GARbro-mirror/ArcFormats/Entis/ErisaMatrix.cs
morkt 6a89368023 added broken implementation of ERI lossy images.
also reorganized Entis-related classes and enums. static math methods
moved to separate static class.
2016-02-29 12:35:48 +04:00

489 lines
18 KiB
C#

//! \file ErisaMatrix.cs
//! \date Fri Feb 26 01:12:26 2016
//! \brief Erisa Library math methods.
//
// *****************************************************************************
// E R I S A - L i b r a r y
// ----------------------------------------------------------------------------
// Copyright (C) 2000-2004 Leshade Entis. All rights reserved.
// *****************************************************************************/
//
// C# port by morkt
//
using System;
using System.Diagnostics;
using GameRes.Utility;
namespace GameRes.Formats.Entis
{
internal static class Erisa
{
public const int MIN_DCT_DEGREE = 2;
public const int MAX_DCT_DEGREE = 12;
static readonly float ERI_rCosPI4 = (float)Math.Cos (Math.PI / 4);
static readonly float ERI_r2CosPI4 = 2 * ERI_rCosPI4;
static readonly float[] ERI_DCTofK2 = new float[2];
static readonly float[][] ERI_pMatrixDCTofK = new float[MAX_DCT_DEGREE][]
{
null,
ERI_DCTofK2, // = cos( (2*i+1) / 8 )
new float[4], // = cos( (2*i+1) / 16 )
new float[8], // = cos( (2*i+1) / 32 )
new float[16], // = cos( (2*i+1) / 64 )
new float[32], // = cos( (2*i+1) / 128 )
new float[64], // = cos( (2*i+1) / 256 )
new float[128], // = cos( (2*i+1) / 512 )
new float[256], // = cos( (2*i+1) / 1024 )
new float[512], // = cos( (2*i+1) / 2048 )
new float[1024], // = cos( (2*i+1) / 4096 )
new float[2048], // = cos( (2*i+1) / 8192 )
};
static Erisa ()
{
InitializeMatrix();
}
public static void InitializeMatrix ()
{
for (int i = 1; i < MAX_DCT_DEGREE; i++)
{
int n = (1 << i);
float[] pDCTofK = ERI_pMatrixDCTofK[i];
double nr = Math.PI / (4.0 * n);
double dr = nr + nr;
double ir = nr;
for (int j = 0; j < n; j++)
{
pDCTofK[j] = (float)Math.Cos (ir);
ir += dr;
}
}
}
public static void RoundR32ToWordArray (byte[] ptrDst, int dst, int nStep, float[] ptrSrc, int nCount)
{
nStep *= 2;
for (int i = 0; i < nCount; i++)
{
int nValue = RoundR32ToInt (ptrSrc[i]);
if (nValue <= -0x8000)
{
LittleEndian.Pack ((short)-0x8000, ptrDst, dst);
}
else if (nValue >= 0x7FFF)
{
LittleEndian.Pack ((short)0x7FFF, ptrDst, dst);
}
else
{
LittleEndian.Pack ((short)nValue, ptrDst, dst);
}
dst += nStep;
}
}
public static int RoundR32ToInt (float r)
{
