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using System;
using System.Diagnostics;
using System.Numerics;
using System.Runtime.CompilerServices;
namespace Ryujinx.Graphics.Nvdec.Vp9.Common
{
internal static class BitUtils
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static byte ClipPixel(int val)
{
return (byte)((val > 255) ? 255 : (val < 0) ? 0 : val);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ushort ClipPixelHighbd(int val, int bd)
{
return bd switch
{
10 => (ushort)Math.Clamp(val, 0, 1023),
12 => (ushort)Math.Clamp(val, 0, 4095),
_ => (ushort)Math.Clamp(val, 0, 255),
};
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int RoundPowerOfTwo(int value, int n)
{
return (value + (1 << (n - 1))) >> n;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static long RoundPowerOfTwo(long value, int n)
{
return (value + (1L << (n - 1))) >> n;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int AlignPowerOfTwo(int value, int n)
{
return (value + ((1 << n) - 1)) & ~((1 << n) - 1);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static int GetMsb(uint n)
{
Debug.Assert(n != 0);
return 31 ^ BitOperations.LeadingZeroCount(n);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int GetUnsignedBits(uint numValues)
{
return numValues > 0 ? GetMsb(numValues) + 1 : 0;
}
}
}
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