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package com.tightvnc.decoder;
import com.tightvnc.decoder.common.Repaintable;
import com.tightvnc.vncviewer.RfbInputStream;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.image.ImageObserver;
import java.util.zip.Inflater;
//
// Class that used for decoding Tight encoded data.
//
public class TightDecoder extends RawDecoder {
//
// Tight decoder constants
//
final static int TightExplicitFilter = 0x04;
final static int TightFill = 0x08;
final static int TightJpeg = 0x09;
final static int TightMaxSubencoding = 0x09;
final static int TightFilterCopy = 0x00;
final static int TightFilterPalette = 0x01;
final static int TightFilterGradient = 0x02;
final static int TightMinToCompress = 12;
// Tight encoder's data.
final static int tightZlibBufferSize = 512;
public TightDecoder(Graphics g, RfbInputStream is) {
super(g, is);
tightInflaters = new Inflater[4];
}
public TightDecoder(Graphics g, RfbInputStream is, int frameBufferW,
int frameBufferH) {
super(g, is, frameBufferW, frameBufferH);
tightInflaters = new Inflater[4];
}
//
// Set and get methods for private TightDecoder
//
public void setRepainableControl(Repaintable r) {
repainatableControl = r;
}
//
// JPEG processing statistic methods
//
public int getNumJPEGRects() {
return statNumRectsTightJPEG;
}
public void setNumJPEGRects(int v) {
statNumRectsTightJPEG = v;
}
//
// Decode 1bpp-encoded bi-color rectangle (8-bit and 24-bit versions).
//
private void decodeMonoData(int x, int y, int w, int h, byte[] src, byte[] palette) {
int dx, dy, n;
int i = y * framebufferWidth + x;
int rowBytes = (w + 7) / 8;
byte b;
for (dy = 0; dy < h; dy++) {
for (dx = 0; dx < w / 8; dx++) {
b = src[dy*rowBytes+dx];
for (n = 7; n >= 0; n--)
pixels8[i++] = palette[b >> n & 1];
}
for (n = 7; n >= 8 - w % 8; n--) {
pixels8[i++] = palette[src[dy*rowBytes+dx] >> n & 1];
}
i += (framebufferWidth - w);
}
}
private void decodeMonoData(int x, int y, int w, int h, byte[] src, int[] palette) {
int dx, dy, n;
int i = y * framebufferWidth + x;
int rowBytes = (w + 7) / 8;
byte b;
for (dy = 0; dy < h; dy++) {
for (dx = 0; dx < w / 8; dx++) {
b = src[dy*rowBytes+dx];
for (n = 7; n >= 0; n--)
pixels24[i++] = palette[b >> n & 1];
}
for (n = 7; n >= 8 - w % 8; n--) {
pixels24[i++] = palette[src[dy*rowBytes+dx] >> n & 1];
}
i += (framebufferWidth - w);
}
}
//
// Decode data processed with the "Gradient" filter.
//
private void decodeGradientData (int x, int y, int w, int h, byte[] buf) {
int dx, dy, c;
byte[] prevRow = new byte[w * 3];
byte[] thisRow = new byte[w * 3];
byte[] pix = new byte[3];
int[] est = new int[3];
int offset = y * framebufferWidth + x;
for (dy = 0; dy < h; dy++) {
/* First pixel in a row */
for (c = 0; c < 3; c++) {
pix[c] = (byte)(prevRow[c] + buf[dy * w * 3 + c]);
thisRow[c] = pix[c];
}
pixels24[offset++] =
(pix[0] & 0xFF) << 16 | (pix[1] & 0xFF) << 8 | (pix[2] & 0xFF);
/* Remaining pixels of a row */
for (dx = 1; dx < w; dx++) {
for (c = 0; c < 3; c++) {
est[c] = ((prevRow[dx * 3 + c] & 0xFF) + (pix[c] & 0xFF) -
(prevRow[(dx-1) * 3 + c] & 0xFF));
if (est[c] > 0xFF) {
est[c] = 0xFF;
} else if (est[c] < 0x00) {
est[c] = 0x00;
}
pix[c] = (byte)(est[c] + buf[(dy * w + dx) * 3 + c]);
thisRow[dx * 3 + c] = pix[c];
}
pixels24[offset++] =
(pix[0] & 0xFF) << 16 | (pix[1] & 0xFF) << 8 | (pix[2] & 0xFF);
}
System.arraycopy(thisRow, 0, prevRow, 0, w * 3);
offset += (framebufferWidth - w);
}
}
//
// Private members
//
private Inflater[] tightInflaters;
// Since JPEG images are loaded asynchronously, we have to remember
// their position in the framebuffer. Also, this jpegRect object is
// used for synchronization between the rfbThread and a JVM's thread
// which decodes and loads JPEG images.
private Rectangle jpegRect;
private Repaintable repainatableControl = null;
// Jpeg decoding statistics
private int statNumRectsTightJPEG = 0;
}
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