Function pixCountPixelsByColumn

deps/leptonica/src/pix3.c:2063–2092

! * \brief pixCountPixelsByColumn() * * \param[in] pix 1 bpp * \return na of counts in each column, or NULL on error */

 * \return  na of counts in each column, or NULL on error
 */
NUMA *
pixCountPixelsByColumn(PIX  *pix)
{
l_int32     i, j, w, h, wpl;
l_uint32   *line, *data;
l_float32  *array;
NUMA       *na;

    PROCNAME("pixCountPixelsByColumn");

    if (!pix || pixGetDepth(pix) != 1)
        return (NUMA *)ERROR_PTR("pix undefined or not 1 bpp", procName, NULL);

    pixGetDimensions(pix, &w, &h, NULL);
    if ((na = numaCreate(w)) == NULL)
        return (NUMA *)ERROR_PTR("na not made", procName, NULL);
    numaSetCount(na, w);
    array = numaGetFArray(na, L_NOCOPY);
    data = pixGetData(pix);
    wpl = pixGetWpl(pix);
    for (i = 0; i < h; i++) {
        line = data + wpl * i;
        for (j = 0; j < w; j++) {
            if (GET_DATA_BIT(line, j))
                array[j] += 1.0;
        }
    }

    return na;
}


/*!