get_row_colr.c File Reference

Raster Library - Get raster row (colors) More...

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

Include dependency graph for get_row_colr.c:

Go to the source code of this file.

Functions
void	Rast_get_row_colors (int fd, int row, struct Colors *colors, unsigned char *red, unsigned char *grn, unsigned char *blu, unsigned char *nul)
	Reads a row of raster data and converts it to RGB. More...

Detailed Description

Raster Library - Get raster row (colors)

(C) 1999-2009 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

USACERL and many others

Definition in file get_row_colr.c.

Function Documentation

Rast_get_row_colors()

void Rast_get_row_colors	(	int	fd,
		int	row,
		struct Colors *	colors,
		unsigned char *	red,
		unsigned char *	grn,
		unsigned char *	blu,
		unsigned char *	nul
	)

Reads a row of raster data and converts it to RGB.

Reads a row of raster data and converts it to red, green and blue components according to the colors parameter. This provides a convenient way to treat a raster layer as a color image without having to explicitly cater for each of CELL, FCELL and DCELL types.

Parameters

	fd	field descriptor
	row	row number
	colors	pointer to Colors structure which holds color info
[out]	red	red value
[out]	grn	green value
[out]	blu	blue value
[out]	nul	null value

Returns

void

Definition at line 39 of file get_row_colr.c.