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.
*/
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.MultiPixelPackedSampleModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.Rectangle;
import java.awt.Point;
/**
* This class is useful for describing 1, 2, or 4 bit image data
* elements. This raster has one band whose pixels are packed
* together into individual bytes in a single byte array. This type
* of raster can be used with an IndexColorModel. This raster uses a
* MultiPixelPackedSampleModel.
*
*/
public class BytePackedRaster extends SunWritableRaster {
/** The data bit offset for each pixel. */
int dataBitOffset;
/** Scanline stride of the image data contained in this Raster. */
int scanlineStride;
/**
* The bit stride of a pixel, equal to the total number of bits
* required to store a pixel.
*/
int pixelBitStride;
/** The bit mask for extracting the pixel. */
int bitMask;
/** The image data array. */
byte[] data;
/** 8 minus the pixel bit stride. */
int shiftOffset;
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 BytePackedRaster 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
* MultiPixelPackedSampleModel.
* @param sampleModel The SampleModel that specifies the layout.
* @param origin The Point that specified the origin.
*/
public BytePackedRaster(SampleModel sampleModel,
Point origin) {
this(sampleModel,
sampleModel.createDataBuffer(),
new Rectangle(origin.x,
origin.y,
sampleModel.getWidth(),
sampleModel.getHeight()),
origin,
null);
}
/**
* Constructs a BytePackedRaster 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 MultiPixelPackedSampleModel.
* @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 BytePackedRaster(SampleModel sampleModel,
DataBuffer dataBuffer,
Point origin) {
this(sampleModel,
dataBuffer,
new Rectangle(origin.x,
origin.y,
sampleModel.getWidth(),
sampleModel.getHeight()),
origin,
null);
}
/**
* Constructs a BytePackedRaster with the given SampleModel,
* DataBuffer, and parent. DataBuffer must be a DataBufferByte and
* SampleModel must be of type MultiPixelPackedSampleModel.
* 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.
*
* @exception RasterFormatException if the parameters do not conform
* to requirements of this Raster type.
*/
public BytePackedRaster(SampleModel sampleModel,
DataBuffer dataBuffer,
Rectangle aRegion,
Point origin,
BytePackedRaster parent){
super(sampleModel,dataBuffer,aRegion,origin, parent);
this.maxX = minX + width;
this.maxY = minY + height;
if (!(dataBuffer instanceof DataBufferByte)) {
throw new RasterFormatException("BytePackedRasters must have" +
"byte DataBuffers");
}
DataBufferByte dbb = (DataBufferByte)dataBuffer;
this.data = stealData(dbb, 0);
if (dbb.getNumBanks() != 1) {
throw new
RasterFormatException("DataBuffer for BytePackedRasters"+
" must only have 1 bank.");
}
int dbOffset = dbb.getOffset();
if (sampleModel instanceof MultiPixelPackedSampleModel) {
MultiPixelPackedSampleModel mppsm =
(MultiPixelPackedSampleModel)sampleModel;
this.type = IntegerComponentRaster.TYPE_BYTE_BINARY_SAMPLES;
pixelBitStride = mppsm.getPixelBitStride();
if (pixelBitStride != 1 &&
pixelBitStride != 2 &&
pixelBitStride != 4) {
throw new RasterFormatException
("BytePackedRasters must have a bit depth of 1, 2, or 4");
}
scanlineStride = mppsm.getScanlineStride();
dataBitOffset = mppsm.getDataBitOffset() + dbOffset*8;
int xOffset = aRegion.x - origin.x;
int yOffset = aRegion.y - origin.y;
dataBitOffset += xOffset*pixelBitStride + yOffset*scanlineStride*8;
bitMask = (1 << pixelBitStride) -1;
shiftOffset = 8 - pixelBitStride;
} else {
throw new RasterFormatException("BytePackedRasters must have"+
"MultiPixelPackedSampleModel");
}
verify(false);
}
/**
* Returns the data bit offset for the Raster. The data
* bit offset is the bit index into the data array element
* corresponding to the first sample of the first scanline.
*/
public int getDataBitOffset() {
return dataBitOffset;
}
/**
* 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 bit stride -- the number of bits between two
* samples on the same scanline.
*/
public int getPixelBitStride() {
return pixelBitStride;
}
/**
* Returns a reference to the entire data array.
