/*
* $RCSfile: BMPImageDecoder.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.4 $
* $Date: 2006/08/22 00:12:03 $
* $State: Exp $
*/
package com.lightcrafts.media.jai.codecimpl;
import java.awt.Point;
import java.awt.color.ColorSpace;
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.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.WritableRaster;
import java.awt.image.IndexColorModel;
import java.awt.image.MultiPixelPackedSampleModel;
import java.awt.image.SinglePixelPackedSampleModel;
import java.io.IOException;
import java.io.BufferedInputStream;
import java.io.InputStream;
import com.lightcrafts.media.jai.codec.ImageCodec;
import com.lightcrafts.media.jai.codec.ImageDecoderImpl;
import com.lightcrafts.media.jai.codec.ImageDecodeParam;
import com.lightcrafts.media.jai.codecimpl.ImagingListenerProxy;
import com.lightcrafts.media.jai.codecimpl.util.ImagingException;
import com.lightcrafts.media.jai.codecimpl.util.RasterFactory;
/**
* @since EA2
*/
public class BMPImageDecoder extends ImageDecoderImpl {
public BMPImageDecoder(InputStream input, ImageDecodeParam param) {
super(input, param);
}
public RenderedImage decodeAsRenderedImage(int page) throws IOException {
if (page != 0) {
throw new IOException(JaiI18N.getString("BMPImageDecoder8"));
}
try {
return new BMPImage(input);
} catch(Exception e) {
throw CodecUtils.toIOException(e);
}
}
}
class BMPImage extends SimpleRenderedImage {
// BMP variables
private BufferedInputStream inputStream;
private long bitmapFileSize;
private long bitmapOffset;
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;
// 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;
private static final int VERSION_4_1_BIT = 10;
private static final int VERSION_4_4_BIT = 11;
private static final int VERSION_4_8_BIT = 12;
private static final int VERSION_4_16_BIT = 13;
private static final int VERSION_4_24_BIT = 14;
private static final int VERSION_4_32_BIT = 15;
// Color space types
private static final int LCS_CALIBRATED_RGB = 0;
private static final int LCS_sRGB = 1;
private static final int LCS_CMYK = 2;
// Compression Types
private static final int BI_RGB = 0;
private static final int BI_RLE8 = 1;
private static final int BI_RLE4 = 2;
private static final int BI_BITFIELDS = 3;
private WritableRaster theTile = null;
/**
* Constructor for BMPImage
*
* @param stream
*/
public BMPImage(InputStream stream) {
if (stream instanceof BufferedInputStream) {
inputStream = (BufferedInputStream)stream;
} else {
inputStream = new BufferedInputStream(stream);
}
try {
inputStream.mark(Integer.MAX_VALUE);
// Start File Header
if (!(readUnsignedByte(inputStream) == 'B' &&
readUnsignedByte(inputStream) == 'M')) {
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder0"));
}
// Read file size
bitmapFileSize = readDWord(inputStream);
// Read the two reserved fields
readWord(inputStream);
readWord(inputStream);
// Offset to the bitmap from the beginning
bitmapOffset = readDWord(inputStream);
// End File Header
// Start BitmapCoreHeader
long size = readDWord(inputStream);
if (size == 12) {
width = readWord(inputStream);
height = readWord(inputStream);
} else {
width = readLong(inputStream);
height = readLong(inputStream);
}
int planes = readWord(inputStream);
bitsPerPixel = readWord(inputStream);
properties.put("color_planes", new Integer(planes));
properties.put("bits_per_pixel", new Integer(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
properties.put("bmp_version", "BMP v. 2.x");
// 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;
}
// Read in the palette
int numberOfEntries = (int)((bitmapOffset-14-size) / 3);
int sizeOfPalette = numberOfEntries*3;
palette = new byte[sizeOfPalette];
inputStream.read(palette, 0, sizeOfPalette);
properties.put("palette", palette);
} else {
