GRASS GIS 7 Programmer's Manual
7.9.dev(2021)-e5379bbd7
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OGSF library - dataset loading and management (lower level functions) More...
#include <stdlib.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/glocale.h>
#include <grass/ogsf.h>
Go to the source code of this file.
Macros | |
#define | LUCKY 33 |
#define | BLOC 20 |
#define | MAX_DS 100 |
Functions | |
int | gsds_findh (const char *name, IFLAG *changes, IFLAG *types, int begin) |
Get handle to gsds. More... | |
int | gsds_newh (const char *name) |
Get handle to gsds. More... | |
typbuff * | gsds_get_typbuff (int id, IFLAG change_flag) |
Get data buffer. More... | |
char * | gsds_get_name (int id) |
Get name. More... | |
int | gsds_free_datah (int id) |
Free allocated dataset. More... | |
int | gsds_free_data_buff (int id, int typ) |
Free allocated buffer. More... | |
size_t | free_data_buffs (dataset *ds, int typ) |
Free data buffer. More... | |
size_t | gsds_alloc_typbuff (int id, int *dims, int ndims, int type) |
Allocates correct buffer according to type, keeps track of total mem. More... | |
int | gsds_get_changed (int id) |
ADD. More... | |
int | gsds_set_changed (int id, IFLAG reason) |
ADD. More... | |
int | gsds_get_type (int id) |
ADD. More... | |
OGSF library - dataset loading and management (lower level functions)
GRASS OpenGL gsurf OGSF Library
The idea here is to treat datasets as separate objects, which SHOULD:
These structures are defined in gstypes.h:
typedef struct{ float *fb; int *ib; short *sb; char *cb; struct BM *bm; } typbuff;
How about adding a transform func here, so GET_MAPATT would do an on-the-fly transformation? Or even a transform func LIST!
typedef struct{ int data_id; int dims[MAXDIMS]; int ndims; int numbytes; char unique_name[80]; typbuff databuff; int changed; int need_reload; } dataset;
(C) 1999-2008 by the GRASS Development Team
This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.
Definition in file gsds.c.
size_t free_data_buffs | ( | dataset * | ds, |
int | typ | ||
) |
Free data buffer.
ds | pointer to dataset struct |
typ | data type |
Definition at line 393 of file gsds.c.
References ATTY_CHAR, ATTY_FLOAT, ATTY_INT, ATTY_MASK, ATTY_NULL, ATTY_SHORT, typbuff::bm, BM_destroy(), BM_get_map_size(), typbuff::cb, dataset::databuff, dataset::dims, typbuff::fb, free(), typbuff::ib, dataset::ndims, typbuff::nm, NULL, and typbuff::sb.
size_t gsds_alloc_typbuff | ( | int | id, |
int * | dims, | ||
int | ndims, | ||
int | type | ||
) |
Get handle to gsds.
Successive calls will continue search until "begin" is set (problem here is, unique_name no longer uniquely identifies dataset, since changes may be made; but unique_name should still be useful for reloading dataset) changes & types are set to actual for dataset if found.
name | |
changes,types | acceptable changes & types, flags may be or'd not changed is assumed to always be acceptable |
begin | flag to indicate search from beginning |
int gsds_free_data_buff | ( | int | id, |
int | typ | ||
) |
int gsds_free_datah | ( | int | id | ) |
int gsds_get_changed | ( | int | id | ) |
ADD.
id |
Definition at line 615 of file gsds.c.
Referenced by Gs_update_attrange().
char* gsds_get_name | ( | int | id | ) |
Get name.
id |
Definition at line 303 of file gsds.c.
References GPATH_MAX.
Referenced by GS_get_cat_at_xy().
Get data buffer.
Doesn't prevent writing a buff thats's been gotten with change_flag == 0 (could return a copy, but willing to trust calling func for now)
id | dataset id |
change_flag | set changed flag |
Definition at line 281 of file gsds.c.
Referenced by gs_get_att_typbuff(), and Gs_update_attrange().
int gsds_newh | ( | const char * | name | ) |