Ryujinx/Ryujinx.Common/System/GdiPlusHelper.cs
Mary-nyan 872f036d64
misc: Remove dependency on System.Drawing.Common (#4082)
We only used it in one spot for DPI scaling factor.

This implements the same behaviour using gdiplus.

This remove 700KB of dependency to download and around 170KB unpacked.
2022-12-09 18:00:53 +01:00

77 lines
2.3 KiB
C#

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