RASTER_fromGDALRaster()

Datum RASTER_fromGDALRaster

(

PG_FUNCTION_ARGS

)

Definition at line 61 of file rtpg_gdal.c.

{
        bytea *bytea_data;
        uint8_t *data;
        int data_len = 0;
        VSILFILE *vsifp = NULL;
        GDALDatasetH hdsSrc;
        int srid = -1; /* -1 for NULL */
 
        rt_pgraster *pgraster = NULL;
        rt_raster raster;
 
        /* NULL if NULL */
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
 
        /* get data */
        bytea_data = (bytea *) PG_GETARG_BYTEA_P(0);
        data = (uint8_t *) VARDATA(bytea_data);
        data_len = VARSIZE(bytea_data) - VARHDRSZ;
 
        /* process srid */
        /* NULL srid means try to determine SRID from bytea */
        if (!PG_ARGISNULL(1))
                srid = clamp_srid(PG_GETARG_INT32(1));
 
        /* create memory "file" */
        vsifp = VSIFileFromMemBuffer("/vsimem/in.dat", data, data_len, FALSE);
        if (vsifp == NULL) {
                PG_FREE_IF_COPY(bytea_data, 0);
                elog(ERROR, "RASTER_fromGDALRaster: Could not load bytea into memory file for use by GDAL");
                PG_RETURN_NULL();
        }
 
        /* register all GDAL drivers */
        rt_util_gdal_register_all(0);
 
        /* open GDAL raster */
        hdsSrc = rt_util_gdal_open("/vsimem/in.dat", GA_ReadOnly, 1);
        if (hdsSrc == NULL) {
                VSIFCloseL(vsifp);
                PG_FREE_IF_COPY(bytea_data, 0);
                elog(ERROR, "RASTER_fromGDALRaster: Could not open bytea with GDAL. Check that the bytea is of a GDAL supported format");
                PG_RETURN_NULL();
        }
 
#if POSTGIS_DEBUG_LEVEL > 3
        {
                GDALDriverH hdrv = GDALGetDatasetDriver(hdsSrc);
 
                POSTGIS_RT_DEBUGF(4, "Input GDAL Raster info: %s, (%d x %d)",
                        GDALGetDriverShortName(hdrv),
                        GDALGetRasterXSize(hdsSrc),
                        GDALGetRasterYSize(hdsSrc)
                );
        }
#endif
 
        /* convert GDAL raster to raster */
        raster = rt_raster_from_gdal_dataset(hdsSrc);
 
        GDALClose(hdsSrc);
        VSIFCloseL(vsifp);
        PG_FREE_IF_COPY(bytea_data, 0);
 
        if (raster == NULL) {
                elog(ERROR, "RASTER_fromGDALRaster: Could not convert GDAL raster to raster");
                PG_RETURN_NULL();
        }
 
        /* apply SRID if set */
        if (srid != -1)
                rt_raster_set_srid(raster, srid);
 
        pgraster = rt_raster_serialize(raster);
        rt_raster_destroy(raster);
        if (!pgraster)
                PG_RETURN_NULL();
 
        SET_VARSIZE(pgraster, pgraster->size);
        PG_RETURN_POINTER(pgraster);
}

References clamp_srid(), ovdump::data, FALSE, POSTGIS_RT_DEBUGF, rtrowdump::raster, rt_raster_destroy(), rt_raster_from_gdal_dataset(), rt_raster_serialize(), rt_raster_set_srid(), rt_util_gdal_open(), rt_util_gdal_register_all(), and rt_raster_serialized_t::size.

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