| /* |
| * Copyright (c) 2016, 2019, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 "systemScale.h" |
| #include <jdk_util.h> |
| #ifndef MDT_EFFECTIVE_DPI |
| #define MDT_EFFECTIVE_DPI 0 |
| #endif |
| |
| void GetScreenDpi(HMONITOR hmon, float *dpiX, float *dpiY) |
| { |
| unsigned x = 0; |
| unsigned y = 0; |
| |
| // for debug purposes |
| static float scale = -2.0f; |
| if (scale == -2) { |
| scale = -1; |
| char *uiScale = getenv("J2D_UISCALE"); |
| if (uiScale != NULL) { |
| scale = (float)strtod(uiScale, NULL); |
| if (errno == ERANGE || scale <= 0) { |
| scale = -1; |
| } |
| } |
| } |
| |
| if (scale > 0) { |
| *dpiX = *dpiY = scale; |
| return; |
| } |
| |
| typedef HRESULT(WINAPI GetDpiForMonitorFunc)(HMONITOR, int, UINT*, UINT*); |
| static HMODULE hLibSHCoreDll = NULL; |
| static GetDpiForMonitorFunc *lpGetDpiForMonitor = NULL; |
| |
| if (hLibSHCoreDll == NULL) { |
| hLibSHCoreDll = JDK_LoadSystemLibrary("shcore.dll"); |
| if (hLibSHCoreDll != NULL) { |
| lpGetDpiForMonitor = (GetDpiForMonitorFunc*)GetProcAddress( |
| hLibSHCoreDll, "GetDpiForMonitor"); |
| } |
| } |
| |
| if (lpGetDpiForMonitor != NULL) { |
| HRESULT hResult = lpGetDpiForMonitor(hmon, |
| MDT_EFFECTIVE_DPI, &x, &y); |
| if (hResult == S_OK) { |
| *dpiX = static_cast<float>(x); |
| *dpiY = static_cast<float>(y); |
| } |
| } else { |
| HDC hdc = GetDC(NULL); |
| if (hdc) { |
| *dpiX = static_cast<float>(GetDeviceCaps(hdc, LOGPIXELSX)); |
| *dpiY = static_cast<float>(GetDeviceCaps(hdc, LOGPIXELSY)); |
| ReleaseDC(NULL, hdc); |
| } |
| } |
| return; |
| } |
| |
| HMONITOR WINAPI getPrimaryMonitor() |
| { |
| const POINT point = { 0, 0 }; |
| return MonitorFromPoint(point, MONITOR_DEFAULTTOPRIMARY); |
| } |