*/
public byte[] getDataStorage() {
return data;
}
/**
* Returns the data element 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 bitnum = dataBitOffset + (x-minX) * pixelBitStride;
// Fix 4184283
int element = data[(y-minY) * scanlineStride + (bitnum >> 3)] & 0xff;
int shift = shiftOffset - (bitnum & 7);
outData[0] = (byte)((element >> shift) & bitMask);
return outData;
}
/**
* Returns the pixel data for the specified rectangle of pixels in a
* primitive array of type TransferType.
* For image data supported by the Java 2D API, this
* will be one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or
* DataBuffer.TYPE_INT. Data may be returned in a packed format,
* thus increasing efficiency for data transfers.
*
* An ArrayIndexOutOfBoundsException may be thrown
* if the coordinates are not in bounds.
* A ClassCastException will be thrown if the input object is non null
* and references anything other than an array of TransferType.
* @see java.awt.image.SampleModel#getDataElements(int, int, int, int, Object, DataBuffer)
* @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 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 requested pixel data.
*/
public Object getDataElements(int x, int y, int w, int h,
Object outData) {
return getByteData(x, y, w, h, (byte[])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>
* byte[] bandData = (byte[])raster.getPixelData(x, y, w, h, null);
* int pixel;
* // To find a data element at location (x2, y2)
* pixel = 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 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 getPixelData(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[numDataElements*w*h];
} else {
outData = (byte[])obj;
}
int pixbits = pixelBitStride;
int scanbit = dataBitOffset + (x-minX) * pixbits;
int index = (y-minY) * scanlineStride;
int outindex = 0;
byte data[] = this.data;
for (int j = 0; j < h; j++) {
int bitnum = scanbit;
for (int i = 0; i < w; i++) {
int shift = shiftOffset - (bitnum & 7);
outData[outindex++] =
(byte)(bitMask & (data[index + (bitnum >> 3)] >> shift));
bitnum += pixbits;
}
index += scanlineStride;
}
return outData;
}
/**
* Returns a byte array containing the specified data elements
* from the data array. The band index will be ignored.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* <pre>
* byte[] byteData = getByteData(x, y, band, w, h, null);
* // To find a data element at location (x2, y2)
* byte element = byteData[(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 pixel rectangle.
* @param height Height of the pixel rectangle.
* @param band The band to return, is ignored.
* @param outData If non-null, data elements
* at the specified locations are returned in this array.
* @return Byte array with data elements.
*/
public byte[] getByteData(int x, int y, int w, int h,
int band, byte[] outData) {
return getByteData(x, y, w, h, outData);
}
/**
* Returns a byte array containing the specified data elements
* from the data array.
* An ArrayIndexOutOfBounds exception will be thrown at runtime
* if the pixel coordinates are out of bounds.
* <pre>
* byte[] byteData = raster.getByteData(x, y, w, h, null);
* byte pixel;
* // To find a data element at location (x2, y2)
* pixel = byteData[((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 pixel rectangle.
* @param height Height of the pixel rectangle.
* @param outData If non-null, data elements
* at the specified locations are returned in this array.
* @return Byte array with data elements.
