1 /* 2 * Copyright (c) 2016, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 #include "systemScale.h" 26 #include <d2d1.h> 27 #pragma comment(lib, "d2d1") 28 #include <jdk_util.h> 29 #ifndef MDT_EFFECTIVE_DPI 30 #define MDT_EFFECTIVE_DPI 0 31 #endif 32 33 void GetScreenDpi(HMONITOR hmon, float *dpiX, float *dpiY) 34 { 35 unsigned x = 0; 36 unsigned y = 0; 37 38 // for debug purposes 39 static float scale = -2.0f; 40 if (scale == -2) { 41 scale = -1; 42 char *uiScale = getenv("J2D_UISCALE"); 43 if (uiScale != NULL) { 44 scale = (float)strtod(uiScale, NULL); 45 if (errno == ERANGE || scale <= 0) { 46 scale = -1; 47 } 48 } 49 } 50 51 if (scale > 0) { 52 *dpiX = *dpiY = scale; 53 return; 54 } 55 56 typedef HRESULT(WINAPI GetDpiForMonitorFunc)(HMONITOR, int, UINT*, UINT*); 57 static HMODULE hLibSHCoreDll = NULL; 58 static GetDpiForMonitorFunc *lpGetDpiForMonitor = NULL; 59 60 if (hLibSHCoreDll == NULL) { 61 hLibSHCoreDll = JDK_LoadSystemLibrary("shcore.dll"); 62 if (hLibSHCoreDll != NULL) { 63 lpGetDpiForMonitor = (GetDpiForMonitorFunc*)GetProcAddress( 64 hLibSHCoreDll, "GetDpiForMonitor"); 65 } 66 } 67 68 if (lpGetDpiForMonitor != NULL) { 69 HRESULT hResult = lpGetDpiForMonitor(hmon, 70 MDT_EFFECTIVE_DPI, &x, &y); 71 if (hResult == S_OK) { 72 *dpiX = static_cast<float>(x); 73 *dpiY = static_cast<float>(y); 74 } 75 } else { 76 ID2D1Factory* m_pDirect2dFactory; 77 HRESULT res = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, 78 &m_pDirect2dFactory); 79 if (res == S_OK) { 80 m_pDirect2dFactory->GetDesktopDpi(dpiX, dpiY); 81 m_pDirect2dFactory->Release(); 82 } 83 } 84 return; 85 } 86 87 HMONITOR WINAPI getPrimaryMonitor() 88 { 89 const POINT point = { 0, 0 }; 90 return MonitorFromPoint(point, MONITOR_DEFAULTTOPRIMARY); 91 }