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package com.tightvnc.decoder;
import com.tightvnc.vncviewer.RfbInputStream;
import java.awt.Graphics;
import java.awt.Color;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
//
// Class that used for decoding RRE encoded data.
//
public class RREDecoder extends RawDecoder {
final static int EncodingRRE = 2;
public RREDecoder(Graphics g, RfbInputStream is) {
super(g, is);
}
public RREDecoder(Graphics g, RfbInputStream is, int frameBufferW,
int frameBufferH) {
super(g, is, frameBufferW, frameBufferH);
}
//
// Override handleRect method to decode RRE encoded data insted of
// raw pixel data.
//
public void handleRect(int x, int y, int w, int h) throws IOException {
//
// Write encoding ID to record output stream
//
if (dos != null) {
dos.writeInt(RREDecoder.EncodingRRE);
}
int nSubrects = rfbis.readU32();
byte[] bg_buf = new byte[bytesPerPixel];
rfbis.readFully(bg_buf);
Color pixel;
if (bytesPerPixel == 1) {
pixel = getColor256()[bg_buf[0] & 0xFF];
} else {
pixel = new Color(bg_buf[2] & 0xFF, bg_buf[1] & 0xFF, bg_buf[0] & 0xFF);
}
graphics.setColor(pixel);
graphics.fillRect(x, y, w, h);
byte[] buf = new byte[nSubrects * (bytesPerPixel + 8)];
rfbis.readFully(buf);
DataInputStream ds = new DataInputStream(new ByteArrayInputStream(buf));
//
// Save decoded data to data output stream
//
if (dos != null) {
dos.writeInt(nSubrects);
dos.write(bg_buf);
dos.write(buf);
}
int sx, sy, sw, sh;
for (int j = 0; j < nSubrects; j++) {
if (bytesPerPixel == 1) {
pixel = getColor256()[ds.readUnsignedByte()];
} else {
ds.skip(4);
pixel = new Color(buf[j*12+2] & 0xFF,
buf[j*12+1] & 0xFF,
buf[j*12] & 0xFF);
}
sx = x + ds.readUnsignedShort();
sy = y + ds.readUnsignedShort();
sw = ds.readUnsignedShort();
sh = ds.readUnsignedShort();
graphics.setColor(pixel);
graphics.fillRect(sx, sy, sw, sh);
}
}
}
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