GRASS GIS 8 Programmer's Manual  8.2.2dev(2023)-3d37ee165c
pngdriver/graph_close.c
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1 /*!
2  \file lib/pngdriver/graph_close.c
3 
4  \brief GRASS png display driver - close graphics processing
5 
6  (C) 2003-2014 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 Per Henrik Johansen (original contributor)
12  \author Glynn Clements
13 */
14 
15 #include <unistd.h>
16 #include <fcntl.h>
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #ifdef __MINGW32__
20 #include <windows.h>
21 #else
22 #include <sys/mman.h>
23 #endif
24 
25 #include <grass/gis.h>
26 #include "pngdriver.h"
27 
28 static void unmap_file(void)
29 {
30  size_t size = HEADER_SIZE + png.width * png.height * sizeof(unsigned int);
31  void *ptr = (char *)png.grid - HEADER_SIZE;
32 
33  if (!png.mapped)
34  return;
35 
36 #ifdef __MINGW32__
37  UnmapViewOfFile(ptr);
38  CloseHandle(png.handle);
39 #else
40  munmap(ptr, size);
41 #endif
42 
43  png.mapped = 0;
44 }
45 
46 /*!
47  \brief Close down the graphics processing. This gets called only at driver
48  termination time.
49 */
50 void PNG_Graph_close(void)
51 {
52  write_image();
53 
54  if (png.mapped)
55  unmap_file();
56  else
57  G_free(png.grid);
58 }
if(!(yy_init))
Definition: sqlp.yy.c:775
#define HEADER_SIZE
Definition: cairodriver.h:45
int width
Definition: pngdriver.h:43
GRASS png display driver - header file.
void G_free(void *)
Free allocated memory.
Definition: gis/alloc.c:149
int height
Definition: pngdriver.h:43
struct png_state png
int mapped
Definition: pngdriver.h:37
void write_image(void)
unsigned int * grid
Definition: pngdriver.h:44
void PNG_Graph_close(void)
Close down the graphics processing. This gets called only at driver termination time.