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/*
* Copyright (C) 2006, Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <gdk/gdkx.h>
#include <gdk/gdkscreen.h>
#include <gtk/gtksettings.h>
#include "sugar-utils.h"
/* Ported from mozilla nsDeviceContextGTK.cpp */
static gint
get_gtk_settings_dpi(void)
{
GtkSettings *settings = gtk_settings_get_default();
GParamSpec *spec;
gint dpi = 0;
spec = g_object_class_find_property(
G_OBJECT_GET_CLASS(G_OBJECT(settings)), "gtk-xft-dpi");
if (spec) {
g_object_get(G_OBJECT(settings),
"gtk-xft-dpi", &dpi,
NULL);
}
return (int)(dpi / 1024.0 + 0.5);
}
static gint
get_xft_dpi(void)
{
char *val = XGetDefault(GDK_DISPLAY(), "Xft", "dpi");
if (val) {
char *e;
double d = strtod(val, &e);
if (e != val)
return (int)(d + 0.5);
}
return 0;
}
static int
get_dpi_from_physical_resolution(void)
{
float screen_width_in;
screen_width_in = (float)(gdk_screen_width_mm()) / 25.4f;
return (int)((float)(gdk_screen_width()) / screen_width_in + 0.5);
}
gint
sugar_get_screen_dpi(void)
{
int dpi;
dpi = get_gtk_settings_dpi();
if (dpi == 0) {
dpi = get_xft_dpi();
}
if (dpi == 0) {
dpi = get_dpi_from_physical_resolution();
}
return dpi;
}
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