compression = readDWord(inputStream);
imageSize = readDWord(inputStream);
long xPelsPerMeter = readLong(inputStream);
long yPelsPerMeter = readLong(inputStream);
long colorsUsed = readDWord(inputStream);
long colorsImportant = readDWord(inputStream);
switch((int)compression) {
case BI_RGB:
properties.put("compression", "BI_RGB");
break;
case BI_RLE8:
properties.put("compression", "BI_RLE8");
break;
case BI_RLE4:
properties.put("compression", "BI_RLE4");
break;
case BI_BITFIELDS:
properties.put("compression", "BI_BITFIELDS");
break;
}
properties.put("x_pixels_per_meter", new Long(xPelsPerMeter));
properties.put("y_pixels_per_meter", new Long(yPelsPerMeter));
properties.put("colors_used", new Long(colorsUsed));
properties.put("colors_important", new Long(colorsImportant));
if (size == 40) {
// Windows 3.x and Windows NT
switch((int)compression) {
case BI_RGB: // No compression
case BI_RLE8: // 8-bit RLE compression
case BI_RLE4: // 4-bit RLE compression
// Read in the palette
int numberOfEntries = (int)((bitmapOffset-14-size) / 4);
int sizeOfPalette = numberOfEntries*4;
palette = new byte[sizeOfPalette];
inputStream.read(palette, 0, sizeOfPalette);
properties.put("palette", palette);
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 = 0x1F;
properties.put("red_mask", new Integer(redMask));
properties.put("green_mask", new Integer(greenMask));
properties.put("blue_mask", new Integer(blueMask));
} else if (bitsPerPixel == 32) {
imageType = VERSION_3_NT_32_BIT;
redMask = 0x00FF0000;
greenMask = 0x0000FF00;
blueMask = 0x000000FF;
properties.put("red_mask", new Integer(redMask));
properties.put("green_mask", new Integer(greenMask));
properties.put("blue_mask", new Integer(blueMask));
}
properties.put("bmp_version", "BMP v. 3.x");
break;
case BI_BITFIELDS:
if (bitsPerPixel == 16) {
imageType = VERSION_3_NT_16_BIT;
} else if (bitsPerPixel == 32) {
imageType = VERSION_3_NT_32_BIT;
}
// BitsField encoding
redMask = (int)readDWord(inputStream);
greenMask = (int)readDWord(inputStream);
blueMask = (int)readDWord(inputStream);
properties.put("red_mask", new Integer(redMask));
properties.put("green_mask", new Integer(greenMask));
properties.put("blue_mask", new Integer(blueMask));
if (colorsUsed != 0) {
// there is a palette
sizeOfPalette = (int)colorsUsed*4;
palette = new byte[sizeOfPalette];
inputStream.read(palette, 0, sizeOfPalette);
properties.put("palette", palette);
}
properties.put("bmp_version", "BMP v. 3.x NT");
break;
default:
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder1"));
}
} else if (size == 108) {
// Windows 4.x BMP
properties.put("bmp_version", "BMP v. 4.x");
// rgb masks, valid only if comp is BI_BITFIELDS
redMask = (int)readDWord(inputStream);
greenMask = (int)readDWord(inputStream);
blueMask = (int)readDWord(inputStream);
// Only supported for 32bpp BI_RGB argb
alphaMask = (int)readDWord(inputStream);
long csType = readDWord(inputStream);
int redX = readLong(inputStream);
int redY = readLong(inputStream);
int redZ = readLong(inputStream);
int greenX = readLong(inputStream);
int greenY = readLong(inputStream);
int greenZ = readLong(inputStream);
int blueX = readLong(inputStream);
int blueY = readLong(inputStream);
int blueZ = readLong(inputStream);
long gammaRed = readDWord(inputStream);
long gammaGreen = readDWord(inputStream);
long gammaBlue = readDWord(inputStream);
// Read in the palette
int numberOfEntries = (int)((bitmapOffset-14-size) / 4);
int sizeOfPalette = numberOfEntries*4;
palette = new byte[sizeOfPalette];
inputStream.read(palette, 0, sizeOfPalette);
if (palette != null || palette.length != 0) {
properties.put("palette", palette);
}
switch((int)csType) {
case LCS_CALIBRATED_RGB:
// All the new fields are valid only for this case
properties.put("color_space", "LCS_CALIBRATED_RGB");
