summaryrefslogtreecommitdiff
path: root/src/lib/ecore_fb/ecore_fb.c
blob: 85ad087d334b199dd9ca9ccccb18e690629e5824 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "Ecore_Fb.h"
#include "ecore_fb_private.h"

static void _ecore_fb_size_get(int *w, int *h);

static int _ecore_fb_init_count = 0;
static int _ecore_fb_console_w = 0;
static int _ecore_fb_console_h = 0;

/**
 * @addtogroup Ecore_FB_Group Ecore_FB - Frame buffer convenience functions.
 *
 * @{
 */

static sighandler_t oldhand = NULL;

static void
nosigint(int val EINA_UNUSED)
{
}

/**
 * @brief Initialize the Ecore_Fb library.
 *
 * @param name Device target name.
 * @return 1 or greater on success, 0 on error.
 *
 * This function sets up all the Ecore_Fb library. It returns 0 on
 * failure, otherwise it returns the number of times it has already
 * been called.
 *
 * When Ecore_Fb is not used anymore, call ecore_fb_shutdown() to shut down
 * the Ecore_Fb library.
 */
EAPI int
ecore_fb_init(const char *name EINA_UNUSED)
{
   if (++_ecore_fb_init_count != 1)
      return _ecore_fb_init_count;

   if (!ecore_fb_vt_init())
      return --_ecore_fb_init_count;

   if (!oldhand)
     {
        oldhand = signal(SIGINT, nosigint);
     }
   
   _ecore_fb_size_get(&_ecore_fb_console_w, &_ecore_fb_console_h);

   return _ecore_fb_init_count;
}

/**
 * @brief Shut down the Ecore_Fb library.
 *
 * @return 0 when the library is completely shut down, 1 or
 * greater otherwise.
 *
 * This function shuts down the Ecore_Fb library. It returns 0 when it has
 * been called the same number of times than ecore_fb_init().
 */
EAPI int
ecore_fb_shutdown(void)
{
   if (--_ecore_fb_init_count != 0)
      return _ecore_fb_init_count;

   if (oldhand)
     {
        signal(SIGINT, oldhand);
        oldhand = NULL;
     }
   
   ecore_fb_vt_shutdown();

   return _ecore_fb_init_count;
}


/**
 * @brief Retrieve the width and height of the current frame buffer in
 * pixels.
 *
 * @param w Pointer to an integer in which to store the width.
 * @param h Pointer to an interge in which to store the height.
 *
 * This function retrieves the size of the current frame buffer in
 * pixels. @p w and @p h can be buffers that will be filled with the
 * corresponding values. If one of them is @c NULL, nothing will be
 * done for that parameter.
 */
EAPI void
ecore_fb_size_get(int *w, int *h)
{
   if (w) *w = _ecore_fb_console_w;
   if (h) *h = _ecore_fb_console_h;
}

static void
_ecore_fb_size_get(int *w, int *h)
{
   struct fb_var_screeninfo fb_var;
   int fb;

   if (
#if defined(HAVE_GETUID) && defined(HAVE_GETEUID)
       (getuid() == geteuid()) &&
#endif
       (getenv("EVAS_FB_DEV")))
     fb = open(getenv("EVAS_FB_DEV"), O_RDWR);
   else
     {
        fb = open("/dev/fb/0", O_RDWR);
        if (fb == -1)
          fb = open("/dev/fb0", O_RDWR);
     }
   if (fb < 0)
      goto exit;

   if (ioctl(fb, FBIOGET_VSCREENINFO, &fb_var) == -1)
      goto err_ioctl;

   *w = fb_var.xres;
   *h = fb_var.yres;

err_ioctl:
   close(fb);
exit:
   return;
}

/**
 * @}
 */