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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2009-2017 Pierre Ossman for Cendio AB
*
* 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.
*/
#include <rdr/InStream.h>
#include <rdr/MemInStream.h>
#include <rdr/OutStream.h>
#include <rfb/ServerParams.h>
#include <rfb/PixelBuffer.h>
#include <rfb/ZRLEDecoder.h>
using namespace rfb;
static inline rdr::U32 readOpaque24A(rdr::InStream* is)
{
is->check(3);
rdr::U32 r=0;
((rdr::U8*)&r)[0] = is->readU8();
((rdr::U8*)&r)[1] = is->readU8();
((rdr::U8*)&r)[2] = is->readU8();
return r;
}
static inline rdr::U32 readOpaque24B(rdr::InStream* is)
{
is->check(3);
rdr::U32 r=0;
((rdr::U8*)&r)[1] = is->readU8();
((rdr::U8*)&r)[2] = is->readU8();
((rdr::U8*)&r)[3] = is->readU8();
return r;
}
#define BPP 8
#include <rfb/zrleDecode.h>
#undef BPP
#define BPP 16
#include <rfb/zrleDecode.h>
#undef BPP
#define BPP 32
#include <rfb/zrleDecode.h>
#define CPIXEL 24A
#include <rfb/zrleDecode.h>
#undef CPIXEL
#define CPIXEL 24B
#include <rfb/zrleDecode.h>
#undef CPIXEL
#undef BPP
ZRLEDecoder::ZRLEDecoder() : Decoder(DecoderOrdered)
{
}
ZRLEDecoder::~ZRLEDecoder()
{
}
void ZRLEDecoder::readRect(const Rect& r, rdr::InStream* is,
const ServerParams& server, rdr::OutStream* os)
{
rdr::U32 len;
len = is->readU32();
os->writeU32(len);
os->copyBytes(is, len);
}
void ZRLEDecoder::decodeRect(const Rect& r, const void* buffer,
size_t buflen, const ServerParams& server,
ModifiablePixelBuffer* pb)
{
rdr::MemInStream is(buffer, buflen);
const rfb::PixelFormat& pf = server.pf();
switch (pf.bpp) {
case 8: zrleDecode8 (r, &is, &zis, pf, pb); break;
case 16: zrleDecode16(r, &is, &zis, pf, pb); break;
case 32:
{
if (pf.depth <= 24) {
Pixel maxPixel = pf.pixelFromRGB((rdr::U16)-1, (rdr::U16)-1, (rdr::U16)-1);
bool fitsInLS3Bytes = maxPixel < (1<<24);
bool fitsInMS3Bytes = (maxPixel & 0xff) == 0;
if ((fitsInLS3Bytes && pf.isLittleEndian()) ||
(fitsInMS3Bytes && pf.isBigEndian()))
{
zrleDecode24A(r, &is, &zis, pf, pb);
break;
}
if ((fitsInLS3Bytes && pf.isBigEndian()) ||
(fitsInMS3Bytes && pf.isLittleEndian()))
{
zrleDecode24B(r, &is, &zis, pf, pb);
break;
}
}
zrleDecode32(r, &is, &zis, pf, pb);
break;
}
}
}
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