RASTER_setPixelValue()

Datum RASTER_setPixelValue

(

PG_FUNCTION_ARGS

)

Definition at line 568 of file rtpg_pixel.c.

{
        rt_pgraster *pgraster = NULL;
        rt_pgraster *pgrtn = NULL;
        rt_raster raster = NULL;
        rt_band band = NULL;
        double pixvalue = 0;
        int32_t bandindex = 0;
        int32_t x = 0;
        int32_t y = 0;
        bool skipset = FALSE;
 
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
 
        /* Check index is not NULL or < 1 */
        if (PG_ARGISNULL(1))
                bandindex = -1;
        else
                bandindex = PG_GETARG_INT32(1);
 
        if (bandindex < 1) {
                elog(NOTICE, "Invalid band index (must use 1-based). Value not set. Returning original raster");
                skipset = TRUE;
        }
 
        /* Validate pixel coordinates are not null */
        if (PG_ARGISNULL(2)) {
                elog(NOTICE, "X coordinate can not be NULL when setting pixel value. Value not set. Returning original raster");
                skipset = TRUE;
        }
        else
                x = PG_GETARG_INT32(2);
 
        if (PG_ARGISNULL(3)) {
                elog(NOTICE, "Y coordinate can not be NULL when setting pixel value. Value not set. Returning original raster");
                skipset = TRUE;
        }
        else
                y = PG_GETARG_INT32(3);
 
        POSTGIS_RT_DEBUGF(3, "Pixel coordinates (%d, %d)", x, y);
 
        /* Deserialize raster */
        pgraster = (rt_pgraster *) PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0));
 
        raster = rt_raster_deserialize(pgraster, FALSE);
        if (!raster) {
                PG_FREE_IF_COPY(pgraster, 0);
                elog(ERROR, "RASTER_setPixelValue: Could not deserialize raster");
                PG_RETURN_NULL();
        }
 
        if (!skipset) {
                /* Fetch requested band */
                band = rt_raster_get_band(raster, bandindex - 1);
                if (!band) {
                        elog(NOTICE, "Could not find raster band of index %d when setting "
                                "pixel value. Value not set. Returning original raster",
                                bandindex);
                        PG_RETURN_POINTER(pgraster);
                }
                else {
                        /* Set the pixel value */
                        if (PG_ARGISNULL(4)) {
                                if (!rt_band_get_hasnodata_flag(band)) {
                                        elog(NOTICE, "Raster do not have a nodata value defined. "
                                                "Set band nodata value first. Nodata value not set. "
                                                "Returning original raster");
                                        PG_RETURN_POINTER(pgraster);
                                }
                                else {
                                        rt_band_get_nodata(band, &pixvalue);
                                        rt_band_set_pixel(band, x - 1, y - 1, pixvalue, NULL);
                                }
                        }
                        else {
                                pixvalue = PG_GETARG_FLOAT8(4);
                                rt_band_set_pixel(band, x - 1, y - 1, pixvalue, NULL);
                        }
                }
        }
 
        pgrtn = rt_raster_serialize(raster);
        rt_raster_destroy(raster);
        PG_FREE_IF_COPY(pgraster, 0);
        if (!pgrtn)
                PG_RETURN_NULL();
 
        SET_VARSIZE(pgrtn, pgrtn->size);
        PG_RETURN_POINTER(pgrtn);
}

References ovdump::band, FALSE, POSTGIS_RT_DEBUGF, rtrowdump::raster, rt_band_get_hasnodata_flag(), rt_band_get_nodata(), rt_band_set_pixel(), rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_band(), rt_raster_serialize(), rt_raster_serialized_t::size, TRUE, pixval::x, and pixval::y.

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