108 lines
4.3 KiB
Java
108 lines
4.3 KiB
Java
/*
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* Copyright 2023 dorkbox, llc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.jna.windows;
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import com.sun.jna.Function;
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import com.sun.jna.NativeLibrary;
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import com.sun.jna.platform.win32.WinNT;
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import com.sun.jna.platform.win32.WinUser;
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import com.sun.jna.ptr.IntByReference;
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import dorkbox.jna.JNA;
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import dorkbox.os.OS;
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/**
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* bindings for ShCore.dll
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*
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* Minimum supported client
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* Windows 8.1 [desktop apps only]
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*
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* Minimum supported server
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* Windows Server 2012 R2 [desktop apps only]
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*
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* <p>
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* Direct-mapping, See: https://github.com/java-native-access/jna/blob/master/www/DirectMapping.md
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*/
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public
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class ShCore {
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public static final int DPI_AWARENESS_INVALID = -1;
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public static final int DPI_AWARENESS_UNAWARE = 0;
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public static final int DPI_AWARENESS_SYSTEM_AWARE = 1;
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public static final int DPI_AWARENESS_PER_MONITOR_AWARE = 2;
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private static Function GetDpiForMonitor = null;
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private static Function SetProcessDpiAwareness = null;
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static {
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if (OS.Windows.INSTANCE.isWindows8_1_plus()) {
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NativeLibrary library = JNA.register("shcore", ShCore.class);
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// Abusing static fields this way is not proper, but it gets the job done nicely.
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// GetDpiForMonitor is NOT always available! (Windows 8.1+)
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GetDpiForMonitor = library.getFunction("GetDpiForMonitor");
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SetProcessDpiAwareness = library.getFunction("SetProcessDpiAwareness");
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}
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}
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/**
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* https://msdn.microsoft.com/de-de/library/windows/desktop/dn280510(v=vs.85).aspx
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*
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* @param hMonitor A handle to the window whose DC is to be retrieved. If this value is NULL, GetDC retrieves the DC for the entire
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* screen.
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*
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* @param dpiType
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* MDT_EFFECTIVE_DPI = 0,
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* The effective DPI. This value should be used when determining the correct scale factor for scaling UI elements. This
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* incorporates the scale factor set by the user for this specific display.
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* MDT_ANGULAR_DPI = 1,
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* The angular DPI. This DPI ensures rendering at a compliant angular resolution on the screen. This does not include the
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* scale factor set by the user for this specific display.
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* MDT_RAW_DPI = 2,
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* The raw DPI. This value is the linear DPI of the screen as measured on the screen itself. Use this value when you want
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* to read the pixel density and not the recommended scaling setting. This does not include the scale factor set by the user
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* for this specific display and is not guaranteed to be a supported DPI value.
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* MDT_DEFAULT = MDT_EFFECTIVE_DPI
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*
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*
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* @return if the function succeeds, the return value is a handle to the DC for the specified window's client area. If the function
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* fails, the return value is NULL.
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*/
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public static
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WinNT.HRESULT GetDpiForMonitor(WinUser.HMONITOR hMonitor, int dpiType, IntByReference dpiX, IntByReference dpiY) {
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if (GetDpiForMonitor != null) {
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// HRESULT GetDpiForMonitor(HMONITOR hmonitor, MONITOR_DPI_TYPE dpiType, UINT *dpiX, UINT *dpiY);
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return (WinNT.HRESULT) GetDpiForMonitor.invoke(WinNT.HRESULT.class, new Object[]{hMonitor.getPointer(), dpiType, dpiX, dpiY});
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} else {
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return null;
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}
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}
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/**
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* https://learn.microsoft.com/en-us/windows/win32/api/shellscalingapi/nf-shellscalingapi-setprocessdpiawareness
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*/
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public static int SetProcessDpiAwareness(int value) {
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if (SetProcessDpiAwareness != null) {
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// HRESULT SetProcessDpiAwareness(
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// [in] PROCESS_DPI_AWARENESS value
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// );
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return (int) SetProcessDpiAwareness.invoke(Integer.class, new Object[]{value});
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} else {
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return -1;
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}
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}
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}
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