176 lines
3.9 KiB
C
176 lines
3.9 KiB
C
#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "Ecore_Fb.h"
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#include "ecore_fb_private.h"
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#include <limits.h>
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static void _ecore_fb_size_get(const char *name, int *w, int *h);
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static int _ecore_fb_init_count = 0;
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static int _ecore_fb_console_w = 0;
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static int _ecore_fb_console_h = 0;
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/**
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* @addtogroup Ecore_FB_Group Ecore_FB - Frame buffer convenience functions.
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*
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* @{
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*/
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static sighandler_t oldhand = NULL;
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static void
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nosigint(int val EINA_UNUSED)
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{
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}
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/**
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* @brief Initialize the Ecore_Fb library.
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*
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* @param name Device target name.
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* @return 1 or greater on success, 0 on error.
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*
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* This function sets up all the Ecore_Fb library. It returns 0 on
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* failure, otherwise it returns the number of times it has already
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* been called.
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*
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* When Ecore_Fb is not used anymore, call ecore_fb_shutdown() to shut down
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* the Ecore_Fb library.
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*/
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EAPI int
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ecore_fb_init(const char *name)
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{
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const char *s;
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if (++_ecore_fb_init_count != 1)
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return _ecore_fb_init_count;
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s = getenv("ECORE_FB_NO_VT");
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if ((!s) || (atoi(s) == 0))
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{
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if (!ecore_fb_vt_init())
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return --_ecore_fb_init_count;
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}
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if (!oldhand)
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{
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oldhand = signal(SIGINT, nosigint);
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}
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_ecore_fb_size_get(name, &_ecore_fb_console_w, &_ecore_fb_console_h);
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return _ecore_fb_init_count;
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}
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/**
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* @brief Shut down the Ecore_Fb library.
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*
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* @return 0 when the library is completely shut down, 1 or
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* greater otherwise.
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*
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* This function shuts down the Ecore_Fb library. It returns 0 when it has
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* been called the same number of times than ecore_fb_init().
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*/
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EAPI int
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ecore_fb_shutdown(void)
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{
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const char *s;
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if (--_ecore_fb_init_count != 0)
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return _ecore_fb_init_count;
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if (oldhand)
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{
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signal(SIGINT, oldhand);
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oldhand = NULL;
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}
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s = getenv("ECORE_FB_NO_VT");
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if ((!s) || (atoi(s) == 0))
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{
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ecore_fb_vt_shutdown();
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}
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return _ecore_fb_init_count;
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}
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/**
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* @brief Retrieve the width and height of the current frame buffer in
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* pixels.
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*
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* @param w Pointer to an integer in which to store the width.
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* @param h Pointer to an interge in which to store the height.
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*
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* This function retrieves the size of the current frame buffer in
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* pixels. @p w and @p h can be buffers that will be filled with the
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* corresponding values. If one of them is @c NULL, nothing will be
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* done for that parameter.
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*/
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EAPI void
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ecore_fb_size_get(int *w, int *h)
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{
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if (w) *w = _ecore_fb_console_w;
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if (h) *h = _ecore_fb_console_h;
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}
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static void
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_ecore_fb_size_get(const char *name, int *w, int *h)
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{
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struct fb_var_screeninfo fb_var;
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int fb;
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const char *s;
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if ((s = getenv("EVAS_FB_DEV")) &&
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(((!strncmp(s, "/dev/fb", 7)) &&
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((s[7] >= '0' && s[7] <= '9') || (s[7] == 0))) ||
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((!strncmp(s, "/dev/fb/", 8)) && (s[8] != '.'))))
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{
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fb = open(s, O_RDWR);
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if (fb < 0)
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fprintf(stderr, "[ecore_fb] error opening $EVAS_FB_DEV=%s: %s\n", s, strerror(errno));
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}
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else
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{
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char dev[PATH_MAX];
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int device;
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/* consistent with ecore_evas_default_display in ecore_evas_fb.c */
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if (!name) name = "0";
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/* consistent with ecore_evas_fb.c -> evas_fb_main.c */
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device = strtol(name, NULL, 10);
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snprintf(dev, sizeof(dev), "/dev/fb/%i", device);
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fb = open(dev, O_RDWR);
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if (fb == -1)
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{
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snprintf(dev, sizeof(dev), "/dev/fb%i", device);
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fb = open(dev, O_RDWR);
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if (fb < 0)
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fprintf(stderr, "[ecore_fb] error opening /dev/fb/%i and /dev/fb%i: %s\n", device, device, strerror(errno));
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}
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}
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if (fb < 0)
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goto exit;
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if (ioctl(fb, FBIOGET_VSCREENINFO, &fb_var) == -1)
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{
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perror("[ecore_fb] ioctl FBIOGET_VSCREENINFO");
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goto err_ioctl;
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}
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*w = fb_var.xres;
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*h = fb_var.yres;
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err_ioctl:
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close(fb);
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exit:
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return;
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}
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/**
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* @}
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*/
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