JDK14/Java14源码在线阅读
JDK14/Java14源码在线阅读 /
java.desktop /
share /
classes /
com /
sun /
imageio /
plugins /
bmp /
BMPImageReader.java
/*
* Copyright (c) 2003, 2018, 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 com.sun.imageio.plugins.bmp;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.color.ICC_ColorSpace;
import java.awt.color.ICC_Profile;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.ComponentSampleModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.DataBufferInt;
import java.awt.image.DataBufferUShort;
import java.awt.image.DirectColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.MultiPixelPackedSampleModel;
import java.awt.image.PixelInterleavedSampleModel;
import java.awt.image.Raster;
import java.awt.image.SampleModel;
import java.awt.image.SinglePixelPackedSampleModel;
import java.awt.image.WritableRaster;
import javax.imageio.IIOException;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.event.IIOReadProgressListener;
import javax.imageio.event.IIOReadUpdateListener;
import javax.imageio.event.IIOReadWarningListener;
import java.io.*;
import java.nio.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.StringTokenizer;
import com.sun.imageio.plugins.common.ImageUtil;
import com.sun.imageio.plugins.common.I18N;
/** This class is the Java Image IO plugin reader for BMP images.
* It may subsample the image, clip the image, select sub-bands,
* and shift the decoded image origin if the proper decoding parameter
* are set in the provided {@code ImageReadParam}.
*
* This class supports Microsoft Windows Bitmap Version 3-5,
* as well as OS/2 Bitmap Version 2.x (for single-image BMP file).
* It also supports undocumented DIB header of type BITMAPV2INFOHEADER
* & BITMAPV3INFOHEADER.
*/
public class BMPImageReader extends ImageReader implements BMPConstants {
// BMP Image types
private static final int VERSION_2_1_BIT = 0;
private static final int VERSION_2_4_BIT = 1;
private static final int VERSION_2_8_BIT = 2;
private static final int VERSION_2_24_BIT = 3;
private static final int VERSION_3_1_BIT = 4;
private static final int VERSION_3_4_BIT = 5;
private static final int VERSION_3_8_BIT = 6;
private static final int VERSION_3_24_BIT = 7;
private static final int VERSION_3_NT_16_BIT = 8;
private static final int VERSION_3_NT_32_BIT = 9;
// All VERSION_3_EXT_* are for BITMAPV2INFOHEADER & BITMAPV3INFOHEADER
private static final int VERSION_3_EXT_1_BIT = 10;
private static final int VERSION_3_EXT_4_BIT = 11;
private static final int VERSION_3_EXT_8_BIT = 12;
private static final int VERSION_3_EXT_16_BIT = 13;
private static final int VERSION_3_EXT_24_BIT = 14;
private static final int VERSION_3_EXT_32_BIT = 15;
private static final int VERSION_4_1_BIT = 16;
private static final int VERSION_4_4_BIT = 17;
private static final int VERSION_4_8_BIT = 18;
private static final int VERSION_4_16_BIT = 19;
private static final int VERSION_4_24_BIT = 20;
private static final int VERSION_4_32_BIT = 21;
private static final int VERSION_3_XP_EMBEDDED = 22;
private static final int VERSION_3_EXT_EMBEDDED = 23;
private static final int VERSION_4_XP_EMBEDDED = 24;
private static final int VERSION_5_XP_EMBEDDED = 25;
// BMP variables
private long bitmapFileSize;
private long bitmapOffset;
private long bitmapStart;
private long compression;
private long imageSize;
private byte[] palette;
private int imageType;
private int numBands;
private boolean isBottomUp;
private int bitsPerPixel;
private int redMask, greenMask, blueMask, alphaMask;
private SampleModel sampleModel, originalSampleModel;
private ColorModel colorModel, originalColorModel;
/** The input stream where reads from */
private ImageInputStream iis = null;
/** Indicates whether the header is read. */
private boolean gotHeader = false;
/** The original image width. */
private int width;
/** The original image height. */
private int height;
/** The destination region. */
private Rectangle destinationRegion;
/** The source region. */
private Rectangle sourceRegion;
/** The metadata from the stream. */
private BMPMetadata metadata;
/** The destination image. */
private BufferedImage bi;
/** Indicates whether subsampled, subregion is required, and offset is
* defined
*/
private boolean noTransform = true;
/** Indicates whether subband is selected. */
private boolean seleBand = false;
/** The scaling factors. */
private int scaleX, scaleY;
/** source and destination bands. */
private int[] sourceBands, destBands;
/** Constructs {@code BMPImageReader} from the provided
* {@code ImageReaderSpi}.
*/
public BMPImageReader(ImageReaderSpi originator) {
super(originator);
}
/** Overrides the method defined in the superclass. */
public void setInput(Object input,
boolean seekForwardOnly,
boolean ignoreMetadata) {
super.setInput(input, seekForwardOnly, ignoreMetadata);
iis = (ImageInputStream) input; // Always works
if(iis != null)
iis.setByteOrder(ByteOrder.LITTLE_ENDIAN);
resetHeaderInfo();
}
/** Overrides the method defined in the superclass. */
public int getNumImages(boolean allowSearch) throws IOException {
if (iis == null) {
throw new IllegalStateException(I18N.getString("GetNumImages0"));
}
if (seekForwardOnly && allowSearch) {
throw new IllegalStateException(I18N.getString("GetNumImages1"));
}
return 1;
}
@Override
public int getWidth(int imageIndex) throws IOException {
checkIndex(imageIndex);
try {
readHeader();
} catch (IllegalArgumentException e) {
throw new IIOException(I18N.getString("BMPImageReader6"), e);
}
return width;
}
public int getHeight(int imageIndex) throws IOException {
checkIndex(imageIndex);
try {
readHeader();
} catch (IllegalArgumentException e) {
throw new IIOException(I18N.getString("BMPImageReader6"), e);
}
return height;
}
private void checkIndex(int imageIndex) {
if (imageIndex != 0) {
throw new IndexOutOfBoundsException(I18N.getString("BMPImageReader0"));
}
}
/**
* Process the image header.
*
* @exception IllegalStateException if source stream is not set.
*
* @exception IOException if image stream is corrupted.
*
* @exception IllegalArgumentException if the image stream does not contain
* a BMP image, or if a sample model instance to describe the
* image can not be created.
