void MvDataCodec::CodePredmode(const MvData& in_data)
{
int val = in_data.Mode()[b_yp][b_xp] - BlockModePrediction( in_data.Mode() );
if (val < 0)
val += 4; //produce value mod 4
for (int bin = 1; bin<= val; ++bin)
EncodeSymbol( 0 , ChoosePredContext( in_data , bin ) );
if (val != 3) //if we've had three zeroes, know we must have value 3
EncodeSymbol( 1 , ChoosePredContext( in_data , val + 1 ) );
}
void MvDataCodec::CodeMv2(const MvData& in_data)
{
const MvArray& mv_array = in_data.Vectors(2);
const MVector pred = Mv2Prediction( mv_array , in_data.Mode() );
const int valx = mv_array[b_yp][b_xp].x - pred.x;
const int abs_valx = abs(valx);
for (int bin = 1; bin <= abs_valx; ++bin)
EncodeSymbol( 0 , ChooseREF2xContext( in_data , bin ) );
EncodeSymbol( 1 , ChooseREF2xContext( in_data , abs_valx + 1 ) );
if (valx != 0)
EncodeSymbol( ( (valx > 0)? 1 : 0) , ChooseREF2xSignContext( in_data ) );
const int valy = mv_array[b_yp][b_xp].y-pred.y;
const int abs_valy = std::abs(valy);
for (int bin = 1; bin<=abs_valy; ++bin )
EncodeSymbol( 0 , ChooseREF2yContext( in_data , bin ) );
EncodeSymbol( 1 , ChooseREF2yContext( in_data , abs_valy + 1 ) );
if (valy != 0)
EncodeSymbol( ( (valy > 0)? 1 : 0) , ChooseREF2ySignContext( in_data ) );
}
void MvDataCodec::CodeDC(const MvData& in_data)
{
//begin with Y DC value
const ValueType valY = in_data.DC( Y_COMP )[b_yp][b_xp]
- DCPrediction( in_data.DC(Y_COMP) , in_data.Mode() );
const ValueType abs_valY = std::abs( valY );
for (ValueType bin = 1; bin <= abs_valY; ++bin)
EncodeSymbol( 0 , ChooseYDCContext( in_data , bin ) );
EncodeSymbol( 1 , ChooseYDCContext (in_data , abs_valY + 1 ) );
if (valY != 0)
EncodeSymbol( ( (valY > 0)? 1 : 0) , ChooseYDCSignContext( in_data ) );
//now do U and V if necessary
if (m_cformat != Yonly)
{
//continue with U and V DC values
const int valU = in_data.DC(U_COMP)[b_yp][b_xp]
- DCPrediction(in_data.DC( U_COMP ) , in_data.Mode());
const int abs_valU = std::abs( valU );
for (ValueType bin = 1; bin<=abs_valU ; ++bin)
EncodeSymbol( 0 , ChooseUDCContext( in_data , bin ) );
EncodeSymbol( 1 , ChooseUDCContext( in_data , abs_valU + 1 ) );
if (valU != 0)
EncodeSymbol( ( (valU > 0) ? 1 : 0) , ChooseUDCSignContext( in_data ) );
const int valV = in_data.DC( V_COMP )[b_yp][b_xp]
- DCPrediction( in_data.DC( V_COMP ) , in_data.Mode() );
const int abs_valV = std::abs( valV );
for (ValueType bin = 1; bin<=abs_valV ; ++bin)
EncodeSymbol( 0 , ChooseVDCContext( in_data , bin ) );
EncodeSymbol( 1 , ChooseVDCContext( in_data , abs_valV + 1 ) );
if (valV != 0)
EncodeSymbol( ( (valV > 0)? 1 : 0) , ChooseVDCSignContext( in_data ) );
}
}
void MvDataCodec::DecodePredmode( MvData& out_data )
{
int val = 0;
int bin = 1;
bool bit;
do
{
DecodeSymbol( bit , ChoosePredContext( out_data , bin ) );
if (!bit)
val++;
bin++;
}
while (!bit && val != 3);
out_data.Mode()[b_yp][b_xp] = PredMode( ( val + BlockModePrediction (out_data.Mode() ) ) %4);
}
void MvDataCodec::DecodeMv2( MvData& out_data )
{
MVector pred = Mv2Prediction( out_data.Vectors(2) , out_data.Mode() );
int val = 0;
int bin = 1;
