanlineStride();
int toff = ict.getDataOffset(0);
int srcOffset = toff;
int dstOffset = dataOffsets[0]+(dstY-minY)*scanlineStride+
(dstX-minX);
// Fastest case. We can copy scanlines
if (ict.getPixelStride() == pixelStride) {
width *= pixelStride;
// Loop through all of the scanlines and copy the data
for (int startY=0; startY < height; startY++) {
System.arraycopy(tdata, srcOffset, data, dstOffset, width);
srcOffset += tss;
dstOffset += scanlineStride;
}
markDirty();
return;
}
}
Object odata = null;
for (int startY=0; startY < height; startY++) {
odata = inRaster.getDataElements(srcOffX, srcOffY+startY,
width, 1, odata);
setDataElements(dstX, dstY+startY,
width, 1, odata);
}
}
/**
* 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!");
}
int inData[] = (int[])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] = 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 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 raster");
}
if (y < this.minY) {
throw new RasterFormatException("y lies outside raster");
}
if ((x+width < x) || (x+width > this.minX + this.width)) {
throw new RasterFormatException("(x + width) is outside raster");
}
if ((y+height < y) || (y+height > this.minY + this.height)) {
throw new RasterFormatException("(y + height) is outside raster");
}
SampleModel sm;
if (bandList != null)
sm = sampleModel.createSubsetSampleModel(bandList);
else
sm = sampleModel;
int deltaX = x0 - x;
int deltaY = y0 - y;
return new IntegerComponentRaster(sm,
dataBuffer,
new Rectangle(x0,y0,width,height),
new Point(sampleModelTranslateX+deltaX,
sampleModelTranslateY+deltaY),
this);
}
/**
* 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. 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[]) {
return createWritableChild(x, y, width, height, x0, y0, bandList);
}
/**
* Creates a raster with the same band 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 IntegerComponentRaster(sm, new Point(0,0));
}
/**
* Creates a raster with the same data 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");
}
if (dataOffsets[0] < 0) {
throw new RasterFormatException("Data offset ("+dataOffsets[0]+
") must be >= 0");
}
if ((long)minX - sampleModelTranslateX < 0 ||
(long)minY - sampleModelTranslateY < 0) {
throw new RasterFormatException("Incorrect origin/translate: (" +
minX + ", " + minY + ") / (" +
sampleModelTranslateX + ", " + sampleModelTranslateY + ")");
}
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