*/
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[w * h];
}
int pixbits = pixelBitStride;
int scanbit = dataBitOffset + (x-minX) * pixbits;
int index = (y-minY) * scanlineStride;
int outindex = 0;
byte data[] = this.data;
for (int j = 0; j < h; j++) {
int bitnum = scanbit;
int element;
// Process initial portion of scanline
int i = 0;
while ((i < w) && ((bitnum & 7) != 0)) {
int shift = shiftOffset - (bitnum & 7);
outData[outindex++] =
(byte)(bitMask & (data[index + (bitnum >> 3)] >> shift));
bitnum += pixbits;
i++;
}
// Process central portion of scanline 8 pixels at a time
int inIndex = index + (bitnum >> 3);
switch (pixbits) {
case 1:
for (; i < w - 7; i += 8) {
element = data[inIndex++];
outData[outindex++] = (byte)((element >> 7) & 1);
outData[outindex++] = (byte)((element >> 6) & 1);
outData[outindex++] = (byte)((element >> 5) & 1);
outData[outindex++] = (byte)((element >> 4) & 1);
outData[outindex++] = (byte)((element >> 3) & 1);
outData[outindex++] = (byte)((element >> 2) & 1);
outData[outindex++] = (byte)((element >> 1) & 1);
outData[outindex++] = (byte)(element & 1);
bitnum += 8;
}
break;
case 2:
for (; i < w - 7; i += 8) {
element = data[inIndex++];
outData[outindex++] = (byte)((element >> 6) & 3);
outData[outindex++] = (byte)((element >> 4) & 3);
outData[outindex++] = (byte)((element >> 2) & 3);
outData[outindex++] = (byte)(element & 3);
element = data[inIndex++];
outData[outindex++] = (byte)((element >> 6) & 3);
outData[outindex++] = (byte)((element >> 4) & 3);
outData[outindex++] = (byte)((element >> 2) & 3);
outData[outindex++] = (byte)(element & 3);
bitnum += 16;
}
break;
case 4:
for (; i < w - 7; i += 8) {
element = data[inIndex++];
outData[outindex++] = (byte)((element >> 4) & 0xf);
outData[outindex++] = (byte)(element & 0xf);
element = data[inIndex++];
outData[outindex++] = (byte)((element >> 4) & 0xf);
outData[outindex++] = (byte)(element & 0xf);
element = data[inIndex++];
outData[outindex++] = (byte)((element >> 4) & 0xf);
outData[outindex++] = (byte)(element & 0xf);
element = data[inIndex++];
outData[outindex++] = (byte)((element >> 4) & 0xf);
outData[outindex++] = (byte)(element & 0xf);
bitnum += 32;
}
break;
}
// Process final portion of scanline
for (; i < w; i++) {
int shift = shiftOffset - (bitnum & 7);
outData[outindex++] =
(byte) (bitMask & (data[index + (bitnum >> 3)] >> shift));
bitnum += pixbits;
}
index += scanlineStride;
}
return outData;
}
/**
* Stores the data elements 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 bitnum = dataBitOffset + (x-minX) * pixelBitStride;
int index = (y-minY) * scanlineStride + (bitnum >> 3);
int shift = shiftOffset - (bitnum & 7);
byte element = data[index];
element &= ~(bitMask << shift);
element |= (inData[0] & bitMask) << shift;
data[index] = element;
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) {
// Check if we can use fast code
if (!(inRaster instanceof BytePackedRaster) ||
((BytePackedRaster)inRaster).pixelBitStride != pixelBitStride) {
super.setDataElements(x, y, inRaster);
return;
}
int srcOffX = inRaster.getMinX();
int srcOffY = inRaster.getMinY();
int dstOffX = srcOffX + x;
int dstOffY = srcOffY + 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,
srcOffX, srcOffY,
width, height,
(BytePackedRaster)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 srcX The absolute X coordinate of the upper-left source
* pixel that will be copied into this Raster
* @param srcY The absolute Y coordinate of the upper-left source
* pixel that will be copied into this Raster
* @param width The number of pixels to store horizontally
* @param height The number of pixels to store vertically
* @param inRaster BytePackedRaster of data to place at x,y location.
*/
private void setDataElements(int dstX, int dstY,
int srcX, int srcY,
int width, int height,
BytePackedRaster inRaster) {
// Assume bounds checking has been performed previously
if (width <= 0 || height <= 0) {
return;
}
byte[] inData = inRaster.data;
byte[] outData = this.data;
int inscan = inRaster.scanlineStride;
int outscan = this.scanlineStride;
int inbit = inRaster.dataBitOffset +
8 * (srcY - inRaster.minY) * inscan +
(srcX - inRaster.minX) * inRaster.pixelBitStride;
int outbit = (this.dataBitOffset +
8 * (dstY - minY) * outscan +
(dstX - minX) * this.pixelBitStride);
int copybits = width * pixelBitStride;
// Check whether the same bit alignment is present in both
// Rasters; if so, we can copy whole bytes using
// System.arraycopy. If not, we must do a "funnel shift"
// where adjacent bytes contribute to each destination byte.
if ((inbit & 7) == (outbit & 7)) {
// copy is bit aligned
int bitpos = outbit & 7;
if (bitpos != 0) {
int bits = 8 - bitpos;
// Copy partial bytes on left
int inbyte = inbit >> 3;
int outbyte = outbit >> 3;
int mask = 0xff >> bitpos;
if (copybits < bits) {
// Fix bug 4399076: previously had '8 - copybits' instead
// of 'bits - copybits'.
