GRASS GIS 8 Programmer's Manual  8.5.0dev(2024)-6fb030f8d8
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.


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


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.

Per Henrik Johansen (original contributor)
Glynn Clements

Definition in file pngdriver/raster.c.

Macro Definition Documentation

◆ max

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

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

◆ min

#define min (   a,
)    ((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.

masknon-zero int for mask
ssource (map) extent (left, right, top, bottom)
fddestination (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.

nnumber of cells
rowraster row (starts at 0)
red,grn,blu,nulred,green,blue and null value
next row

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