if (r >= 0.0)
return (int)Math.Floor (r + 0.5);
else
return (int)Math.Ceiling (r - 0.5);
}
public static EriSinCos[] CreateRevolveParameter (int nDegreeDCT)
{
int nDegreeNum = 1 << nDegreeDCT;
int lc = 1;
for (int n = nDegreeNum / 2; n >= 8; n /= 8)
{
++lc;
}
EriSinCos[] ptrRevolve = new EriSinCos[lc*8];
double k = Math.PI / (nDegreeNum * 2);
int ptrNextRev = 0;
int nStep = 2;
do
{
for (int i = 0; i < 7; i++)
{
double ws = 1.0;
double a = 0.0;
for (int j = 0; j < i; j++)
{
a += nStep;
ws = ws * ptrRevolve[ptrNextRev+j].rSin + ptrRevolve[ptrNextRev+j].rCos * Math.Cos (a * k);
}
double r = Math.Atan2 (ws, Math.Cos ((a + nStep) * k));
ptrRevolve[ptrNextRev+i].rSin = (float)Math.Sin (r);
ptrRevolve[ptrNextRev+i].rCos = (float)Math.Cos (r);
}
ptrNextRev += 7;
nStep *= 8;
}
while (nStep < nDegreeNum);
return ptrRevolve;
}
public static void OddGivensInverseMatrix (float[] ptrSrc, int src, EriSinCos[] ptrRevolve, int nDegreeDCT)
{
int nDegreeNum = 1 << nDegreeDCT;
int index = 1;
int nStep = 2;
int lc = (nDegreeNum / 2) / 8;
int resolve_idx = 0;
for (;;)
{
resolve_idx += 7;
index += nStep * 7;
nStep *= 8;
if (lc <= 8)
break;
lc /= 8;
}
int k = index + nStep * (lc - 2);
int j;
float r1, r2;
for (j = lc - 2; j >= 0; j--)
{
r1 = ptrSrc[src + k];
r2 = ptrSrc[src + k + nStep];
ptrSrc[src + k] = r1 * ptrRevolve[resolve_idx+j].rCos + r2 * ptrRevolve[resolve_idx+j].rSin;
ptrSrc[src + k + nStep] = r2 * ptrRevolve[resolve_idx+j].rCos - r1 * ptrRevolve[resolve_idx+j].rSin;
k -= nStep;
}
for (; lc <= (nDegreeNum / 2) / 8; lc *= 8)
{
resolve_idx -= 7;
nStep /= 8;
index -= nStep * 7;
for (int i = 0; i < lc; i++)
{
k = i * (nStep * 8) + index + nStep * 6;
for ( j = 6; j >= 0; j -- )
{
r1 = ptrSrc[src + k];
r2 = ptrSrc[src + k + nStep];
ptrSrc[src + k] =
r1 * ptrRevolve[resolve_idx+j].rCos + r2 * ptrRevolve[resolve_idx+j].rSin;
ptrSrc[src + k + nStep] =
r2 * ptrRevolve[resolve_idx+j].rCos - r1 * ptrRevolve[resolve_idx+j].rSin;
k -= nStep;
}
}
}
}
public static void FastIPLOT (float[] ptrSrc, int src, int nDegreeDCT)
{
int nDegreeNum = 1 << nDegreeDCT;
for (int i = 0; i < nDegreeNum; i += 2)
{
float r1 = ptrSrc[src + i];
float r2 = ptrSrc[src + i + 1];
ptrSrc[src + i] = 0.5f * (r1 + r2);
ptrSrc[src + i + 1] = 0.5f * (r1 - r2);
}
}
public static void FastILOT (float[] ptrDst, float[] ptrSrc1, int src1, float[] ptrSrc2, int src2, int nDegreeDCT)
{
int nDegreeNum = 1 << nDegreeDCT;
for (int i = 0; i < nDegreeNum; i += 2)
