/* ofun -- piecewise-linear output-table mappings; inverse of xfun, yfun, zfun
*/
static fut_otbldat_t
ofun (fut_gtbldat_t q, fut_calcData_p dataP)
{
double p, delta, neutralgrid;
neutralgrid = ((fData_p) dataP)->neutralgrid;
p = DEQUANT (q, FUT_GRD_MAXVAL);
switch (((fData_p) dataP)->std.chan)
{
case 0: /* L* */
break;
case 1: /* a */
case 2: /* b */
delta = p - neutralgrid;
if (delta < 0.0)
p = ((fData_p) dataP)->neutralInput * (p / neutralgrid);
else
p = 1.0 - (1.0 - ((fData_p) dataP)->neutralInput) * ((1.0 - p) / (1.0 - neutralgrid));
break;
}
return QUANT (p, FUT_MAX_PEL12);
}
Void dequantizeBlock4x4(PixelI * pRec, Int * pOrg, const Int * pIndex, Int iQPLP)
{
Int i;
for(i = 1; i < 16; i ++)
pRec[pIndex[i]] = DEQUANT(pOrg[i], iQPLP);
}
Void dequantizeBlock4x2(PixelI * pRec, Int * pOrg, Int iQPLP)
{
pRec[ 64] = DEQUANT(pOrg[1], iQPLP);
pRec[ 16] = DEQUANT(pOrg[2], iQPLP);
pRec[ 80] = DEQUANT(pOrg[3], iQPLP);
pRec[ 32] = DEQUANT(pOrg[4], iQPLP);
pRec[ 96] = DEQUANT(pOrg[5], iQPLP);
pRec[ 48] = DEQUANT(pOrg[6], iQPLP);
pRec[112] = DEQUANT(pOrg[7], iQPLP);
}
Int dequantizeMacroblock(CWMImageStrCodec * pSC)
{
const COLORFORMAT cf = pSC->m_param.cfColorFormat;
CWMIMBInfo *pMBInfo = &pSC->MBInfo;
CWMITile * pTile = pSC->pTile + pSC->cTileColumn;
const size_t iChannels = pSC->m_param.cNumChannels;
size_t i;
for(i = 0; i < iChannels; i ++){
//dequantize DC
pSC->p1MBbuffer[i][0] = DEQUANT(pMBInfo->iBlockDC[i][0], pTile->pQuantizerDC[i]->iQP);
// dequantize LP
if(pSC->WMISCP.sbSubband != SB_DC_ONLY)
if(i == 0 || (cf != YUV_422 && cf != YUV_420))
dequantizeBlock4x4(pSC->p1MBbuffer[i] , pMBInfo->iBlockDC[i], dctIndex[2], pTile->pQuantizerLP[i][pMBInfo->iQIndexLP].iQP);
else if(cf == YUV_422)
dequantizeBlock4x2(pSC->p1MBbuffer[i], pMBInfo->iBlockDC[i], pTile->pQuantizerLP[i][pMBInfo->iQIndexLP].iQP);
else // 420
dequantizeBlock2x2(pSC->p1MBbuffer[i], pMBInfo->iBlockDC[i], pTile->pQuantizerLP[i][pMBInfo->iQIndexLP].iQP);
}
return ICERR_OK;
}
Void dequantizeBlock2x2(PixelI * pRec, Int * pOrg, Int iQPLP)
{
pRec[32] = DEQUANT(pOrg[1], iQPLP);
pRec[16] = DEQUANT(pOrg[2], iQPLP);
pRec[48] = DEQUANT(pOrg[3], iQPLP);
}
