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[CoreGraphics] Implement getting the refresh rate for a CGDisplay. Fixes #9958. #23922

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Merged
merged 3 commits into from
Oct 13, 2025
Merged

[CoreGraphics] Implement getting the refresh rate for a CGDisplay. Fixes #9958. #23922

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e391b39
[CoreGraphics] Implement getting the refresh rate for a CGDisplay. Fi…
rolfbjarne Sep 26, 2025
c99a2c3
Add test
rolfbjarne Oct 10, 2025
f3176b4
Fix xtro
rolfbjarne Oct 10, 2025
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22 changes: 22 additions & 0 deletions src/CoreGraphics/CGDisplay.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -271,6 +271,28 @@ public static int GetShieldingWindowID (int display)
public static int ShieldingWindowLevel {
get { return CGShieldingWindowLevel (); }
}

[DllImport (Constants.CoreGraphicsLibrary)]
extern static IntPtr CGDisplayCopyDisplayMode (uint display);

[DllImport (Constants.CoreGraphicsLibrary)]
extern static void CGDisplayModeRelease (IntPtr mode);

[DllImport (Constants.CoreGraphicsLibrary)]
extern static double CGDisplayModeGetRefreshRate (IntPtr mode);

/// <summary>Get the refresh rate for the specified display.</summary>
/// <param name="display">The identifier for the display.</param>
/// <returns>The display rate, in hertz, of the specified display, or <see langword="null" /> in case of failure.</returns>
public static double? GetRefreshRate (int display)
{
var mode = CGDisplayCopyDisplayMode ((uint) display);
if (mode == IntPtr.Zero)
return null;
var refreshRate = CGDisplayModeGetRefreshRate (mode);
CGDisplayModeRelease (mode);
return refreshRate;
}
#endif
}
}
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28 changes: 28 additions & 0 deletions tests/monotouch-test/CoreGraphics/CGDisplayTest.cs
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@@ -0,0 +1,28 @@
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

using System;

using Foundation;
using ObjCRuntime;
using CoreGraphics;

using NUnit.Framework;

#if __MONOMAC__ || __MACCATALYST__

namespace MonoTouchFixtures.CoreGraphics {

[TestFixture]
[Preserve (AllMembers = true)]
public class CGDisplayTest {

[Test]
public void GetRefreshRate ()
{
Assert.That (CGDisplay.GetRefreshRate (CGDisplay.MainDisplayID), Is.Not.EqualTo (0), "RefreshRate");
}
}
}

#endif // __MONOMAC__ || __MACCATALYST__
3 changes: 0 additions & 3 deletions tests/xtro-sharpie/api-annotations-dotnet/MacCatalyst-CoreGraphics.ignore
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Expand Up @@ -36,7 +36,6 @@
!missing-pinvoke! CGDirectDisplayCopyCurrentMetalDevice is not bound
!missing-pinvoke! CGDisplayCopyAllDisplayModes is not bound
!missing-pinvoke! CGDisplayCopyColorSpace is not bound
!missing-pinvoke! CGDisplayCopyDisplayMode is not bound
!missing-pinvoke! CGDisplayFade is not bound
!missing-pinvoke! CGDisplayGetDrawingContext is not bound
!missing-pinvoke! CGDisplayIsActive is not bound
Expand All @@ -54,10 +53,8 @@
!missing-pinvoke! CGDisplayModeGetIOFlags is not bound
!missing-pinvoke! CGDisplayModeGetPixelHeight is not bound
!missing-pinvoke! CGDisplayModeGetPixelWidth is not bound
!missing-pinvoke! CGDisplayModeGetRefreshRate is not bound
!missing-pinvoke! CGDisplayModeGetWidth is not bound
!missing-pinvoke! CGDisplayModeIsUsableForDesktopGUI is not bound
!missing-pinvoke! CGDisplayModeRelease is not bound
!missing-pinvoke! CGDisplayModeRetain is not bound
!missing-pinvoke! CGDisplayModelNumber is not bound
!missing-pinvoke! CGDisplayPrimaryDisplay is not bound
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3 changes: 0 additions & 3 deletions tests/xtro-sharpie/api-annotations-dotnet/macOS-CoreGraphics.ignore
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,6 @@
!missing-pinvoke! CGDirectDisplayCopyCurrentMetalDevice is not bound
!missing-pinvoke! CGDisplayCopyAllDisplayModes is not bound
!missing-pinvoke! CGDisplayCopyColorSpace is not bound
!missing-pinvoke! CGDisplayCopyDisplayMode is not bound
!missing-pinvoke! CGDisplayFade is not bound
!missing-pinvoke! CGDisplayGetDrawingContext is not bound
!missing-pinvoke! CGDisplayIsActive is not bound
Expand All @@ -53,11 +52,9 @@
!missing-pinvoke! CGDisplayModeGetIOFlags is not bound
!missing-pinvoke! CGDisplayModeGetPixelHeight is not bound
!missing-pinvoke! CGDisplayModeGetPixelWidth is not bound
!missing-pinvoke! CGDisplayModeGetRefreshRate is not bound
!missing-pinvoke! CGDisplayModeGetWidth is not bound
!missing-pinvoke! CGDisplayModeIsUsableForDesktopGUI is not bound
!missing-pinvoke! CGDisplayModelNumber is not bound
!missing-pinvoke! CGDisplayModeRelease is not bound
!missing-pinvoke! CGDisplayModeRetain is not bound
!missing-pinvoke! CGDisplayPrimaryDisplay is not bound
!missing-pinvoke! CGDisplayRegisterReconfigurationCallback is not bound
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