{
float r1 = ptrSrc1[src1 + i];
float r2 = ptrSrc2[src2 + i + 1];
ptrDst[i] = r1 + r2;
ptrDst[i + 1] = r1 - r2;
}
}
public static void FastDCT (float[] ptrDst, int dst, int nDstInterval, float[] ptrSrc, int src, float[] ptrWorkBuf, int work, int nDegreeDCT)
{
Debug.Assert ((nDegreeDCT >= MIN_DCT_DEGREE) && (nDegreeDCT <= MAX_DCT_DEGREE));
if (nDegreeDCT == MIN_DCT_DEGREE)
{
float[] r32Buf = new float[4];
r32Buf[0] = ptrSrc[src] + ptrSrc[src+3];
r32Buf[2] = ptrSrc[src] - ptrSrc[src+3];
r32Buf[1] = ptrSrc[src+1] + ptrSrc[src+2];
r32Buf[3] = ptrSrc[src+1] - ptrSrc[src+2];
ptrDst[dst] = 0.5f * (r32Buf[0] + r32Buf[1]);
ptrDst[dst+nDstInterval * 2] = ERI_rCosPI4 * (r32Buf[0] - r32Buf[1]);
r32Buf[2] = ERI_DCTofK2[0] * r32Buf[2];
r32Buf[3] = ERI_DCTofK2[1] * r32Buf[3];
r32Buf[0] = r32Buf[2] + r32Buf[3];
r32Buf[1] = ERI_r2CosPI4 * (r32Buf[2] - r32Buf[3]);
r32Buf[1] -= r32Buf[0];
ptrDst[dst+nDstInterval] = r32Buf[0];
ptrDst[dst+nDstInterval * 3] = r32Buf[1];
}
else
{
uint i;
uint nDegreeNum = 1u << nDegreeDCT;
uint nHalfDegree = nDegreeNum >> 1;
for (i = 0; i < nHalfDegree; i++)
{
ptrWorkBuf[work+i] = ptrSrc[src+i] + ptrSrc[src + nDegreeNum - i - 1];
ptrWorkBuf[work+i + nHalfDegree] = ptrSrc[src+i] - ptrSrc[src + nDegreeNum - i - 1];
}
int nDstStep = nDstInterval << 1;
FastDCT (ptrDst, dst, nDstStep, ptrWorkBuf, work, ptrSrc, src, nDegreeDCT - 1);
float[] pDCTofK = ERI_pMatrixDCTofK[nDegreeDCT - 1];
src = (int)(work+nHalfDegree); // ptrSrc = ptrWorkBuf + nHalfDegree;
dst += nDstInterval; // ptrDst += nDstInterval;
for (i = 0; i < nHalfDegree; i++)
{
ptrWorkBuf[src + i] *= pDCTofK[i];
}
FastDCT (ptrDst, dst, nDstStep, ptrWorkBuf, src, ptrWorkBuf, work, nDegreeDCT - 1);
int ptrNext = dst; // within ptrDst;
for (i = 0; i < nHalfDegree; i++)
{
ptrDst[ptrNext] += ptrDst[ptrNext]; // *ptrNext += *ptrNext;
ptrNext += nDstStep;
}
ptrNext = dst;
for (i = 1; i < nHalfDegree; i ++)
{
ptrDst[ptrNext + nDstStep] -= ptrDst[ptrNext];
ptrNext += nDstStep;
}
}
}
public static void FastIDCT (float[] ptrDst, float[] srcBuf, int ptrSrc, int nSrcInterval, float[] ptrWorkBuf, int nDegreeDCT)
{
FastIDCT (ptrDst, 0, srcBuf, ptrSrc, nSrcInterval, ptrWorkBuf, nDegreeDCT);
}
public static void FastIDCT (float[] dstBuf, int ptrDst, float[] srcBuf, int ptrSrc, int nSrcInterval, float[] ptrWorkBuf, int nDegreeDCT)
{
Debug.Assert ((nDegreeDCT >= MIN_DCT_DEGREE) && (nDegreeDCT <= MAX_DCT_DEGREE));
if (nDegreeDCT == MIN_DCT_DEGREE)
{
