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src/Source/LibJXR/image/decode/strdec.c  view on Meta::CPAN

//================================================================
Int readIndexTable(CWMImageStrCodec * pSC)
{
    BitIOInfo* pIO = pSC->pIOHeader;
    readIS_L1(pSC, pIO);

    if(pSC->cNumBitIO > 0){
        size_t *pTable = pSC->pIndexTable;
        U32 iEntry = (U32)pSC->cNumBitIO * (pSC->WMISCP.cNumOfSliceMinus1H + 1), i;

        // read index table header [0x0001] - 2 bytes
        if (getBit32(pIO, 16) != 1)
            return ICERR_ERROR;

        //iBits = getBit16(pIO, 5) + 1; // how many bits per entry
        for(i = 0; i < iEntry; i ++){
            readIS_L1(pSC, pIO);
            pTable[i] = GetVLWordEsc(pIO, NULL);  // escape handling is not important since the respective band is not accessed
        }
    }

    pSC->cHeaderSize = GetVLWordEsc(pIO, NULL);  // escape handling is not important
    flushToByte(pIO);    
    
    pSC->cHeaderSize += getPosRead(pSC->pIOHeader); // get header length

    return ICERR_OK;
}

Int StrIODecInit(CWMImageStrCodec* pSC)
{
    if(allocateBitIOInfo(pSC) != ICERR_OK){
        return ICERR_ERROR;
    }
    
    attachISRead(pSC->pIOHeader, pSC->WMISCP.pWStream, pSC);

    readIndexTable(pSC);

    if(pSC->WMISCP.bVerbose){
        U32 i, j;

        printf("\n%d horizontal tiles:\n", pSC->WMISCP.cNumOfSliceMinus1H + 1);
        for(i = 0; i <= pSC->WMISCP.cNumOfSliceMinus1H; i ++){
            printf("    offset of tile %d in MBs: %d\n", i, pSC->WMISCP.uiTileY[i]);
        }

        printf("\n%d vertical tiles:\n", pSC->WMISCP.cNumOfSliceMinus1V + 1);
        for(i = 0; i <= pSC->WMISCP.cNumOfSliceMinus1V; i ++){
            printf("    offset of tile %d in MBs: %d\n", i, pSC->WMISCP.uiTileX[i]);
        }

        if(pSC->WMISCP.bfBitstreamFormat == SPATIAL){
            printf("\nSpatial order bitstream\n");
        }
        else{
            printf("\nFrequency order bitstream\n");
        }

        if(!pSC->m_param.bIndexTable){
            printf("\nstreaming mode, no index table.\n");
        }
        else if(pSC->WMISCP.bfBitstreamFormat == SPATIAL){
            for(j = 0; j <= pSC->WMISCP.cNumOfSliceMinus1H; j ++){
                for(i = 0; i <= pSC->WMISCP.cNumOfSliceMinus1V; i ++){
                    size_t * p = &pSC->pIndexTable[j * (pSC->WMISCP.cNumOfSliceMinus1V + 1) + i];
                    if(i + j != pSC->WMISCP.cNumOfSliceMinus1H + pSC->WMISCP.cNumOfSliceMinus1V){
                        printf("bitstream size for tile (%d, %d): %d.\n", j, i, (int) (p[1] - p[0]));
                    }
                    else{
                        printf("bitstream size for tile (%d, %d): unknown.\n", j, i);
                    }
                }
            }
        }
        else{
            for(j = 0; j <= pSC->WMISCP.cNumOfSliceMinus1H; j ++){
                for(i = 0; i <= pSC->WMISCP.cNumOfSliceMinus1V; i ++){
                    size_t * p = &pSC->pIndexTable[(j * (pSC->WMISCP.cNumOfSliceMinus1V + 1) + i) * 4];
                    if(i + j != pSC->WMISCP.cNumOfSliceMinus1H + pSC->WMISCP.cNumOfSliceMinus1V){
                        printf("bitstream size of (DC, LP, AC, FL) for tile (%d, %d): %d %d %d %d.\n", j, i,
                            (int) (p[1] - p[0]), (int) (p[2] - p[1]), (int) (p[3] - p[2]), (int) (p[4] - p[3]));
                    }
                    else{
                        printf("bitstream size of (DC, LP, AC, FL) for tile (%d, %d): %d %d %d unknown.\n", j, i,
                            (int) (p[1] - p[0]), (int) (p[2] - p[1]), (int) (p[3] - p[2]));
                    }
                }
            }
        }
    }

    return 0;
}

Int StrIODecTerm(CWMImageStrCodec* pSC)
{
    detachISRead(pSC, pSC->pIOHeader);

    free(pSC->m_ppBitIO);
    free(pSC->pIndexTable);

    return 0;
}

Int initLookupTables(CWMImageStrCodec* pSC)
{
    static const U8 cbChannels[BDB_MAX] = {1, 1, 2, 2, 2, 4, 4, 4, (U8) -1, (U8) -1, (U8) -1 };

    CWMImageInfo * pII = &pSC->WMII;
    size_t cStrideX, cStrideY;
    size_t w, h, i, iFirst = 0;
    Bool bReverse;

    // lookup tables for rotation and flipping
    if(pSC->m_Dparam->cThumbnailScale > 1) // thumbnail
        w = pII->cThumbnailWidth, h = pII->cThumbnailHeight;
    else
        w = pII->cWidth, h = pII->cHeight;
    w += (pSC->m_Dparam->cROILeftX + pSC->m_Dparam->cThumbnailScale - 1) / pSC->m_Dparam->cThumbnailScale;
    h += (pSC->m_Dparam->cROITopY + pSC->m_Dparam->cThumbnailScale - 1) / pSC->m_Dparam->cThumbnailScale;