gnome-control-center/gnome-settings-daemon/gnome-settings-xsettings.c

#include <config.h>
#include <string.h>
#include <stdio.h>
#include <locale.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <gconf/gconf-client.h>

#include "gnome-settings-daemon.h"
#include "gnome-settings-xsettings.h"
#include "xsettings-manager.h"

extern XSettingsManager **managers;

#ifdef HAVE_XFT2
#define FONT_RENDER_DIR "/desktop/gnome/font_rendering"
#define FONT_ANTIALIASING_KEY FONT_RENDER_DIR "/antialiasing"
#define FONT_HINTING_KEY      FONT_RENDER_DIR "/hinting"
#define FONT_RGBA_ORDER_KEY   FONT_RENDER_DIR "/rgba_order"
#define FONT_DPI_KEY          FONT_RENDER_DIR "/dpi"
#endif /* HAVE_XFT2 */

typedef struct _TranslationEntry TranslationEntry;
typedef void (* TranslationFunc) (TranslationEntry *trans,
                                  GConfValue       *value);
struct _TranslationEntry
{
  const char *gconf_key;
  const char *xsetting_name;
  
  GConfValueType gconf_type;
  TranslationFunc translate;
};

#ifdef HAVE_XFT2 
/* X servers sometimes lie about the screen's physical dimensions, so we cannot
 * compute an accurate DPI value.  When this happens, the user gets fonts that
 * are too huge or too tiny.  So, we see what the server returns:  if it reports
 * something outside of the range [DPI_LOW_REASONABLE_VALUE,
 * DPI_HIGH_REASONABLE_VALUE], then we assume that it is lying and we use
 * DPI_FALLBACK instead.
 *
 * See get_dpi_from_gconf_or_server() below, and also
 * https://bugzilla.novell.com/show_bug.cgi?id=217790
 */
#define DPI_FALLBACK 96
#define DPI_LOW_REASONABLE_VALUE 50
#define DPI_HIGH_REASONABLE_VALUE 500

static void gnome_settings_update_xft (GConfClient *client);
static void xft_callback              (GConfEntry  *entry);
#endif /* HAVE_XFT2 */

static void
translate_bool_int (TranslationEntry *trans,
		    GConfValue       *value)
{
  int i;

  g_assert (value->type == trans->gconf_type);
  
  for (i = 0; managers [i]; i++)  
    xsettings_manager_set_int (managers [i], trans->xsetting_name,
                               gconf_value_get_bool (value));
}

static void
translate_int_int (TranslationEntry *trans,
                   GConfValue       *value)
{
  int i;

  g_assert (value->type == trans->gconf_type);

  for (i = 0; managers [i]; i++)  
    xsettings_manager_set_int (managers [i], trans->xsetting_name,
                               gconf_value_get_int (value));
}

static void
translate_string_string (TranslationEntry *trans,
                         GConfValue       *value)
{
  int i;

  g_assert (value->type == trans->gconf_type);

  for (i = 0; managers [i]; i++)  
    xsettings_manager_set_string (managers [i],
                                  trans->xsetting_name,
                                  gconf_value_get_string (value));
}

static void
translate_string_string_toolbar (TranslationEntry *trans,
				 GConfValue       *value)
{
  int i;
  const char *tmp;
  
  g_assert (value->type == trans->gconf_type);

  /* This is kind of a workaround since GNOME expects the key value to be
   * "both_horiz" and gtk+ wants the XSetting to be "both-horiz".
   */
  tmp = gconf_value_get_string (value);
  if (tmp && strcmp (tmp, "both_horiz") == 0)
	  tmp = "both-horiz";

  for (i = 0; managers [i]; i++) 
    xsettings_manager_set_string (managers [i],
                                  trans->xsetting_name,
                                  tmp);
}