*/
protected void readHeader() throws IOException, IllegalArgumentException {
if (gotHeader)
return;
if (iis == null) {
throw new IllegalStateException("Input source not set!");
}
int profileData = 0, profileSize = 0;
this.metadata = new BMPMetadata();
iis.mark();
// read and check the magic marker
byte[] marker = new byte[2];
iis.read(marker);
if (marker[0] != 0x42 || marker[1] != 0x4d)
throw new IllegalArgumentException(I18N.getString("BMPImageReader1"));
// Read file size
bitmapFileSize = iis.readUnsignedInt();
// skip the two reserved fields
iis.skipBytes(4);
// Offset to the bitmap from the beginning
bitmapOffset = iis.readUnsignedInt();
// End File Header
// Start BitmapCoreHeader
long size = iis.readUnsignedInt();
if (size == 12) {
width = iis.readShort();
height = iis.readShort();
} else {
width = iis.readInt();
height = iis.readInt();
}
metadata.width = width;
metadata.height = height;
int planes = iis.readUnsignedShort();
bitsPerPixel = iis.readUnsignedShort();
//metadata.colorPlane = planes;
metadata.bitsPerPixel = (short)bitsPerPixel;
// As BMP always has 3 rgb bands, except for Version 5,
// which is bgra
numBands = 3;
if (size == 12) {
// Windows 2.x and OS/2 1.x
metadata.bmpVersion = VERSION_2;
// Classify the image type
if (bitsPerPixel == 1) {
imageType = VERSION_2_1_BIT;
} else if (bitsPerPixel == 4) {
imageType = VERSION_2_4_BIT;
} else if (bitsPerPixel == 8) {
imageType = VERSION_2_8_BIT;
} else if (bitsPerPixel == 24) {
imageType = VERSION_2_24_BIT;
} else {
throw new IIOException(I18N.getString("BMPImageReader8"));
}
// Read in the palette
int numberOfEntries = (int)((bitmapOffset - 14 - size) / 3);
int sizeOfPalette = numberOfEntries*3;
palette = new byte[sizeOfPalette];
iis.readFully(palette, 0, sizeOfPalette);
metadata.palette = palette;
metadata.paletteSize = numberOfEntries;
} else {
compression = iis.readUnsignedInt();
imageSize = iis.readUnsignedInt();
long xPelsPerMeter = iis.readInt();
long yPelsPerMeter = iis.readInt();
long colorsUsed = iis.readUnsignedInt();
long colorsImportant = iis.readUnsignedInt();
metadata.compression = (int)compression;
metadata.xPixelsPerMeter = (int)xPelsPerMeter;
metadata.yPixelsPerMeter = (int)yPelsPerMeter;
metadata.colorsUsed = (int)colorsUsed;
metadata.colorsImportant = (int)colorsImportant;
if (size == 40) {
// Windows 3.x and Windows NT
switch((int)compression) {
case BI_JPEG:
case BI_PNG:
metadata.bmpVersion = VERSION_3;
imageType = VERSION_3_XP_EMBEDDED;
break;
case BI_RGB: // No compression
case BI_RLE8: // 8-bit RLE compression
case BI_RLE4: // 4-bit RLE compression
// Read in the palette
if (bitmapOffset < (size + 14)) {
throw new IIOException(I18N.getString("BMPImageReader7"));
}
int numberOfEntries = (int)((bitmapOffset-14-size) / 4);
int sizeOfPalette = numberOfEntries * 4;
palette = new byte[sizeOfPalette];
iis.readFully(palette, 0, sizeOfPalette);
metadata.palette = palette;
metadata.paletteSize = numberOfEntries;
if (bitsPerPixel == 1) {
imageType = VERSION_3_1_BIT;
} else if (bitsPerPixel == 4) {
imageType = VERSION_3_4_BIT;
} else if (bitsPerPixel == 8) {
imageType = VERSION_3_8_BIT;
} else if (bitsPerPixel == 24) {
imageType = VERSION_3_24_BIT;
} else if (bitsPerPixel == 16) {
imageType = VERSION_3_NT_16_BIT;
redMask = 0x7C00;
greenMask = 0x3E0;
blueMask = (1 << 5) - 1;// 0x1F;
metadata.redMask = redMask;
metadata.greenMask = greenMask;
metadata.blueMask = blueMask;
} else if (bitsPerPixel == 32) {
imageType = VERSION_3_NT_32_BIT;
redMask = 0x00FF0000;
greenMask = 0x0000FF00;
blueMask = 0x000000FF;
metadata.redMask = redMask;
metadata.greenMask = greenMask;
metadata.blueMask = blueMask;
} else {
throw new
IIOException(I18N.getString("BMPImageReader8"));
}
metadata.bmpVersion = VERSION_3;
break;
case BI_BITFIELDS:
if (bitsPerPixel == 16) {
imageType = VERSION_3_NT_16_BIT;
} else if (bitsPerPixel == 32) {
imageType = VERSION_3_NT_32_BIT;
} else {
throw new
IIOException(I18N.getString("BMPImageReader8"));
}
// BitsField encoding
redMask = (int)iis.readUnsignedInt();
greenMask = (int)iis.readUnsignedInt();
blueMask = (int)iis.readUnsignedInt();
metadata.redMask = redMask;
metadata.greenMask = greenMask;
metadata.blueMask = blueMask;
if (colorsUsed != 0) {
// there is a palette
sizeOfPalette = (int)colorsUsed*4;
palette = new byte[sizeOfPalette];
iis.readFully(palette, 0, sizeOfPalette);
metadata.palette = palette;
metadata.paletteSize = (int)colorsUsed;
}
metadata.bmpVersion = VERSION_3_NT;
break;
default:
throw new
IIOException(I18N.getString("BMPImageReader2"));
}
} else if (size == 52 || size == 56) {
// BITMAPV2INFOHEADER or BITMAPV3INFOHEADER
redMask = (int)iis.readUnsignedInt();
greenMask = (int)iis.readUnsignedInt();
blueMask = (int)iis.readUnsignedInt();
if (size == 56) {
alphaMask = (int)iis.readUnsignedInt();
}
metadata.bmpVersion = VERSION_3_EXT;
// Read in the palette
int numberOfEntries = (int)((bitmapOffset-14-size) / 4);
int sizeOfPalette = numberOfEntries*4;
palette = new byte[sizeOfPalette];
iis.readFully(palette, 0, sizeOfPalette);
metadata.palette = palette;
metadata.paletteSize = numberOfEntries;
switch((int)compression) {
case BI_JPEG:
case BI_PNG:
imageType = VERSION_3_EXT_EMBEDDED;