properties.put("redX", new Integer(redX));
properties.put("redY", new Integer(redY));
properties.put("redZ", new Integer(redZ));
properties.put("greenX", new Integer(greenX));
properties.put("greenY", new Integer(greenY));
properties.put("greenZ", new Integer(greenZ));
properties.put("blueX", new Integer(blueX));
properties.put("blueY", new Integer(blueY));
properties.put("blueZ", new Integer(blueZ));
properties.put("gamma_red", new Long(gammaRed));
properties.put("gamma_green", new Long(gammaGreen));
properties.put("gamma_blue", new Long(gammaBlue));
// break;
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder2"));
case LCS_sRGB:
// Default Windows color space
properties.put("color_space", "LCS_sRGB");
break;
case LCS_CMYK:
properties.put("color_space", "LCS_CMYK");
// break;
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder2"));
}
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;
}
}
properties.put("red_mask", new Integer(redMask));
properties.put("green_mask", new Integer(greenMask));
properties.put("blue_mask", new Integer(blueMask));
properties.put("alpha_mask", new Integer(alphaMask));
} else {
properties.put("bmp_version", "BMP v. 5.x");
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder4"));
}
}
} catch (IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder5");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new RuntimeException(JaiI18N.getString("BMPImageDecoder5"));
}
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.
tileWidth = width;
tileHeight = height;
// When number of bitsPerPixel is <= 8, we use IndexColorModel.
if (bitsPerPixel == 1 || bitsPerPixel == 4 || bitsPerPixel == 8) {
numBands = 1;
if (bitsPerPixel == 8) {
sampleModel =
RasterFactory.createPixelInterleavedSampleModel(
DataBuffer.TYPE_BYTE,
width, height,
numBands);
} 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[];
int size;
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[size];
g = new byte[size];
b = new byte[size];
for (int i=0; i<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[size];
g = new byte[size];
b = new byte[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 (ImageCodec.isIndicesForGrayscale(r, g, b))
colorModel = ImageCodec.createComponentColorModel(sampleModel);
else
colorModel = new IndexColorModel(bitsPerPixel, 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.getInstance(ColorSpace.CS_sRGB),
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.getInstance(ColorSpace.CS_sRGB),
32, redMask, greenMask, blueMask, alphaMask,
false, DataBuffer.TYPE_INT);
} else {
numBands = 3;
// Create SampleModel
sampleModel =
RasterFactory.createPixelInterleavedSampleModel(
DataBuffer.TYPE_BYTE, width, height, numBands);
colorModel =
ImageCodec.createComponentColorModel(sampleModel);
}
try {
inputStream.reset();
inputStream.skip(bitmapOffset);
} catch (IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder9");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
}
}
// Deal with 1 Bit images using IndexColorModels
private void read1Bit(byte[] bdata, int paletteEntries) {
int padding = 0;
int bytesPerScanline = (int)Math.ceil((double)width/8.0);
int remainder = bytesPerScanline % 4;
if (remainder != 0) {
padding = 4 - remainder;
}
int imSize = (bytesPerScanline + padding) * height;
// Read till we have the whole image
byte values[] = new byte[imSize];
try {
int bytesRead = 0;
while (bytesRead < imSize) {
bytesRead += inputStream.read(values, bytesRead,
imSize - bytesRead);
}
} catch (IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder6");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new
// RuntimeException(JaiI18N.getString("BMPImageDecoder6"));
}
if (isBottomUp) {
// Convert the bottom up image to a top down format by copying
// one scanline from the bottom to the top at a time.
