46 lines
1.5 KiB
C#
46 lines
1.5 KiB
C#
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/*
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* Copyright (C) 2021 because-why-not.com Limited
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*
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* Please refer to the license.txt for license information
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*/
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using System;
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using System.Runtime.InteropServices;
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using UnityEngine;
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namespace Byn.Awrtc.Unity
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{
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/// <summary>
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/// Unity helper functions that are used in multiple parts of the asset
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/// </summary>
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public static class UnityHelper
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{
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/// <summary>
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/// WARNING: This function is inherently unsafe and can cause crashes easily.
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/// It pins an Color32 array returned by unity and gives the IntPtr to the
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/// raw memory to a callback. It makes sure the memory is released.
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/// Avoid this method whenever possible.
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///
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/// If you end up here investigating a crash the reason is likely here or in the
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/// callback being called.
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/// </summary>
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/// <param name="arg">Array of Color32 structs</param>
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/// <param name="callback">Callback receiving the IntPtr to the raw memory and its byte length
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/// </param>
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public static void PtrFromColor32(Color32[] arg, Action<IntPtr, uint> callback)
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{
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GCHandle handle = GCHandle.Alloc(arg, GCHandleType.Pinned);
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try
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{
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uint structSize = (uint)Marshal.SizeOf(typeof(Color32));
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uint size = ((uint)arg.Length) * structSize;
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callback(handle.AddrOfPinnedObject(), size);
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}
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finally
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{
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handle.Free();
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}
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}
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}
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}
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