break;
default:
if (bitsPerPixel == 1) {
imageType = VERSION_3_EXT_1_BIT;
} else if (bitsPerPixel == 4) {
imageType = VERSION_3_EXT_4_BIT;
} else if (bitsPerPixel == 8) {
imageType = VERSION_3_EXT_8_BIT;
} else if (bitsPerPixel == 16) {
imageType = VERSION_3_EXT_16_BIT;
if ((int)compression == BI_RGB) {
redMask = 0x7C00;
greenMask = 0x3E0;
blueMask = 0x1F;
}
} else if (bitsPerPixel == 24) {
imageType = VERSION_3_EXT_24_BIT;
} else if (bitsPerPixel == 32) {
imageType = VERSION_3_EXT_32_BIT;
if ((int)compression == BI_RGB) {
redMask = 0x00FF0000;
greenMask = 0x0000FF00;
blueMask = 0x000000FF;
}
} else {
throw new
IIOException(I18N.getString("BMPImageReader8"));
}
metadata.redMask = redMask;
metadata.greenMask = greenMask;
metadata.blueMask = blueMask;
metadata.alphaMask = alphaMask;
}
} else if (size == 108 || size == 124) {
// Windows 4.x BMP
if (size == 108)
metadata.bmpVersion = VERSION_4;
else if (size == 124)
metadata.bmpVersion = VERSION_5;
// rgb masks, valid only if comp is BI_BITFIELDS
redMask = (int)iis.readUnsignedInt();
greenMask = (int)iis.readUnsignedInt();
blueMask = (int)iis.readUnsignedInt();
// Only supported for 32bpp BI_RGB argb
alphaMask = (int)iis.readUnsignedInt();
long csType = iis.readUnsignedInt();
int redX = iis.readInt();
int redY = iis.readInt();
int redZ = iis.readInt();
int greenX = iis.readInt();
int greenY = iis.readInt();
int greenZ = iis.readInt();
int blueX = iis.readInt();
int blueY = iis.readInt();
int blueZ = iis.readInt();
long gammaRed = iis.readUnsignedInt();
long gammaGreen = iis.readUnsignedInt();
long gammaBlue = iis.readUnsignedInt();
if (size == 124) {
metadata.intent = iis.readInt();
profileData = iis.readInt();
profileSize = iis.readInt();
iis.skipBytes(4);
}
metadata.colorSpace = (int)csType;
if (csType == LCS_CALIBRATED_RGB) {
// All the new fields are valid only for this case
metadata.redX = redX;
metadata.redY = redY;
metadata.redZ = redZ;
metadata.greenX = greenX;
metadata.greenY = greenY;
metadata.greenZ = greenZ;
metadata.blueX = blueX;
metadata.blueY = blueY;
metadata.blueZ = blueZ;
metadata.gammaRed = (int)gammaRed;
metadata.gammaGreen = (int)gammaGreen;
metadata.gammaBlue = (int)gammaBlue;
}
// Read in the palette
int numberOfEntries = (int)((bitmapOffset-14-size) / 4);
int sizeOfPalette = numberOfEntries*4;
palette = new byte[sizeOfPalette];
iis.readFully(palette, 0, sizeOfPalette);
metadata.palette = palette;
metadata.paletteSize = numberOfEntries;
switch ((int)compression) {
case BI_JPEG:
case BI_PNG:
if (size == 108) {
imageType = VERSION_4_XP_EMBEDDED;
} else if (size == 124) {
imageType = VERSION_5_XP_EMBEDDED;
}
break;
default:
if (bitsPerPixel == 1) {
imageType = VERSION_4_1_BIT;
} else if (bitsPerPixel == 4) {
imageType = VERSION_4_4_BIT;
} else if (bitsPerPixel == 8) {
imageType = VERSION_4_8_BIT;
} else if (bitsPerPixel == 16) {
imageType = VERSION_4_16_BIT;
if ((int)compression == BI_RGB) {
redMask = 0x7C00;
greenMask = 0x3E0;
blueMask = 0x1F;
}
} else if (bitsPerPixel == 24) {
imageType = VERSION_4_24_BIT;
} else if (bitsPerPixel == 32) {
imageType = VERSION_4_32_BIT;
if ((int)compression == BI_RGB) {
redMask = 0x00FF0000;
greenMask = 0x0000FF00;
blueMask = 0x000000FF;
}
} else {
throw new
IIOException(I18N.getString("BMPImageReader8"));
}
metadata.redMask = redMask;
metadata.greenMask = greenMask;
metadata.blueMask = blueMask;
metadata.alphaMask = alphaMask;
}
} else {
throw new
IIOException(I18N.getString("BMPImageReader3"));
}
}
if (height > 0) {
// bottom up image
isBottomUp = true;
} else {
// top down image
isBottomUp = false;
height = Math.abs(height);
}
// Reset Image Layout so there's only one tile.
//Define the color space
ColorSpace colorSpace = ColorSpace.getInstance(ColorSpace.CS_sRGB);
if (metadata.colorSpace == PROFILE_LINKED ||
metadata.colorSpace == PROFILE_EMBEDDED) {
iis.mark();
iis.skipBytes(profileData - size);
byte[] profile = new byte[profileSize];
iis.readFully(profile, 0, profileSize);
iis.reset();
try {
if (metadata.colorSpace == PROFILE_LINKED &&
isLinkedProfileAllowed() &&
!isUncOrDevicePath(profile))
{
String path = new String(profile, "windows-1252");
colorSpace =
new ICC_ColorSpace(ICC_Profile.getInstance(path));
} else {
colorSpace =
new ICC_ColorSpace(ICC_Profile.getInstance(profile));
}
} catch (Exception e) {
colorSpace = ColorSpace.getInstance(ColorSpace.CS_sRGB);
}
}
if (bitsPerPixel == 0 ||
compression == BI_JPEG || compression == BI_PNG )
{
// the colorModel and sampleModel will be initialzed
// by the reader of embedded image
colorModel = null;
sampleModel = null;
} else if (bitsPerPixel == 1 || bitsPerPixel == 4 || bitsPerPixel == 8) {
// When number of bitsPerPixel is <= 8, we use IndexColorModel.
numBands = 1;
if (bitsPerPixel == 8) {
int[] bandOffsets = new int[numBands];
for (int i = 0; i < numBands; i++) {
bandOffsets[i] = numBands -1 -i;
}
sampleModel =
new PixelInterleavedSampleModel(DataBuffer.TYPE_BYTE,
width, height,
numBands,
numBands * width,
bandOffsets);
} else {
// 1 and 4 bit pixels can be stored in a packed format.
sampleModel =
new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE,
width, height,
bitsPerPixel);
}
// Create IndexColorModel from the palette.