for (int i=0; i<height; i++) {
System.arraycopy(values,
imSize - (i+1)*(bytesPerScanline + padding),
bdata,
i*bytesPerScanline, bytesPerScanline);
}
} else {
for (int i=0; i<height; i++) {
System.arraycopy(values,
i * (bytesPerScanline + padding),
bdata,
i * bytesPerScanline,
bytesPerScanline);
}
}
}
// Method to read a 4 bit BMP image data
private void read4Bit(byte[] bdata, int paletteEntries) {
// Padding bytes at the end of each scanline
int padding = 0;
int bytesPerScanline = (int)Math.ceil((double)width/2.0);
int remainder = bytesPerScanline % 4;
if (remainder != 0) {
padding = 4 - remainder;
}
int imSize = (bytesPerScanline + padding) * height;
// Read till we have the whole image
byte values[] = new byte[imSize];
try {
int bytesRead = 0;
while (bytesRead < imSize) {
bytesRead += inputStream.read(values, bytesRead,
imSize - bytesRead);
}
} catch (IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder6");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new
// RuntimeException(JaiI18N.getString("BMPImageDecoder6"));
}
if (isBottomUp) {
// Convert the bottom up image to a top down format by copying
// one scanline from the bottom to the top at a time.
for (int i=0; i<height; i++) {
System.arraycopy(values,
imSize - (i+1)*(bytesPerScanline + padding),
bdata,
i*bytesPerScanline,
bytesPerScanline);
}
} else {
for (int i=0; i<height; i++) {
System.arraycopy(values,
i * (bytesPerScanline + padding),
bdata,
i * bytesPerScanline,
bytesPerScanline);
}
}
}
// Method to read 8 bit BMP image data
private void read8Bit(byte[] bdata, int paletteEntries) {
// Padding bytes at the end of each scanline
int padding = 0;
// width * bitsPerPixel should be divisible by 32
int bitsPerScanline = width * 8;
if ( bitsPerScanline%32 != 0) {
padding = (bitsPerScanline/32 + 1)*32 - bitsPerScanline;
padding = (int)Math.ceil(padding/8.0);
}
int imSize = (width + padding) * height;
// Read till we have the whole image
byte values[] = new byte[imSize];
try {
int bytesRead = 0;
while (bytesRead < imSize) {
bytesRead += inputStream.read(values, bytesRead,
imSize - bytesRead);
}
} catch (IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder6");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new
// RuntimeException(JaiI18N.getString("BMPImageDecoder6"));
}
if (isBottomUp) {
// Convert the bottom up image to a top down format by copying
// one scanline from the bottom to the top at a time.
for (int i=0; i<height; i++) {
System.arraycopy(values,
imSize - (i+1) * (width + padding),
bdata,
i * width,
width);
}
} else {
for (int i=0; i<height; i++) {
System.arraycopy(values,
i * (width + padding),
bdata,
i * width,
width);
}
}
}
// Method to read 24 bit BMP image data
private void read24Bit(byte[] bdata) {
// Padding bytes at the end of each scanline
int padding = 0;
// width * bitsPerPixel should be divisible by 32
int bitsPerScanline = width * 24;
if ( bitsPerScanline%32 != 0) {
padding = (bitsPerScanline/32 + 1)*32 - bitsPerScanline;
padding = (int)Math.ceil(padding/8.0);
}
int imSize = (int)imageSize;
if (imSize == 0) {
imSize = (int)(bitmapFileSize - bitmapOffset);
}
// Read till we have the whole image
byte values[] = new byte[imSize];
try {
int bytesRead = 0;
while (bytesRead < imSize) {
bytesRead += inputStream.read(values, bytesRead,
imSize - bytesRead);
}
} catch (IOException ioe) {
// throw new RuntimeException(JaiI18N.getString("BMPImageDecoder6"));
String message = JaiI18N.getString("BMPImageDecoder4");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new RuntimeException(ioe.getMessage());
}
int l=0, count;
if (isBottomUp) {
int max = width*height*3-1;
count = -padding;
for (int i=0; i<height; i++) {
l = max - (i+1)*width*3 + 1;
count += padding;
