gis0geo.h

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/** @file gis0geo.h
 The r-tree define from MyISAM
 *******************************************************/
 
#ifndef _gis0geo_h
#define _gis0geo_h
 
#include "page0types.h"
#include "sql/gis/rtree_support.h"
 
constexpr uint32_t SPLEN = 8;
 
namespace dd {
class Spatial_reference_system;
}
 
/* Rtree split node structure. */
struct rtr_split_node_t {
  double square;  /* square of the mbr.*/
  int n_node;     /* which group in.*/
  uchar *key;     /* key. */
  double *coords; /* mbr. */
};
 
/** Inline function for reserving coords */
inline static double *reserve_coords(double **d_buffer, /*!< in/out: buffer. */
                                     int n_dim)         /*!< in: dimensions. */
{
  double *coords = *d_buffer;
  (*d_buffer) += n_dim * 2;
  return coords;
}
 
/** Split rtree nodes.
 Return which group the first rec is in.  */
int split_rtree_node(
    rtr_split_node_t *node,                   /*!< in: split nodes.*/
    int n_entries,                            /*!< in: entries number.*/
    int all_size,                             /*!< in: total key's size.*/
    int key_size,                             /*!< in: key's size.*/
    int min_size,                             /*!< in: minimal group size.*/
    int size1,                                /*!< in: size of group.*/
    int size2,                                /*!< in: initial group sizes */
    double **d_buffer,                        /*!< in/out: buffer.*/
    int n_dim,                                /*!< in: dimensions. */
    uchar *first_rec,                         /*!< in: the first rec. */
    const dd::Spatial_reference_system *srs); /*!< in: SRS of R-tree */
 
/** Compares two keys a and b depending on mode
 mode can contain these flags:
    PAGE_CUR_INTERSECT   a intersects b
    PAGE_CUR_CONTAIN     a contains   b
    PAGE_CUR_DISJOINT    a disjoint   b
    PAGE_CUR_WITHIN      a within     b
    PAGE_CUR_MBR_EQUAL   All coordinates of MBRs are equal
 @param[in]     mode    compare method
 @param[in]     a       first key
 @param[in]     a_len   first key len
 @param[in]     b       second key
 @param[in]     b_len   second_key_len
 @param[in]     srs     Spatial reference system of R-tree
 @retval true if the predicate is true, otherwise false. */
bool rtree_key_cmp(page_cur_mode_t mode, const uchar *a, int a_len,
                   const uchar *b, int b_len,
                   const dd::Spatial_reference_system *srs);
#endif