byte[] r, g, b;
if (imageType == VERSION_2_1_BIT ||
imageType == VERSION_2_4_BIT ||
imageType == VERSION_2_8_BIT) {
size = palette.length/3;
if (size > 256) {
size = 256;
}
int off;
r = new byte[(int)size];
g = new byte[(int)size];
b = new byte[(int)size];
for (int i=0; i<(int)size; i++) {
off = 3 * i;
b[i] = palette[off];
g[i] = palette[off+1];
r[i] = palette[off+2];
}
} else {
size = palette.length/4;
if (size > 256) {
size = 256;
}
int off;
r = new byte[(int)size];
g = new byte[(int)size];
b = new byte[(int)size];
for (int i=0; i<size; i++) {
off = 4 * i;
b[i] = palette[off];
g[i] = palette[off+1];
r[i] = palette[off+2];
}
}
if (ImageUtil.isIndicesForGrayscale(r, g, b))
colorModel =
ImageUtil.createColorModel(null, sampleModel);
else
colorModel = new IndexColorModel(bitsPerPixel, (int)size, r, g, b);
} else if (bitsPerPixel == 16) {
numBands = 3;
sampleModel =
new SinglePixelPackedSampleModel(DataBuffer.TYPE_USHORT,
width, height,
new int[] {redMask, greenMask, blueMask});
colorModel =
new DirectColorModel(colorSpace,
16, redMask, greenMask, blueMask, 0,
false, DataBuffer.TYPE_USHORT);
} else if (bitsPerPixel == 32) {
numBands = alphaMask == 0 ? 3 : 4;
// The number of bands in the SampleModel is determined by
// the length of the mask array passed in.
int[] bitMasks = numBands == 3 ?
new int[] {redMask, greenMask, blueMask} :
new int[] {redMask, greenMask, blueMask, alphaMask};
sampleModel =
new SinglePixelPackedSampleModel(DataBuffer.TYPE_INT,
width, height,
bitMasks);
colorModel =
new DirectColorModel(colorSpace,
32, redMask, greenMask, blueMask, alphaMask,
false, DataBuffer.TYPE_INT);
} else {
numBands = 3;
// Create SampleModel
int[] bandOffsets = new int[numBands];
for (int i = 0; i < numBands; i++) {
bandOffsets[i] = numBands -1 -i;
}
sampleModel =
new PixelInterleavedSampleModel(DataBuffer.TYPE_BYTE,
width, height,
numBands,
numBands * width,
bandOffsets);
colorModel =
ImageUtil.createColorModel(colorSpace, sampleModel);
}
originalSampleModel = sampleModel;
originalColorModel = colorModel;
// Reset to the start of bitmap; then jump to the
//start of image data
iis.reset();
iis.skipBytes(bitmapOffset);
bitmapStart = iis.getStreamPosition();
gotHeader = true;
}
public Iterator<ImageTypeSpecifier> getImageTypes(int imageIndex)
throws IOException {
checkIndex(imageIndex);
try {
readHeader();
} catch (IllegalArgumentException e) {
throw new IIOException(I18N.getString("BMPImageReader6"), e);
}
ArrayList<ImageTypeSpecifier> list = new ArrayList<>(1);
list.add(new ImageTypeSpecifier(originalColorModel,
originalSampleModel));
return list.iterator();
}
public ImageReadParam getDefaultReadParam() {
return new ImageReadParam();
}
public IIOMetadata getImageMetadata(int imageIndex)
throws IOException {
checkIndex(imageIndex);
if (metadata == null) {
try {
readHeader();
} catch (IllegalArgumentException e) {
throw new IIOException(I18N.getString("BMPImageReader6"), e);
}
}
return metadata;
}
public IIOMetadata getStreamMetadata() throws IOException {
return null;
}
public boolean isRandomAccessEasy(int imageIndex) throws IOException {
checkIndex(imageIndex);
try {
readHeader();
} catch (IllegalArgumentException e) {
throw new IIOException(I18N.getString("BMPImageReader6"), e);
}
return metadata.compression == BI_RGB;
}
public BufferedImage read(int imageIndex, ImageReadParam param)
throws IOException {
if (iis == null) {
throw new IllegalStateException(I18N.getString("BMPImageReader5"));
}
checkIndex(imageIndex);
clearAbortRequest();
processImageStarted(imageIndex);
if (abortRequested()) {
processReadAborted();
return bi;
}
if (param == null)
param = getDefaultReadParam();
//read header
try {
readHeader();
} catch (IllegalArgumentException e) {
throw new IIOException(I18N.getString("BMPImageReader6"), e);
}
sourceRegion = new Rectangle(0, 0, 0, 0);
destinationRegion = new Rectangle(0, 0, 0, 0);
computeRegions(param, this.width, this.height,
param.getDestination(),
sourceRegion,
destinationRegion);
scaleX = param.getSourceXSubsampling();
scaleY = param.getSourceYSubsampling();
// If the destination band is set used it
sourceBands = param.getSourceBands();
destBands = param.getDestinationBands();
seleBand = (sourceBands != null) && (destBands != null);
noTransform =
destinationRegion.equals(new Rectangle(0, 0, width, height)) ||
seleBand;
if (!seleBand) {
sourceBands = new int[numBands];
destBands = new int[numBands];
for (int i = 0; i < numBands; i++)
destBands[i] = sourceBands[i] = i;
}
// If the destination is provided, then use it. Otherwise, create new one
bi = param.getDestination();
// Get the image data.
WritableRaster raster = null;
if (bi == null) {
if (sampleModel != null && colorModel != null) {
sampleModel =
sampleModel.createCompatibleSampleModel(destinationRegion.x +
destinationRegion.width,
destinationRegion.y +
destinationRegion.height);
if (seleBand)
sampleModel = sampleModel.createSubsetSampleModel(sourceBands);
raster = Raster.createWritableRaster(sampleModel, new Point());
bi = new BufferedImage(colorModel, raster, false, null);
}
} else {
raster = bi.getWritableTile(0, 0);
sampleModel = bi.getSampleModel();
colorModel = bi.getColorModel();
noTransform &= destinationRegion.equals(raster.getBounds());
}
byte[] bdata = null; // buffer for byte data
short[] sdata = null; // buffer for short data
int[] idata = null; // buffer for int data
// the sampleModel can be null in case of embedded image
if (sampleModel != null) {
if (sampleModel.getDataType() == DataBuffer.TYPE_BYTE)
bdata = ((DataBufferByte)raster.getDataBuffer()).getData();
else if (sampleModel.getDataType() == DataBuffer.TYPE_USHORT)
sdata = ((DataBufferUShort)raster.getDataBuffer()).getData();
else if (sampleModel.getDataType() == DataBuffer.TYPE_INT)
idata = ((DataBufferInt)raster.getDataBuffer()).getData();
}
iis.seek(bitmapStart);
// There should only be one tile.
