HEVC代码追踪（十一。八）:运动估计/补偿之xTZ8PointSquareSearch

__inline Void TEncSearch::xTZ8PointSquareSearch( TComPattern* pcPatternKey, IntTZSearchStruct& rcStruct, TComMv* pcMvSrchRngLT, TComMv* pcMvSrchRngRB, const Int iStartX, const Int iStartY, const Int iDist )
{
  Int   iSrchRngHorLeft   = pcMvSrchRngLT->getHor();
  Int   iSrchRngHorRight  = pcMvSrchRngRB->getHor();
  Int   iSrchRngVerTop    = pcMvSrchRngLT->getVer();
  Int   iSrchRngVerBottom = pcMvSrchRngRB->getVer();
  
  // 8 point search,                   //   1 2 3
  // search around the start point     //   4 0 5
  // with the required  distance       //   6 7 8
  assert( iDist != 0 );
  const Int iTop        = iStartY - iDist;
  const Int iBottom     = iStartY + iDist;
  const Int iLeft       = iStartX - iDist;
  const Int iRight      = iStartX + iDist;
  rcStruct.uiBestRound += 1;
  
  if ( iTop >= iSrchRngVerTop ) // check top
  {
    if ( iLeft >= iSrchRngHorLeft ) // check top left
    {
      xTZSearchHelp( pcPatternKey, rcStruct, iLeft, iTop, 1, iDist );
    }
    // top middle
    xTZSearchHelp( pcPatternKey, rcStruct, iStartX, iTop, 2, iDist );
    
    if ( iRight <= iSrchRngHorRight ) // check top right
    {
      xTZSearchHelp( pcPatternKey, rcStruct, iRight, iTop, 3, iDist );
    }
  } // check top
  if ( iLeft >= iSrchRngHorLeft ) // check middle left
  {
    xTZSearchHelp( pcPatternKey, rcStruct, iLeft, iStartY, 4, iDist );
  }
  if ( iRight <= iSrchRngHorRight ) // check middle right
  {
    xTZSearchHelp( pcPatternKey, rcStruct, iRight, iStartY, 5, iDist );
  }
  if ( iBottom <= iSrchRngVerBottom ) // check bottom
  {
    if ( iLeft >= iSrchRngHorLeft ) // check bottom left
    {
      xTZSearchHelp( pcPatternKey, rcStruct, iLeft, iBottom, 6, iDist );
    }
    // check bottom middle
    xTZSearchHelp( pcPatternKey, rcStruct, iStartX, iBottom, 7, iDist );
    
    if ( iRight <= iSrchRngHorRight ) // check bottom right
    {
      xTZSearchHelp( pcPatternKey, rcStruct, iRight, iBottom, 8, iDist );
    }
  } // check bottom
}