bool bit;
do
{
DecodeSymbol( bit , ChooseREF2xContext( out_data , bin ) );
if ( !bit )
val++;
bin++;
}
while ( !bit );
if (val != 0)
{
DecodeSymbol( bit , ChooseREF2xSignContext( out_data ) );
if (!bit)
val = -val;
}
out_data.Vectors(2)[b_yp][b_xp].x = val + pred.x;
val = 0;
bin = 1;
do
{
DecodeSymbol( bit , ChooseREF2yContext( out_data , bin ) );
if ( !bit )
val++;
bin++;
}
while ( !bit );
if (val != 0)
{
DecodeSymbol( bit , ChooseREF2ySignContext( out_data ) );
if ( !bit )
val = -val;
}
out_data.Vectors(2)[b_yp][b_xp].y = val + pred.y;
}
// Main decode function
void PredModeCodec::DoWorkDecode( MvData& out_data)
{
int step,max;
int split_depth;
int xstart,ystart;
// Then the prediction mode
for (m_sb_yp = 0,m_sb_tlb_y = 0; m_sb_yp < out_data.SBSplit().LengthY(); ++m_sb_yp,m_sb_tlb_y += 4)
{
for (m_sb_xp = 0,m_sb_tlb_x = 0; m_sb_xp < out_data.SBSplit().LengthX(); ++m_sb_xp,m_sb_tlb_x += 4)
{
split_depth = out_data.SBSplit()[m_sb_yp][m_sb_xp];
step = 4 >> (split_depth);
max = (1 << split_depth);
//now do all the block mvs in the mb
for (int j = 0; j < max; ++j)
{
for (int i = 0; i < max; ++i)
{
xstart = m_b_xp = m_sb_tlb_x + i * step;
ystart = m_b_yp = m_sb_tlb_y + j * step;
DecodeVal(out_data);
// propagate throughout SB
for (m_b_yp = ystart; m_b_yp < ystart+step; m_b_yp++)
{
for (m_b_xp = xstart; m_b_xp < xstart+step; m_b_xp++)
{
out_data.Mode()[m_b_yp][m_b_xp] = out_data.Mode()[ystart][xstart];
}//m_b_xp
}//m_b_yp
}//i
}//j
}//m_sb_xp
}//m_sb_yp
}
void MotionCompensator::CompensateComponent( Picture* pic ,
Picture* refsptr[2] ,
const MvData& mv_data ,
const CompSort cs )
{
// Set up references to pictures and references
PicArray& pic_data_out = pic->Data( cs );
// Size of picture component being motion compensated
const PicArray& ref1up = refsptr[0]->UpData( cs );
const PicArray& ref2up = refsptr[1]->UpData( cs );
// Set up a row of blocks which will contain the MC data, which
// we'll add or subtract to pic_data_out
TwoDArray<ValueType> pic_data(m_bparams.Yblen(), pic_data_out.LengthX(), 0 );
// Factors to compensate for subsampling of chroma
int xscale_shift = 0;
int yscale_shift = 0;
if ( cs != Y_COMP )
{
if (m_cformat == format420)
{
xscale_shift = 1;
yscale_shift = 1;
}
else if (m_cformat == format422)
{
xscale_shift = 1;
yscale_shift = 0;
}
}
ImageCoords pic_size(pic->GetPparams().Xl(), pic->GetPparams().Yl());
if ( cs != Y_COMP )
{
pic_size.x = pic->GetPparams().ChromaXl();
pic_size.y = pic->GetPparams().ChromaYl();
}
// Reference to the relevant DC array
const TwoDArray<ValueType>& dcarray = mv_data.DC( cs );
// Set up references to the vectors
const int num_refs = pic->GetPparams().Refs().size();
const MvArray* mv_array1;
const MvArray* mv_array2;
mv_array1 = &mv_data.Vectors(1);
if (num_refs ==2 )
mv_array2 = &mv_data.Vectors(2);
else
mv_array2 = &mv_data.Vectors(1);
ReConfig();//set all the weighting blocks up
//Blocks are listed left to right, line by line.
MVector mv1,mv2;
PredMode block_mode;
//Coords of the top-left corner of a block
ImageCoords pos;
//Loop for each block in the output image.