for (int j=0; j<width; j++) {
bdata[l++] = values[count++];
bdata[l++] = values[count++];
bdata[l++] = values[count++];
}
}
} else {
count = -padding;
for (int i=0; i<height; i++) {
count += padding;
for (int j=0; j<width; j++) {
bdata[l++] = values[count++];
bdata[l++] = values[count++];
bdata[l++] = values[count++];
}
}
}
}
private void read16Bit(short sdata[]) {
// Padding bytes at the end of each scanline
int padding = 0;
// width * bitsPerPixel should be divisible by 32
int bitsPerScanline = width * 16;
if ( bitsPerScanline%32 != 0) {
padding = (bitsPerScanline/32 + 1)*32 - bitsPerScanline;
padding = (int)Math.ceil(padding/8.0);
}
int imSize = (int)imageSize;
if (imSize == 0) {
imSize = (int)(bitmapFileSize - bitmapOffset);
}
int l=0;
try {
if (isBottomUp) {
int max = width*height-1;
for (int i=0; i<height; i++) {
l = max - (i+1)*width + 1;
for (int j=0; j<width; j++) {
sdata[l++] = (short)(readWord(inputStream) & 0xffff);
}
for (int m=0; m<padding; m++) {
inputStream.read();
}
}
} else {
for (int i=0; i<height; i++) {
for (int j=0; j<width; j++) {
sdata[l++] = (short)(readWord(inputStream) & 0xffff);
}
for (int m=0; m<padding; m++) {
inputStream.read();
}
}
}
} catch (IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder6");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new RuntimeException(JaiI18N.getString("BMPImageDecoder6"));
}
}
private void read32Bit(int idata[]) {
int imSize = (int)imageSize;
if (imSize == 0) {
imSize = (int)(bitmapFileSize - bitmapOffset);
}
int l=0;
try {
if (isBottomUp) {
int max = width*height-1;
for (int i=0; i<height; i++) {
l = max - (i+1)*width + 1;
for (int j=0; j<width; j++) {
idata[l++] = (int)readDWord(inputStream);
}
}
} else {
for (int i=0; i<height; i++) {
for (int j=0; j<width; j++) {
idata[l++] = (int)readDWord(inputStream);
}
}
}
} catch (IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder6");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new RuntimeException(JaiI18N.getString("BMPImageDecoder6"));
}
}
private void readRLE8(byte bdata[]) {
// 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];
try {
int bytesRead = 0;
while (bytesRead < imSize) {
bytesRead += inputStream.read(values, bytesRead,
imSize - bytesRead);
}
} catch (IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder6");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new RuntimeException(JaiI18N.getString("BMPImageDecoder6"));
}
// Since data is compressed, decompress it
byte val[] = decodeRLE8(imSize, padding, values);
// Uncompressed data does not have any padding
imSize = width * height;
if (isBottomUp) {
// Convert the bottom up image to a top down format by copying
// one scanline from the bottom to the top at a time.
// int bytesPerScanline = (int)Math.ceil((double)width/8.0);
int bytesPerScanline = width;
for (int i=0; i<height; i++) {
System.arraycopy(val,
imSize - (i+1)*(bytesPerScanline),
bdata,
i*bytesPerScanline, bytesPerScanline);
}
} else {
bdata = val;
}
}
private byte[] decodeRLE8(int imSize, int padding, byte values[]) {
byte val[] = new byte[width * height];
int count = 0, l = 0;
int value;
boolean flag = false;
while (count != imSize) {
value = values[count++] & 0xff;
if (value == 0) {
switch(values[count++] & 0xff) {
case 0:
// End-of-scanline marker
break;
case 1:
// End-of-RLE marker
flag = true;
break;
case 2:
// delta or vector marker
int xoff = values[count++] & 0xff;
int yoff = values[count] & 0xff;
// Move to the position xoff, yoff down
l += xoff + yoff*width;
break;
default:
int end = values[count-1] & 0xff;
for (int i=0; i<end; i++) {
val[l++] = (byte)(values[count++] & 0xff);
}
// Whenever end pixels can fit into odd number of bytes,
// an extra padding byte will be present, so skip that.
