1 /*
   2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4 *
   5 * This code is free software; you can redistribute it and/or modify it
   6 * under the terms of the GNU General Public License version 2 only, as
   7 * published by the Free Software Foundation.
   8 *
   9 * This code is distributed in the hope that it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 * version 2 for more details (a copy is included in the LICENSE file that
  13 * accompanied this code).
  14 *
  15 * You should have received a copy of the GNU General Public License version
  16 * 2 along with this work; if not, write to the Free Software Foundation,
  17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18 *
  19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20 * or visit www.oracle.com if you need additional information or have any
  21 * questions.
  22 */
  23 
  24 #include <splashscreen_config.h>
  25 #include <d2d1.h>
  26 #pragma comment(lib, "d2d1")
  27 #include <jdk_util.h>
  28 #include <VersionHelpers.h>
  29 #ifndef MDT_EFFECTIVE_DPI
  30 #define MDT_EFFECTIVE_DPI 0
  31 #endif
  32 
  33 float GetScreenDpi()
  34 {
  35     float dpiX = -1.0f;
  36     float dpiY = -1.0f;
  37     if (IsWindows8OrGreater()) {
  38         unsigned x = 0;
  39         unsigned y = 0;
  40         typedef HRESULT(WINAPI GetDpiForMonitorFunc)(HMONITOR, int, UINT*, UINT*);
  41         static HMODULE sHCoreDll = NULL;
  42         static GetDpiForMonitorFunc *lpGetDpiForMonitor = NULL;
  43 
  44         if (sHCoreDll == NULL) {
  45             sHCoreDll = JDK_LoadSystemLibrary("shcore.dll");
  46             if (sHCoreDll != NULL) {
  47                 lpGetDpiForMonitor = (GetDpiForMonitorFunc*)GetProcAddress(
  48                     sHCoreDll, "GetDpiForMonitor");
  49             }
  50         }
  51         if (lpGetDpiForMonitor != NULL) {
  52             HMONITOR hmon = getPrimaryMonitor();
  53             HRESULT hResult = lpGetDpiForMonitor(hmon,
  54                 MDT_EFFECTIVE_DPI, &x, &y);
  55             if (hResult == S_OK) {
  56                 dpiX = static_cast<float>(x);
  57                 dpiY = static_cast<float>(y);
  58             }
  59         }
  60         return dpiX;
  61     }
  62     else if (IsWindows7OrGreater()) {
  63         ID2D1Factory* m_pDirect2dFactory;
  64         HRESULT res = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED,
  65             &m_pDirect2dFactory);
  66         if (res == S_OK) {
  67             m_pDirect2dFactory->GetDesktopDpi(&dpiX, &dpiY);
  68             m_pDirect2dFactory->Release();
  69         }
  70         return dpiX;
  71     }
  72     return 1.0;
  73 }
  74 
  75 HMONITOR WINAPI getPrimaryMonitor()
  76 {
  77     const POINT point = { 0, 0 };
  78     return MonitorFromPoint(point, MONITOR_DEFAULTTOPRIMARY);
  79 }
  80