47 lines
2.1 KiB
C#
47 lines
2.1 KiB
C#
using System.Diagnostics;
|
|
|
|
namespace Ryujinx.Graphics.Nvdec.Vp9
|
|
{
|
|
internal static class DSubExp
|
|
{
|
|
public static int InvRecenterNonneg(int v, int m)
|
|
{
|
|
if (v > 2 * m)
|
|
{
|
|
return v;
|
|
}
|
|
|
|
return (v & 1) != 0 ? m - ((v + 1) >> 1) : m + (v >> 1);
|
|
}
|
|
|
|
private static readonly byte[] InvMapTable =
|
|
{
|
|
7, 20, 33, 46, 59, 72, 85, 98, 111, 124, 137, 150, 163, 176, 189, 202, 215, 228, 241, 254, 1, 2, 3, 4,
|
|
5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34,
|
|
35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62,
|
|
63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 86, 87, 88, 89, 90,
|
|
91, 92, 93, 94, 95, 96, 97, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 112, 113, 114,
|
|
115, 116, 117, 118, 119, 120, 121, 122, 123, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136,
|
|
138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 151, 152, 153, 154, 155, 156, 157, 158, 159,
|
|
160, 161, 162, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 177, 178, 179, 180, 181, 182,
|
|
183, 184, 185, 186, 187, 188, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 203, 204, 205,
|
|
206, 207, 208, 209, 210, 211, 212, 213, 214, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227,
|
|
229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 242, 243, 244, 245, 246, 247, 248, 249, 250,
|
|
251, 252, 253, 253
|
|
};
|
|
|
|
public static int InvRemapProb(int v, int m)
|
|
{
|
|
Debug.Assert(v < InvMapTable.Length / sizeof(byte));
|
|
|
|
v = InvMapTable[v];
|
|
m--;
|
|
if (m << 1 <= Prob.MaxProb)
|
|
{
|
|
return 1 + InvRecenterNonneg(v, m);
|
|
}
|
|
|
|
return Prob.MaxProb - InvRecenterNonneg(v, Prob.MaxProb - 1 - m);
|
|
}
|
|
}
|
|
} |