mask.c

Go to the documentation of this file.

#include <stdio.h>
#include <grass/gis.h>
#include "raster3d_intern.h"
 
/*--------------------------------------------------------------------------*/
 
/* the standard g3d file format is used to store the mask values. a NULL-value
   is stored for values which are masked out and a "0." is stored for values
   which are not masked out. to improve compression, the precision is set to
   0 and RLE encoding is used.
 */
 
/*--------------------------------------------------------------------------*/
 
static int Rast3d_maskMapExistsVar = 0;
static RASTER3D_Map *Rast3d_maskMap;
 
/*--------------------------------------------------------------------------*/
static void dummy(void)
{
    return;
}
 
static float RASTER3D_MASKNUMmaskValue;
 
/* Call to dummy() to match void return type of Rast3d_set_null_value() */
#define RASTER3D_MASKNUM(map, Xmask, Ymask, Zmask, VALUEmask, TYPEmask)  \
                                                                         \
    (RASTER3D_MASKNUMmaskValue =                                         \
         Rast3d_getMaskFloat(map, Xmask, Ymask, Zmask),                  \
     ((Rast3d_is_null_value_num(&RASTER3D_MASKNUMmaskValue, FCELL_TYPE)) \
          ? Rast3d_set_null_value(VALUEmask, 1, TYPEmask)                \
          : dummy()))
 
/*--------------------------------------------------------------------------*/
 
int Rast3d_mask_close(void)
{
    /* No Idea if this is correct return value */
    if (!Rast3d_maskMapExistsVar)
        return 1;
 
    Rast3d_maskMapExistsVar = 0;
 
    if (!Rast3d_close(Rast3d_maskMap)) {
        Rast3d_error("Rast3d_mask_close: error closing mask");
 
        return 0;
    }
 
    return 1;
}
 
/*--------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 *  Returns 1 if the 3d mask file exists.
 *
 *  \return int
 */
 
int Rast3d_mask_file_exists(void)
{
    return G_find_file_misc(RASTER3D_DIRECTORY, RASTER3D_CELL_ELEMENT,
                            RASTER3D_MASK_MAP, G_mapset()) != NULL;
}
 
/*--------------------------------------------------------------------------*/
 
static int maskOpenOldCacheDefault = RASTER3D_USE_CACHE_DEFAULT;
 
int Rast3d_mask_open_old(void)
{
    RASTER3D_Region region;
 
    /* No Idea if this is correct return value */
    if (Rast3d_maskMapExistsVar)
        return 1;
 
    Rast3d_maskMapExistsVar = Rast3d_mask_file_exists();
 
    if (!Rast3d_maskMapExistsVar)
        return 1;
 
    if ((Rast3d_maskMap = Rast3d_open_cell_old(
             RASTER3D_MASK_MAP, G_mapset(), RASTER3D_DEFAULT_WINDOW, FCELL_TYPE,
             maskOpenOldCacheDefault)) == NULL) {
        Rast3d_error("Rast3d_mask_open_old: cannot open mask");
 
        return 0;
    }
 
    Rast3d_get_region_struct_map(Rast3d_maskMap, &region);
    Rast3d_set_window_map(Rast3d_maskMap, &region);
 
    return 1;
}
 
/*--------------------------------------------------------------------------*/
 
static float Rast3d_getMaskFloat(RASTER3D_Map *map, int x, int y, int z)
{
    double north, east, top;
    float value;
 
    north = ((double)map->window.rows - y - 0.5) / (double)map->window.rows *
                (map->window.north - map->window.south) +
            map->window.south;
    east = ((double)x + 0.5) / (double)map->window.cols *
               (map->window.east - map->window.west) +
           map->window.west;
    top = ((double)z + 0.5) / (double)map->window.depths *
              (map->window.top - map->window.bottom) +
          map->window.bottom;
 
    Rast3d_get_region_value(Rast3d_maskMap, north, east, top, &value,
                            FCELL_TYPE);
    return value;
}
 
/*--------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 *  This function should be used to adjust the cache size used for the
 * 3d-mask. First the open 3d-mask is closed and then opened again with
 * a cache size as specified with <em>cache</em>.
 *
 *  \param cache
 *  \return 1 ... if successful
 *          0 ... otherwise.
 */
 
int Rast3d_mask_reopen(int cache)
{
    int tmp;
 
    if (Rast3d_maskMapExistsVar)
        if (!Rast3d_mask_close()) {
            Rast3d_error("Rast3d_mask_reopen: error closing mask");
 
            return 0;
        }
 
    tmp = maskOpenOldCacheDefault;
    maskOpenOldCacheDefault = cache;
 
    if (!Rast3d_mask_open_old()) {
        Rast3d_error("Rast3d_mask_reopen: error opening mask");
 
        return 0;
    }
 
    maskOpenOldCacheDefault = tmp;
    return 1;
}
 
/*--------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 *  Returns 1 if the cell with cell-coordinates <em>(x, y, z)</em> is masked
 *  out. Returns 0 otherwise.
 *
 *  \param x
 *  \param y
 *  \param z
 *  \return int
 */
 
int Rast3d_is_masked(RASTER3D_Map *map, int x, int y, int z)
{
    if (!Rast3d_maskMapExistsVar)
        return 0;
 
    RASTER3D_MASKNUMmaskValue = Rast3d_getMaskFloat(map, x, y, z);
    return (Rast3d_is_null_value_num(&RASTER3D_MASKNUMmaskValue, FCELL_TYPE));
}
 
