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 #include <jdk_util.h> 28 #ifndef MDT_EFFECTIVE_DPI 29 #define MDT_EFFECTIVE_DPI 0 30 #endif 31 32 void GetScreenDpi(HMONITOR hmon, float *dpiX, float *dpiY) 33 { 34 unsigned x = 0; 35 unsigned y = 0; 36 37 // for debug purposes 38 static float scale = -2.0f; 39 if (scale == -2) { 40 scale = -1; 41 char *uiScale = getenv("J2D_UISCALE"); 42 if (uiScale != NULL) { 43 scale = (float)strtod(uiScale, NULL); 44 if (errno == ERANGE || scale <= 0) { 45 scale = -1; 46 } 47 } 48 } 49 50 if (scale > 0) { 51 *dpiX = *dpiY = scale; 52 return; 53 } 54 55 typedef HRESULT(WINAPI D2D1CreateFactoryFunc) 56 (D2D1_FACTORY_TYPE, REFIID, 57 CONST D2D1_FACTORY_OPTIONS*, ID2D1Factory**); 58 typedef HRESULT(WINAPI GetDpiForMonitorFunc)(HMONITOR, int, UINT*, UINT*); 59 static HMODULE hLibSHCoreDll = NULL; 60 static GetDpiForMonitorFunc *lpGetDpiForMonitor = NULL; 61 62 if (hLibSHCoreDll == NULL) { 63 hLibSHCoreDll = JDK_LoadSystemLibrary("shcore.dll"); 64 if (hLibSHCoreDll != NULL) { 65 lpGetDpiForMonitor = (GetDpiForMonitorFunc*)GetProcAddress( 66 hLibSHCoreDll, "GetDpiForMonitor"); 67 } 68 } 69 70 if (lpGetDpiForMonitor != NULL) { 71 HRESULT hResult = lpGetDpiForMonitor(hmon, 72 MDT_EFFECTIVE_DPI, &x, &y); 73 if (hResult == S_OK) { 74 *dpiX = static_cast<float>(x); 75 *dpiY = static_cast<float>(y); 76 } 77 } else { 78 static HMODULE d2dDll = NULL; 79 static BOOL loadAttempted = FALSE; 80 static D2D1CreateFactoryFunc *lpD2D1CreateFactory = NULL; 81 if (!loadAttempted && d2dDll == NULL) { 82 loadAttempted = TRUE; 83 d2dDll = JDK_LoadSystemLibrary("d2d1.dll"); 84 } 85 if (d2dDll != NULL && lpD2D1CreateFactory == NULL) { 86 lpD2D1CreateFactory = (D2D1CreateFactoryFunc*)GetProcAddress( 87 d2dDll, "D2D1CreateFactory"); 88 } 89 if (lpD2D1CreateFactory != NULL) { 90 ID2D1Factory* m_pDirect2dFactory; 91 HRESULT res = lpD2D1CreateFactory 92 (D2D1_FACTORY_TYPE_SINGLE_THREADED, 93 __uuidof(ID2D1Factory), NULL, 94 &m_pDirect2dFactory); 95 if (res == S_OK) { 96 m_pDirect2dFactory->GetDesktopDpi(dpiX, dpiY); 97 m_pDirect2dFactory->Release(); 98 } 99 } 100 } 101 return; 102 } 103 104 HMONITOR WINAPI getPrimaryMonitor() 105 { 106 const POINT point = { 0, 0 }; 107 return MonitorFromPoint(point, MONITOR_DEFAULTTOPRIMARY); 108 }