switch(imageType) {
case VERSION_2_1_BIT:
// no compression
read1Bit(bdata);
break;
case VERSION_2_4_BIT:
// no compression
read4Bit(bdata);
break;
case VERSION_2_8_BIT:
// no compression
read8Bit(bdata);
break;
case VERSION_2_24_BIT:
// no compression
read24Bit(bdata);
break;
case VERSION_3_1_BIT:
// 1-bit images cannot be compressed.
read1Bit(bdata);
break;
case VERSION_3_4_BIT:
switch((int)compression) {
case BI_RGB:
read4Bit(bdata);
break;
case BI_RLE4:
readRLE4(bdata);
break;
default:
throw new
IIOException(I18N.getString("BMPImageReader1"));
}
break;
case VERSION_3_8_BIT:
switch((int)compression) {
case BI_RGB:
read8Bit(bdata);
break;
case BI_RLE8:
readRLE8(bdata);
break;
default:
throw new
IIOException(I18N.getString("BMPImageReader1"));
}
break;
case VERSION_3_24_BIT:
// 24-bit images are not compressed
read24Bit(bdata);
break;
case VERSION_3_NT_16_BIT:
read16Bit(sdata);
break;
case VERSION_3_NT_32_BIT:
read32Bit(idata);
break;
case VERSION_3_XP_EMBEDDED:
case VERSION_3_EXT_EMBEDDED:
case VERSION_4_XP_EMBEDDED:
case VERSION_5_XP_EMBEDDED:
bi = readEmbedded((int)compression, bi, param);
break;
case VERSION_3_EXT_1_BIT:
case VERSION_4_1_BIT:
read1Bit(bdata);
break;
case VERSION_3_EXT_4_BIT:
case VERSION_4_4_BIT:
switch((int)compression) {
case BI_RGB:
read4Bit(bdata);
break;
case BI_RLE4:
readRLE4(bdata);
break;
default:
throw new
IIOException(I18N.getString("BMPImageReader1"));
}
break;
case VERSION_3_EXT_8_BIT:
case VERSION_4_8_BIT:
switch((int)compression) {
case BI_RGB:
read8Bit(bdata);
break;
case BI_RLE8:
readRLE8(bdata);
break;
default:
throw new
IIOException(I18N.getString("BMPImageReader1"));
}
break;
case VERSION_3_EXT_16_BIT:
case VERSION_4_16_BIT:
read16Bit(sdata);
break;
case VERSION_3_EXT_24_BIT:
case VERSION_4_24_BIT:
read24Bit(bdata);
break;
case VERSION_3_EXT_32_BIT:
case VERSION_4_32_BIT:
read32Bit(idata);
break;
}
if (abortRequested())
processReadAborted();
else
processImageComplete();
return bi;
}
public boolean canReadRaster() {
return true;
}
public Raster readRaster(int imageIndex,
ImageReadParam param) throws IOException {
BufferedImage bi = read(imageIndex, param);
return bi.getData();
}
private void resetHeaderInfo() {
gotHeader = false;
bi = null;
sampleModel = originalSampleModel = null;
colorModel = originalColorModel = null;
}
public void reset() {
super.reset();
iis = null;
resetHeaderInfo();
}
// Deal with 1 Bit images using IndexColorModels
private void read1Bit(byte[] bdata) throws IOException {
int bytesPerScanline = (width + 7) / 8;
int padding = bytesPerScanline % 4;
if (padding != 0) {
padding = 4 - padding;
}
int lineLength = bytesPerScanline + padding;
if (noTransform) {
int j = isBottomUp ? (height -1)*bytesPerScanline : 0;
for (int i=0; i<height; i++) {
iis.readFully(bdata, j, bytesPerScanline);
iis.skipBytes(padding);
j += isBottomUp ? -bytesPerScanline : bytesPerScanline;
processImageUpdate(bi, 0, i,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F * i/destinationRegion.height);
if (abortRequested()) {
break;
}
}
} else {
byte[] buf = new byte[lineLength];
int lineStride =
((MultiPixelPackedSampleModel)sampleModel).getScanlineStride();
if (isBottomUp) {
int lastLine =
sourceRegion.y + (destinationRegion.height - 1) * scaleY;
iis.skipBytes(lineLength * (height - 1 - lastLine));
} else
iis.skipBytes(lineLength * sourceRegion.y);
int skipLength = lineLength * (scaleY - 1);
// cache the values to avoid duplicated computation
int[] srcOff = new int[destinationRegion.width];
int[] destOff = new int[destinationRegion.width];
int[] srcPos = new int[destinationRegion.width];
int[] destPos = new int[destinationRegion.width];
for (int i = destinationRegion.x, x = sourceRegion.x, j = 0;
i < destinationRegion.x + destinationRegion.width;
i++, j++, x += scaleX) {
srcPos[j] = x >> 3;
srcOff[j] = 7 - (x & 7);
destPos[j] = i >> 3;
destOff[j] = 7 - (i & 7);
}
int k = destinationRegion.y * lineStride;
if (isBottomUp)
k += (destinationRegion.height - 1) * lineStride;
for (int j = 0, y = sourceRegion.y;
j < destinationRegion.height; j++, y+=scaleY) {
iis.read(buf, 0, lineLength);
for (int i = 0; i < destinationRegion.width; i++) {
//get the bit and assign to the data buffer of the raster
int v = (buf[srcPos[i]] >> srcOff[i]) & 1;
bdata[k + destPos[i]] |= v << destOff[i];
}
k += isBottomUp ? -lineStride : lineStride;
iis.skipBytes(skipLength);
processImageUpdate(bi, 0, j,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F*j/destinationRegion.height);
if (abortRequested()) {
break;
}
}
}
}
// Method to read a 4 bit BMP image data
private void read4Bit(byte[] bdata) throws IOException {
int bytesPerScanline = (width + 1) / 2;
// Padding bytes at the end of each scanline
int padding = bytesPerScanline % 4;
if (padding != 0)
padding = 4 - padding;
int lineLength = bytesPerScanline + padding;
if (noTransform) {
int j = isBottomUp ? (height -1) * bytesPerScanline : 0;
for (int i=0; i<height; i++) {
iis.readFully(bdata, j, bytesPerScanline);
iis.skipBytes(padding);
j += isBottomUp ? -bytesPerScanline : bytesPerScanline;
processImageUpdate(bi, 0, i,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F * i/destinationRegion.height);
if (abortRequested()) {
break;
}
}
} else {
byte[] buf = new byte[lineLength];
int lineStride =
((MultiPixelPackedSampleModel)sampleModel).getScanlineStride();
if (isBottomUp) {
int lastLine =
sourceRegion.y + (destinationRegion.height - 1) * scaleY;
iis.skipBytes(lineLength * (height - 1 - lastLine));
} else
iis.skipBytes(lineLength * sourceRegion.y);
int skipLength = lineLength * (scaleY - 1);
// cache the values to avoid duplicated computation
int[] srcOff = new int[destinationRegion.width];
