alloc_cell.c

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#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) };


size_t G_raster_size(RASTER_MAP_TYPE data_type)
{
    return (type_size[F2I(data_type)]);
}


CELL *G_allocate_cell_buf(void)
{
    return (CELL *) G_calloc(G_window_cols() + 1, sizeof(CELL));
}


void *G_allocate_raster_buf(RASTER_MAP_TYPE data_type)
{
    return (void *)G_calloc(G_window_cols() + 1, G_raster_size(data_type));
}


CELL *G_allocate_c_raster_buf(void)
{
    return (CELL *) G_calloc(G_window_cols() + 1, sizeof(CELL));
}


FCELL *G_allocate_f_raster_buf(void)
{
    return (FCELL *) G_calloc(G_window_cols() + 1, sizeof(FCELL));
}


DCELL *G_allocate_d_raster_buf(void)
{
    return (DCELL *) G_calloc(G_window_cols() + 1, sizeof(DCELL));
}


char *G_allocate_null_buf(void)
{
    return (char *)G_calloc(G_window_cols() + 1, sizeof(char));
}


unsigned char *G__allocate_null_bits(int cols)
{
    return (unsigned char *)G_calloc(G__null_bitstream_size(cols) + 1,
                                     sizeof(unsigned char));
}


int G__null_bitstream_size(int cols)
{
    if (cols <= 0)
        return -1;

    return (cols / 8 + (cols % 8 != 0));
}