if (!isEven(end)) {
count++;
}
}
} else {
for (int i=0; i<value; i++) {
val[l++] = (byte)(values[count] & 0xff);
}
count++;
}
// If End-of-RLE data, then exit the while loop
if (flag) {
break;
}
}
return val;
}
private int[] readRLE4() {
// 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
int values[] = new int[imSize];
try {
for (int i=0; i<imSize; i++) {
values[i] = inputStream.read();
}
} catch(IOException ioe) {
String message = JaiI18N.getString("BMPImageDecoder6");
ImagingListenerProxy.errorOccurred(message,
new ImagingException(message, ioe),
this, false);
// throw new RuntimeException(JaiI18N.getString("BMPImageDecoder6"));
}
// Decompress the RLE4 compressed data.
int val[] = decodeRLE4(imSize, padding, values);
// Invert it as it is bottom up format.
if (isBottomUp) {
int inverted[] = val;
val = new int[width * height];
int l = 0, index, lineEnd;
for (int i = height-1; i >= 0; i--) {
index = i * width;
lineEnd = l + width;
while(l != lineEnd) {
val[l++] = inverted[index++];
}
}
}
// This array will be used to call setPixels as the decompression
// had unpacked the 4bit pixels each into an int.
return val;
}
private int[] decodeRLE4(int imSize, int padding, int values[]) {
int val[] = new int[width * height];
int count = 0, l = 0;
int value;
boolean flag = false;
while (count != imSize) {
value = values[count++];
if (value == 0) {
// Absolute mode
switch(values[count++]) {
case 0:
// End-of-scanline marker
break;
case 1:
// End-of-RLE marker
flag = true;
break;
case 2:
// delta or vector marker
int xoff = values[count++];
int yoff = values[count];
// Move to the position xoff, yoff down
l += xoff + yoff*width;
break;
default:
int end = values[count-1];
for (int i=0; i<end; i++) {
val[l++] = isEven(i) ? (values[count] & 0xf0) >> 4
: (values[count++] & 0x0f);
}
// When end is odd, the above for loop does not
// increment count, so do it now.
if (!isEven(end)) {
count++;
}
// Whenever end pixels can fit into odd number of bytes,
// an extra padding byte will be present, so skip that.
if ( !isEven((int)Math.ceil(end/2)) ) {
count++;
}
break;
}
} else {
// Encoded mode
int alternate[] = { (values[count] & 0xf0) >> 4,
values[count] & 0x0f };
for (int i=0; i<value; i++) {
val[l++] = alternate[i%2];
}
count++;
}
// If End-of-RLE data, then exit the while loop
if (flag) {
break;
}
}
return val;
}
private boolean isEven(int number) {
return (number%2 == 0 ? true : false);
}
// Windows defined data type reading methods - everything is little endian
// Unsigned 8 bits
private int readUnsignedByte(InputStream stream) throws IOException {
return (stream.read() & 0xff);
}
// Unsigned 2 bytes
private int readUnsignedShort(InputStream stream) throws IOException {
int b1 = readUnsignedByte(stream);
int b2 = readUnsignedByte(stream);
return ((b2 << 8) | b1) & 0xffff;
}
// Signed 16 bits
private int readShort(InputStream stream) throws IOException {
int b1 = readUnsignedByte(stream);
int b2 = readUnsignedByte(stream);
return (b2 << 8) | b1;
}
// Unsigned 16 bits
private int readWord(InputStream stream) throws IOException {
return readUnsignedShort(stream);
}
// Unsigned 4 bytes
private long readUnsignedInt(InputStream stream) throws IOException {
int b1 = readUnsignedByte(stream);
int b2 = readUnsignedByte(stream);
