rtpg_union_noarg()

static int rtpg_union_noarg ( rtpg_union_arg  arg, rt_raster  raster  )

static

Definition at line 2058 of file rtpg_mapalgebra.c.

References rtpg_union_arg_t::bandarg, rtpg_union_band_arg_t::nband, rtpg_union_arg_t::numband, rtpg_union_band_arg_t::numraster, PG_FUNCTION_INFO_V1(), POSTGIS_RT_DEBUG, POSTGIS_RT_DEBUGF, rtpg_union_band_arg_t::raster, RASTER_union_transfn(), rt_raster_clone(), rt_raster_get_num_bands(), rt_raster_is_empty(), rtpg_union_band_arg_t::uniontype, and UT_LAST.

Referenced by RASTER_union_transfn().

                                                                  {
        int numbands;
        int i;

        if (rt_raster_is_empty(raster))
                return 1;

        numbands = rt_raster_get_num_bands(raster);
        if (numbands <= arg->numband)
                return 1;

        /* more bands to process */
        POSTGIS_RT_DEBUG(4, "input raster has more bands, adding more bandargs");
        if (arg->numband)
                arg->bandarg = repalloc(arg->bandarg, sizeof(struct rtpg_union_band_arg_t) * numbands);
        else
                arg->bandarg = palloc(sizeof(struct rtpg_union_band_arg_t) * numbands);
        if (arg->bandarg == NULL) {
                elog(ERROR, "rtpg_union_noarg: Could not reallocate memory for band information");
                return 0;
        }

        i = arg->numband;
        arg->numband = numbands;
        for (; i < arg->numband; i++) {
                POSTGIS_RT_DEBUGF(4, "Adding bandarg for band at index %d", i);
                arg->bandarg[i].uniontype = UT_LAST;
                arg->bandarg[i].nband = i;
                arg->bandarg[i].numraster = 1;

                arg->bandarg[i].raster = (rt_raster *) palloc(sizeof(rt_raster) * arg->bandarg[i].numraster);
                if (arg->bandarg[i].raster == NULL) {
                        elog(ERROR, "rtpg_union_noarg: Could not allocate memory for working rasters");
                        return 0;
                }
                memset(arg->bandarg[i].raster, 0, sizeof(rt_raster) * arg->bandarg[i].numraster);

                /* add new working rt_raster but only if working raster already exists */
                if (!rt_raster_is_empty(arg->bandarg[0].raster[0])) {
                        arg->bandarg[i].raster[0] = rt_raster_clone(arg->bandarg[0].raster[0], 0); /* shallow clone */
                        if (arg->bandarg[i].raster[0] == NULL) {
                                elog(ERROR, "rtpg_union_noarg: Could not create working raster");
                                return 0;
                        }
                }
        }

        return 1;
}

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