//The CompensateBlock function will use the image pointed to by ref1up
//and add the compensated pixels to the image pointed to by pic_data.
size_t wgt_idx;
int save_from_row = m_bparams.Ybsep()-m_bparams.Yoffset();
// unpadded picture dimensions
const int x_end_data = pic_data_out.FirstX() + std::min(pic_data_out.LengthX(), pic_size.x );
const int y_end_data = pic_data_out.FirstY() + std::min(pic_data_out.LengthY(), pic_size.y );
const int blocks_per_mb_row = m_predparams.XNumBlocks()/m_predparams.XNumSB();
const int blocks_per_sb_row = blocks_per_mb_row>>1;
// The picture does not contain integral number of blocks. So not all
// blocks need to be processed. Compute the relevant blocks to be
// processed
int y_num_blocks = std::min((NUM_USED_BLKS(pic_size.y,m_bparams.Ybsep(),m_bparams.Yblen())),
m_predparams.YNumBlocks());
int x_num_blocks = std::min((NUM_USED_BLKS(pic_size.x,m_bparams.Xbsep(),m_bparams.Xblen())),
m_predparams.XNumBlocks());
//Loop over all the block rows
pos.y = -m_bparams.Yoffset();
for(int yblock = 0; yblock < y_num_blocks; ++yblock)
{
pos.x = -m_bparams.Xoffset();
int xincr, xb_incr = 0;
//loop over all the blocks in a row
for(int xblock = 0 ; xblock < x_num_blocks; xblock+=xb_incr)
{
int split_mode = mv_data.SBSplit()[yblock/blocks_per_mb_row][xblock/blocks_per_mb_row];
int blk_x, blk_y = 1;
switch (split_mode)
{
case 0: // processing superblock
blk_x = blocks_per_mb_row;
break;
case 1: // processing sub-superblock
blk_x = blocks_per_sb_row;
break;
case 2: // processing block
default:
blk_x = 1;
break;
}
//Decide which weights to use.
if (pos.x >=0 && (xblock+blk_x) < x_num_blocks)
{
// block is entirely within picture in x direction
if (pos.y < 0)
wgt_idx = 1;
else if ((yblock+blk_y) < y_num_blocks)
wgt_idx = 4;
else
wgt_idx = 7;
}
else if (pos.x < 0)
{
// left edge of block is outside picture in x direction
if (pos.y < 0)
wgt_idx = 0;
else if ((yblock+blk_y) < y_num_blocks)
wgt_idx = 3;
else
wgt_idx = 6;
}
else
{
// right edge of block is outside picture in x direction
if (pos.y < 0)
wgt_idx = 2;
else if ((yblock+blk_y) < y_num_blocks)
wgt_idx = 5;
else
wgt_idx = 8;
}
block_mode = mv_data.Mode()[yblock][xblock];
TwoDArray<ValueType> *wt;
if (split_mode == 0) //Block part of a MacroBlock
{
wt = &m_macro_block_weights[wgt_idx];
xb_incr = blocks_per_mb_row;
}
else if (split_mode == 1) //Block part of a SubBlock
{
wt = &m_sub_block_weights[wgt_idx];
xb_incr = blocks_per_sb_row;
}
else
{
wt = &m_block_weights[wgt_idx];
xb_incr = 1;
}
xincr = m_bparams.Xbsep() * xb_incr;
mv1 = (*mv_array1)[yblock][xblock];
mv1.x >>= xscale_shift;
mv1.y >>= yscale_shift;
mv2 = (*mv_array2)[yblock][xblock];
mv2.x >>= xscale_shift;
mv2.y >>= yscale_shift;
CompensateBlock(pic_data, pos, pic_size, block_mode, dcarray[yblock][xblock], ref1up, mv1, ref2up, mv2, *wt);
//Increment the block horizontal position
pos.x += xincr;
}//xblock
// Update the pic data
// Use only the first Ybsep rows since the remaining rows are
// needed for the next row of blocks since we are using overlapped
// blocks motion compensation
if (m_add_or_sub == SUBTRACT)
{
int start_y = std::max(pic_data_out.FirstY() , pos.y) ;
int end_y = std::min (pic_data_out.FirstY() + pos.y + m_bparams.Ybsep() , y_end_data);
if (yblock == y_num_blocks - 1)
{
end_y = pic_data_out.LengthY();
if (end_y > y_end_data)
end_y = y_end_data;
}
for ( int i = start_y, pos_y = 0; i < end_y; i++, pos_y++)
{
ValueType *pic_row = pic_data[pos_y];
ValueType *out_row = pic_data_out[i];
for ( int j =pic_data_out.FirstX(); j < x_end_data; ++j)
{
out_row[j] -= static_cast<ValueType>( (pic_row[j] + 32) >> 6 );
}
// Okay, we've done all the actual blocks. Now if the picture is further padded
// we need to set the padded values to zero beyond the last block in the row,
// for all the picture lines in the block row. Need only do this when we're
// subtracting.
