PostGIS  2.5.0beta1dev-r@@SVN_REVISION@@

◆ lwtriangle_from_gserialized_buffer()

static LWTRIANGLE* lwtriangle_from_gserialized_buffer ( uint8_t data_ptr,
uint8_t  g_flags,
size_t *  g_size 
)
static

Definition at line 1368 of file g_serialized.c.

References LWTRIANGLE::bbox, LWTRIANGLE::flags, FLAGS_GET_M, FLAGS_GET_Z, FLAGS_NDIMS, gserialized_get_uint32_t(), lwalloc(), LWTRIANGLE::points, ptarray_construct(), ptarray_construct_reference_data(), LWTRIANGLE::srid, SRID_UNKNOWN, TRIANGLETYPE, and LWTRIANGLE::type.

Referenced by lwgeom_from_gserialized_buffer().

1369 {
1370  uint8_t *start_ptr = data_ptr;
1371  LWTRIANGLE *triangle;
1372  uint32_t npoints = 0;
1373 
1374  assert(data_ptr);
1375 
1376  triangle = (LWTRIANGLE*)lwalloc(sizeof(LWTRIANGLE));
1377  triangle->srid = SRID_UNKNOWN; /* Default */
1378  triangle->bbox = NULL;
1379  triangle->type = TRIANGLETYPE;
1380  triangle->flags = g_flags;
1381 
1382  data_ptr += 4; /* Skip past the type. */
1383  npoints = gserialized_get_uint32_t(data_ptr); /* Zero => empty geometry */
1384  data_ptr += 4; /* Skip past the npoints. */
1385 
1386  if ( npoints > 0 )
1387  triangle->points = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, data_ptr);
1388  else
1389  triangle->points = ptarray_construct(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), 0); /* Empty triangle */
1390 
1391  data_ptr += FLAGS_NDIMS(g_flags) * npoints * sizeof(double);
1392 
1393  if ( g_size )
1394  *g_size = data_ptr - start_ptr;
1395 
1396  return triangle;
1397 }
POINTARRAY * ptarray_construct(char hasz, char hasm, uint32_t npoints)
Construct an empty pointarray, allocating storage and setting the npoints, but not filling in any inf...
Definition: ptarray.c:62
POINTARRAY * points
Definition: liblwgeom.h:435
#define TRIANGLETYPE
Definition: liblwgeom.h:97
GBOX * bbox
Definition: liblwgeom.h:433
uint8_t type
Definition: liblwgeom.h:431
unsigned int uint32_t
Definition: uthash.h:78
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:187
POINTARRAY * ptarray_construct_reference_data(char hasz, char hasm, uint32_t npoints, uint8_t *ptlist)
Construct a new POINTARRAY, referencing to the data from ptlist.
Definition: ptarray.c:293
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:139
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:140
tuple g_size
Definition: genraster.py:41
void * lwalloc(size_t size)
Definition: lwutil.c:229
static uint32_t gserialized_get_uint32_t(const uint8_t *loc)
Definition: g_serialized.c:35
#define FLAGS_NDIMS(flags)
Definition: liblwgeom.h:151
unsigned char uint8_t
Definition: uthash.h:79
int32_t srid
Definition: liblwgeom.h:434
uint8_t flags
Definition: liblwgeom.h:432
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