//
// Prior to the this expression, 'mask' has its rightmost
// 'bits' bits set to '1'. We want it to have a total
// of 'copybits' bits set, therefore we want to introduce
// 'bits - copybits' zeroes on the right.
mask &= 0xff << (bits - copybits);
bits = copybits;
}
for (int j = 0; j < height; j++) {
int element = outData[outbyte];
element &= ~mask;
element |= (inData[inbyte] & mask);
outData[outbyte] = (byte) element;
inbyte += inscan;
outbyte += outscan;
}
inbit += bits;
outbit += bits;
copybits -= bits;
}
if (copybits >= 8) {
// Copy whole bytes
int inbyte = inbit >> 3;
int outbyte = outbit >> 3;
int copybytes = copybits >> 3;
if (copybytes == inscan && inscan == outscan) {
System.arraycopy(inData, inbyte,
outData, outbyte,
inscan * height);
} else {
for (int j = 0; j < height; j++) {
System.arraycopy(inData, inbyte,
outData, outbyte,
copybytes);
inbyte += inscan;
outbyte += outscan;
}
}
int bits = copybytes*8;
inbit += bits;
outbit += bits;
copybits -= bits;
}
if (copybits > 0) {
// Copy partial bytes on right
int inbyte = inbit >> 3;
int outbyte = outbit >> 3;
int mask = (0xff00 >> copybits) & 0xff;
for (int j = 0; j < height; j++) {
int element = outData[outbyte];
element &= ~mask;
element |= (inData[inbyte] & mask);
outData[outbyte] = (byte) element;
inbyte += inscan;
outbyte += outscan;
}
}
} else {
// Unaligned case, see RFE #4284166
// Note that the code in that RFE is not correct
// Insert bits into the first byte of the output
// if either the starting bit position is not zero or
// we are writing fewer than 8 bits in total
int bitpos = outbit & 7;
if (bitpos != 0 || copybits < 8) {
int bits = 8 - bitpos;
int inbyte = inbit >> 3;
int outbyte = outbit >> 3;
int lshift = inbit & 7;
int rshift = 8 - lshift;
int mask = 0xff >> bitpos;
if (copybits < bits) {
// Fix mask if we're only writing a partial byte
mask &= 0xff << (bits - copybits);
bits = copybits;
}
int lastByte = inData.length - 1;
for (int j = 0; j < height; j++) {
// Read two bytes from the source if possible
// Don't worry about going over a scanline boundary
// since any extra bits won't get used anyway
byte inData0 = inData[inbyte];
byte inData1 = (byte)0;
if (inbyte < lastByte) {
inData1 = inData[inbyte + 1];
}
// Insert the new bits into the output
int element = outData[outbyte];
element &= ~mask;
element |= (((inData0 << lshift) |
((inData1 & 0xff) >> rshift))
>> bitpos) & mask;
outData[outbyte] = (byte)element;
inbyte += inscan;
outbyte += outscan;
}
inbit += bits;
outbit += bits;
copybits -= bits;
}
// Now we have outbit & 7 == 0 so we can write
// complete bytes for a while
// Make sure we have work to do in the central loop
// to avoid reading past the end of the scanline
if (copybits >= 8) {
int inbyte = inbit >> 3;
int outbyte = outbit >> 3;
int copybytes = copybits >> 3;
int lshift = inbit & 7;
int rshift = 8 - lshift;
for (int j = 0; j < height; j++) {
int ibyte = inbyte + j*inscan;
int obyte = outbyte + j*outscan;
int inData0 = inData[ibyte];
// Combine adjacent bytes while 8 or more bits left
for (int i = 0; i < copybytes; i++) {
int inData1 = inData[ibyte + 1];
int val = (inData0 << lshift) |
((inData1 & 0xff) >> rshift);
outData[obyte] = (byte)val;
inData0 = inData1;
++ibyte;
++obyte;
}
}
int bits = copybytes*8;
inbit += bits;
outbit += bits;
copybits -= bits;
}
// Finish last byte
if (copybits > 0) {
int inbyte = inbit >> 3;
int outbyte = outbit >> 3;
int mask = (0xff00 >> copybits) & 0xff;
int lshift = inbit & 7;
int rshift = 8 - lshift;
int lastByte = inData.length - 1;
for (int j = 0; j < height; j++) {
byte inData0 = inData[inbyte];
byte inData1 = (byte)0;
if (inbyte < lastByte) {
inData1 = inData[inbyte + 1];
}
// Insert the new bits into the output
int element = outData[outbyte];
element &= ~mask;
element |= ((inData0 << lshift) |
((inData1 & 0xff) >> rshift)) & mask;
outData[outbyte] = (byte)element;
inbyte += inscan;
outbyte += outscan;
}
}
}
markDirty();
}
/**
* Copies pixels from Raster srcRaster to this WritableRaster.
