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//
// Copyright (C) 2002 RealVNC Ltd. All Rights Reserved.
//
// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
//
//
// zrle.cc
//
// Routines to implement Zlib Run-length Encoding (ZRLE).
//
extern "C" {
#include "rfb.h"
}
#include <rdr/MemOutStream.h>
#include <rdr/ZlibOutStream.h>
#define GET_IMAGE_INTO_BUF(tx,ty,tw,th,buf) \
char *fbptr = (cl->screen->frameBuffer \
+ (cl->screen->paddedWidthInBytes * ty) \
+ (tx * (cl->screen->bitsPerPixel / 8))); \
\
(*cl->translateFn)(cl->translateLookupTable, &cl->screen->rfbServerFormat,\
&cl->format, fbptr, (char*)buf, \
cl->screen->paddedWidthInBytes, tw, th);
#define EXTRA_ARGS , rfbClientPtr cl
#define BPP 8
#include <zrleEncode.h>
#undef BPP
#define BPP 16
#include <zrleEncode.h>
#undef BPP
#define BPP 32
#include <zrleEncode.h>
#define CPIXEL 24A
#include <zrleEncode.h>
#undef CPIXEL
#define CPIXEL 24B
#include <zrleEncode.h>
#undef CPIXEL
#undef BPP
/*
* zrleBeforeBuf contains pixel data in the client's format. It must be at
* least one pixel bigger than the largest tile of pixel data, since the
* ZRLE encoding algorithm writes to the position one past the end of the pixel
* data.
*/
static char zrleBeforeBuf[rfbZRLETileWidth * rfbZRLETileHeight * 4 + 4];
static rdr::MemOutStream mos;
/*
* rfbSendRectEncodingZRLE - send a given rectangle using ZRLE encoding.
*/
Bool rfbSendRectEncodingZRLE(rfbClientPtr cl, int x, int y, int w, int h)
{
if (!cl->zrleData) cl->zrleData = new rdr::ZlibOutStream;
rdr::ZlibOutStream* zos = (rdr::ZlibOutStream*)cl->zrleData;
mos.clear();
switch (cl->format.bitsPerPixel) {
case 8:
zrleEncode8( x, y, w, h, &mos, zos, zrleBeforeBuf, cl);
break;
case 16:
zrleEncode16(x, y, w, h, &mos, zos, zrleBeforeBuf, cl);
break;
case 32:
bool fitsInLS3Bytes
= ((cl->format.redMax << cl->format.redShift) < (1<<24) &&
(cl->format.greenMax << cl->format.greenShift) < (1<<24) &&
(cl->format.blueMax << cl->format.blueShift) < (1<<24));
bool fitsInMS3Bytes = (cl->format.redShift > 7 &&
cl->format.greenShift > 7 &&
cl->format.blueShift > 7);
if ((fitsInLS3Bytes && !cl->format.bigEndian) ||
(fitsInMS3Bytes && cl->format.bigEndian))
{
zrleEncode24A(x, y, w, h, &mos, zos, zrleBeforeBuf, cl);
}
else if ((fitsInLS3Bytes && cl->format.bigEndian) ||
(fitsInMS3Bytes && !cl->format.bigEndian))
{
zrleEncode24B(x, y, w, h, &mos, zos, zrleBeforeBuf, cl);
}
else
{
zrleEncode32(x, y, w, h, &mos, zos, zrleBeforeBuf, cl);
}
break;
}
cl->rfbRectanglesSent[rfbEncodingZRLE]++;
cl->rfbBytesSent[rfbEncodingZRLE] += (sz_rfbFramebufferUpdateRectHeader
+ sz_rfbZRLEHeader + mos.length());
if (cl->ublen + sz_rfbFramebufferUpdateRectHeader + sz_rfbZRLEHeader
> UPDATE_BUF_SIZE)
{
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
rfbFramebufferUpdateRectHeader rect;
rect.r.x = Swap16IfLE(x);
rect.r.y = Swap16IfLE(y);
rect.r.w = Swap16IfLE(w);
rect.r.h = Swap16IfLE(h);
rect.encoding = Swap32IfLE(rfbEncodingZRLE);
memcpy(cl->updateBuf+cl->ublen, (char *)&rect,
sz_rfbFramebufferUpdateRectHeader);
cl->ublen += sz_rfbFramebufferUpdateRectHeader;
rfbZRLEHeader hdr;
hdr.length = Swap32IfLE(mos.length());
memcpy(cl->updateBuf+cl->ublen, (char *)&hdr, sz_rfbZRLEHeader);
cl->ublen += sz_rfbZRLEHeader;
// copy into updateBuf and send from there. Maybe should send directly?
for (int i = 0; i < mos.length();) {
int bytesToCopy = UPDATE_BUF_SIZE - cl->ublen;
if (i + bytesToCopy > mos.length()) {
bytesToCopy = mos.length() - i;
}
memcpy(cl->updateBuf+cl->ublen, (uint8_t*)mos.data() + i, bytesToCopy);
cl->ublen += bytesToCopy;
i += bytesToCopy;
if (cl->ublen == UPDATE_BUF_SIZE) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
}
return TRUE;
}
void FreeZrleData(rfbClientPtr cl)
{
delete (rdr::ZlibOutStream*)cl->zrleData;
}
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