GRASS GIS 7 Programmer's Manual  7.5.svn(2017)-r71915
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pngdriver/read.c
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1 /*!
2  \file lib/pngdriver/read.c
3 
4  \brief GRASS png display driver - read image (lower level functions)
5 
6  (C) 2007-2014 by Glynn Clements and the GRASS Development Team
7 
8  This program is free software under the GNU General Public License
9  (>=v2). Read the file COPYING that comes with GRASS for details.
10 
11  \author Glynn Clements
12 */
13 
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17 
18 #include <grass/config.h>
19 #include <grass/gis.h>
20 #include "pngdriver.h"
21 
22 void read_image(void)
23 {
24  char *p = png.file_name + strlen(png.file_name) - 4;
25 
26  if (G_strcasecmp(p, ".ppm") == 0) {
27  read_ppm();
28  if (png.has_alpha)
29  read_pgm();
30  }
31  else if (G_strcasecmp(p, ".bmp") == 0)
32  read_bmp();
33 #ifdef HAVE_PNG_H
34  else if (G_strcasecmp(p, ".png") == 0)
35  read_png();
36 #endif
37  else
38  G_fatal_error("read_image: unknown file type: %s", p);
39 
40  png.modified = 0;
41 }
int G_strcasecmp(const char *x, const char *y)
String compare ignoring case (upper or lower)
Definition: strings.c:46
GRASS png display driver - header file.
void read_bmp(void)
struct png_state png
void G_fatal_error(const char *msg,...)
Print a fatal error message to stderr.
Definition: gis/error.c:159
void read_image(void)
int modified
Definition: pngdriver.h:47
char * file_name
Definition: pngdriver.h:33
int has_alpha
Definition: pngdriver.h:36
void read_png(void)
Definition: read_png.c:45
void read_ppm(void)
void read_pgm(void)