float[] r32Buf1 = new float[2];
float[] r32Buf2 = new float[4];
r32Buf1[0] = srcBuf[ptrSrc];
r32Buf1[1] = ERI_rCosPI4 * srcBuf[ptrSrc + nSrcInterval * 2];
r32Buf2[0] = r32Buf1[0] + r32Buf1[1];
r32Buf2[1] = r32Buf1[0] - r32Buf1[1];
r32Buf1[0] = ERI_DCTofK2[0] * srcBuf[ptrSrc + nSrcInterval];
r32Buf1[1] = ERI_DCTofK2[1] * srcBuf[ptrSrc + nSrcInterval * 3];
r32Buf2[2] = r32Buf1[0] + r32Buf1[1];
r32Buf2[3] = ERI_r2CosPI4 * (r32Buf1[0] - r32Buf1[1]);
r32Buf2[3] -= r32Buf2[2];
dstBuf[ptrDst] = r32Buf2[0] + r32Buf2[2];
dstBuf[ptrDst+3] = r32Buf2[0] - r32Buf2[2];
dstBuf[ptrDst+1] = r32Buf2[1] + r32Buf2[3];
dstBuf[ptrDst+2] = r32Buf2[1] - r32Buf2[3];
}
else
{
uint nDegreeNum = 1u << nDegreeDCT;
uint nHalfDegree = nDegreeNum >> 1;
int nSrcStep = nSrcInterval << 1;
FastIDCT (dstBuf, ptrDst, srcBuf, ptrSrc, nSrcStep, ptrWorkBuf, nDegreeDCT - 1);
float[] pDCTofK = ERI_pMatrixDCTofK[nDegreeDCT - 1];
int pOddDst = ptrDst + (int)nHalfDegree; // within dstBuf
int ptrNext = ptrSrc + nSrcInterval; // within srcBuf
uint i;
for (i = 0; i < nHalfDegree; i++)
{
ptrWorkBuf[i] = srcBuf[ptrNext] * pDCTofK[i];
ptrNext += nSrcStep;
}
FastDCT (dstBuf, pOddDst, 1, ptrWorkBuf, 0, ptrWorkBuf, (int)nHalfDegree, nDegreeDCT - 1);
for (i = 0; i < nHalfDegree; i ++)
{
dstBuf[pOddDst + i] += dstBuf[pOddDst + i];
}
for (i = 1; i < nHalfDegree; i++)
{
dstBuf[pOddDst + i] -= dstBuf[pOddDst + i - 1];
}
float[] r32Buf = new float[4];
uint nQuadDegree = nHalfDegree >> 1;
for (i = 0; i < nQuadDegree; i++)
{
r32Buf[0] = dstBuf[ptrDst+i] + dstBuf[nHalfDegree + i];
r32Buf[3] = dstBuf[ptrDst+i] - dstBuf[nHalfDegree + i];
r32Buf[1] = dstBuf[nHalfDegree - 1 - i] + dstBuf[ptrDst + nDegreeNum - 1 - i];
r32Buf[2] = dstBuf[nHalfDegree - 1 - i] - dstBuf[ptrDst + nDegreeNum - 1 - i];
dstBuf[ptrDst+i] = r32Buf[0];
dstBuf[nHalfDegree - 1 - i] = r32Buf[1];
dstBuf[nHalfDegree + i] = r32Buf[2];
dstBuf[ptrDst+nDegreeNum - 1 - i] = r32Buf[3];
}
}
}
public static void Revolve2x2 (float[] buf1, int ptrBuf1, float[] buf2, int ptrBuf2, float rSin, float rCos, int nStep, int nCount)
{
for (int i = 0; i < nCount; i++)
{
float r1 = buf1[ptrBuf1];
float r2 = buf2[ptrBuf2];
buf1[ptrBuf1] = r1 * rCos - r2 * rSin;
buf2[ptrBuf2] = r1 * rSin + r2 * rCos;
ptrBuf1 += nStep;
ptrBuf2 += nStep;
}
}
public static void ConvertArraySByteToFloat (float[] ptrDst, sbyte[] ptrSrc, int src, int nCount)
{
for (int i = 0; i < nCount; ++i)
{
ptrDst[i] = ptrSrc[src+i];
}
}
