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JpegEncoder.java
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package jstego;
// Version 1.0a
// Copyright (C) 1998, James R. Weeks and BioElectroMech.
// Visit BioElectroMech at www.obrador.com. Email [email protected].
// This is version 1.0a. This version corrected the dirty edges of images whose
// dimensions were not mutliples of 8.
// See license.txt for details about the allowed used of this software.
// This software is based in part on the work of the Independent JPEG Group.
// See IJGreadme.txt for details about the Independent JPEG Group's license.
//
// Licenses of all external software used by jfor can be found in the directory
// named "legal" of the jfor CVS, the files in question are:
// LICENSE.jpeg.encoder.txt
// and
// LICENSE.ijg.jpeg.txt
//
//
// This encoder is inspired by the Java Jpeg encoder by Florian Raemy,
// studwww.eurecom.fr/~raemy.
// It borrows a great deal of code and structure from the Independent
// Jpeg Group's Jpeg 6a library, Copyright Thomas G. Lane.
// See license.txt for details.
//import org.jfor.jfor.tools.jpeg.JPEGException;
import java.awt.AWTException;
import java.awt.Frame;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.image.PixelGrabber;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Vector;
/*
* JpegEncoder - The JPEG main program which performs a jpeg compression of
* an image.
*/
public class JpegEncoder extends Frame {
Thread runner;
BufferedOutputStream outStream;
Image image;
JpegInfo JpegObj;
Huffman Huf;
DCT dct;
int imageHeight, imageWidth;
int Quality;
int code;
public static int[] jpegNaturalOrder = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34,
27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36,
29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63,};
/** encode an image from binary data */
public JpegEncoder(byte[] data, int quality, OutputStream out) throws JPEGException {
this(Toolkit.getDefaultToolkit().createImage(data), quality, out);
}
/** encode an Image object */
public JpegEncoder(Image image, int quality, OutputStream out) throws JPEGException {
MediaTracker tracker = new MediaTracker(this);
tracker.addImage(image, 0);
try {
tracker.waitForID(0);
} catch (InterruptedException e) {
throw new JPEGException("MediaTracker error: " + e);
}
/*
* Quality of the image.
* 0 to 100 from bad image quality, high compression to good
* image quality low compression
*/
Quality = quality;
/*
* Getting picture information
* It takes the Width, Height and RGB scans of the image.
*/
JpegObj = new JpegInfo(image);
imageHeight = JpegObj.imageHeight;
imageWidth = JpegObj.imageWidth;
outStream = new BufferedOutputStream(out);
dct = new DCT(Quality);
Huf = new Huffman(imageWidth, imageHeight);
}
public JpegInfo getJpegInfo() {
return JpegObj;
}
public DCT getDct() {
return dct;
}
public int getImageWidth() {
return imageWidth;
}
public int getImageHeight() {
return imageHeight;
}
public void setQuality(int quality) {
dct = new DCT(quality);
}
public int getQuality() {
return Quality;
}
public void Compress() {
WriteHeaders(outStream);
WriteCompressedData(outStream);
WriteEOI(outStream);
try {
outStream.flush();
} catch (IOException e) {
System.out.println("IO Error: " + e.getMessage());
}
}
public void WriteCompressedData(BufferedOutputStream outStream) {
int offset, i, j, r, c, a, b, temp = 0;
int comp, xpos, ypos, xblockoffset, yblockoffset;
float inputArray[][];
float dctArray1[][] = new float[8][8];
double dctArray2[][] = new double[8][8];
int dctArray3[] = new int[8 * 8];
/*
* This method controls the compression of the image.
* Starting at the upper left of the image, it compresses 8x8 blocks
* of data until the entire image has been compressed.
*/
int lastDCvalue[] = new int[JpegObj.NumberOfComponents];
int zeroArray[] = new int[64]; // initialized to hold all zeros
int Width = 0, Height = 0;
int nothing = 0, not;
int MinBlockWidth, MinBlockHeight;
// This initial setting of MinBlockWidth and MinBlockHeight is done to
// ensure they start with values larger than will actually be the case.