* For each (x, y) address in srcRaster, the corresponding pixel
* is copied to address (x+dx, y+dy) in this WritableRaster,
* unless (x+dx, y+dy) falls outside the bounds of this raster.
* srcRaster must have the same number of bands as this WritableRaster.
* The copy is a simple copy of source samples to the corresponding
* destination samples. For details, see
* {@link WritableRaster#setRect(Raster)}.
*
* @param dx The X translation factor from src space to dst space
* of the copy.
* @param dy The Y translation factor from src space to dst space
* of the copy.
* @param srcRaster The Raster from which to copy pixels.
*/
public void setRect(int dx, int dy, Raster srcRaster) {
// Check if we can use fast code
if (!(srcRaster instanceof BytePackedRaster) ||
((BytePackedRaster)srcRaster).pixelBitStride != pixelBitStride) {
super.setRect(dx, dy, srcRaster);
return;
}
int width = srcRaster.getWidth();
int height = srcRaster.getHeight();
int srcOffX = srcRaster.getMinX();
int srcOffY = srcRaster.getMinY();
int dstOffX = dx+srcOffX;
int dstOffY = dy+srcOffY;
// Clip to this raster
if (dstOffX < this.minX) {
int skipX = this.minX - dstOffX;
width -= skipX;
srcOffX += skipX;
dstOffX = this.minX;
}
if (dstOffY < this.minY) {
int skipY = this.minY - dstOffY;
height -= skipY;
srcOffY += skipY;
dstOffY = this.minY;
}
if (dstOffX+width > this.maxX) {
width = this.maxX - dstOffX;
}
if (dstOffY+height > this.maxY) {
height = this.maxY - dstOffY;
}
setDataElements(dstOffX, dstOffY,
srcOffX, srcOffY,
width, height,
(BytePackedRaster)srcRaster);
}
/**
* 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
* 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 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) {
putByteData(x, y, w, h, (byte[])obj);
}
/**
* Stores a byte array of data elements into the specified rectangular
* region. The band index will be ignored.
* 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, is ignored.
* @param inData The data elements to be stored.
*/
public void putByteData(int x, int y, int w, int h,
int band, byte[] inData) {
putByteData(x, y, w, h, inData);
}
/**
* 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
* 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 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!");
}
if (w == 0 || h == 0) {
return;
}
int pixbits = pixelBitStride;
int scanbit = dataBitOffset + (x - minX) * pixbits;
int index = (y - minY) * scanlineStride;
int outindex = 0;
byte data[] = this.data;
for (int j = 0; j < h; j++) {
int bitnum = scanbit;
int element;
// Process initial portion of scanline
int i = 0;
while ((i < w) && ((bitnum & 7) != 0)) {
int shift = shiftOffset - (bitnum & 7);
element = data[index + (bitnum >> 3)];
element &= ~(bitMask << shift);
element |= (inData[outindex++] & bitMask) << shift;
data[index + (bitnum >> 3)] = (byte)element;
bitnum += pixbits;
i++;
}
// Process central portion of scanline 8 pixels at a time
int inIndex = index + (bitnum >> 3);
switch (pixbits) {
case 1:
for (; i < w - 7; i += 8) {
element = (inData[outindex++] & 1) << 7;
element |= (inData[outindex++] & 1) << 6;
element |= (inData[outindex++] & 1) << 5;
element |= (inData[outindex++] & 1) << 4;
element |= (inData[outindex++] & 1) << 3;
element |= (inData[outindex++] & 1) << 2;
element |= (inData[outindex++] & 1) << 1;
element |= (inData[outindex++] & 1);
data[inIndex++] = (byte)element;
bitnum += 8;
}
break;
case 2:
for (; i < w - 7; i += 8) {
element = (inData[outindex++] & 3) << 6;
element |= (inData[outindex++] & 3) << 4;
element |= (inData[outindex++] & 3) << 2;
element |= (inData[outindex++] & 3);
data[inIndex++] = (byte)element;
element = (inData[outindex++] & 3) << 6;
element |= (inData[outindex++] & 3) << 4;
element |= (inData[outindex++] & 3) << 2;
element |= (inData[outindex++] & 3);