public static void VectorMultiply (float[] ptrDst, float[] ptrSrc, int src, int nCount)
{
for (int i = 0; i < nCount; ++i)
{
ptrDst[i] *= ptrSrc[src+i];
}
}
public static void FastIDCT8x8 (float[] ptrDst)
{
var rWork = new float[8];
var rTemp = new float[64];
for (int i = 0; i < 8; ++i)
FastIDCT (rTemp, i * 8, ptrDst, i, 8, rWork, 3);
for (int i = 0; i < 8; ++i)
FastIDCT (ptrDst, i * 8, rTemp, i, 8, rWork, 3);
}
static readonly EriSinCos[] escRev = new EriSinCos[3]
{
new EriSinCos { rSin = 0.734510f, rCos = 0.678598f },
new EriSinCos { rSin = 0.887443f, rCos = 0.460917f },
new EriSinCos { rSin = 0.970269f, rCos = 0.242030f }
};
public static void FastILOT8x8 (float[] ptrDst, float[] horz, int ptrHorzCur, float[] vert, int ptrVertCur)
{
var rWork = new float[8];
var rTemp = new float[64];
float s1, s2, r1, r2, r3;
int i, j, k;
for (i = 0; i < 8; i++)
{
for (j = 2, k = i + 40; j >= 0; j--, k -= 16)
{
r1 = ptrDst[k];
r2 = ptrDst[k + 16];
ptrDst[k] = r1 * escRev[j].rCos + r2 * escRev[j].rSin;
ptrDst[k + 16] = r2 * escRev[j].rCos - r1 * escRev[j].rSin;
}
}
for (i = 0; i < 64; i += 16)
{
for (j = 0; j < 8; j++)
{
k = i + j;
s1 = ptrDst[k];
s2 = ptrDst[k + 8];
r1 = 0.5f * (s1 + s2);
r2 = 0.5f * (s1 - s2);
r3 = vert[ptrVertCur+k];
vert[ptrVertCur+k] = r1;
vert[ptrVertCur+k + 8] = r2;
ptrDst[k] = r3 + r2;
ptrDst[k + 8] = r3 - r2;
}
}
for (i = 0; i < 64; i += 8)
{
for (j = 2, k = i + 5; j >= 0; j--, k -= 2)
{
r1 = ptrDst[k];
r2 = ptrDst[k + 2];
ptrDst[k] = r1 * escRev[j].rCos + r2 * escRev[j].rSin;
ptrDst[k + 2] = r2 * escRev[j].rCos - r1 * escRev[j].rSin;
}
for ( j = 0; j < 8; j += 2 )
{
k = i + j;
s1 = ptrDst[k];
s2 = ptrDst[k + 1];
r1 = 0.5f * (s1 + s2);
r2 = 0.5f * (s1 - s2);
r3 = horz[ptrHorzCur+k];
horz[ptrHorzCur+k] = r1;
horz[ptrHorzCur+k + 1] = r2;
ptrDst[k] = r3 + r2;
ptrDst[k + 1] = r3 - r2;
}
}
for (i = 0; i < 8; i++)
FastIDCT (rTemp, i * 8, ptrDst, i, 8, rWork, 3);
for (i = 0; i < 8; i++)
FastIDCT (ptrDst, i * 8, rTemp, i, 8, rWork, 3);
}
public static void ConvertArrayFloatToByte (sbyte[] ptrDst, float[] ptrSrc, int nCount)
{
for (int i = 0; i < nCount; i++)
{
int n = RoundR32ToInt (ptrSrc[i]);
if ((uint)n > 0xFF)
{
n = (~n >> 31) & 0xFF;
}
ptrDst[i] = (sbyte)n;
}
}
public static void ConvertArrayFloatToSByte (sbyte[] ptrDst, float[] ptrSrc, int nCount)
{
for (int i = 0; i < nCount; i++)
{
int n = RoundR32ToInt (ptrSrc[i]);
if (n < -0x80)
n = -0x80;
else if (n > 0x7F)
n = 0x7F;
ptrDst[i] = (sbyte)n;
}
}
}
}