static TranslationEntry translations [] = {
  { "/desktop/gnome/peripherals/mouse/double_click",	"Net/DoubleClickTime",
      GCONF_VALUE_INT,		translate_int_int },
  { "/desktop/gnome/peripherals/mouse/drag_threshold",  "Net/DndDragThreshold",
      GCONF_VALUE_INT,          translate_int_int },
  { "/desktop/gnome/gtk-color-palette",			"Gtk/ColorPalette",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/font_name",		"Gtk/FontName",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/gtk_key_theme",		"Gtk/KeyThemeName",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/toolbar_style",			"Gtk/ToolbarStyle",
      GCONF_VALUE_STRING,	translate_string_string_toolbar },
  { "/desktop/gnome/interface/toolbar_icon_size",		"Gtk/ToolbarIconSize",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/can_change_accels",		"Gtk/CanChangeAccels",
      GCONF_VALUE_BOOL,		translate_bool_int },
  { "/desktop/gnome/interface/cursor_blink",		"Net/CursorBlink",
      GCONF_VALUE_BOOL,		translate_bool_int },
  { "/desktop/gnome/interface/cursor_blink_time",	"Net/CursorBlinkTime",
      GCONF_VALUE_INT,		translate_int_int },
  { "/desktop/gnome/interface/gtk_theme",		"Net/ThemeName",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/gtk_color_scheme",	"Gtk/ColorScheme",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/gtk-im-preedit-style",	"Gtk/IMPreeditStyle",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/gtk-im-status-style",	"Gtk/IMStatusStyle",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/icon_theme",		"Net/IconThemeName",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/file_chooser_backend",	"Gtk/FileChooserBackend",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/interface/menus_have_icons",	"Gtk/MenuImages",
      GCONF_VALUE_BOOL,		translate_bool_int },
  { "/desktop/gnome/interface/menubar_accel",  "Gtk/MenuBarAccel",
      GCONF_VALUE_STRING,      translate_string_string },
  { "/desktop/gnome/peripherals/mouse/cursor_theme",	"Gtk/CursorThemeName",
      GCONF_VALUE_STRING,	translate_string_string },
  { "/desktop/gnome/peripherals/mouse/cursor_size",	"Gtk/CursorThemeSize",
      GCONF_VALUE_INT,		translate_int_int },
  { "/desktop/gnome/interface/show_input_method_menu",  "Gtk/ShowInputMethodMenu",
      GCONF_VALUE_BOOL,		translate_bool_int },
  { "/desktop/gnome/interface/show_unicode_menu",  "Gtk/ShowUnicodeMenu",
      GCONF_VALUE_BOOL,		translate_bool_int },
};

static TranslationEntry*
find_translation_entry (const char *gconf_key)
{
  int i;

  i = 0;
  while (i < G_N_ELEMENTS (translations))
    {
      if (strcmp (translations[i].gconf_key, gconf_key) == 0)
        return &translations[i];

      ++i;
    }

  return NULL;
}

static const gchar* 
type_to_string (GConfValueType type)
{
  switch (type)
    {
    case GCONF_VALUE_INT:
      return "int";
    case GCONF_VALUE_STRING:
      return "string";
    case GCONF_VALUE_FLOAT:
      return "float";
    case GCONF_VALUE_BOOL:
      return "bool";
    case GCONF_VALUE_SCHEMA:
      return "schema";
    case GCONF_VALUE_LIST:
      return "list";
    case GCONF_VALUE_PAIR:
      return "pair";
    case GCONF_VALUE_INVALID:
      return "*invalid*";
    default:
      g_assert_not_reached();
      return NULL; /* for warnings */
    }
}

static void
process_value (TranslationEntry *trans,
               GConfValue       *val)
{  
  if (val == NULL)
    {
      int i;

      for (i = 0; managers [i]; i++)  
        xsettings_manager_delete_setting (managers [i], trans->xsetting_name);
    }
  else
    {
      if (val->type == trans->gconf_type)
        {
          (* trans->translate) (trans, val);
        }
      else
        {
          g_warning (_("GConf key %s set to type %s but its expected type was %s\n"),
                     trans->gconf_key,
                     type_to_string (val->type),
                     type_to_string (trans->gconf_type));
        }
    }
}

static void
xsettings_callback (GConfEntry *entry)
{
  TranslationEntry *trans;
  int i;

  trans = find_translation_entry (entry->key);
  if (trans == NULL)
    return;

  process_value (trans, entry->value);
  
  for (i = 0; managers [i]; i++)
    xsettings_manager_set_string (managers [i], "Net/FallbackIconTheme",
				  "gnome");

  for (i = 0; managers [i]; i++)  
    xsettings_manager_notify (managers [i]);
}

void
gnome_settings_xsettings_init (GConfClient *client)
{
  gnome_settings_daemon_register_callback ("/desktop/gnome/peripherals/mouse", xsettings_callback);
  gnome_settings_daemon_register_callback ("/desktop/gtk", xsettings_callback);
  gnome_settings_daemon_register_callback ("/desktop/gnome/interface", xsettings_callback);

