/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

#include <splashscreen_config.h>
#include <d2d1.h>
#pragma comment(lib, "d2d1")
#include <jdk_util.h>
#include <VersionHelpers.h>
#ifndef MDT_EFFECTIVE_DPI
#define MDT_EFFECTIVE_DPI 0
#endif

float GetScreenDpi()
{
    float dpiX = -1.0f;
    float dpiY = -1.0f;
    if (IsWindows8OrGreater()) {
        unsigned x = 0;
        unsigned y = 0;
        typedef HRESULT(WINAPI GetDpiForMonitorFunc)(HMONITOR, int, UINT*, UINT*);
        static HMODULE sHCoreDll = NULL;
        static GetDpiForMonitorFunc *lpGetDpiForMonitor = NULL;

        if (sHCoreDll == NULL) {
            sHCoreDll = JDK_LoadSystemLibrary("shcore.dll");
            if (sHCoreDll != NULL) {
                lpGetDpiForMonitor = (GetDpiForMonitorFunc*)GetProcAddress(
                    sHCoreDll, "GetDpiForMonitor");
            }
        }
        if (lpGetDpiForMonitor != NULL) {
            HMONITOR hmon = getPrimaryMonitor();
            HRESULT hResult = lpGetDpiForMonitor(hmon,
                MDT_EFFECTIVE_DPI, &x, &y);
            if (hResult == S_OK) {
                dpiX = static_cast<float>(x);
                dpiY = static_cast<float>(y);
            }
        }
        return dpiX;
    }
    else if (IsWindows7OrGreater()) {
        ID2D1Factory* m_pDirect2dFactory;
        HRESULT res = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED,
            &m_pDirect2dFactory);
        if (res == S_OK) {
            m_pDirect2dFactory->GetDesktopDpi(&dpiX, &dpiY);
            m_pDirect2dFactory->Release();
        }
        return dpiX;
    }
    return 1.0;
}

HMONITOR WINAPI getPrimaryMonitor()
{
    const POINT point = { 0, 0 };
    return MonitorFromPoint(point, MONITOR_DEFAULTTOPRIMARY);
}