data[inIndex++] = (byte)element;
bitnum += 16;
}
break;
case 4:
for (; i < w - 7; i += 8) {
element = (inData[outindex++] & 0xf) << 4;
element |= (inData[outindex++] & 0xf);
data[inIndex++] = (byte)element;
element = (inData[outindex++] & 0xf) << 4;
element |= (inData[outindex++] & 0xf);
data[inIndex++] = (byte)element;
element = (inData[outindex++] & 0xf) << 4;
element |= (inData[outindex++] & 0xf);
data[inIndex++] = (byte)element;
element = (inData[outindex++] & 0xf) << 4;
element |= (inData[outindex++] & 0xf);
data[inIndex++] = (byte)element;
bitnum += 32;
}
break;
}
// Process final portion of scanline
for (; i < w; i++) {
int shift = shiftOffset - (bitnum & 7);
element = data[index + (bitnum >> 3)];
element &= ~(bitMask << shift);
element |= (inData[outindex++] & bitMask) << shift;
data[index + (bitnum >> 3)] = (byte)element;
bitnum += pixbits;
}
index += scanlineStride;
}
markDirty();
}
/**
* Returns an int array containing all samples for a rectangle of pixels,
* one sample per array element.
* An ArrayIndexOutOfBoundsException may be thrown
* if the coordinates are not in bounds.
* @param x, y the coordinates of the upper-left pixel location
* @param w Width of the pixel rectangle
* @param h Height of the pixel rectangle
* @param iArray An optionally pre-allocated int array
* @return the samples for the specified rectangle of pixels.
*/
public int[] getPixels(int x, int y, int w, int h, int iArray[]) {
if ((x < this.minX) || (y < this.minY) ||
(x + w > this.maxX) || (y + h > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
if (iArray == null) {
iArray = new int[w * h];
}
int pixbits = pixelBitStride;
int scanbit = dataBitOffset + (x-minX) * pixbits;
int index = (y-minY) * scanlineStride;
int outindex = 0;
byte data[] = this.data;
for (int j = 0; j < h; j++) {
int bitnum = scanbit;
int element;
// Process initial portion of scanline
int i = 0;
while ((i < w) && ((bitnum & 7) != 0)) {
int shift = shiftOffset - (bitnum & 7);
iArray[outindex++] =
bitMask & (data[index + (bitnum >> 3)] >> shift);
bitnum += pixbits;
i++;
}
// Process central portion of scanline 8 pixels at a time
int inIndex = index + (bitnum >> 3);
switch (pixbits) {
case 1:
for (; i < w - 7; i += 8) {
element = data[inIndex++];
iArray[outindex++] = (element >> 7) & 1;
iArray[outindex++] = (element >> 6) & 1;
iArray[outindex++] = (element >> 5) & 1;
iArray[outindex++] = (element >> 4) & 1;
iArray[outindex++] = (element >> 3) & 1;
iArray[outindex++] = (element >> 2) & 1;
iArray[outindex++] = (element >> 1) & 1;
iArray[outindex++] = element & 1;
bitnum += 8;
}
break;
case 2:
for (; i < w - 7; i += 8) {
element = data[inIndex++];
iArray[outindex++] = (element >> 6) & 3;
iArray[outindex++] = (element >> 4) & 3;
iArray[outindex++] = (element >> 2) & 3;
iArray[outindex++] = element & 3;
element = data[inIndex++];
iArray[outindex++] = (element >> 6) & 3;
iArray[outindex++] = (element >> 4) & 3;
iArray[outindex++] = (element >> 2) & 3;
iArray[outindex++] = element & 3;
bitnum += 16;
}
break;
case 4:
for (; i < w - 7; i += 8) {
element = data[inIndex++];
iArray[outindex++] = (element >> 4) & 0xf;
iArray[outindex++] = element & 0xf;
element = data[inIndex++];
iArray[outindex++] = (element >> 4) & 0xf;
iArray[outindex++] = element & 0xf;
element = data[inIndex++];
iArray[outindex++] = (element >> 4) & 0xf;
iArray[outindex++] = element & 0xf;
element = data[inIndex++];
iArray[outindex++] = (element >> 4) & 0xf;
iArray[outindex++] = element & 0xf;
bitnum += 32;
}
break;
}
// Process final portion of scanline
for (; i < w; i++) {
int shift = shiftOffset - (bitnum & 7);
iArray[outindex++] =
bitMask & (data[index + (bitnum >> 3)] >> shift);
bitnum += pixbits;
}
index += scanlineStride;
}
return iArray;
}
/**
* Sets all samples for a rectangle of pixels from an int array containing
* one sample per array element.
