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f439fbdab5
to use only integer math and store only integer coordinates. FossilOrigin-Name: 02b7640f5118e0a635b68f65765191bb3171b7bd
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/*
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** 2010 August 30
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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*/
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#ifndef _SQLITE3RTREE_H_
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#define _SQLITE3RTREE_H_
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#include <sqlite3.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct sqlite3_rtree_geometry sqlite3_rtree_geometry;
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/*
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** Register a geometry callback named zGeom that can be used as part of an
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** R-Tree geometry query as follows:
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**
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** SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
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*/
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int sqlite3_rtree_geometry_callback(
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sqlite3 *db,
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const char *zGeom,
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#ifdef SQLITE_RTREE_INT_ONLY
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int (*xGeom)(sqlite3_rtree_geometry*, int n, sqlite3_int64 *a, int *pRes),
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#else
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int (*xGeom)(sqlite3_rtree_geometry*, int n, double *a, int *pRes),
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#endif
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void *pContext
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);
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/*
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** A pointer to a structure of the following type is passed as the first
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** argument to callbacks registered using rtree_geometry_callback().
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*/
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struct sqlite3_rtree_geometry {
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void *pContext; /* Copy of pContext passed to s_r_g_c() */
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int nParam; /* Size of array aParam[] */
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double *aParam; /* Parameters passed to SQL geom function */
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void *pUser; /* Callback implementation user data */
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void (*xDelUser)(void *); /* Called by SQLite to clean up pUser */
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};
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#ifdef __cplusplus
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} /* end of the 'extern "C"' block */
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#endif
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#endif /* ifndef _SQLITE3RTREE_H_ */
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