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