#ifdef HAVE_XFT2  
  gnome_settings_daemon_register_callback (FONT_RENDER_DIR, xft_callback);
#endif /* HAVE_XFT2 */  
}

#ifdef HAVE_XFT2
static void
xft_callback (GConfEntry *entry)
{
  GConfClient *client;
  int i;

  client = gnome_settings_daemon_get_conf_client ();

  gnome_settings_update_xft (client);

  for (i = 0; managers [i]; i++)  
    xsettings_manager_notify (managers [i]);
}

static double
dpi_from_pixels_and_mm (int pixels, int mm)
{
	double dpi;

	if (mm >= 1)
		dpi = pixels / (mm / 25.4);
	else
		dpi = 0;

	return dpi;
}

static double
get_dpi_from_x_server (void)
{
  GdkScreen *screen;
  double dpi;

  screen = gdk_screen_get_default ();
  if (screen)
    {
      double width_dpi, height_dpi;

      width_dpi = dpi_from_pixels_and_mm (gdk_screen_get_width (screen), gdk_screen_get_width_mm (screen));
      height_dpi = dpi_from_pixels_and_mm (gdk_screen_get_height (screen), gdk_screen_get_height_mm (screen));

      if (width_dpi < DPI_LOW_REASONABLE_VALUE || width_dpi > DPI_HIGH_REASONABLE_VALUE
	  || height_dpi < DPI_LOW_REASONABLE_VALUE || height_dpi > DPI_HIGH_REASONABLE_VALUE)
	dpi = DPI_FALLBACK;
      else
	dpi = (width_dpi + height_dpi) / 2.0;
    }
  else
    {
      /* Huh!?  No screen? */

      dpi = DPI_FALLBACK;
    }

  return dpi;
}

static double
get_dpi_from_gconf_or_x_server (GConfClient *client)
{
  GConfValue *value;
  double dpi;

  value = gconf_client_get_without_default (client, FONT_DPI_KEY, NULL);

  /* If the user has ever set the DPI preference in GConf, we use that.
   * Otherwise, we see if the X server reports a reasonable DPI value:  some X
   * servers report completely bogus values, and the user gets huge or tiny
   * fonts which are unusable.
   */

  if (value)
    {
      dpi = gconf_value_get_float (value);
      gconf_value_free (value);
    }
  else
    dpi = get_dpi_from_x_server ();

  return dpi;
}

typedef struct
{
  gboolean antialias;
  gboolean hinting;
  int dpi;
  const char *rgba;
  const char *hintstyle;
} GnomeXftSettings;

static const char *rgba_types[] = { "rgb", "bgr", "vbgr", "vrgb" };

/* Read GConf settings and determine the appropriate Xft settings based on them
 * This probably could be done a bit more cleanly with gconf_string_to_enum
 */
static void
gnome_xft_settings_get (GConfClient      *client,
			GnomeXftSettings *settings)
{
  char *antialiasing = gconf_client_get_string (client, FONT_ANTIALIASING_KEY, NULL);
  char *hinting = gconf_client_get_string (client, FONT_HINTING_KEY, NULL);
  char *rgba_order = gconf_client_get_string (client, FONT_RGBA_ORDER_KEY, NULL);
  double dpi = get_dpi_from_gconf_or_x_server (client);

  settings->antialias = TRUE;
  settings->hinting = TRUE;
  settings->hintstyle = "hintfull";
  settings->dpi = dpi * 1024; /* Xft wants 1/1024ths of an inch */
  settings->rgba = "rgb";

  if (rgba_order)
    {
      int i;
      gboolean found = FALSE;

      for (i = 0; i < G_N_ELEMENTS (rgba_types) && !found; i++)
	if (strcmp (rgba_order, rgba_types[i]) == 0)
	  {
	    settings->rgba = rgba_types[i];
	    found = TRUE;
	  }

      if (!found)
	g_warning ("Invalid value for " FONT_RGBA_ORDER_KEY ": '%s'",
		   rgba_order);
    }
  
