rtpg_union_mean_callback()

static int rtpg_union_mean_callback ( rt_iterator_arg  arg, void *  userarg, double *  value, int *  nodata  )

static

Definition at line 1878 of file rtpg_mapalgebra.c.

References rt_iterator_arg_t::columns, FLT_NEQ, rt_iterator_arg_t::nodata, POSTGIS_RT_DEBUGF, rt_iterator_arg_t::rasters, rt_iterator_arg_t::rows, and rt_iterator_arg_t::values.

Referenced by RASTER_union_finalfn().

  {
        if (arg == NULL)
                return 0;

        if (
                arg->rasters != 2 ||
                arg->rows != 1 ||
                arg->columns != 1
        ) {
                elog(ERROR, "rtpg_union_mean_callback: Invalid arguments passed to callback");
                return 0;
        }

        *value = 0;
        *nodata = 1;

        POSTGIS_RT_DEBUGF(4, "rast0: %f %d", arg->values[0][0][0], arg->nodata[0][0][0]);
        POSTGIS_RT_DEBUGF(4, "rast1: %f %d", arg->values[1][0][0], arg->nodata[1][0][0]);

        if (
                !arg->nodata[0][0][0] &&
                FLT_NEQ(arg->values[0][0][0], 0) &&
                !arg->nodata[1][0][0]
        ) {
                *value = arg->values[1][0][0] / arg->values[0][0][0];
                *nodata = 0;
        }

        POSTGIS_RT_DEBUGF(4, "value, nodata = (%f, %d)", *value, *nodata);

        return 1;
}

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