MinBlockWidth = ((imageWidth % 8 != 0) ? (int) (Math.floor((double) imageWidth / 8.0) + 1) * 8 : imageWidth);
MinBlockHeight = ((imageHeight % 8 != 0) ? (int) (Math.floor((double) imageHeight / 8.0) + 1) * 8 : imageHeight);
for (comp = 0; comp < JpegObj.NumberOfComponents; comp++) {
MinBlockWidth = Math.min(MinBlockWidth, JpegObj.BlockWidth[comp]);
MinBlockHeight = Math.min(MinBlockHeight, JpegObj.BlockHeight[comp]);
}
xpos = 0;
for (r = 0; r < MinBlockHeight; r++) {
for (c = 0; c < MinBlockWidth; c++) {
xpos = c * 8;
ypos = r * 8;
for (comp = 0; comp < JpegObj.NumberOfComponents; comp++) {
Width = JpegObj.BlockWidth[comp];
Height = JpegObj.BlockHeight[comp];
inputArray = (float[][]) JpegObj.Components[comp];
for (i = 0; i < JpegObj.VsampFactor[comp]; i++) {
for (j = 0; j < JpegObj.HsampFactor[comp]; j++) {
xblockoffset = j * 8;
yblockoffset = i * 8;
for (a = 0; a < 8; a++) {
for (b = 0; b < 8; b++) {
// I believe this is where the dirty line at the bottom of the image is
// coming from. I need to do a check here to make sure I'm not reading past
// image data.
// This seems to not be a big issue right now. (04/04/98)
dctArray1[a][b] = inputArray[ypos + yblockoffset + a][xpos + xblockoffset + b];
}
}
// The following code commented out because on some images this technique
// results in poor right and bottom borders.
// if ((!JpegObj.lastColumnIsDummy[comp] || c < Width - 1) && (!JpegObj.lastRowIsDummy[comp] || r < Height - 1)) {
dctArray2 = dct.forwardDCT(dctArray1);
dctArray3 = dct.quantizeBlock(dctArray2, JpegObj.QtableNumber[comp]);
// }
// else {
// zeroArray[0] = dctArray3[0];
// zeroArray[0] = lastDCvalue[comp];
// dctArray3 = zeroArray;
// }
Huf.HuffmanBlockEncoder(outStream, dctArray3, lastDCvalue[comp], JpegObj.DCtableNumber[comp], JpegObj.ACtableNumber[comp]);
lastDCvalue[comp] = dctArray3[0];
}
}
}
}
}
Huf.flushBuffer(outStream);
}
public void WriteEOI(BufferedOutputStream out) {
byte[] EOI = {(byte) 0xFF, (byte) 0xD9};
WriteMarker(EOI, out);
}
public void WriteHeaders(BufferedOutputStream out) {
int i, j, index, offset, length;
int tempArray[];
// the SOI marker
byte[] SOI = {(byte) 0xFF, (byte) 0xD8};
WriteMarker(SOI, out);
// The order of the following headers is quite inconsequential.
