1  using System;
 2  using System.Diagnostics;
 3  using System.Numerics;
 4  using System.Runtime.CompilerServices;
 5  
 6  namespace Ryujinx.Graphics.Nvdec.Vp9.Common
 7  {
 8      internal static class BitUtils
 9      {
10          [MethodImpl(MethodImplOptions.AggressiveInlining)]
11          public static byte ClipPixel(int val)
12          {
13              return (byte)((val > 255) ? 255 : (val < 0) ? 0 : val);
14          }
15  
16          [MethodImpl(MethodImplOptions.AggressiveInlining)]
17          public static ushort ClipPixelHighbd(int val, int bd)
18          {
19              return bd switch
20              {
21                  10 => (ushort)Math.Clamp(val, 0, 1023),
22                  12 => (ushort)Math.Clamp(val, 0, 4095),
23                  _ => (ushort)Math.Clamp(val, 0, 255),
24              };
25          }
26  
27          [MethodImpl(MethodImplOptions.AggressiveInlining)]
28          public static int RoundPowerOfTwo(int value, int n)
29          {
30              return (value + (1 << (n - 1))) >> n;
31          }
32  
33          [MethodImpl(MethodImplOptions.AggressiveInlining)]
34          public static long RoundPowerOfTwo(long value, int n)
35          {
36              return (value + (1L << (n - 1))) >> n;
37          }
38  
39          [MethodImpl(MethodImplOptions.AggressiveInlining)]
40          public static int AlignPowerOfTwo(int value, int n)
41          {
42              return (value + ((1 << n) - 1)) & ~((1 << n) - 1);
43          }
44  
45          [MethodImpl(MethodImplOptions.AggressiveInlining)]
46          private static int GetMsb(uint n)
47          {
48              Debug.Assert(n != 0);
49  
50              return 31 ^ BitOperations.LeadingZeroCount(n);
51          }
52  
53          [MethodImpl(MethodImplOptions.AggressiveInlining)]
54          public static int GetUnsignedBits(uint numValues)
55          {
56              return numValues > 0 ? GetMsb(numValues) + 1 : 0;
57          }
58      }
59  }