cairodriver/raster.c File Reference

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

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

Include dependency graph for cairodriver/raster.c:

Go to the source code of this file.

Macros
#define	MAX_IMAGE_SIZE   32767

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.

(C) 2007-2014 by Lars Ahlzen 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

Lars Ahlzen <lars ahlzen.com> (original contributor)

Glynn Clements

Definition in file cairodriver/raster.c.

Macro Definition Documentation

MAX_IMAGE_SIZE

#define MAX_IMAGE_SIZE   32767

Definition at line 21 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 71 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.

Parameters

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

Returns

next row

Definition at line 130 of file cairodriver/raster.c.