GRASS GIS 8 Programmer's Manual 8.4.1(2025)-45ca3179ab
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pngdriver/graph_close.c
Go to the documentation of this file.
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
28static 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 */
51{
53
54 if (png.mapped)
55 unmap_file();
56 else
57 G_free(png.grid);
58}
void G_free(void *buf)
Free allocated memory.
Definition alloc.c:150
#define HEADER_SIZE
Definition cairodriver.h:46
void PNG_Graph_close(void)
Close down the graphics processing. This gets called only at driver termination time.
struct png_state png
GRASS png display driver - header file.
void write_image(void)