// the JFIF header
byte JFIF[] = new byte[18];
JFIF[0] = (byte) 0xff;
JFIF[1] = (byte) 0xe0;
JFIF[2] = (byte) 0x00;
JFIF[3] = (byte) 0x10;
JFIF[4] = (byte) 0x4a;
JFIF[5] = (byte) 0x46;
JFIF[6] = (byte) 0x49;
JFIF[7] = (byte) 0x46;
JFIF[8] = (byte) 0x00;
JFIF[9] = (byte) 0x01;
JFIF[10] = (byte) 0x00;
JFIF[11] = (byte) 0x00;
JFIF[12] = (byte) 0x00;
JFIF[13] = (byte) 0x01;
JFIF[14] = (byte) 0x00;
JFIF[15] = (byte) 0x01;
JFIF[16] = (byte) 0x00;
JFIF[17] = (byte) 0x00;
WriteArray(JFIF, out);
// Comment Header
String comment = new String();
comment = JpegObj.getComment();
length = comment.length();
byte COM[] = new byte[length + 4];
COM[0] = (byte) 0xFF;
COM[1] = (byte) 0xFE;
COM[2] = (byte) ((length >> 8) & 0xFF);
COM[3] = (byte) (length & 0xFF);
java.lang.System.arraycopy(JpegObj.Comment.getBytes(), 0, COM, 4, JpegObj.Comment.length());
WriteArray(COM, out);
// The DQT header
// 0 is the luminance index and 1 is the chrominance index
byte DQT[] = new byte[134];
DQT[0] = (byte) 0xFF;
DQT[1] = (byte) 0xDB;
DQT[2] = (byte) 0x00;
DQT[3] = (byte) 0x84;
offset = 4;
for (i = 0; i < 2; i++) {
DQT[offset++] = (byte) ((0 << 4) + i);
tempArray = (int[]) dct.quantum[i];
for (j = 0; j < 64; j++) {
DQT[offset++] = (byte) tempArray[jpegNaturalOrder[j]];
}
}
WriteArray(DQT, out);
// Start of Frame Header
byte SOF[] = new byte[19];
SOF[0] = (byte) 0xFF;
SOF[1] = (byte) 0xC0;
SOF[2] = (byte) 0x00;
SOF[3] = (byte) 17;
SOF[4] = (byte) JpegObj.Precision;
SOF[5] = (byte) ((JpegObj.imageHeight >> 8) & 0xFF);
SOF[6] = (byte) ((JpegObj.imageHeight) & 0xFF);
SOF[7] = (byte) ((JpegObj.imageWidth >> 8) & 0xFF);
SOF[8] = (byte) ((JpegObj.imageWidth) & 0xFF);
SOF[9] = (byte) JpegObj.NumberOfComponents;
index = 10;
for (i = 0; i < SOF[9]; i++) {
SOF[index++] = (byte) JpegObj.CompID[i];
SOF[index++] = (byte) ((JpegObj.HsampFactor[i] << 4) + JpegObj.VsampFactor[i]);
SOF[index++] = (byte) JpegObj.QtableNumber[i];
}
WriteArray(SOF, out);
// The DHT Header
byte DHT1[], DHT2[], DHT3[], DHT4[];
int bytes, temp, oldindex, intermediateindex;
length = 2;
index = 4;
oldindex = 4;
DHT1 = new byte[17];
DHT4 = new byte[4];
DHT4[0] = (byte) 0xFF;
DHT4[1] = (byte) 0xC4;
for (i = 0; i < 4; i++) {
bytes = 0;
DHT1[index++ - oldindex] = (byte) ((int[]) Huf.bits.elementAt(i))[0];
for (j = 1; j < 17; j++) {
temp = ((int[]) Huf.bits.elementAt(i))[j];
DHT1[index++ - oldindex] = (byte) temp;
bytes += temp;
}
intermediateindex = index;
DHT2 = new byte[bytes];
for (j = 0; j < bytes; j++) {
DHT2[index++ - intermediateindex] = (byte) ((int[]) Huf.val.elementAt(i))[j];
}
DHT3 = new byte[index];
java.lang.System.arraycopy(DHT4, 0, DHT3, 0, oldindex);
java.lang.System.arraycopy(DHT1, 0, DHT3, oldindex, 17);
java.lang.System.arraycopy(DHT2, 0, DHT3, oldindex + 17, bytes);
DHT4 = DHT3;
oldindex = index;
}
DHT4[2] = (byte) (((index - 2) >> 8) & 0xFF);
DHT4[3] = (byte) ((index - 2) & 0xFF);
WriteArray(DHT4, out);
// Start of Scan Header
byte SOS[] = new byte[14];
SOS[0] = (byte) 0xFF;
SOS[1] = (byte) 0xDA;
SOS[2] = (byte) 0x00;
SOS[3] = (byte) 12;
SOS[4] = (byte) JpegObj.NumberOfComponents;
index = 5;
for (i = 0; i < SOS[4]; i++) {
SOS[index++] = (byte) JpegObj.CompID[i];
SOS[index++] = (byte) ((JpegObj.DCtableNumber[i] << 4) + JpegObj.ACtableNumber[i]);
}
SOS[index++] = (byte) JpegObj.Ss;
SOS[index++] = (byte) JpegObj.Se;
SOS[index++] = (byte) ((JpegObj.Ah << 4) + JpegObj.Al);
WriteArray(SOS, out);
}
void WriteMarker(byte[] data, BufferedOutputStream out) {
try {
out.write(data, 0, 2);
} catch (IOException e) {
System.out.println("IO Error: " + e.getMessage());
}
}
void WriteArray(byte[] data, BufferedOutputStream out) {
int i, length;
try {
length = (((int) (data[2] & 0xFF)) << 8) + (int) (data[3] & 0xFF) + 2;
out.write(data, 0, length);
} catch (IOException e) {
System.out.println("IO Error: " + e.getMessage());
}
}
}
// This class incorporates quality scaling as implemented in the JPEG-6a
// library.