* An ArrayIndexOutOfBoundsException may be thrown if the coordinates are
* not in bounds.
* @param x The X coordinate of the upper left pixel location.
* @param y The Y coordinate of the upper left pixel location.
* @param w Width of the pixel rectangle.
* @param h Height of the pixel rectangle.
* @param iArray The input int pixel array.
*/
public void setPixels(int x, int y, int w, int h, int iArray[]) {
if ((x < this.minX) || (y < this.minY) ||
(x + w > this.maxX) || (y + h > this.maxY)) {
throw new ArrayIndexOutOfBoundsException
("Coordinate out of bounds!");
}
int pixbits = pixelBitStride;
int scanbit = dataBitOffset + (x - minX) * pixbits;
int index = (y - minY) * scanlineStride;
int outindex = 0;
byte data[] = this.data;
for (int j = 0; j < h; j++) {
int bitnum = scanbit;
int element;
// Process initial portion of scanline
int i = 0;
while ((i < w) && ((bitnum & 7) != 0)) {
int shift = shiftOffset - (bitnum & 7);
element = data[index + (bitnum >> 3)];
element &= ~(bitMask << shift);
element |= (iArray[outindex++] & bitMask) << shift;
data[index + (bitnum >> 3)] = (byte)element;
bitnum += pixbits;
i++;
}
// Process central portion of scanline 8 pixels at a time
int inIndex = index + (bitnum >> 3);
switch (pixbits) {
case 1:
for (; i < w - 7; i += 8) {
element = (iArray[outindex++] & 1) << 7;
element |= (iArray[outindex++] & 1) << 6;
element |= (iArray[outindex++] & 1) << 5;
element |= (iArray[outindex++] & 1) << 4;
element |= (iArray[outindex++] & 1) << 3;
element |= (iArray[outindex++] & 1) << 2;
element |= (iArray[outindex++] & 1) << 1;
element |= (iArray[outindex++] & 1);
data[inIndex++] = (byte)element;
bitnum += 8;
}
break;
case 2:
for (; i < w - 7; i += 8) {
element = (iArray[outindex++] & 3) << 6;
element |= (iArray[outindex++] & 3) << 4;
element |= (iArray[outindex++] & 3) << 2;
element |= (iArray[outindex++] & 3);
data[inIndex++] = (byte)element;
element = (iArray[outindex++] & 3) << 6;
element |= (iArray[outindex++] & 3) << 4;
element |= (iArray[outindex++] & 3) << 2;
element |= (iArray[outindex++] & 3);
data[inIndex++] = (byte)element;
bitnum += 16;
}
break;
case 4:
for (; i < w - 7; i += 8) {
element = (iArray[outindex++] & 0xf) << 4;
element |= (iArray[outindex++] & 0xf);
data[inIndex++] = (byte)element;
element = (iArray[outindex++] & 0xf) << 4;
element |= (iArray[outindex++] & 0xf);
data[inIndex++] = (byte)element;
element = (iArray[outindex++] & 0xf) << 4;
element |= (iArray[outindex++] & 0xf);
data[inIndex++] = (byte)element;
element = (iArray[outindex++] & 0xf) << 4;
element |= (iArray[outindex++] & 0xf);
data[inIndex++] = (byte)element;
bitnum += 32;
}
break;
}
// Process final portion of scanline
for (; i < w; i++) {
int shift = shiftOffset - (bitnum & 7);
element = data[index + (bitnum >> 3)];
element &= ~(bitMask << shift);
element |= (iArray[outindex++] & bitMask) << shift;
data[index + (bitnum >> 3)] = (byte)element;
bitnum += pixbits;
}
index += scanlineStride;
}
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. Note that the subraster will reference the same
* DataBuffer as the parent raster, but using different offsets. The
* bandList is ignored.
* @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. The bandList is ignored.
* 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.
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