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 #include "systemScale.h" 24 #include <d2d1.h> 25 #pragma comment(lib, "d2d1") 26 #include <jdk_util.h> 27 #ifndef MDT_EFFECTIVE_DPI 28 #define MDT_EFFECTIVE_DPI 0 29 #endif 30 31 float GetScreenDpi(HMONITOR hmon) 32 { 33 unsigned x = 0; 34 unsigned y = 0; 35 float dpiX = -1.0f; 36 float dpiY = -1.0f; 37 38 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 return scale; 52 } 53 54 typedef HRESULT(WINAPI GetDpiForMonitorFunc)(HMONITOR, int, UINT*, UINT*); 55 static HMODULE hLibSHCoreDll = NULL; 56 static GetDpiForMonitorFunc *lpGetDpiForMonitor = NULL; 57 58 if (hLibSHCoreDll == NULL) { 59 hLibSHCoreDll = JDK_LoadSystemLibrary("shcore.dll"); 60 if (hLibSHCoreDll != NULL) { 61 lpGetDpiForMonitor = (GetDpiForMonitorFunc*)GetProcAddress( 62 hLibSHCoreDll, "GetDpiForMonitor"); 63 } 64 } 65 66 if (lpGetDpiForMonitor != NULL) { 67 HRESULT hResult = lpGetDpiForMonitor(hmon, 68 MDT_EFFECTIVE_DPI, &x, &y); 69 if (hResult == S_OK) { 70 dpiX = static_cast<float>(x); 71 dpiY = static_cast<float>(y); 72 } 73 } else { 74 ID2D1Factory* m_pDirect2dFactory; 75 HRESULT res = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, 76 &m_pDirect2dFactory); 77 if (res == S_OK) { 78 m_pDirect2dFactory->GetDesktopDpi(&dpiX, &dpiY); 79 m_pDirect2dFactory->Release(); 80 } 81 } 82 return dpiX; 83 } 84 85 HMONITOR WINAPI getPrimaryMonitor() 86 { 87 const POINT point = { 0, 0 }; 88 return MonitorFromPoint(point, MONITOR_DEFAULTTOPRIMARY); 89 }