/// RefinementScan::WriteMCU
// Write a single MCU in this scan. Return true if there are more blocks in this row.
bool RefinementScan::WriteMCU(void)
{
bool more = true;
int c;
assert(m_pBlockCtrl);
BeginWriteMCU(m_bMeasure?NULL:m_Stream.ByteStreamOf());
for(c = 0;c < m_ucCount;c++) {
class Component *comp = m_pComponent[c];
class QuantizedRow *q = m_pBlockCtrl->CurrentQuantizedRow(comp->IndexOf());
class HuffmanCoder *ac = m_pACCoder[c];
class HuffmanStatistics *acstat = m_pACStatistics[c];
UWORD &skip = m_usSkip[c];
UBYTE mcux = (m_ucCount > 1)?(comp->MCUWidthOf() ):(1);
UBYTE mcuy = (m_ucCount > 1)?(comp->MCUHeightOf()):(1);
ULONG xmin = m_ulX[c];
ULONG xmax = xmin + mcux;
ULONG x,y;
if (xmax >= q->WidthOf()) {
more = false;
}
for(y = 0;y < mcuy;y++) {
for(x = xmin;x < xmax;x++) {
LONG *block,dummy[64];
if (q && x < q->WidthOf()) {
block = q->BlockAt(x)->m_Data;
} else {
block = dummy;
memset(dummy ,0,sizeof(dummy) );
}
if (m_bMeasure) {
MeasureBlock(block,acstat,skip);
} else {
EncodeBlock(block,ac,skip);
}
}
if (q) q = q->NextOf();
}
// Done with this component, advance the block.
m_ulX[c] = xmax;
}
return more;
}
/// SequentialScan::WriteMCU
// Write a single MCU in this scan. Return true if there are more blocks in this row.
bool SequentialScan::WriteMCU(void)
{
bool more = true;
int c;
assert(m_pBlockCtrl);
BeginWriteMCU(m_Stream.ByteStreamOf());
for(c = 0;c < m_ucCount;c++) {
class Component *comp = m_pComponent[c];
class QuantizedRow *q = m_pBlockCtrl->CurrentQuantizedRow(comp->IndexOf());
class HuffmanCoder *dc = m_pDCCoder[c];
class HuffmanCoder *ac = m_pACCoder[c];
class HuffmanStatistics *dcstat = m_pDCStatistics[c];
class HuffmanStatistics *acstat = m_pACStatistics[c];
LONG &prevdc = m_lDC[c];
UWORD &skip = m_usSkip[c];
UBYTE mcux = (m_ucCount > 1)?(comp->MCUWidthOf() ):(1);
UBYTE mcuy = (m_ucCount > 1)?(comp->MCUHeightOf()):(1);
ULONG xmin = m_ulX[c];
ULONG xmax = xmin + mcux;
ULONG x,y;
if (xmax >= q->WidthOf()) {
more = false;
}
for(y = 0;y < mcuy;y++) {
for(x = xmin;x < xmax;x++) {
LONG *block,dummy[64];
if (q && x < q->WidthOf()) {
block = q->BlockAt(x)->m_Data;
} else {
block = dummy;
memset(dummy ,0,sizeof(dummy) );
block[0] = prevdc;
}
#if HIERARCHICAL_HACK
// A nice hack for the hierarchical scan: If this is not the last frame
// in the hierarchy, remove all coefficients below the diagonal to allow a
// fast "EOB", they can be encoded by the level above.
if (m_pFrame->NextOf()) {
LONG i,j;
for(j = 0;j < 8;j++) {
for(i = 0;i < 8;i++) {
if (i+j > 4) {
block[i + (j << 3)] = 0;
}
}
}
}
#endif
if (m_bMeasure) {
MeasureBlock(block,dcstat,acstat,prevdc,skip);
} else {
EncodeBlock(block,dc,ac,prevdc,skip);
}
}
if (q) q = q->NextOf();
}
// Done with this component, advance the block.
m_ulX[c] = xmax;
}
return more;
}