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/**
* \file alloc_cell.c
*
* \brief GIS Library - Raster allocation routines.
*
* (C) 2001-2008 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.
*
* \author GRASS GIS Development Team
*
* \date 1999-2008
*/
#include <math.h>
#include <grass/gis.h>
/* convert type "RASTER_MAP_TYPE" into index */
#define F2I(map_type) \
(map_type == CELL_TYPE ? 0 : (map_type == FCELL_TYPE ? 1 : 2))
static int type_size[3] = { sizeof(CELL), sizeof(FCELL), sizeof(DCELL) };
/**
* \brief Returns size of a raster CELL in bytes.
*
* If <b>data_type</b> is CELL_TYPE, returns sizeof(CELL)
* If <b>data_type</b> is FCELL_TYPE, returns sizeof(FCELL)
* If <b>data_type</b> is DCELL_TYPE, returns sizeof(DCELL)
*
* \param[in] data_type
* \return int
*/
size_t G_raster_size(RASTER_MAP_TYPE data_type)
{
return (type_size[F2I(data_type)]);
}
/**
* \brief Allocate memory for a CELL type raster map.
*
* This routine allocates a buffer of type CELL just large enough to
* hold one row of raster data based on the number of columns in the
* active region.<br>
\code
CELL *cell;
cell = G_allocate_cell_buf ();
\endcode
* If larger buffers are required, the routine <i>G_malloc</i> can be used.
* The routine is generally used with each open cell file.<br>
* <b>Note:</b> <i>G_allocate_raster_buf()</i> or
* <i>G_alloc_c_raster_buf()</i> is preferred over
* <i>G_allocate_cell_buf()</i>.
*
* \return CELL * Pointer to allocated buffer
* \return Prints error message and calls <i>exit()</i> on error
*/
CELL *G_allocate_cell_buf(void)
{
return (CELL *) G_calloc(G_window_cols() + 1, sizeof(CELL));
}
/**
* \brief Allocate memory for a raster map of type <b>data_type</b>.
*
* Allocate an array of CELL, FCELL, or DCELL (depending on
* <b>data_type</b>) based on the number of columns in the current
* region.
*
* \param[in] data_type
* \return void *
*/
void *G_allocate_raster_buf(RASTER_MAP_TYPE data_type)
{
return (void *)G_calloc(G_window_cols() + 1, G_raster_size(data_type));
}
/**
* \brief Allocates memory for a raster map of type CELL.
*
* Allocate an array of CELL based on the number of columns in the
* current region.
*
* \return CELL *
*/
CELL *G_allocate_c_raster_buf(void)
{
return (CELL *) G_calloc(G_window_cols() + 1, sizeof(CELL));
}
/**
* \brief Allocates memory for a raster map of type FCELL.
*
* Allocate an array of FCELL based on the number of columns in the
* current region.
*
* \return FCELL *
*/
FCELL *G_allocate_f_raster_buf(void)
{
return (FCELL *) G_calloc(G_window_cols() + 1, sizeof(FCELL));
}
/**
* \brief Allocates memory for a raster map of type DCELL.
*
* Allocate an array of DCELL based on the number of columns in the
* current region.
*
* \return DCELL *
*/
DCELL *G_allocate_d_raster_buf(void)
{
return (DCELL *) G_calloc(G_window_cols() + 1, sizeof(DCELL));
}
/**
* \brief Allocates memory for a null buffer.
*
* Allocate an array of char based on the number of columns in the
* current region.
*
* \return char *
*/
char *G_allocate_null_buf(void)
{
return (char *)G_calloc(G_window_cols() + 1, sizeof(char));
}
/**
* \brief Allocates memory for null bits.
*
* Allocates an array of unsigned char based on <b>cols</b>.
*
* \param[in] cols number of columns in region
* \return unsigned char *
*/
unsigned char *G__allocate_null_bits(int cols)
{
return (unsigned char *)G_calloc(G__null_bitstream_size(cols) + 1,
sizeof(unsigned char));
}
/**
* \brief Determines null bitstream size.
*
* \param[in] cols number of columns
* \return -1 if <b>cols</b> is invalid (<= 0)
* \return size of null bistream
*/
int G__null_bitstream_size(int cols)
{
if (cols <= 0)
return -1;
return (cols / 8 + (cols % 8 != 0));
}
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