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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2016-2019 Brian P. Hinz
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
package com.tigervnc.rfb;
import java.nio.*;
import com.tigervnc.rdr.*;
public class RREDecoder extends Decoder {
public RREDecoder() { super(DecoderFlags.DecoderPlain); }
public void readRect(Rect r, InStream is,
ServerParams server, OutStream os)
{
int numRects;
numRects = is.readU32();
os.writeU32(numRects);
os.copyBytes(is, server.pf().bpp/8 + numRects * (server.pf().bpp/8 + 8));
}
public void decodeRect(Rect r, Object buffer,
int buflen, ServerParams server,
ModifiablePixelBuffer pb)
{
MemInStream is = new MemInStream((byte[])buffer, 0, buflen);
PixelFormat pf = server.pf();
switch (pf.bpp) {
case 8: rreDecode8 (r, is, pf, pb); break;
case 16: rreDecode16(r, is, pf, pb); break;
case 32: rreDecode32(r, is, pf, pb); break;
}
}
private static ByteBuffer READ_PIXEL(InStream is, PixelFormat pf) {
ByteBuffer b = ByteBuffer.allocate(4);
switch (pf.bpp) {
case 8:
b.putInt(is.readOpaque8());
return ByteBuffer.allocate(1).put(b.get(3));
case 16:
b.putInt(is.readOpaque16());
return ByteBuffer.allocate(2).put(b.array(), 2, 2);
case 32:
default:
b.putInt(is.readOpaque32());
return b;
}
}
private void RRE_DECODE(Rect r, InStream is,
PixelFormat pf, ModifiablePixelBuffer pb)
{
int nSubrects = is.readU32();
byte[] bg = READ_PIXEL(is, pf).array();
pb.fillRect(pf, r, bg);
for (int i = 0; i < nSubrects; i++) {
byte[] pix = READ_PIXEL(is, pf).array();
int x = is.readU16();
int y = is.readU16();
int w = is.readU16();
int h = is.readU16();
pb.fillRect(pf, new Rect(r.tl.x+x, r.tl.y+y, r.tl.x+x+w, r.tl.y+y+h), pix);
}
}
private void rreDecode8(Rect r, InStream is,
PixelFormat pf,
ModifiablePixelBuffer pb)
{
RRE_DECODE(r, is, pf, pb);
}
private void rreDecode16(Rect r, InStream is,
PixelFormat pf,
ModifiablePixelBuffer pb)
{
RRE_DECODE(r, is, pf, pb);
}
private void rreDecode32(Rect r, InStream is,
PixelFormat pf,
ModifiablePixelBuffer pb)
{
RRE_DECODE(r, is, pf, pb);
}
}
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