pngdriver/raster.c File Reference

GRASS png display driver - draw raster. More...

#include <string.h>
#include <math.h>
#include <grass/gis.h>
#include "driver.h"
#include "pngdriver.h"

Include dependency graph for pngdriver/raster.c:

Go to the source code of this file.

Macros
#define	min(a, b)   ((a) < (b) ? (a) : (b))
#define	max(a, b)   ((a) > (b) ? (a) : (b))

Functions
void	PNG_begin_raster (int mask, int s[2][2], double fd[2][2])
	Start drawing raster. More...
int	PNG_raster (UNUSED int n, int row, const unsigned char *red, const unsigned char *grn, const unsigned char *blu, const unsigned char *nul)
	Draw raster row. More...

Detailed Description

GRASS png display driver - draw raster.

(C) 2003-2014 by Per Henrik Johansen and 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

Per Henrik Johansen (original contributor)

Glynn Clements

Definition in file pngdriver/raster.c.

Macro Definition Documentation

max

#define max	(		a,
			b
	)		((a) > (b) ? (a) : (b))

Definition at line 25 of file pngdriver/raster.c.

min

#define min	(		a,
			b
	)		((a) < (b) ? (a) : (b))

Definition at line 22 of file pngdriver/raster.c.

Function Documentation

PNG_begin_raster()

void PNG_begin_raster	(	int	mask,
		int	s[2][2],
		double	fd[2][2]
	)

Start drawing raster.

Parameters

mask	non-zero int for mask
s	source (map) extent (left, right, top, bottom)
fd	destination (image) extent (left, right, top, bottom)

Definition at line 80 of file pngdriver/raster.c.

PNG_raster()

int PNG_raster	(	UNUSED int	n,
		int	row,
		const unsigned char *	red,
		const unsigned char *	grn,
		const unsigned char *	blu,
		const unsigned char *	nul
	)

Draw raster row.

Parameters

n	number of cells
row	raster row (starts at 0)
red,grn,blu,nul	red,green,blue and null value

Returns

next row

Definition at line 111 of file pngdriver/raster.c.