self-hosted/postgis
self-hosted/postgis
1
0
Fork 0
mirror of https://git.osgeo.org/gitea/postgis/postgis synced 2024-10-25 01:22:47 +00:00
Code Issues Packages Projects Releases Wiki Activity

Added lwexploded_findlength

Browse source 
git-svn-id: http://svn.osgeo.org/postgis/trunk@861 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Sandro Santilli 2004-09-21 10:57:26 +00:00
parent 8c1f0ecf46
commit 05fad4e009
2 changed files with 122 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
lwgeom/lwgeom.h
View file

@ -398,11 +398,11 @@ typedef struct
{
int SRID;
int ndims;
int npoints;
uint32 npoints;
char **points;
int nlines;
uint32 nlines;
char **lines;
int npolys;
uint32 npolys;
char **polys;
} LWGEOM_EXPLODED;
@ -416,7 +416,13 @@ LWGEOM_EXPLODED * lwexploded_sum(LWGEOM_EXPLODED *exp1, LWGEOM_EXPLODED *exp2);
* This function recursively scan the given serialized geometry
* and returns a list of _all_ subgeoms in it (deep-first)
*/
LWGEOM_EXPLODED *lwgeom_explode(char *serialized);
extern LWGEOM_EXPLODED *lwgeom_explode(char *serialized);
/*
* Return the length of the serialized form corresponding
* to this exploded structure.
*/
extern uint32 lwexploded_findlength(LWGEOM_EXPLODED *exp, int wantbbox);
// Serialize an LWGEOM_EXPLODED object.
// SRID and ndims will be taken from exploded structure.

123
lwgeom/lwgeom_api.c
View file

@ -17,13 +17,16 @@
#include "lwgeom.h"
//#define DEBUG 1
//#define DEBUG_EXPLODED 1
// This is an implementation of the functions defined in lwgeom.h
//forward decs
extern BOX3D *lw_geom_getBB_simple(char *serialized_form);
#ifdef DEBUG_EXPLODED
void checkexplodedsize(char *srl, LWGEOM_EXPLODED *exploded, int alloced, char wantbbox);
#endif
// this will change to NaN when I figure out how to
@ -31,7 +34,6 @@ extern BOX3D *lw_geom_getBB_simple(char *serialized_form);
#define NO_Z_VALUE 0.0
//#define DEBUG 1
//*********************************************************************
// BOX routines
@ -3122,12 +3124,6 @@ lwexploded_serialize(LWGEOM_EXPLODED *exploded, int wantbbox)
elog(NOTICE, " computed outtype: %d, ngeoms: %d", outtype, ngeoms);
#endif
if ( ! ngeoms )
{
return lwgeom_constructempty(exploded->SRID, exploded->ndims);
}
// For a single geometry just set SRID and BBOX (if requested)
if ( ngeoms < 2 )
{
@ -3167,10 +3163,16 @@ lwexploded_serialize(LWGEOM_EXPLODED *exploded, int wantbbox)
loc += sizeof(BOX2DFLOAT4);
memcpy(loc, (ser+1), size-1);
pfree(ser);
#ifdef DEBUG_EXPLODED
checkexplodedsize(result, exploded, size+4, wantbbox);
#endif
return result;
}
else
{
#ifdef DEBUG_EXPLODED
checkexplodedsize(ser, exploded, -1, wantbbox);
#endif
return ser;
}
}
@ -3320,7 +3322,106 @@ lwexploded_serialize(LWGEOM_EXPLODED *exploded, int wantbbox)
}
elog(NOTICE, " numgeoms: %d", lwgeom_getnumgeometries(result));
#endif
#ifdef DEBUG_EXPLODED
checkexplodedsize(result, exploded, size*2, wantbbox);
#endif
return result;
}
#ifdef DEBUG_EXPLODED
void
checkexplodedsize(char *srl, LWGEOM_EXPLODED *exp, int alloced, char wantbbox)
{
elog(NOTICE, "exploded len: serialized:%d computed:%d alloced:%d",
lwgeom_seralizedformlength_simple(srl),
lwexploded_findlength(exp, wantbbox),
alloced);
}
#endif
uint32
lwexploded_findlength(LWGEOM_EXPLODED *exploded, int wantbbox)
{
uint32 size=0;
char ntypes=0;
uint32 i;
// find sum of sizes of all geoms.
// substract size of eventually embedded SRID and BBOXes
if ( exploded->npoints )
{
ntypes++;
for (i=0; i<exploded->npoints; i++)
{
size += lwpoint_findlength(exploded->points[i]);
if ( lwgeom_hasBBOX(exploded->points[i][0]) )
size -= sizeof(BOX2DFLOAT4);
if ( lwgeom_hasSRID(exploded->points[i][0]) )
size -= 4;
}
// add multigeom header size
if ( exploded->npoints > 1 )
{
size += 1; // type
size += 4; // numgeometries
}
}
if ( exploded->nlines )
{
ntypes++;
for (i=0; i<exploded->nlines; i++)
{
size += lwline_findlength(exploded->lines[i]);
if ( lwgeom_hasBBOX(exploded->lines[i][0]) )
size -= sizeof(BOX2DFLOAT4);
if ( lwgeom_hasSRID(exploded->lines[i][0]) )
size -= 4;
}
// add multigeom header size
if ( exploded->nlines > 1 )
{
size += 1; // type
size += 4; // numgeometries
}
}
if ( exploded->npolys )
{
ntypes++;
for (i=0; i<exploded->npolys; i++)
{
size += lwpoly_findlength(exploded->polys[i]);
if ( lwgeom_hasBBOX(exploded->polys[i][0]) )
size -= sizeof(BOX2DFLOAT4);
if ( lwgeom_hasSRID(exploded->polys[i][0]) )
size -= 4;
}
// add multigeom header size
if ( exploded->npolys > 1 )
{
size += 1; // type
size += 4; // numgeometries
}
}
/* structure is empty */
if ( ! ntypes ) return 0;
/* multi-typed geom (collection), add collection header */
if ( ntypes > 1 )
{
size += 1; // type
size += 4; // numgeometries
}
/*
* Add BBOX and SRID if required
*/
if ( exploded->SRID != -1 ) size += 4;
if ( wantbbox ) size += sizeof(BOX2DFLOAT4);
return size;
}