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https://github.com/kasmtech/KasmVNC.git
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120 lines
3.1 KiB
C++
120 lines
3.1 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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* Copyright 2009-2017 Pierre Ossman for Cendio AB
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <rdr/InStream.h>
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#include <rdr/MemInStream.h>
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#include <rdr/OutStream.h>
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#include <rfb/ConnParams.h>
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#include <rfb/PixelBuffer.h>
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#include <rfb/ZRLEDecoder.h>
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using namespace rfb;
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static inline rdr::U32 readOpaque24A(rdr::InStream* is)
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{
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is->check(3);
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rdr::U32 r=0;
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((rdr::U8*)&r)[0] = is->readU8();
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((rdr::U8*)&r)[1] = is->readU8();
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((rdr::U8*)&r)[2] = is->readU8();
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return r;
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}
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static inline rdr::U32 readOpaque24B(rdr::InStream* is)
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{
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is->check(3);
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rdr::U32 r=0;
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((rdr::U8*)&r)[1] = is->readU8();
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((rdr::U8*)&r)[2] = is->readU8();
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((rdr::U8*)&r)[3] = is->readU8();
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return r;
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}
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#define BPP 8
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#include <rfb/zrleDecode.h>
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#undef BPP
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#define BPP 16
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#include <rfb/zrleDecode.h>
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#undef BPP
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#define BPP 32
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#include <rfb/zrleDecode.h>
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#define CPIXEL 24A
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#include <rfb/zrleDecode.h>
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#undef CPIXEL
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#define CPIXEL 24B
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#include <rfb/zrleDecode.h>
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#undef CPIXEL
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#undef BPP
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ZRLEDecoder::ZRLEDecoder() : Decoder(DecoderOrdered)
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{
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}
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ZRLEDecoder::~ZRLEDecoder()
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{
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}
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void ZRLEDecoder::readRect(const Rect& r, rdr::InStream* is,
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const ConnParams& cp, rdr::OutStream* os)
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{
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rdr::U32 len;
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len = is->readU32();
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os->writeU32(len);
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os->copyBytes(is, len);
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}
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void ZRLEDecoder::decodeRect(const Rect& r, const void* buffer,
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size_t buflen, const ConnParams& cp,
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ModifiablePixelBuffer* pb)
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{
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rdr::MemInStream is(buffer, buflen);
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const rfb::PixelFormat& pf = cp.pf();
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switch (pf.bpp) {
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case 8: zrleDecode8 (r, &is, &zis, pf, pb); break;
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case 16: zrleDecode16(r, &is, &zis, pf, pb); break;
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case 32:
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{
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if (pf.depth <= 24) {
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Pixel maxPixel = pf.pixelFromRGB((rdr::U16)-1, (rdr::U16)-1, (rdr::U16)-1);
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bool fitsInLS3Bytes = maxPixel < (1<<24);
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bool fitsInMS3Bytes = (maxPixel & 0xff) == 0;
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if ((fitsInLS3Bytes && pf.isLittleEndian()) ||
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(fitsInMS3Bytes && pf.isBigEndian()))
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{
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zrleDecode24A(r, &is, &zis, pf, pb);
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break;
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}
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if ((fitsInLS3Bytes && pf.isBigEndian()) ||
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(fitsInMS3Bytes && pf.isLittleEndian()))
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{
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zrleDecode24B(r, &is, &zis, pf, pb);
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break;
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}
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}
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zrleDecode32(r, &is, &zis, pf, pb);
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break;
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}
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}
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}
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