GRASS 8 Programmer's Manual 8.5.0(2026)-8d6ceba290
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gsd_img_ppm.c
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1/*!
2 \file lib/ogsf/gsd_img_ppm.c
3
4 \brief OGSF library - PPM stuff
5
6 GRASS OpenGL gsurf OGSF Library
7
8 (C) 1999-2008 by the GRASS Development Team
9
10 - added little/big endian test Markus Neteler
11 - modified to PPM by Bob Covill <bcovill@tekmap.ns.ca>
12 - changed 10/99 Jaro
13 - Created new function GS_write_ppm based on RGB dump
14
15 This program is free software under the
16 GNU General Public License (>=v2).
17 Read the file COPYING that comes with GRASS
18 for details.
19
20 \author Bill Brown USACERL, GMSL/University of Illinois
21 \author Markus Neteler
22 \author Bob Covill
23 \author Jaro Hofierka
24 \author Doxygenized by Martin Landa <landa.martin gmail.com> (May 2008)
25 */
26
27#include <stdlib.h>
28
29#include <grass/gis.h>
30#include <grass/glocale.h>
31#include <grass/ogsf.h>
32
33/*!
34 \brief Save current GL screen to ppm file
35
36 \param name file name
37
38 \return 1 on failure
39 \return 0 on success
40 */
41int GS_write_ppm(const char *name)
42{
43 unsigned int x;
44 int y;
45 unsigned int xsize, ysize;
46 FILE *fp;
47 unsigned char *pixbuf;
48
49 if (0 == gsd_getimage(&pixbuf, &xsize, &ysize)) {
50 G_warning(_("Unable to get image of current GL screen"));
51 return (1);
52 }
53
54 if (NULL == (fp = fopen(name, "w"))) {
55 G_warning(_("Unable to open file <%s> for writing"), name);
56 return (1);
57 }
58
59 fprintf(fp, "P6\n%d %d\n255\n", xsize, ysize);
60
61 for (y = ysize - 1; y >= 0; y--) {
62 for (x = 0; x < xsize; x++) {
63 unsigned char r = pixbuf[(y * xsize + x) * 4 + 0];
64 unsigned char g = pixbuf[(y * xsize + x) * 4 + 1];
65 unsigned char b = pixbuf[(y * xsize + x) * 4 + 2];
66
67 fputc((int)r, fp);
68 fputc((int)g, fp);
69 fputc((int)b, fp);
70 }
71 }
72 G_free(pixbuf);
73 fclose(fp);
74
75 return (0);
76}
77
78/*!
79 \brief Write zoom to file
80
81 \param name file name
82 \param xsize,ysize
83
84 \return 1 on failure
85 \return 0 on success
86 */
87int GS_write_zoom(const char *name, unsigned int xsize, unsigned int ysize)
88{
89 unsigned int x;
90 int y;
91 FILE *fp;
92 unsigned char *pixbuf;
93
94 if (0 == gsd_writeView(&pixbuf, xsize, ysize)) {
95 G_warning(_("Unable to write view"));
96 return (1);
97 }
98
99 if (NULL == (fp = fopen(name, "w"))) {
100 G_warning(_("Unable to open file <%s> for writing"), name);
101 return (1);
102 }
103
104 fprintf(fp, "P6\n%d %d\n255\n", xsize, ysize);
105
106 for (y = ysize - 1; y >= 0; y--) {
107 for (x = 0; x < xsize; x++) {
108 unsigned char r = pixbuf[(y * xsize + x) * 4 + 0];
109 unsigned char g = pixbuf[(y * xsize + x) * 4 + 1];
110 unsigned char b = pixbuf[(y * xsize + x) * 4 + 2];
111
112 fputc((int)r, fp);
113 fputc((int)g, fp);
114 fputc((int)b, fp);
115 }
116 }
117 free(pixbuf);
118 fclose(fp);
119
120 return (0);
121}
G_free
void G_free(void *buf)
Free allocated memory.
Definition alloc.c:147
NULL
#define NULL
Definition ccmath.h:32
b
double b
Definition driver/set_window.c:5
r
double r
Definition driver/set_window.c:5
G_warning
void G_warning(const char *msg,...)
Print a warning message to stderr.
Definition gis/error.c:203
GS_write_zoom
int GS_write_zoom(const char *name, unsigned int xsize, unsigned int ysize)
Write zoom to file.
Definition gsd_img_ppm.c:87
GS_write_ppm
int GS_write_ppm(const char *name)
Save current GL screen to ppm file.
Definition gsd_img_ppm.c:41
gsd_writeView
int gsd_writeView(unsigned char **pixbuf, unsigned int xsize, unsigned int ysize)
Write view.
Definition gsd_prim.c:969
gsd_getimage
int gsd_getimage(unsigned char **pixbuf, unsigned int *xsize, unsigned int *ysize)
Get image of current GL screen.
Definition gsd_prim.c:902
g
float g
Definition named_colr.c:7
name
const char * name
Definition named_colr.c:6
x
#define x