for (int j=pic_size.x; j<pic_data_out.LengthX() ; ++j )
{
out_row[pic_data_out.FirstX()+j] = 0;
}
}
}
else // (m_add_or_sub == ADD)
{
void MvDataCodec::DecodeDC( MvData& out_data )
{
//begin with Y DC value
ValueType val = 0;
int bin = 1;
bool bit;
do
{
DecodeSymbol( bit , ChooseYDCContext( out_data , bin ) );
if ( !bit )
val++;
bin++;
}
while ( !bit );
if (val != 0)
{
DecodeSymbol( bit , ChooseYDCSignContext( out_data ) );
if (!bit)
val = -val;
}
out_data.DC( Y_COMP )[b_yp][b_xp] = val + DCPrediction( out_data.DC( Y_COMP ) , out_data.Mode());
if (m_cformat != Yonly)
{
//move onto U and V DC values
val = 0;
bin = 1;
do
{
DecodeSymbol( bit , ChooseUDCContext( out_data , bin ) );
if (!bit)
val++;
bin++;
}
while (!bit);
if (val != 0)
{
DecodeSymbol( bit , ChooseUDCSignContext ( out_data ) );
if (!bit)
val = -val;
}
out_data.DC( U_COMP )[b_yp][b_xp] = val + DCPrediction( out_data.DC( U_COMP ) , out_data.Mode());
val = 0;
bin = 1;
do
{
DecodeSymbol( bit , ChooseVDCContext( out_data , bin ) );
if ( !bit )
val++;
bin++;
}
while ( !bit );
if (val != 0)
{
DecodeSymbol( bit , ChooseVDCSignContext( out_data ) );
if ( !bit )
val = -val;
}
out_data.DC( V_COMP )[b_yp][b_xp] = val + DCPrediction( out_data.DC( V_COMP ) , out_data.Mode() );
}
}
void MvDataCodec::DoWorkDecode( MvData& out_data, int num_bits)
{
int step,max;
int pstep,pmax;
int split_depth;
bool common_ref;
int xstart,ystart;
for (mb_yp = 0,mb_tlb_y = 0; mb_yp < out_data.MBSplit().LengthY(); ++mb_yp,mb_tlb_y += 4)
{
for (mb_xp = 0,mb_tlb_x = 0; mb_xp < out_data.MBSplit().LengthX(); ++mb_xp,mb_tlb_x += 4)
{
//start with split mode
DecodeMBSplit( out_data );
split_depth = out_data.MBSplit()[mb_yp][mb_xp];
step = 4 >> (split_depth);
max = (1 << split_depth);
//next do common_ref
if(split_depth != 0)
{
DecodeMBCom( out_data );
pstep = step;
pmax = max;
}
else
{
out_data.MBCommonMode()[mb_yp][mb_xp] = true;
pstep = 4;
pmax = 1;
}
common_ref = out_data.MBCommonMode()[mb_yp][mb_xp];
// do prediction modes
for (b_yp = mb_tlb_y; b_yp < mb_tlb_y + 4; b_yp += pstep)
{
for (b_xp = mb_tlb_x; b_xp < mb_tlb_x + 4; b_xp += pstep)
{
DecodePredmode(out_data);
// propagate throughout MB
for (int y = b_yp; y < b_yp + pstep; y++)
for (int x = b_xp; x < b_xp + pstep; x++)
out_data.Mode()[y][x] = out_data.Mode()[b_yp][b_xp];
}
}
//now do all the block mvs in the mb
for (int j = 0; j < max; ++j)
{
for (int i = 0; i < max; ++i)
{
xstart = b_xp = mb_tlb_x + i * step;
ystart = b_yp = mb_tlb_y + j * step;
if (out_data.Mode()[b_yp][b_xp] == REF1_ONLY || out_data.Mode()[b_yp][b_xp] == REF1AND2 )
DecodeMv1( out_data );
if (out_data.Mode()[b_yp][b_xp] == REF2_ONLY || out_data.Mode()[b_yp][b_xp] == REF1AND2 )
DecodeMv2( out_data );
if(out_data.Mode()[b_yp][b_xp] == INTRA)
DecodeDC( out_data );
//propagate throughout MB
for (b_yp = ystart; b_yp < ystart+step; b_yp++)
{
for (b_xp = xstart; b_xp < xstart+step; b_xp++)
{
out_data.Vectors(1)[b_yp][b_xp].x = out_data.Vectors(1)[ystart][xstart].x;
out_data.Vectors(1)[b_yp][b_xp].y = out_data.Vectors(1)[ystart][xstart].y;