  if (hinting)
    {
      if (strcmp (hinting, "none") == 0)
	{
	  settings->hinting = 0;
	  settings->hintstyle = "hintnone";
	}
      else if (strcmp (hinting, "slight") == 0)
	{
	  settings->hinting = 1;
	  settings->hintstyle = "hintslight";
	}
      else if (strcmp (hinting, "medium") == 0)
	{
	  settings->hinting = 1;
	  settings->hintstyle = "hintmedium";
	}
      else if (strcmp (hinting, "full") == 0)
	{
	  settings->hinting = 1;
	  settings->hintstyle = "hintfull";
	}
      else
	g_warning ("Invalid value for " FONT_HINTING_KEY ": '%s'",
		   hinting);
    }
  
  if (antialiasing)
    {
      gboolean use_rgba = FALSE;
      
      if (strcmp (antialiasing, "none") == 0)
	settings->antialias = 0;
      else if (strcmp (antialiasing, "grayscale") == 0)
	settings->antialias = 1;
      else if (strcmp (antialiasing, "rgba") == 0)
	{
	  settings->antialias = 1;
	  use_rgba = TRUE;
	}
      else
	g_warning ("Invalid value for " FONT_ANTIALIASING_KEY " : '%s'",
		   antialiasing);

      if (!use_rgba)
	settings->rgba = "none";
    }

  g_free (rgba_order);
  g_free (hinting);
  g_free (antialiasing);
}

static void
gnome_xft_settings_set_xsettings (GnomeXftSettings *settings)
{
  int i;
  for (i = 0; managers [i]; i++)  
    {
      xsettings_manager_set_int (managers [i], "Xft/Antialias", settings->antialias);
      xsettings_manager_set_int (managers [i], "Xft/Hinting", settings->hinting);
      xsettings_manager_set_string (managers [i], "Xft/HintStyle", settings->hintstyle);
      xsettings_manager_set_int (managers [i], "Xft/DPI", settings->dpi);
      xsettings_manager_set_string (managers [i], "Xft/RGBA", settings->rgba);
    }
}

static void
gnome_xft_settings_set_xresources (GnomeXftSettings *settings)
{
  char *add[] = { "xrdb", "-nocpp", "-merge", NULL };
  GString *add_string = g_string_new (NULL);
  char *old_locale = g_strdup (setlocale (LC_NUMERIC, NULL));

  setlocale (LC_NUMERIC, "C");
  g_string_append_printf (add_string,
			  "Xft.dpi: %f\n", settings->dpi / 1024.);
  g_string_append_printf (add_string,
			  "Xft.antialias: %d\n", settings->antialias);
  g_string_append_printf (add_string,
			  "Xft.hinting: %d\n", settings->hinting);
  g_string_append_printf (add_string,
			  "Xft.hintstyle: %s\n", settings->hintstyle);
  g_string_append_printf (add_string,
			  "Xft.rgba: %s\n", settings->rgba);

  gnome_settings_daemon_spawn_with_input (add, add_string->str);

  g_string_free (add_string, TRUE);
  setlocale (LC_NUMERIC, old_locale);
  g_free (old_locale);
}

/* We mirror the Xft properties both through XSETTINGS and through
 * X resources
 */
static void
gnome_settings_update_xft (GConfClient *client)
{
  GnomeXftSettings settings;

  gnome_xft_settings_get (client, &settings);
  gnome_xft_settings_set_xsettings (&settings);
  gnome_xft_settings_set_xresources (&settings);
}
#endif /* HAVE_XFT2 */

void
gnome_settings_xsettings_load (GConfClient *client)
{
  int i;

  i = 0;
  while (i < G_N_ELEMENTS (translations))
    {
      GConfValue *val;
      GError *err;

      err = NULL;
      val = gconf_client_get (client,
                              translations[i].gconf_key,
                              &err);

      if (err != NULL)
        {
	  fprintf (stderr, "Error getting value for %s: %s\n",
                   translations[i].gconf_key, err->message);
          g_error_free (err);
        }
      else
        {
          process_value (&translations[i], val);
	  if (val != NULL)
                  gconf_value_free (val);
        }
      
      ++i;
    }

#ifdef HAVE_XFT2  
  gnome_settings_update_xft (client);
#endif /* HAVE_XFT */

  for (i = 0; managers [i]; i++)
    xsettings_manager_set_string (managers [i], "Net/FallbackIconTheme",
				  "gnome");

  for (i = 0; managers [i]; i++)  
    xsettings_manager_notify (managers [i]);
}