#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;
}

/**
 * @}
 */