/*
* DCT - A Java implementation of the Discreet Cosine Transform
*/
class DCT {
/**
* DCT Block Size - default 8
*/
public int N = 8;
/**
* Image Quality (0-100) - default 80 (good image / good compression)
*/
public int QUALITY = 80;
public Object quantum[] = new Object[2];
public Object Divisors[] = new Object[2];
/**
* Quantitization Matrix for luminace.
*/
public int quantum_luminance[] = new int[N * N];
public double DivisorsLuminance[] = new double[N * N];
/**
* Quantitization Matrix for chrominance.
*/
public int quantum_chrominance[] = new int[N * N];
public double DivisorsChrominance[] = new double[N * N];
/**
* Constructs a new DCT object. Initializes the cosine transform matrix
* these are used when computing the DCT and its inverse. This also
* initializes the run length counters and the ZigZag sequence. Note that
* the image quality can be worse than 25 however the image will be
* extemely pixelated, usually to a block size of N.
*
* @param QUALITY The quality of the image (0 worst - 100 best)
*
*/
public DCT(int QUALITY) {
initMatrix(QUALITY);
}
/*
* This method sets up the quantization matrix for luminance and
* chrominance using the Quality parameter.
*/
private void initMatrix(int quality) {
double[] AANscaleFactor = {1.0, 1.387039845, 1.306562965, 1.175875602,
1.0, 0.785694958, 0.541196100, 0.275899379};
int i;
int j;
int index;
int Quality;
int temp;
// converting quality setting to that specified in the jpeg_quality_scaling
// method in the IJG Jpeg-6a C libraries
Quality = quality;
if (Quality <= 0) {
Quality = 1;
}
if (Quality > 100) {
Quality = 100;
}
if (Quality < 50) {
Quality = 5000 / Quality;
} else {
Quality = 200 - Quality * 2;
}
// Creating the luminance matrix
quantum_luminance[0] = 16;
quantum_luminance[1] = 11;
quantum_luminance[2] = 10;
quantum_luminance[3] = 16;
quantum_luminance[4] = 24;
quantum_luminance[5] = 40;
quantum_luminance[6] = 51;
quantum_luminance[7] = 61;
quantum_luminance[8] = 12;
quantum_luminance[9] = 12;
quantum_luminance[10] = 14;
quantum_luminance[11] = 19;
quantum_luminance[12] = 26;
quantum_luminance[13] = 58;
quantum_luminance[14] = 60;
quantum_luminance[15] = 55;
quantum_luminance[16] = 14;
quantum_luminance[17] = 13;
quantum_luminance[18] = 16;
quantum_luminance[19] = 24;
quantum_luminance[20] = 40;
quantum_luminance[21] = 57;
quantum_luminance[22] = 69;
quantum_luminance[23] = 56;
quantum_luminance[24] = 14;
quantum_luminance[25] = 17;
quantum_luminance[26] = 22;
quantum_luminance[27] = 29;
quantum_luminance[28] = 51;
quantum_luminance[29] = 87;
quantum_luminance[30] = 80;
quantum_luminance[31] = 62;
quantum_luminance[32] = 18;
quantum_luminance[33] = 22;
quantum_luminance[34] = 37;
quantum_luminance[35] = 56;
quantum_luminance[36] = 68;
quantum_luminance[37] = 109;
quantum_luminance[38] = 103;