out_data.Vectors(2)[b_yp][b_xp].x = out_data.Vectors(2)[ystart][xstart].x;
out_data.Vectors(2)[b_yp][b_xp].y = out_data.Vectors(2)[ystart][xstart].y;
out_data.DC( Y_COMP )[b_yp][b_xp] = out_data.DC( Y_COMP )[ystart][xstart];
out_data.DC( U_COMP )[b_yp][b_xp] = out_data.DC( U_COMP )[ystart][xstart];
out_data.DC( V_COMP )[b_yp][b_xp] = out_data.DC( V_COMP )[ystart][xstart];
}//b_xp
}//b_yp
}//i
}//j
}//mb_xp
}//mb_yp
}
void MvDataCodec::DoWorkCode( MvData& in_data )
{
int step,max;
int pstep,pmax;
int split_depth;
bool common_ref;
MB_count = 0;
for (mb_yp = 0, mb_tlb_y = 0; mb_yp < in_data.MBSplit().LengthY(); ++mb_yp, mb_tlb_y += 4)
{
for (mb_xp = 0,mb_tlb_x = 0; mb_xp < in_data.MBSplit().LengthX(); ++mb_xp,mb_tlb_x += 4)
{
//start with split mode
CodeMBSplit(in_data);
split_depth = in_data.MBSplit()[mb_yp][mb_xp];
step = 4 >> (split_depth);
max = (1 << split_depth);
//next do common_ref
if(split_depth != 0)
{
CodeMBCom(in_data);
pstep = step;
pmax = max;
}
else
{
pstep = 4;
pmax = 1;
}
common_ref = in_data.MBCommonMode()[mb_yp][mb_xp];
//do prediction modes
for (b_yp = mb_tlb_y; b_yp < mb_tlb_y+4; b_yp += pstep)
for (b_xp = mb_tlb_x; b_xp < mb_tlb_x+4; b_xp += pstep)
CodePredmode(in_data);
step = 4 >> (split_depth);
//now do all the block mvs in the mb
for (b_yp = mb_tlb_y; b_yp < mb_tlb_y+4; b_yp += step)
{
for (b_xp = mb_tlb_x; b_xp < mb_tlb_x+4; b_xp += step)
{
if (in_data.Mode()[b_yp][b_xp] == REF1_ONLY || in_data.Mode()[b_yp][b_xp] == REF1AND2 )
CodeMv1(in_data);
if (in_data.Mode()[b_yp][b_xp] == REF2_ONLY || in_data.Mode()[b_yp][b_xp] == REF1AND2 )
CodeMv2(in_data);
if(in_data.Mode()[b_yp][b_xp] == INTRA)
CodeDC(in_data);
}//b_xp
}//b_yp
//TODO: Update all contexts here?
}//mb_xp
}//mb_yp
}
void MotionCompensator::CompensateComponent(Frame& picframe, const Frame &ref1frame, const Frame& ref2frame,
const MvData& mv_data,const CompSort cs)
{
// Set up references to pictures and references
PicArray& pic_data_out = picframe.Data( cs );
const PicArray& ref1up = ref1frame.UpData( cs );
const PicArray& ref2up = ref2frame.UpData( cs );
// Set up another picture which will contain the MC data, which
// we'll add or subtract to pic_data_out
TwoDArray<CalcValueType> pic_data(pic_data_out.LengthY(), pic_data_out.LengthX() , 0);
// Factors to compensate for subsampling of chroma
int xscale_factor = 1;
int yscale_factor = 1;
if ( cs != Y_COMP )
{
if (m_cformat == format420)
{
xscale_factor = 2;
yscale_factor = 2;
}
else if (m_cformat == format422)
{
xscale_factor = 2;
yscale_factor = 1;
}
else if (m_cformat == format411)
{
xscale_factor = 4;
yscale_factor = 1;
}
}
// Reference to the relevant DC array
const TwoDArray<ValueType>& dcarray = mv_data.DC( cs );
// Set up references to the vectors
const int num_refs = picframe.GetFparams().Refs().size();
const MvArray* mv_array1;
const MvArray* mv_array2;
mv_array1 = &mv_data.Vectors(1);
if (num_refs ==2 )
mv_array2 = &mv_data.Vectors(2);
else
mv_array2 = &mv_data.Vectors(1);
ReConfig();//set all the weighting blocks up
//Blocks are listed left to right, line by line.
