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git-svn-id: http://svn.osgeo.org/postgis/trunk@12198 b70326c6-7e19-0410-871a-916f4a2858ee
108 lines
3 KiB
C
108 lines
3 KiB
C
/**********************************************************************
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.net
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*
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* Copyright (C) 2012 Sandro Santilli <strk@keybit.net>
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU General Public Licence. See the COPYING file.
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*
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**********************************************************************/
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#ifndef LWGEOM_CACHE_H_
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#define LWGEOM_CACHE_H_ 1
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#include "postgres.h"
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#include "fmgr.h"
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#include "liblwgeom_internal.h"
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#include "lwgeodetic_tree.h"
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#include "lwgeom_pg.h"
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#define PROJ_CACHE_ENTRY 0
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#define PREP_CACHE_ENTRY 1
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#define RTREE_CACHE_ENTRY 2
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#define CIRC_CACHE_ENTRY 3
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#define RECT_CACHE_ENTRY 4
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#define NUM_CACHE_ENTRIES 16
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/*
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* A generic GeomCache just needs space for the cache type,
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* the cache keys (GSERIALIZED geometries), the key sizes,
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* and the argument number the cached index/tree is going
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* to refer to.
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*/
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typedef struct {
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int type;
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GSERIALIZED* geom1;
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GSERIALIZED* geom2;
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size_t geom1_size;
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size_t geom2_size;
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int32 argnum;
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} GeomCache;
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/*
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* Other specific geometry cache types are the
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* RTreeGeomCache - lwgeom_rtree.h
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* PrepGeomCache - lwgeom_geos_prepared.h
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*/
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/*
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* Proj4 caching has it's own mechanism, but is
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* integrated into the generic caching system because
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* some geography functions make cached SRID lookup
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* calls and also CircTree accelerated calls, so
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* there needs to be a management object on
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* fcinfo->flinfo->fn_extra to avoid collisions.
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*/
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/* An entry in the PROJ4 SRS cache */
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typedef struct struct_PROJ4SRSCacheItem
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{
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int srid;
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projPJ projection;
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MemoryContext projection_mcxt;
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}
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PROJ4SRSCacheItem;
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/* PROJ 4 lookup transaction cache methods */
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#define PROJ4_CACHE_ITEMS 8
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/*
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* The proj4 cache holds a fixed number of reprojection
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* entries. In normal usage we don't expect it to have
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* many entries, so we always linearly scan the list.
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*/
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typedef struct struct_PROJ4PortalCache
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{
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int type;
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PROJ4SRSCacheItem PROJ4SRSCache[PROJ4_CACHE_ITEMS];
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int PROJ4SRSCacheCount;
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MemoryContext PROJ4SRSCacheContext;
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}
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PROJ4PortalCache;
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/**
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* Generic signature for functions to manage a geometry
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* cache structure.
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*/
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typedef struct
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{
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int entry_number; /* What kind of structure is this? */
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int (*GeomIndexBuilder)(const LWGEOM* lwgeom, GeomCache* cache); /* Build an index/tree and add it to your cache */
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int (*GeomIndexFreer)(GeomCache* cache); /* Free the index/tree in your cache */
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GeomCache* (*GeomCacheAllocator)(void); /* Allocate the kind of cache object you use (GeomCache+some extra space) */
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} GeomCacheMethods;
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/*
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* Cache retrieval functions
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*/
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PROJ4PortalCache* GetPROJ4SRSCache(FunctionCallInfoData *fcinfo);
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GeomCache* GetGeomCache(FunctionCallInfoData *fcinfo, const GeomCacheMethods* cache_methods, const GSERIALIZED* g1, const GSERIALIZED* g2);
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#endif /* LWGEOM_CACHE_H_ */
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