quantum_luminance[39] = 77;
quantum_luminance[40] = 24;
quantum_luminance[41] = 35;
quantum_luminance[42] = 55;
quantum_luminance[43] = 64;
quantum_luminance[44] = 81;
quantum_luminance[45] = 104;
quantum_luminance[46] = 113;
quantum_luminance[47] = 92;
quantum_luminance[48] = 49;
quantum_luminance[49] = 64;
quantum_luminance[50] = 78;
quantum_luminance[51] = 87;
quantum_luminance[52] = 103;
quantum_luminance[53] = 121;
quantum_luminance[54] = 120;
quantum_luminance[55] = 101;
quantum_luminance[56] = 72;
quantum_luminance[57] = 92;
quantum_luminance[58] = 95;
quantum_luminance[59] = 98;
quantum_luminance[60] = 112;
quantum_luminance[61] = 100;
quantum_luminance[62] = 103;
quantum_luminance[63] = 99;
for (j = 0; j < 64; j++) {
temp = (quantum_luminance[j] * Quality + 50) / 100;
if (temp <= 0) {
temp = 1;
}
if (temp > 255) {
temp = 255;
}
quantum_luminance[j] = temp;
}
index = 0;
for (i = 0; i < 8; i++) {
for (j = 0; j < 8; j++) {
// The divisors for the LL&M method (the slow integer method used in
// jpeg 6a library). This method is currently (04/04/98) incompletely
// implemented.
// DivisorsLuminance[index] = ((double) quantum_luminance[index]) << 3;
// The divisors for the AAN method (the float method used in jpeg 6a library.
DivisorsLuminance[index] = (double) ((double) 1.0 / ((double) quantum_luminance[index] * AANscaleFactor[i] * AANscaleFactor[j] * (double) 8.0));
index++;
}
}
// Creating the chrominance matrix
quantum_chrominance[0] = 17;
quantum_chrominance[1] = 18;
quantum_chrominance[2] = 24;
quantum_chrominance[3] = 47;
quantum_chrominance[4] = 99;
quantum_chrominance[5] = 99;
quantum_chrominance[6] = 99;
quantum_chrominance[7] = 99;
quantum_chrominance[8] = 18;
quantum_chrominance[9] = 21;
quantum_chrominance[10] = 26;
quantum_chrominance[11] = 66;
quantum_chrominance[12] = 99;
quantum_chrominance[13] = 99;
quantum_chrominance[14] = 99;
quantum_chrominance[15] = 99;
quantum_chrominance[16] = 24;
quantum_chrominance[17] = 26;
quantum_chrominance[18] = 56;
quantum_chrominance[19] = 99;
quantum_chrominance[20] = 99;
quantum_chrominance[21] = 99;
quantum_chrominance[22] = 99;
quantum_chrominance[23] = 99;
quantum_chrominance[24] = 47;
quantum_chrominance[25] = 66;
quantum_chrominance[26] = 99;
quantum_chrominance[27] = 99;
quantum_chrominance[28] = 99;
quantum_chrominance[29] = 99;
quantum_chrominance[30] = 99;
quantum_chrominance[31] = 99;
quantum_chrominance[32] = 99;
quantum_chrominance[33] = 99;
quantum_chrominance[34] = 99;
quantum_chrominance[35] = 99;
quantum_chrominance[36] = 99;
quantum_chrominance[37] = 99;
quantum_chrominance[38] = 99;
quantum_chrominance[39] = 99;
quantum_chrominance[40] = 99;
quantum_chrominance[41] = 99;
quantum_chrominance[42] = 99;
quantum_chrominance[43] = 99;
quantum_chrominance[44] = 99;
quantum_chrominance[45] = 99;