MVector mv1,mv2;
PredMode block_mode;
ValueType dc;
//Coords of the top-left corner of a block
ImageCoords pos;
//Loop for each block in the output image.
//The CompensateBlock function will use the image pointed to by ref1up
//and add the compensated pixels to the image pointed to by pic_data.
size_t wgt_idx;
//Loop over all the block rows
pos.y = -m_bparams.Yoffset();
for(int yblock = 0; yblock < m_cparams.YNumBlocks(); ++yblock)
{
pos.x = -m_bparams.Xoffset();
//loop over all the blocks in a row
for(int xblock = 0 ; xblock < m_cparams.XNumBlocks(); ++xblock)
{
//Decide which weights to use.
if((xblock != 0)&&(xblock < m_cparams.XNumBlocks() - 1))
{
if((yblock != 0)&&(yblock < m_cparams.YNumBlocks() - 1))
wgt_idx = 4;
else if(yblock == 0)
wgt_idx = 1;
else
wgt_idx= 7;
}
else if(xblock == 0)
{
if((yblock != 0)&&(yblock < m_cparams.YNumBlocks() - 1))
wgt_idx = 3;
else if(yblock == 0)
wgt_idx = 0;
else
wgt_idx = 6;
}
else
{
if((yblock != 0)&&(yblock < m_cparams.YNumBlocks() - 1))
wgt_idx = 5;
else if(yblock == 0)
wgt_idx = 2;
else
wgt_idx = 8;
}
block_mode = mv_data.Mode()[yblock][xblock];
mv1 = (*mv_array1)[yblock][xblock];
mv1.x /= xscale_factor;
mv1.y /= yscale_factor;
mv2 = (*mv_array2)[yblock][xblock];
mv2.x /= xscale_factor;
mv2.y /= yscale_factor;
dc = dcarray[yblock][xblock]<<2;// DC is only given 8 bits,
// so need to shift to get 10-bit data
if(block_mode == REF1_ONLY)
{
CompensateBlock(pic_data, ref1up, mv1, pos, m_block_weights[wgt_idx]);
}
else if (block_mode == REF2_ONLY)
{
CompensateBlock(pic_data, ref2up, mv2, pos, m_block_weights[wgt_idx]);
}
else if(block_mode == REF1AND2)
{
CompensateBlock(pic_data, ref1up, mv1, pos, m_half_block_weights[wgt_idx]);
CompensateBlock(pic_data, ref2up, mv2, pos, m_half_block_weights[wgt_idx]);
}
else
{//we have a DC block.
DCBlock(pic_data, dc,pos, m_block_weights[wgt_idx]);
}
//Increment the block horizontal position
pos.x += m_bparams.Xbsep();
}//xblock
//Increment the block vertical position
pos.y += m_bparams.Ybsep();
}//yblock
if ( m_add_or_sub == SUBTRACT)
{
int x_end_data = std::min(pic_data.LastX(), m_cparams.XNumBlocks()*m_bparams.Xbsep() );
int y_end_data = std::min(pic_data.LastY(), m_cparams.YNumBlocks()*m_bparams.Ybsep() );
for ( int i =pic_data.FirstY(); i <= y_end_data; i++)
{
for ( int j =pic_data.FirstX(); j <= x_end_data; ++j)
{
pic_data_out[i][j] -= static_cast<ValueType>( (pic_data[i][j] + 1024) >> 11 );
}
// Okay, we've done all the actual blocks. Now if the picture is further padded
// we need to set the padded values to zero beyond the last block in the row,
// for all the picture lines in the block row. Need only do this when we're
// subtracting.
for (int j=( m_cparams.XNumBlocks()*m_bparams.Xbsep() ); j<pic_data.LengthX() ; ++j )
{
pic_data_out[i][j] = 0;
}
}
// Finally, now we've done all the blocks, we must set all padded lines below
// the last row equal to 0, if we're subtracting
for ( int y=m_cparams.YNumBlocks()*m_bparams.Ybsep() ; y<pic_data.LengthY() ; ++y )
{
for ( int x=0 ; x<pic_data.LengthX() ; ++x )
{
pic_data_out[y][x] = 0;
}
}
}