/****************************************************************************
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** This file is part of the QtWidgets module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
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****************************************************************************/

#include <QtCore/qglobal.h>

#ifdef Q_WS_MAC

#import <Cocoa/Cocoa.h>

#include "qscroller_p.h"

QT_BEGIN_NAMESPACE

QPointF QScrollerPrivate::realDpi(int screen)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSArray *nsscreens = [NSScreen screens];

    if (screen < 0 || screen >= int([nsscreens count]))
        screen = 0;

    NSScreen *nsscreen = [nsscreens objectAtIndex:screen];
    CGDirectDisplayID display = [[[nsscreen deviceDescription] objectForKey:@"NSScreenNumber"] intValue];

    CGSize mmsize = CGDisplayScreenSize(display);
    if (mmsize.width > 0 && mmsize.height > 0) {
        return QPointF(CGDisplayPixelsWide(display) / mmsize.width,
                       CGDisplayPixelsHigh(display) / mmsize.height) * qreal(25.4);
    } else {
        return QPointF();
    }
    [pool release];
}

QT_END_NAMESPACE

#endif