quantum_chrominance[46] = 99;
quantum_chrominance[47] = 99;
quantum_chrominance[48] = 99;
quantum_chrominance[49] = 99;
quantum_chrominance[50] = 99;
quantum_chrominance[51] = 99;
quantum_chrominance[52] = 99;
quantum_chrominance[53] = 99;
quantum_chrominance[54] = 99;
quantum_chrominance[55] = 99;
quantum_chrominance[56] = 99;
quantum_chrominance[57] = 99;
quantum_chrominance[58] = 99;
quantum_chrominance[59] = 99;
quantum_chrominance[60] = 99;
quantum_chrominance[61] = 99;
quantum_chrominance[62] = 99;
quantum_chrominance[63] = 99;
for (j = 0; j < 64; j++) {
temp = (quantum_chrominance[j] * Quality + 50) / 100;
if (temp <= 0) {
temp = 1;
}
if (temp >= 255) {
temp = 255;
}
quantum_chrominance[j] = temp;
}
index = 0;
for (i = 0; i < 8; i++) {
for (j = 0; j < 8; j++) {
// The divisors for the LL&M method (the slow integer method used in
// jpeg 6a library). This method is currently (04/04/98) incompletely
// implemented.
// DivisorsChrominance[index] = ((double) quantum_chrominance[index]) << 3;
// The divisors for the AAN method (the float method used in jpeg 6a library.
DivisorsChrominance[index] = (double) ((double) 1.0 / ((double) quantum_chrominance[index] * AANscaleFactor[i] * AANscaleFactor[j] * (double) 8.0));
index++;
}
}
// quantum and Divisors are objects used to hold the appropriate matices
quantum[0] = quantum_luminance;
Divisors[0] = DivisorsLuminance;
quantum[1] = quantum_chrominance;
Divisors[1] = DivisorsChrominance;
}
/*
* This method preforms forward DCT on a block of image data using
* the literal method specified for a 2-D Discrete Cosine Transform.
* It is included as a curiosity and can give you an idea of the
* difference in the compression result (the resulting image quality)
* by comparing its output to the output of the AAN method below.
* It is ridiculously inefficient.
*/
// For now the final output is unusable. The associated quantization step
// needs some tweaking. If you get this part working, please let me know.
public double[][] forwardDCTExtreme(float input[][]) {
double output[][] = new double[N][N];
double tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
double tmp10, tmp11, tmp12, tmp13;
double z1, z2, z3, z4, z5, z11, z13;
int i;
int j;
int v, u, x, y;
for (v = 0; v < 8; v++) {
for (u = 0; u < 8; u++) {
for (x = 0; x < 8; x++) {
for (y = 0; y < 8; y++) {
output[v][u] += ((double) input[x][y]) * Math.cos(((double) (2 * x + 1) * (double) u * Math.PI) / (double) 16) * Math.cos(((double) (2 * y + 1) * (double) v * Math.PI) / (double) 16);
}
}
output[v][u] *= (double) (0.25) * ((u == 0) ? ((double) 1.0 / Math.sqrt(2)) : (double) 1.0) * ((v == 0) ? ((double) 1.0 / Math.sqrt(2)) : (double) 1.0);
}
}
return output;
}
/*
* This method preforms a DCT on a block of image data using the AAN
* method as implemented in the IJG Jpeg-6a library.