int[] destOff = new int[destinationRegion.width];
int[] srcPos = new int[destinationRegion.width];
int[] destPos = new int[destinationRegion.width];
for (int i = destinationRegion.x, x = sourceRegion.x, j = 0;
i < destinationRegion.x + destinationRegion.width;
i++, j++, x += scaleX) {
srcPos[j] = x >> 1;
srcOff[j] = (1 - (x & 1)) << 2;
destPos[j] = i >> 1;
destOff[j] = (1 - (i & 1)) << 2;
}
int k = destinationRegion.y * lineStride;
if (isBottomUp)
k += (destinationRegion.height - 1) * lineStride;
for (int j = 0, y = sourceRegion.y;
j < destinationRegion.height; j++, y+=scaleY) {
iis.read(buf, 0, lineLength);
for (int i = 0; i < destinationRegion.width; i++) {
//get the bit and assign to the data buffer of the raster
int v = (buf[srcPos[i]] >> srcOff[i]) & 0x0F;
bdata[k + destPos[i]] |= v << destOff[i];
}
k += isBottomUp ? -lineStride : lineStride;
iis.skipBytes(skipLength);
processImageUpdate(bi, 0, j,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F*j/destinationRegion.height);
if (abortRequested()) {
break;
}
}
}
}
// Method to read 8 bit BMP image data
private void read8Bit(byte[] bdata) throws IOException {
// Padding bytes at the end of each scanline
int padding = width % 4;
if (padding != 0) {
padding = 4 - padding;
}
int lineLength = width + padding;
if (noTransform) {
int j = isBottomUp ? (height -1) * width : 0;
for (int i=0; i<height; i++) {
iis.readFully(bdata, j, width);
iis.skipBytes(padding);
j += isBottomUp ? -width : width;
processImageUpdate(bi, 0, i,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F * i/destinationRegion.height);
if (abortRequested()) {
break;
}
}
} else {
byte[] buf = new byte[lineLength];
int lineStride =
((ComponentSampleModel)sampleModel).getScanlineStride();
if (isBottomUp) {
int lastLine =
sourceRegion.y + (destinationRegion.height - 1) * scaleY;
iis.skipBytes(lineLength * (height - 1 - lastLine));
} else
iis.skipBytes(lineLength * sourceRegion.y);
int skipLength = lineLength * (scaleY - 1);
int k = destinationRegion.y * lineStride;
if (isBottomUp)
k += (destinationRegion.height - 1) * lineStride;
k += destinationRegion.x;
for (int j = 0, y = sourceRegion.y;
j < destinationRegion.height; j++, y+=scaleY) {
iis.read(buf, 0, lineLength);
for (int i = 0, m = sourceRegion.x;
i < destinationRegion.width; i++, m += scaleX) {
//get the bit and assign to the data buffer of the raster
bdata[k + i] = buf[m];
}
k += isBottomUp ? -lineStride : lineStride;
iis.skipBytes(skipLength);
processImageUpdate(bi, 0, j,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F*j/destinationRegion.height);
if (abortRequested()) {
break;
}
}
}
}
// Method to read 24 bit BMP image data
private void read24Bit(byte[] bdata) throws IOException {
// Padding bytes at the end of each scanline
// width * bitsPerPixel should be divisible by 32
int padding = width * 3 % 4;
if ( padding != 0)
padding = 4 - padding;
int lineStride = width * 3;
int lineLength = lineStride + padding;
if (noTransform) {
int j = isBottomUp ? (height -1) * width * 3 : 0;
for (int i=0; i<height; i++) {
iis.readFully(bdata, j, lineStride);
iis.skipBytes(padding);
j += isBottomUp ? -lineStride : lineStride;
processImageUpdate(bi, 0, i,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F * i/destinationRegion.height);
if (abortRequested()) {
break;
}
}
} else {
byte[] buf = new byte[lineLength];
lineStride =
((ComponentSampleModel)sampleModel).getScanlineStride();
if (isBottomUp) {
int lastLine =
sourceRegion.y + (destinationRegion.height - 1) * scaleY;
iis.skipBytes(lineLength * (height - 1 - lastLine));
} else
iis.skipBytes(lineLength * sourceRegion.y);
int skipLength = lineLength * (scaleY - 1);
int k = destinationRegion.y * lineStride;
if (isBottomUp)
k += (destinationRegion.height - 1) * lineStride;
k += destinationRegion.x * 3;
for (int j = 0, y = sourceRegion.y;
j < destinationRegion.height; j++, y+=scaleY) {
iis.read(buf, 0, lineLength);
for (int i = 0, m = 3 * sourceRegion.x;
i < destinationRegion.width; i++, m += 3 * scaleX) {
//get the bit and assign to the data buffer of the raster
int n = 3 * i + k;
for (int b = 0; b < destBands.length; b++)
bdata[n + destBands[b]] = buf[m + sourceBands[b]];
}
k += isBottomUp ? -lineStride : lineStride;
iis.skipBytes(skipLength);
processImageUpdate(bi, 0, j,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F*j/destinationRegion.height);
if (abortRequested()) {
break;
}
}
}
}
private void read16Bit(short[] sdata) throws IOException {
// Padding bytes at the end of each scanline
// width * bitsPerPixel should be divisible by 32
int padding = width * 2 % 4;
if ( padding != 0)
padding = 4 - padding;
int lineLength = width + padding / 2;
if (noTransform) {
int j = isBottomUp ? (height -1) * width : 0;
for (int i=0; i<height; i++) {
iis.readFully(sdata, j, width);
iis.skipBytes(padding);
j += isBottomUp ? -width : width;
processImageUpdate(bi, 0, i,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F * i/destinationRegion.height);
if (abortRequested()) {
break;
}
}
} else {
short[] buf = new short[lineLength];
int lineStride =
((SinglePixelPackedSampleModel)sampleModel).getScanlineStride();
if (isBottomUp) {
int lastLine =
sourceRegion.y + (destinationRegion.height - 1) * scaleY;
iis.skipBytes(lineLength * (height - 1 - lastLine) << 1);
} else
iis.skipBytes(lineLength * sourceRegion.y << 1);
int skipLength = lineLength * (scaleY - 1) << 1;
int k = destinationRegion.y * lineStride;
if (isBottomUp)
k += (destinationRegion.height - 1) * lineStride;
k += destinationRegion.x;
for (int j = 0, y = sourceRegion.y;
j < destinationRegion.height; j++, y+=scaleY) {
iis.readFully(buf, 0, lineLength);
for (int i = 0, m = sourceRegion.x;
