rfb/HextileEncoder.cxx

/* Copyright (C) 2002-2004 RealVNC Ltd.  All Rights Reserved.
 * Copyright (C) 2005 Constantin Kaplinsky.  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.
 */
#include <rfb/ImageGetter.h>
#include <rfb/encodings.h>
#include <rfb/SMsgWriter.h>
#include <rfb/HextileEncoder.h>
#include <rfb/Configuration.h>

using namespace rfb;

BoolParameter improvedHextile("ImprovedHextile",
                              "Use improved compression algorithm for Hextile "
                              "encoding which achieves better compression "
                              "ratios by the cost of using more CPU time",
                              false);

#define EXTRA_ARGS ImageGetter* ig
#define GET_IMAGE_INTO_BUF(r,buf) ig->getImage(buf, r);
#define BPP 8
#include <rfb/hextileEncodeBetter.h>
#undef BPP
#define BPP 16
#include <rfb/hextileEncode.h>
#include <rfb/hextileEncodeBetter.h>
#undef BPP
#define BPP 32
#include <rfb/hextileEncode.h>
#include <rfb/hextileEncodeBetter.h>
#undef BPP

Encoder* HextileEncoder::create(SMsgWriter* writer)
{
  return new HextileEncoder(writer);
}

HextileEncoder::HextileEncoder(SMsgWriter* writer_) : writer(writer_)
{
}

HextileEncoder::~HextileEncoder()
{
}

bool HextileEncoder::writeRect(const Rect& r, ImageGetter* ig, Rect* actual)
{
  writer->startRect(r, encodingHextile);
  rdr::OutStream* os = writer->getOutStream();
  switch (writer->bpp()) {
  case 8:
    // NOTE: We always use improved Hextile for 8-bit data.
    hextileEncodeBetter8(r, os, ig);
    break;
  case 16:
    if (improvedHextile) {
      hextileEncodeBetter16(r, os, ig);
    } else {
      hextileEncode16(r, os, ig);
    }
    break;
  case 32:
    if (improvedHextile) {
      hextileEncodeBetter32(r, os, ig);
    } else {
      hextileEncode32(r, os, ig);
    }
    break;
  }
  writer->endRect();
  return true;
}