77 lines
2.3 KiB
C#
77 lines
2.3 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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using System.Runtime.Versioning;
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namespace Ryujinx.Common.System
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{
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[SupportedOSPlatform("windows")]
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public static class GdiPlusHelper
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{
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private const string LibraryName = "gdiplus.dll";
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private static readonly IntPtr _initToken;
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static GdiPlusHelper()
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{
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CheckStatus(GdiplusStartup(out _initToken, StartupInputEx.Default, out _));
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}
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private static void CheckStatus(int gdiStatus)
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{
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if (gdiStatus != 0)
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{
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throw new Exception($"GDI Status Error: {gdiStatus}");
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}
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}
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private struct StartupInputEx
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{
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public int GdiplusVersion;
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#pragma warning disable CS0649
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public IntPtr DebugEventCallback;
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public int SuppressBackgroundThread;
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public int SuppressExternalCodecs;
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public int StartupParameters;
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#pragma warning restore CS0649
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public static StartupInputEx Default => new StartupInputEx
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{
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// We assume Windows 8 and upper
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GdiplusVersion = 2,
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DebugEventCallback = IntPtr.Zero,
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SuppressBackgroundThread = 0,
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SuppressExternalCodecs = 0,
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StartupParameters = 0,
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};
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}
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private struct StartupOutput
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{
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public IntPtr NotificationHook;
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public IntPtr NotificationUnhook;
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}
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[DllImport(LibraryName)]
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private static extern int GdiplusStartup(out IntPtr token, in StartupInputEx input, out StartupOutput output);
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[DllImport(LibraryName)]
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private static extern int GdipCreateFromHWND(IntPtr hwnd, out IntPtr graphics);
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[DllImport(LibraryName)]
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private static extern int GdipDeleteGraphics(IntPtr graphics);
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[DllImport(LibraryName)]
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private static extern int GdipGetDpiX(IntPtr graphics, out float dpi);
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public static float GetDpiX(IntPtr hwnd)
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{
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CheckStatus(GdipCreateFromHWND(hwnd, out IntPtr graphicsHandle));
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CheckStatus(GdipGetDpiX(graphicsHandle, out float result));
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CheckStatus(GdipDeleteGraphics(graphicsHandle));
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return result;
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}
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}
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}
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