Raster Library - Window mapping functions. More...

#include <stdlib.h>
#include <grass/gis.h>
#include <grass/raster.h>
#include "R.h"

Include dependency graph for raster/window_map.c:

Macros
#define	alloc_index(n) (COLUMN_MAPPING ) G_malloc((n)sizeof(COLUMN_MAPPING))

Functions
void	Rast__create_window_mapping (int fd)
	Create window mapping. More...

int	Rast_row_repeat_nomask (int fd, int row)
	Loops rows until mismatch?. More...

Detailed Description

Raster Library - Window mapping functions.

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author: Original author CERL

Definition in file raster/window_map.c.

Macro Definition Documentation

◆ alloc_index

#define alloc_index ( n ) (COLUMN_MAPPING *) G_malloc((n)*sizeof(COLUMN_MAPPING))

Definition at line 21 of file raster/window_map.c.

Referenced by Rast__create_window_mapping().

Function Documentation

◆ Rast__create_window_mapping()

void Rast__create_window_mapping ( int fd )

Create window mapping.

Creates mapping from cell header into window. The boundaries and resolution of the two spaces do not have to be the same or aligned in any way.

Parameters

fd	file descriptor

Definition at line 33 of file raster/window_map.c.

References alloc_index, fileinfo::C1, fileinfo::C2, fileinfo::cellhd, fileinfo::col_map, Cell_head::cols, Cell_head::east, Cell_head::ew_res, R__::fileinfo, G_debug(), G_free(), Cell_head::north, Cell_head::ns_res, fileinfo::open_mode, OPEN_OLD, Cell_head::proj, PROJECTION_LL, R__::rd_window, Cell_head::west, and x.

◆ Rast_row_repeat_nomask()

int Rast_row_repeat_nomask	(	int	fd,
		int	row
	)

Loops rows until mismatch?.

This routine works fine if the mask is not set. It may give incorrect results with a mask, since the mask row may have a different repeat value. The issue can be fixed by doing it for the mask as well and using the smaller value.

Parameters

fd	file descriptor
row	starting row

Returns: number of rows completed

Definition at line 134 of file raster/window_map.c.

References fileinfo::C1, fileinfo::C2, count, R__::fileinfo, R__::rd_window, and Cell_head::rows.