gstwlutils.c

/* GStreamer Wayland video sink
 *
 * Copyright 2018 NXP
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>

#include "gstwlutils.h"

#define WESTON_INI "/etc/xdg/weston/weston.ini"

gboolean
gst_wl_init_surface_state (GstWlDisplay * display, GstWlWindow * self)
{
  gchar path[] = WESTON_INI;
  gchar line[512], *p, *section = NULL, *size = NULL;
  gint fd, n, i;
  gint desktop_width, desktop_height;
  gint display_width, display_height;
  gboolean found_config = FALSE;
  gboolean ret = TRUE;
  struct stat filestat;
  FILE *fp;

  if ((fd = open (path, O_RDONLY)) == -1) {
    return FALSE;
  }

  if (fstat (fd, &filestat) < 0 || !S_ISREG (filestat.st_mode)) {
    close (fd);
    return FALSE;
  }

  fp = fdopen (fd, "r");
  if (fp == NULL) {
    close (fd);
    return FALSE;
  }

  while (fgets (line, sizeof line, fp)) {
    if (found_config)
      break;

    switch (line[0]) {
      case '#':
      case '\n':
        continue;
      case '[':
        p = strchr (&line[1], ']');
        if (!p || p[1] != '\n') {
          continue;
        }
        p[0] = '\0';
        if (section)
          g_free (section);
        section = g_strdup (&line[1]);
        continue;
      default:
        if (section && strcmp (section, "shell") == 0) {
          p = strchr (line, '=');
          if (!p || p == line) {
            continue;
          }

          p[0] = '\0';
          if (strcmp (&line[0], "size") == 0) {
            p++;
            while (isspace (*p))
              p++;
            i = strlen (p);
            while (i > 0 && isspace (p[i - 1])) {
              p[i - 1] = '\0';
              i--;
            }
            if (strlen (p) > 0) {
              if (size)
                g_free (size);
              size = g_strdup (p);
              found_config = TRUE;
            }
          }
        }
        continue;
    }
  }

  if (found_config && size) {
    n = sscanf (size, "%dx%d\n", &desktop_width, &desktop_height);
    if (n != 2) {
      ret = FALSE;
      goto out;
    }
  } else {
    ret = FALSE;
    goto out;
  }

  /* FIXME: only support buffer scale 2 and 1 */
  display_width = gst_wl_display_get_width (display);
  display_height = gst_wl_display_get_height (display);
  if (display_width > 0 && display_height > 0) {
    gst_wl_window_set_scale (self, display_width / desktop_width);
    if (gst_wl_window_get_scale (self) != 1 && gst_wl_window_get_scale (self) != 2) {
      ret = FALSE;
      goto out;
    }
    gst_wl_window_set_fullscreen_width (self, desktop_width);
    gst_wl_window_set_fullscreen_height (self, desktop_height - PANEL_HEIGH);
  } else {
    ret = FALSE;
    goto out;
  }

out:
  if (section)
    g_free (section);
  if (size)
    g_free (size);
  fclose (fp);
  return ret;
}