i < destinationRegion.width; i++, m += scaleX) {
//get the bit and assign to the data buffer of the raster
sdata[k + i] = buf[m];
}
k += isBottomUp ? -lineStride : lineStride;
iis.skipBytes(skipLength);
processImageUpdate(bi, 0, j,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F*j/destinationRegion.height);
if (abortRequested()) {
break;
}
}
}
}
private void read32Bit(int[] idata) throws IOException {
if (noTransform) {
int j = isBottomUp ? (height -1) * width : 0;
for (int i=0; i<height; i++) {
iis.readFully(idata, j, width);
j += isBottomUp ? -width : width;
processImageUpdate(bi, 0, i,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F * i/destinationRegion.height);
if (abortRequested()) {
break;
}
}
} else {
int[] buf = new int[width];
int lineStride =
((SinglePixelPackedSampleModel)sampleModel).getScanlineStride();
if (isBottomUp) {
int lastLine =
sourceRegion.y + (destinationRegion.height - 1) * scaleY;
iis.skipBytes(width * (height - 1 - lastLine) << 2);
} else
iis.skipBytes(width * sourceRegion.y << 2);
int skipLength = width * (scaleY - 1) << 2;
int k = destinationRegion.y * lineStride;
if (isBottomUp)
k += (destinationRegion.height - 1) * lineStride;
k += destinationRegion.x;
for (int j = 0, y = sourceRegion.y;
j < destinationRegion.height; j++, y+=scaleY) {
iis.readFully(buf, 0, width);
for (int i = 0, m = sourceRegion.x;
i < destinationRegion.width; i++, m += scaleX) {
//get the bit and assign to the data buffer of the raster
idata[k + i] = buf[m];
}
k += isBottomUp ? -lineStride : lineStride;
iis.skipBytes(skipLength);
processImageUpdate(bi, 0, j,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F*j/destinationRegion.height);
if (abortRequested()) {
break;
}
}
}
}
private void readRLE8(byte[] bdata) throws IOException {
// If imageSize field is not provided, calculate it.
int imSize = (int)imageSize;
if (imSize == 0) {
imSize = (int)(bitmapFileSize - bitmapOffset);
}
int padding = 0;
// If width is not 32 bit aligned, then while uncompressing each
// scanline will have padding bytes, calculate the amount of padding
int remainder = width % 4;
if (remainder != 0) {
padding = 4 - remainder;
}
// Read till we have the whole image
byte[] values = new byte[imSize];
int bytesRead = 0;
iis.readFully(values, 0, imSize);
// Since data is compressed, decompress it
decodeRLE8(imSize, padding, values, bdata);
}
private boolean copyRLE8ScanlineToDst(int lineNo,
byte[] val,
byte[] bdata) {
// Return value
boolean isSuccess = false;
// Reusing the code to copy 1 row of pixels or scanline to required
// destination buffer.
if (lineNo >= sourceRegion.y &&
lineNo < sourceRegion.y + sourceRegion.height) {
if (noTransform) {
int pos = lineNo * width;
for(int i = 0; i < width; i++)
bdata[pos++] = val[i];
processImageUpdate(bi, 0, lineNo,
destinationRegion.width, 1, 1, 1,
new int[]{0});
isSuccess = true;
} else if ((lineNo - sourceRegion.y) % scaleY == 0) {
int lineStride =
((ComponentSampleModel)sampleModel).getScanlineStride();
int currentLine = (lineNo - sourceRegion.y) / scaleY +
destinationRegion.y;
int pos = currentLine * lineStride;
pos += destinationRegion.x;
for (int i = sourceRegion.x;
i < sourceRegion.x + sourceRegion.width;
i += scaleX)
bdata[pos++] = val[i];
processImageUpdate(bi, 0, currentLine,
destinationRegion.width, 1, 1, 1,
new int[]{0});
isSuccess = true;
}
// Ensure to reset the scanline buffer once the copy is complete.
for(int scIndex = 0; scIndex < width; scIndex++) {
val[scIndex] = 0;
}
}
return isSuccess;
}
private void decodeRLE8(int imSize,
int padding,
byte[] values,
byte[] bdata) throws IOException {
byte[] val = new byte[width];
int count = 0, l = 0;
int value;
boolean flag = false;
int lineNo = isBottomUp ? height - 1 : 0;
int finished = 0;
// Ensure image source has sufficient data to decode
while ((count + 1) < imSize) {
value = values[count++] & 0xff;
if (value == 0) {
switch(values[count++] & 0xff) {
case 0:
// End-of-scanline marker
// Copy the decoded scanline to destination
if (copyRLE8ScanlineToDst(lineNo, val, bdata)) {
finished++;
}
processImageProgress(100.0F * finished / destinationRegion.height);
lineNo += isBottomUp ? -1 : 1;
l = 0;
if (abortRequested()) {
flag = true;
}
break;
case 1:
// End-of-RLE marker
flag = true;
// Check if the last decoded scanline was copied to
// destination bitmap
if (l != 0) {
// Copy the decoded scanline to destination
if (copyRLE8ScanlineToDst(lineNo, val, bdata)) {
finished++;
}
processImageProgress(100.0F * finished / destinationRegion.height);
lineNo += isBottomUp ? -1 : 1;
l = 0;
}
break;
case 2:
// delta or vector marker
if ((count+1) < imSize) {
int xoff = values[count++] & 0xff;
int yoff = values[count++] & 0xff;
// Check if the yOffset shifts the decoding to another
// row. In such cases, the decoded pixels in scanline
// buffer-val must be copied to the destination image.
if (yoff != 0) {
// Copy the decoded scanline to destination
if (copyRLE8ScanlineToDst(lineNo, val, bdata)) {
finished++;
}
processImageProgress(100.0F * finished
/ destinationRegion.height);
lineNo += isBottomUp ? -yoff : yoff;
}
// Move to the position xoff, yoff down
l += xoff + yoff*width;
l %= width;
}
break;
default:
int end = values[count-1] & 0xff;
byte readByte = 0;
// Ensure to check if the source index-count, does not
// exceed the source image size
for (int i=0; (i < end) && (count < imSize); i++) {
readByte = (byte)(values[count++] & 0xff);
// Ensure to check if scanline index-l, does not
// exceed the scanline buffer size (width of image)
if (l < width) {
val[l++] = readByte;
}
}
// Whenever end pixels can fit into odd number of bytes,
// an extra padding byte will be present, so skip that.
