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

#include <math.h>
#include "cairodriver.h"
#include <grass/glocale.h>

Include dependency graph for cairodriver/raster.c:

Macros
#define	MAX_IMAGE_SIZE 32767

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

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

Functions
void	Cairo_begin_raster (int mask, int s[2][2], double d[2][2])
	Start drawing raster. More...

int	Cairo_raster (int n, int row, const unsigned char red, const unsigned char grn, const unsigned char blu, const unsigned char nul)
	Draw raster row. More...

void	Cairo_end_raster (void)
	Finish drawing raster. More...

Detailed Description

GRASS cairo display driver - draw raster.

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

Author: Lars Ahlzen <lars ahlzen.com> (original contibutor); Glynn Clements

Definition in file cairodriver/raster.c.

Macro Definition Documentation

◆ MAX

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

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

◆ MAX_IMAGE_SIZE

#define MAX_IMAGE_SIZE 32767

Definition at line 20 of file cairodriver/raster.c.

◆ MIN

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

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

Function Documentation

◆ Cairo_begin_raster()

void Cairo_begin_raster	(	int	mask,
		int	s[2][2],
		double	d[2][2]
	)

Start drawing raster.

Todo:: are top and left swapped?

Parameters

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

Definition at line 76 of file cairodriver/raster.c.

◆ Cairo_end_raster()

void Cairo_end_raster ( void )

Finish drawing raster.

Definition at line 180 of file cairodriver/raster.c.

References cairo, and G_debug().

◆ Cairo_raster()

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

Draw raster row.