create_qt_tbl()

static JRESULT fl::third_party::create_qt_tbl ( JDEC * jd, const uint8_t * data, size_t ndata )

static

Definition at line 167 of file tjpgd.cpp.hpp.

{
    unsigned int i, zi;
    uint8_t d;
    int32_t *pb;
 
 
    while (ndata) { /* Process all tables in the segment */
        if (ndata < 65) return JDR_FMT1;    /* Err: table size is unaligned */
        ndata -= 65;
        d = *data++;                            /* Get table property */
        if (d & 0xF0) return JDR_FMT1;          /* Err: not 8-bit resolution */
        i = d & 3;                              /* Get table ID */
        pb = (int32_t*)alloc_pool(jd, 64 * sizeof (int32_t));/* Allocate a memory block for the table */
        if (!pb) return JDR_MEM1;               /* Err: not enough memory */
        jd->qttbl[i] = pb;                     /* Register the table */
        for (i = 0; i < 64; i++) {              /* Load the table */
            zi = Zig[i];                     /* Zigzag-order to raster-order conversion */
            pb[zi] = (int32_t)((uint32_t)*data++ * Ipsf[zi]);    /* Apply scale factor of Arai algorithm to the de-quantizers */
        }
    }
 
    return JDR_OK;
}

References alloc_pool(), fl::FL_NO_EXCEPT, Ipsf, JDR_FMT1, JDR_MEM1, JDR_OK, and Zig.

Referenced by jd_prepare().

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