/**
* Closes the Mutex
*
* @param It wont take any prameters
*
* @return Returns the Error whether it is success or failure
*incase of failure it will return what is the specific error
*/
OSCL_EXPORT_REF OsclProcStatus::eOsclProcError OsclMutex::Close()
{
if (!bCreated)
return OsclProcStatus::INVALID_OPERATION_ERROR;
int result = pthread_mutex_destroy(&ObjMutex);
if (result == 0)
{
bCreated = false;
return OsclProcStatus::SUCCESS_ERROR;
}
else
return ErrorMapping(result);
}
/*
* Creates the Mutex
*
* @param MutexName NULL terminated string.
*
* @return Returns the Error whether it is success or failure
*incase of failure it will return what is the specific error
*/
OSCL_EXPORT_REF OsclProcStatus::eOsclProcError OsclMutex::Create()
{
if (bCreated)
return OsclProcStatus::INVALID_OPERATION_ERROR;
int result = pthread_mutex_init(&ObjMutex, NULL);
if (result == 0)
{
bCreated = true;
return OsclProcStatus::SUCCESS_ERROR;
}
else
return ErrorMapping(result);
}
/**
* Try to lock the mutex,if the Mutex is already locked calling thread
* immediately returns with out blocking
* @param It wont take any parameters
*
* @return Returns the Error whether it is success or failure
*incase of failure it will return what is the specific error
*/
OSCL_EXPORT_REF OsclProcStatus::eOsclProcError OsclMutex::TryLock()
{
if (!bCreated)
return OsclProcStatus::INVALID_OPERATION_ERROR;
int result = pthread_mutex_trylock(&ObjMutex);
switch (result)
{
case 0:
return OsclProcStatus::SUCCESS_ERROR;
case EBUSY:
return OsclProcStatus::MUTEX_LOCKED_ERROR;
default:
return ErrorMapping(result);
}
}
/// SingleComponentLSScan::WriteMCU
// Write a single MCU in this scan.
bool SingleComponentLSScan::WriteMCU(void)
{
#if ACCUSOFT_CODE
int lines = m_ulRemaining[0]; // total number of MCU lines processed.
UBYTE preshift = m_ucLowBit + FractionalColorBitsOf();
struct Line *line = CurrentLine(0);
assert(m_ucCount == 1);
//
// A "MCU" in respect to the code organization is eight lines.
if (lines > 8) {
lines = 8;
}
m_ulRemaining[0] -= lines;
assert(lines > 0);
// Loop over lines and columns
do {
LONG length = m_ulWidth[0];
LONG *lp = line->m_pData;
BeginWriteMCU(m_Stream.ByteStreamOf()); // MCU is a single line.
StartLine(0);
do {
LONG a,b,c,d,x; // neighbouring values.
LONG d1,d2,d3; // local gradients.
GetContext(0,a,b,c,d);
x = *lp >> preshift;
d1 = d - b; // compute local gradients
d2 = b - c;
d3 = c - a;
if (isRunMode(d1,d2,d3)) {
LONG runval = a;
LONG runcnt = 0;
do {
x = *lp >> preshift;
if (x - runval < -m_lNear || x - runval > m_lNear)
break;
// Update so that the next process gets the correct value.
// Also updates the line pointers.
UpdateContext(0,runval);
} while(lp++,runcnt++,--length);
// Encode the run. Depends on whether the run was interrupted
// by the end of the line.
EncodeRun(runcnt,length == 0,m_lRunIndex[0]);
// Continue the encoding of the end of the run if there are more
// samples to encode.
if (length) {
bool negative; // the sign variable
bool rtype; // run interruption type
LONG errval; // the prediction error
LONG merr; // the mapped error (symbol)
LONG rx; // the reconstructed value
UBYTE k; // golomb parameter
// Get the neighbourhood.
GetContext(0,a,b,c,d);
// Get the prediction mode.
rtype = InterruptedPredictionMode(negative,a,b);
// Compute the error value.
errval = x - ((rtype)?(a):(b));
if (negative)
errval = -errval;
// Quantize the error.
errval = QuantizePredictionError(errval);
// Compute the reconstructed value.
rx = Reconstruct(negative,rtype?a:b,errval);
// Update so that the next process gets the correct value.
UpdateContext(0,rx);
// Get the golomb parameter for run interruption coding.
k = GolombParameter(rtype);
// Map the error into a symbol.
merr = ErrorMapping(errval,ErrorMappingOffset(rtype,errval != 0,k)) - rtype;
// Golomb-coding of the error.
GolombCode(k,merr,m_lLimit - m_lJ[m_lRunIndex[0]] - 1);
// Update the variables of the run mode.
UpdateState(rtype,errval);
// Update the run index now. This is not part of
// EncodeRun because the non-reduced run-index is
// required for the golomb coder length limit.
if (m_lRunIndex[0] > 0)
m_lRunIndex[0]--;
} else break; // Line ended, abort the loop over the line.
} else {
UWORD ctxt;
bool negative; // the sign variable.
LONG px; // the predicted variable.
LONG rx; // the reconstructed value.
LONG errval; // the error value.
LONG merr; // the mapped error value.
UBYTE k; // the Golomb parameter.
// Quantize the gradients.
d1 = QuantizedGradient(d1);
d2 = QuantizedGradient(d2);
d3 = QuantizedGradient(d3);
// Compute the context.
ctxt = Context(negative,d1,d2,d3);
// Compute the predicted value.
px = Predict(a,b,c);
// Correct the prediction.
px = CorrectPrediction(ctxt,negative,px);
// Compute the error value.
errval = x - px;
if (negative)
errval = -errval;
// Quantize the prediction error if NEAR > 0
errval = QuantizePredictionError(errval);
// Compute the reconstructed value.
rx = Reconstruct(negative,px,errval);
// Update so that the next process gets the correct value.
UpdateContext(0,rx);
// Compute the golomb parameter k from the context.
k = GolombParameter(ctxt);
// Map the error into a symbol
merr = ErrorMapping(errval,ErrorMappingOffset(ctxt,k));
// Golomb-coding of the error.
GolombCode(k,merr,m_lLimit);
// Update the variables.
UpdateState(ctxt,errval);
}
} while(++lp,--length);
EndLine(0);
line = line->m_pNext;
} while(--lines);