*/
public double[][] forwardDCT(float input[][]) {
double output[][] = new double[N][N];
double tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
double tmp10, tmp11, tmp12, tmp13;
double z1, z2, z3, z4, z5, z11, z13;
int i;
int j;
// Subtracts 128 from the input values
for (i = 0; i < 8; i++) {
for (j = 0; j < 8; j++) {
output[i][j] = ((double) input[i][j] - (double) 128.0);
// input[i][j] -= 128;
}
}
for (i = 0; i < 8; i++) {
tmp0 = output[i][0] + output[i][7];
tmp7 = output[i][0] - output[i][7];
tmp1 = output[i][1] + output[i][6];
tmp6 = output[i][1] - output[i][6];
tmp2 = output[i][2] + output[i][5];
tmp5 = output[i][2] - output[i][5];
tmp3 = output[i][3] + output[i][4];
tmp4 = output[i][3] - output[i][4];
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
output[i][0] = tmp10 + tmp11;
output[i][4] = tmp10 - tmp11;
z1 = (tmp12 + tmp13) * (double) 0.707106781;
output[i][2] = tmp13 + z1;
output[i][6] = tmp13 - z1;
tmp10 = tmp4 + tmp5;
tmp11 = tmp5 + tmp6;
tmp12 = tmp6 + tmp7;
z5 = (tmp10 - tmp12) * (double) 0.382683433;
z2 = ((double) 0.541196100) * tmp10 + z5;
z4 = ((double) 1.306562965) * tmp12 + z5;
z3 = tmp11 * ((double) 0.707106781);
z11 = tmp7 + z3;
z13 = tmp7 - z3;
output[i][5] = z13 + z2;
output[i][3] = z13 - z2;
output[i][1] = z11 + z4;
output[i][7] = z11 - z4;
}
for (i = 0; i < 8; i++) {
tmp0 = output[0][i] + output[7][i];
tmp7 = output[0][i] - output[7][i];
tmp1 = output[1][i] + output[6][i];
tmp6 = output[1][i] - output[6][i];
tmp2 = output[2][i] + output[5][i];
tmp5 = output[2][i] - output[5][i];
tmp3 = output[3][i] + output[4][i];
tmp4 = output[3][i] - output[4][i];
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
output[0][i] = tmp10 + tmp11;
output[4][i] = tmp10 - tmp11;
z1 = (tmp12 + tmp13) * (double) 0.707106781;
output[2][i] = tmp13 + z1;
output[6][i] = tmp13 - z1;
tmp10 = tmp4 + tmp5;
tmp11 = tmp5 + tmp6;
tmp12 = tmp6 + tmp7;
z5 = (tmp10 - tmp12) * (double) 0.382683433;
z2 = ((double) 0.541196100) * tmp10 + z5;
z4 = ((double) 1.306562965) * tmp12 + z5;
z3 = tmp11 * ((double) 0.707106781);
z11 = tmp7 + z3;
z13 = tmp7 - z3;
output[5][i] = z13 + z2;
output[3][i] = z13 - z2;
output[1][i] = z11 + z4;
output[7][i] = z11 - z4;
}
return output;
}
/*
* This method quantitizes data and rounds it to the nearest integer.
*/
public int[] quantizeBlock(double inputData[][], int code) {
int outputData[] = new int[N * N];
int i, j;
int index;
index = 0;
for (i = 0; i < 8; i++) {
for (j = 0; j < 8; j++) {
// The second line results in significantly better compression.
outputData[index] = (int) (Math.round(inputData[i][j] * (((double[]) (Divisors[code]))[index])));
// outputData[index] = (int)(((inputData[i][j] * (((double[]) (Divisors[code]))[index])) + 16384.5) -16384);
index++;
}
}
return outputData;
}
/*
* This is the method for quantizing a block DCT'ed with forwardDCTExtreme
* This method quantitizes data and rounds it to the nearest integer.
*/
public int[] quantizeBlockExtreme(double inputData[][], int code) {
int outputData[] = new int[N * N];
int i, j;
int index;
index = 0;
for (i = 0; i < 8; i++) {
for (j = 0; j < 8; j++) {
outputData[index] = (int) (Math.round(inputData[i][j] / (double) (((int[]) (quantum[code]))[index])));
index++;
}
}
return outputData;
}
}
// This class was modified by James R. Weeks on 3/27/98.
