PostGIS  2.2.8dev-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 1096 of file g_serialized.c.

References LWTRIANGLE::bbox, LWTRIANGLE::flags, FLAGS_GET_M, FLAGS_GET_Z, FLAGS_NDIMS, lw_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().

1097 {
1098  uint8_t *start_ptr = data_ptr;
1099  LWTRIANGLE *triangle;
1100  uint32_t npoints = 0;
1101 
1102  assert(data_ptr);
1103 
1104  triangle = (LWTRIANGLE*)lwalloc(sizeof(LWTRIANGLE));
1105  triangle->srid = SRID_UNKNOWN; /* Default */
1106  triangle->bbox = NULL;
1107  triangle->type = TRIANGLETYPE;
1108  triangle->flags = g_flags;
1109 
1110  data_ptr += 4; /* Skip past the type. */
1111  npoints = lw_get_uint32_t(data_ptr); /* Zero => empty geometry */
1112  data_ptr += 4; /* Skip past the npoints. */
1113 
1114  if ( npoints > 0 )
1115  triangle->points = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, data_ptr);
1116  else
1117  triangle->points = ptarray_construct(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), 0); /* Empty triangle */
1118 
1119  data_ptr += FLAGS_NDIMS(g_flags) * npoints * sizeof(double);
1120 
1121  if ( g_size )
1122  *g_size = data_ptr - start_ptr;
1123 
1124  return triangle;
1125 }
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:417
#define TRIANGLETYPE
Definition: liblwgeom.h:83
GBOX * bbox
Definition: liblwgeom.h:415
uint8_t type
Definition: liblwgeom.h:413
uint32_t lw_get_uint32_t(const uint8_t *loc)
Definition: lwgeom_api.c:569
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:172
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:295
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:124
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:125
tuple g_size
Definition: genraster.py:41
void * lwalloc(size_t size)
Definition: lwutil.c:199
#define FLAGS_NDIMS(flags)
Definition: liblwgeom.h:136
int32_t srid
Definition: liblwgeom.h:416
uint8_t flags
Definition: liblwgeom.h:414
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