if ((end & 1) == 1) {
count++;
}
break;
}
} else {
// Encoded mode
// Ensure to check if the source index-count, does not
// exceed the source image size
if (count < imSize) {
for (int i=0; (i < value) && (l < width); i++) {
val[l++] = (byte)(values[count] & 0xff);
}
}
count++;
}
// If End-of-RLE data, then exit the while loop
if (flag) {
break;
}
}
}
private void readRLE4(byte[] bdata) throws IOException {
// If imageSize field is not specified, calculate it.
int imSize = (int)imageSize;
if (imSize == 0) {
imSize = (int)(bitmapFileSize - bitmapOffset);
}
int padding = 0;
// If width is not 32 byte aligned, then while uncompressing each
// scanline will have padding bytes, calculate the amount of padding
int remainder = width % 4;
if (remainder != 0) {
padding = 4 - remainder;
}
// Read till we have the whole image
byte[] values = new byte[imSize];
iis.readFully(values, 0, imSize);
// Decompress the RLE4 compressed data.
decodeRLE4(imSize, padding, values, bdata);
}
private boolean copyRLE4ScanlineToDst(int lineNo,
byte[] val,
byte[] bdata) throws IOException {
// Return value
boolean isSuccess = false;
// Reusing the code to copy 1 row of pixels or scanline to required
// destination buffer.
if (lineNo >= sourceRegion.y &&
lineNo < sourceRegion.y + sourceRegion.height) {
if (noTransform) {
int pos = lineNo * (width + 1 >> 1);
for(int i = 0, j = 0; i < width >> 1; i++)
bdata[pos++] =
(byte)((val[j++] << 4) | val[j++]);
if ((width & 1) == 1)
bdata[pos] |= val[width - 1] << 4;
processImageUpdate(bi, 0, lineNo,
destinationRegion.width, 1, 1, 1,
new int[]{0});
isSuccess = true;
} else if ((lineNo - sourceRegion.y) % scaleY == 0) {
int lineStride =
((MultiPixelPackedSampleModel)sampleModel).getScanlineStride();
int currentLine = (lineNo - sourceRegion.y) / scaleY +
destinationRegion.y;
int pos = currentLine * lineStride;
pos += destinationRegion.x >> 1;
int shift = (1 - (destinationRegion.x & 1)) << 2;
for (int i = sourceRegion.x;
i < sourceRegion.x + sourceRegion.width;
i += scaleX) {
bdata[pos] |= val[i] << shift;
shift += 4;
if (shift == 4) {
pos++;
}
shift &= 7;
}
processImageUpdate(bi, 0, currentLine,
destinationRegion.width, 1, 1, 1,
new int[]{0});
isSuccess = true;
}
// Ensure to reset the scanline buffer once the copy is complete.
for(int scIndex = 0; scIndex < width; scIndex++) {
val[scIndex] = 0;
}
}
return isSuccess;
}
private void decodeRLE4(int imSize,
int padding,
byte[] values,
byte[] bdata) throws IOException {
byte[] val = new byte[width];
int count = 0, l = 0;
int value;
boolean flag = false;
int lineNo = isBottomUp ? height - 1 : 0;
int finished = 0;
// Ensure the image has sufficient data before proceeding to decode
while ((count + 1) < imSize) {
value = values[count++] & 0xFF;
if (value == 0) {
// Absolute mode
switch(values[count++] & 0xFF) {
case 0:
// End-of-scanline marker
// Copy the decoded scanline to destination
if (copyRLE4ScanlineToDst(lineNo, val, bdata)) {
finished++;
}
processImageProgress(100.0F * finished / destinationRegion.height);
lineNo += isBottomUp ? -1 : 1;
l = 0;
if (abortRequested()) {
flag = true;
}
break;
case 1:
// End-of-RLE marker
flag = true;
// Check if the last decoded scanline was copied to
// destination bitmap
if (l != 0) {
// Copy the decoded scanline to destination
if (copyRLE4ScanlineToDst(lineNo, val, bdata)) {
finished++;
}
processImageProgress(100.0F * finished / destinationRegion.height);
lineNo += isBottomUp ? -1 : 1;
l = 0;
}
break;
case 2:
// delta or vector marker
if ((count + 1) < imSize) {
int xoff = values[count++] & 0xFF;
int yoff = values[count++] & 0xFF;
// Check if the yOffset shifts the decoding to another
// row. In such cases, the decoded pixels in scanline
// buffer-val must be copied to the destination image.
if (yoff != 0) {
// Copy the decoded scanline to destination
if (copyRLE4ScanlineToDst(lineNo, val, bdata)) {
finished++;
}
processImageProgress(100.0F * finished
/ destinationRegion.height);
lineNo += isBottomUp ? -yoff : yoff;
}
// Move to the position (xoff, yoff). Since l-is used
// to index into the scanline buffer, the accumulated
// offset is limited to the width of the scanline
l += xoff + yoff*width;
l %= width;
}
break;
default:
int end = values[count-1] & 0xFF;
byte readByte = 0;
// Ensure to check if the source index-count, does not
// exceed the source image size
for (int i = 0; (i < end) && (count < imSize); i++) {
readByte = (byte)(((i & 1) == 0) ?
(values[count] & 0xf0) >> 4 :
(values[count++] & 0x0f));
// Ensure to check if scanline index-l, does not
// exceed the scanline buffer size (width of image)
if (l < width) {
val[l++] = readByte;
}
}
// When end is odd, the above for loop does not
// increment count, so do it now.
if ((end & 1) == 1) {
count++;
}
// Whenever end pixels can fit into odd number of bytes,
// an extra padding byte will be present, so skip that.
if ((((end + 1) / 2) & 1) == 1) {
count++;
}
break;
}
} else {
// Encoded mode
// Ensure to check if the source index-count, does not
// exceed the source image size
if (count < imSize) {
int[] alternate = { (values[count] & 0xf0) >> 4,
values[count] & 0x0f };
for (int i=0; (i < value) && (l < width); i++) {
val[l++] = (byte)alternate[i & 1];
}
}
count++;
}
// If End-of-RLE data, then exit the while loop
if (flag) {
break;
}
}
}
/** Decodes the jpeg/png image embedded in the bitmap using any jpeg
* ImageIO-style plugin.
*
* @param bi The destination {@code BufferedImage}.
* @param bmpParam The {@code ImageReadParam} for decoding this
* BMP image. The parameters for subregion, band selection and
* subsampling are used in decoding the jpeg image.
*/
private BufferedImage readEmbedded(int type,
BufferedImage bi, ImageReadParam bmpParam)
/**代码未完, 请加载全部代码(NowJava.com).**/
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