// It now incorporates Huffman table derivation as in the C jpeg library
// from the IJG, Jpeg-6a.
class Huffman {
int bufferPutBits, bufferPutBuffer;
public int ImageHeight;
public int ImageWidth;
public int DC_matrix0[][];
public int AC_matrix0[][];
public int DC_matrix1[][];
public int AC_matrix1[][];
public Object DC_matrix[];
public Object AC_matrix[];
public int code;
public int NumOfDCTables;
public int NumOfACTables;
public int[] bitsDCluminance = {0x00, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0};
public int[] valDCluminance = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
public int[] bitsDCchrominance = {0x01, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0};
public int[] valDCchrominance = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
public int[] bitsACluminance = {0x10, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d};
public int[] valACluminance = {0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa};
public int[] bitsACchrominance = {0x11, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77};
;
public int[] valACchrominance = {0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa};
public Vector bits;
public Vector val;
/*
* jpegNaturalOrder[i] is the natural-order position of the i'th element
* of zigzag order.
*/
public static int[] jpegNaturalOrder = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34,
27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36,
29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63,};
/*
* The Huffman class constructor
*/
public Huffman(int Width, int Height) {
bits = new Vector();
bits.addElement(bitsDCluminance);
bits.addElement(bitsACluminance);
bits.addElement(bitsDCchrominance);
bits.addElement(bitsACchrominance);
val = new Vector();
val.addElement(valDCluminance);
val.addElement(valACluminance);
val.addElement(valDCchrominance);
val.addElement(valACchrominance);
initHuf();
code = code;
ImageWidth = Width;
ImageHeight = Height;
}
/**
* HuffmanBlockEncoder run length encodes and Huffman encodes the quantized
* data.
**/
public void HuffmanBlockEncoder(BufferedOutputStream outStream, int zigzag[], int prec, int DCcode, int ACcode) {
int temp, temp2, nbits, k, r, i;
NumOfDCTables = 2;
NumOfACTables = 2;
// The DC portion
temp = temp2 = zigzag[0] - prec;
if (temp < 0) {
temp = -temp;
temp2--;
}
nbits = 0;
while (temp != 0) {
nbits++;
temp >>= 1;
}
// if (nbits > 11) nbits = 11;
bufferIt(outStream, ((int[][]) DC_matrix[DCcode])[nbits][0], ((int[][]) DC_matrix[DCcode])[nbits][1]);
// The arguments in bufferIt are code and size.
if (nbits != 0) {
bufferIt(outStream, temp2, nbits);
}
// The AC portion
r = 0;
for (k = 1; k < 64; k++) {
if ((temp = zigzag[jpegNaturalOrder[k]]) == 0) {
r++;
} else {
while (r > 15) {
bufferIt(outStream, ((int[][]) AC_matrix[ACcode])[0xF0][0], ((int[][]) AC_matrix[ACcode])[0xF0][1]);
r -= 16;
}
temp2 = temp;
if (temp < 0) {
temp = -temp;
temp2--;
}
nbits = 1;
while ((temp >>= 1) != 0) {
nbits++;
}
i = (r << 4) + nbits;
bufferIt(outStream, ((int[][]) AC_matrix[ACcode])[i][0], ((int[][]) AC_matrix[ACcode])[i][1]);
bufferIt(outStream, temp2, nbits);
r = 0;
}
}
if (r > 0) {
bufferIt(outStream, ((int[][]) AC_matrix[ACcode])[0][0], ((int[][]) AC_matrix[ACcode])[0][1]);
}
}
// Uses an integer long (32 bits) buffer to store the Huffman encoded bits
// and sends them to outStream by the byte.
void bufferIt(BufferedOutputStream outStream, int code, int size) {
int PutBuffer = code;
int PutBits = bufferPutBits;
PutBuffer &= (1 << size) - 1;
PutBits += size;
PutBuffer <<= 24 - PutBits;
PutBuffer |= bufferPutBuffer;
while (PutBits >= 8) {
int c = ((PutBuffer >> 16) & 0xFF);
try {
outStream.write(c);
} catch (IOException e) {
System.out.println("IO Error: " + e.getMessage());
}
if (c == 0xFF) {
try {
outStream.write(0);
} catch (IOException e) {
System.out.println("IO Error: " + e.getMessage());
}
}
PutBuffer <<= 8;
PutBits -= 8;
}
bufferPutBuffer = PutBuffer;