int b3 = readUnsignedByte(stream);
int b4 = readUnsignedByte(stream);
long l = (long)((b4 << 24) | (b3 << 16) | (b2 << 8) | b1);
return l & 0xffffffff;
}
// Signed 4 bytes
private int readInt(InputStream stream) throws IOException {
int b1 = readUnsignedByte(stream);
int b2 = readUnsignedByte(stream);
int b3 = readUnsignedByte(stream);
int b4 = readUnsignedByte(stream);
return (b4 << 24) | (b3 << 16) | (b2 << 8) | b1;
}
// Unsigned 4 bytes
private long readDWord(InputStream stream) throws IOException {
return readUnsignedInt(stream);
}
// 32 bit signed value
private int readLong(InputStream stream) throws IOException {
return readInt(stream);
}
private synchronized Raster computeTile(int tileX, int tileY) {
if (theTile != null) {
return theTile;
}
// Create a new tile
Point org = new Point(tileXToX(tileX), tileYToY(tileY));
WritableRaster tile =
RasterFactory.createWritableRaster(sampleModel, org);
byte bdata[] = null; // buffer for byte data
short sdata[] = null; // buffer for short data
int idata[] = null; // buffer for int data
if (sampleModel.getDataType() == DataBuffer.TYPE_BYTE)
bdata = (byte[])((DataBufferByte)tile.getDataBuffer()).getData();
else if (sampleModel.getDataType() == DataBuffer.TYPE_USHORT)
sdata = (short[])((DataBufferUShort)tile.getDataBuffer()).getData();
else if (sampleModel.getDataType() == DataBuffer.TYPE_INT)
idata = (int[])((DataBufferInt)tile.getDataBuffer()).getData();
// There should only be one tile.
switch(imageType) {
case VERSION_2_1_BIT:
// no compression
read1Bit(bdata, 3);
break;
case VERSION_2_4_BIT:
// no compression
read4Bit(bdata, 3);
break;
case VERSION_2_8_BIT:
// no compression
read8Bit(bdata, 3);
break;
case VERSION_2_24_BIT:
// no compression
read24Bit(bdata);
break;
case VERSION_3_1_BIT:
// 1-bit images cannot be compressed.
read1Bit(bdata, 4);
break;
case VERSION_3_4_BIT:
switch((int)compression) {
case BI_RGB:
read4Bit(bdata, 4);
break;
case BI_RLE4:
int pixels[] = readRLE4();
tile.setPixels(0, 0, width, height, pixels);
break;
default:
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder3"));
}
break;
case VERSION_3_8_BIT:
switch((int)compression) {
case BI_RGB:
read8Bit(bdata, 4);
break;
case BI_RLE8:
readRLE8(bdata);
break;
default:
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder3"));
}
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_4_1_BIT:
read1Bit(bdata, 4);
break;
case VERSION_4_4_BIT:
switch((int)compression) {
case BI_RGB:
read4Bit(bdata, 4);
break;
case BI_RLE4:
int pixels[] = readRLE4();
tile.setPixels(0, 0, width, height, pixels);
break;
default:
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder3"));
}
case VERSION_4_8_BIT:
switch((int)compression) {
case BI_RGB:
read8Bit(bdata, 4);
break;
case BI_RLE8:
readRLE8(bdata);
break;
default:
throw new
RuntimeException(JaiI18N.getString("BMPImageDecoder3"));
}
break;
case VERSION_4_16_BIT:
read16Bit(sdata);
break;
case VERSION_4_24_BIT:
read24Bit(bdata);
break;
case VERSION_4_32_BIT:
read32Bit(idata);
break;
}
theTile = tile;
return tile;
}
public synchronized Raster getTile(int tileX, int tileY) {
if ((tileX != 0) || (tileY != 0)) {
throw new
IllegalArgumentException(JaiI18N.getString("BMPImageDecoder7"));
}
return computeTile(tileX, tileY);
}
public void dispose() {
theTile = null;
}
}