/*--------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 * Replaces the value stored in <em>value</em> with the NULL-value if
 * <em>Rast3d_is_masked (x, y, z)</em> returns 1. Does nothing otherwise.
 * <em>value</em> is assumed to be of<em>type</em>.
 *
 *  \param x
 *  \param y
 *  \param z
 *  \param value
 *  \param type
 *  \return void
 */
 
void Rast3d_mask_num(RASTER3D_Map *map, int x, int y, int z, void *value,
                     int type)
{
    if (!Rast3d_maskMapExistsVar)
        return;
    RASTER3D_MASKNUM(map, x, y, z, value, type);
}
 
/*--------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 *  Same as <em>Rast3d_mask_num (x, y, z, value, FCELL_TYPE)</em>.
 *
 *  \param x
 *  \param y
 *  \param z
 *  \param value
 *  \return void
 */
 
void Rast3d_mask_float(RASTER3D_Map *map, int x, int y, int z, float *value)
{
    if (!Rast3d_maskMapExistsVar)
        return;
    RASTER3D_MASKNUM(map, x, y, z, value, FCELL_TYPE);
}
 
/*--------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 * Same as <em>Rast3d_mask_num (x, y, z, value, DCELL_TYPE)</em>.
 *
 *  \param x
 *  \param y
 *  \param z
 *  \param value
 *  \return void
 */
 
void Rast3d_mask_double(RASTER3D_Map *map, int x, int y, int z, double *value)
{
    if (!Rast3d_maskMapExistsVar)
        return;
    RASTER3D_MASKNUM(map, x, y, z, value, DCELL_TYPE);
}
 
/*--------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 *  Replaces the values stored in <em>tile</em> (with <em>tileIndex</em>) for
 *  which <em>Rast3d_is_masked</em> returns 1 with NULL-values. Does not change
 *  the remaining values. The values are assumed to be of <em>type</em>.
 *  Whether replacement is performed or not only depends on location of the
 *  cells of the tile and not on the status of the mask for <em>map</em>
 *  (i.e. turned on or off).
 *
 *  \param map
 *  \param tileIndex
 *  \param tile
 *  \param type
 *  \return void
 */
 
void Rast3d_mask_tile(RASTER3D_Map *map, int tileIndex, void *tile, int type)
{
    int nofNum, rows, cols, depths, xRedundant, yRedundant, zRedundant;
    int x, y, z, xLength, yLength, dx, dy, dz, length;
 
    if (!Rast3d_maskMapExistsVar)
        return;
 
    nofNum = Rast3d_compute_clipped_tile_dimensions(map, tileIndex, &rows,
                                                    &cols, &depths, &xRedundant,
                                                    &yRedundant, &zRedundant);
    Rast3d_tile_index_origin(map, tileIndex, &x, &y, &z);
 
    if (nofNum == map->tileSize) {
        /*AV*/
        /* BEGIN OF ORIGINAL CODE */
        /*
         *    Rast3d_get_tile_dimensions_map (map, &rows, &cols, &depths);
         */
        /*AV*/
        /* BEGIN OF MY CODE */
        Rast3d_get_tile_dimensions_map(map, &cols, &rows, &depths);
        /* END OF MY CODE */
        xRedundant = yRedundant = 0;
    }
 
    rows += y;
    cols += x;
    depths += z;
    length = Rast3d_length(type);
    xLength = xRedundant * length;
    yLength = map->tileX * yRedundant * length;
 
    for (dz = z; dz < depths; dz++) {
        for (dy = y; dy < rows; dy++) {
            for (dx = x; dx < cols; dx++) {
                RASTER3D_MASKNUM(map, dx, dy, dz, tile, type);
                tile = (char *)tile + length;
            }
 
            tile = (char *)tile + xLength;
        }
        tile = (char *)tile + yLength;
    }
}
 
/*--------------------------------------------------------------------------*/
 
/*!
 * \brief
 *
 *  Turns on the mask for <em>map</em>. Do
 * not invoke this function after the first tile has been read since the result
 * might be inconsistent cell-values.
 *
 *  \param map
 *  \return void
 */
 
void Rast3d_mask_on(RASTER3D_Map *map)
{
    map->useMask = 1;
}
 
/*!
 * \brief
 *
 *  Turns off the mask for <em>map</em>.
 * This is the default.  Do not invoke this function after the first tile has
 * been read since the result might be inconsistent cell-values.
 *
 *  \param map
 *  \return void
 */
 
void Rast3d_mask_off(RASTER3D_Map *map)
{
    map->useMask = 0;
}
 
/*!
 * \brief
 *
 *  Returns 1 if the mask for <em>map</em>
 * is turned on. Returns 0 otherwise.
 *
 *  \param map
 *  \return int
 */
 
int Rast3d_mask_is_on(RASTER3D_Map *map)
{
    return map->useMask;
}
 
/*!
 * \brief
 *
 * Returns 1 if the mask for <em>map</em> is turned off. Returns 0 otherwise.
 *
 *  \param map
 *  \return int
 */
 
int Rast3d_mask_is_off(RASTER3D_Map *map)
{
    return !map->useMask;
}
 
/*!
 * \brief
 *
 * Returns the name of the 3d mask file.
 *
 *  \return char *
 */
 
const char *Rast3d_mask_file(void)
{
    return RASTER3D_MASK_MAP;
}
 
/*!
 * \brief
 *
 * Returns 1 if the 3d mask is loaded.
 *
 *  \return int
 */
 
int Rast3d_mask_map_exists(void)
{
    return Rast3d_maskMapExistsVar;
}