changeprecision.c

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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <grass/raster3d.h>
 
/*---------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 *  Makes a copy of <em>map</em> with name <em>nameOut</em> which is
 *  written with <em>precision</em>.
 * The source code can be found in <em>changeprecision.c</em>.
 *
 *  \param map
 *  \param precision
 *  \param nameOut
 *  \return void
 */
void Rast3d_change_precision(void *map, int precision, const char *nameOut)
{
    void *map2;
    int x, y, z, savePrecision, saveCompression;
    char *data;
    RASTER3D_Region region;
    int typeIntern;
    int nx, ny, nz;
    int tileXsave, tileYsave, tileZsave, tileX, tileY, tileZ, saveType;
 
    saveType = Rast3d_get_file_type();
    /*   Rast3d_set_file_type (Rast3d_file_type_map (map)); */
    Rast3d_get_compression_mode(&saveCompression, &savePrecision);
    Rast3d_set_compression_mode(RASTER3D_COMPRESSION, precision);
    Rast3d_get_tile_dimension(&tileXsave, &tileYsave, &tileZsave);
    Rast3d_get_tile_dimensions_map(map, &tileX, &tileY, &tileZ);
    Rast3d_set_tile_dimension(tileX, tileY, tileZ);
 
    typeIntern = Rast3d_tile_type_map(map);
    Rast3d_get_region_struct_map(map, &region);
 
    map2 = Rast3d_open_cell_new(nameOut, typeIntern, RASTER3D_USE_CACHE_DEFAULT,
                                &region);
    if (map2 == NULL)
        Rast3d_fatal_error(
            "Rast3d_change_precision: error in Rast3d_open_cell_new");
 
    Rast3d_set_file_type(saveType);
    Rast3d_set_compression_mode(saveCompression, savePrecision);
    Rast3d_set_tile_dimension(tileXsave, tileYsave, tileZsave);
 
    data = Rast3d_alloc_tiles(map, 1);
    if (data == NULL)
        Rast3d_fatal_error(
            "Rast3d_change_precision: error in Rast3d_alloc_tiles");
    Rast3d_get_nof_tiles_map(map2, &nx, &ny, &nz);
 
    for (z = 0; z < nz; z++)
        for (y = 0; y < ny; y++)
            for (x = 0; x < nx; x++) {
                if (!Rast3d_read_tile(map, Rast3d_tile2tile_index(map, x, y, z),
                                      data, typeIntern))
                    Rast3d_fatal_error(
                        "Rast3d_change_precision: error in Rast3d_read_tile");
                if (!Rast3d_write_tile(map2,
                                       Rast3d_tile2tile_index(map2, x, y, z),
                                       data, typeIntern))
                    Rast3d_fatal_error(
                        "Rast3d_change_precision: error in Rast3d_write_tile");
            }
 
    Rast3d_free_tiles(data);
    if (!Rast3d_close(map2))
        Rast3d_fatal_error("Rast3d_change_precision: error in Rast3d_close");
}