/*
    This file is part of darktable,
    copyright (c) 2014 tobias ellinghaus.

    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    darktable 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <AppKit/AppKit.h>
#include "osx.h"

float dt_osx_get_ppd()
{
  NSScreen *nsscreen = [NSScreen mainScreen];
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
  if([nsscreen respondsToSelector: NSSelectorFromString(@"backingScaleFactor")]) {
    return [[nsscreen valueForKey: @"backingScaleFactor"] floatValue];
  } else {
    return [[nsscreen valueForKey: @"userSpaceScaleFactor"] floatValue];
  }
#else
  return [[nsscreen valueForKey: @"userSpaceScaleFactor"] floatValue];
#endif
}