Fix for Ticket #561 - RPR

  - Incorrect clipping at picture border and insufficient picture buffer margin.

source/Lib/CommonLib/InterPrediction.cpp

@@ -2415,7 +2415,7 @@ bool InterPrediction::xPredInterBlkRPR( const std::pair<int, int>& scalingRatio,
     {
       int posX = (int32_t)x0Int + col * stepX;
       xInt = ( posX + offX ) >> posShift;
-      xInt = std::min( std::max( 0, xInt ), ( refPicWidth >> ::getComponentScaleX( compID, chFmt ) ) );
+      xInt = std::min( std::max( -4, xInt ), ( refPicWidth >> ::getComponentScaleX( compID, chFmt ) ) + 4 );
       int xFrac = ( ( posX + offX ) >> ( posShift - shiftHor ) ) & ( ( 1 << shiftHor ) - 1 );
 
       CHECK( xInt0 > xInt, "Wrong horizontal starting point" );
@@ -2435,7 +2435,7 @@ bool InterPrediction::xPredInterBlkRPR( const std::pair<int, int>& scalingRatio,
     {
       int posY = (int32_t)y0Int + row * stepY;
       yInt = ( posY + offY ) >> posShift;
-      yInt = std::min( std::max( 0, yInt ), ( refPicHeight >> ::getComponentScaleY( compID, chFmt ) ) );
+      yInt = std::min( std::max( -4, yInt ), ( refPicHeight >> ::getComponentScaleY( compID, chFmt ) ) + 4 );
       int yFrac = ( ( posY + offY ) >> ( posShift - shiftVer ) ) & ( ( 1 << shiftVer ) - 1 );
 
       CHECK( yInt0 > yInt, "Wrong vertical starting point" );

source/Lib/CommonLib/Picture.cpp

@@ -806,10 +806,10 @@ Picture::Picture()
 void Picture::create(const ChromaFormat &_chromaFormat, const Size &size, const unsigned _maxCUSize, const unsigned _margin, const bool _decoder)
 {
   UnitArea::operator=( UnitArea( _chromaFormat, Area( Position{ 0, 0 }, size ) ) );
-  margin            =  _margin;
+  margin            =  MAX_SCALING_RATIO*_margin;
   const Area a      = Area( Position(), size );
-  M_BUFS( 0, PIC_RECONSTRUCTION ).create( _chromaFormat, a, _maxCUSize, _margin, MEMORY_ALIGN_DEF_SIZE );
-  M_BUFS( 0, PIC_RECON_WRAP ).create( _chromaFormat, a, _maxCUSize, _margin, MEMORY_ALIGN_DEF_SIZE );
+  M_BUFS( 0, PIC_RECONSTRUCTION ).create( _chromaFormat, a, _maxCUSize, MAX_SCALING_RATIO*_margin, MEMORY_ALIGN_DEF_SIZE );
+  M_BUFS( 0, PIC_RECON_WRAP ).create( _chromaFormat, a, _maxCUSize, MAX_SCALING_RATIO*_margin, MEMORY_ALIGN_DEF_SIZE );
 
   if( !_decoder )
   {