/*---------------------------------------------------------------------------*
  Project:  TwlSDK - PRC - 
  File:     prc_algo_superfine.c

  Copyright 2003-2008 Nintendo. All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law. They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Date:: 2008-09-18#$
  $Rev: 8573 $
  $Author: okubata_ryoma $
 *---------------------------------------------------------------------------*/

#include <nitro.h>
#include <nitro/prc/algo_superfine.h>

/*===========================================================================*
  Prototype Declarations
 *===========================================================================*/

static inline u32 PRCi_GetPatternLocalBufferSize_Superfine(void);

static void
PRCi_CalcStrokeDistance_Superfine(fx32 *score,
                                  fx32 *weight,
                                  const PRCiPatternData_Common *inputData,
                                  const PRCiPatternData_Common *protoData,
                                  int normalizeSize,
                                  int lengthFilterThreshold,
                                  int lengthFilterRatio, int iStroke, void *buffer);

/*===========================================================================*
  Variable Definitions
 *===========================================================================*/

/*===========================================================================*
  Functions
 *===========================================================================*/

/*---------------------------------------------------------------------------*
  Name:         PRC_GetRecognitionBufferSizeEx_Superfine

  Description:  Calculates the work area size required for recognition algorithm.
                

  Arguments:    maxPointCount: Upper limit of number of input points (includes pen up marker)
                maxStrokeCount: Upper limit of stroke count
                protoDB: Sample DB
                param: Parameters for recognition processing

  Returns:      The memory capacity required for the recognition algorithm.
 *---------------------------------------------------------------------------*/
u32
PRC_GetRecognitionBufferSizeEx_Superfine(int maxPointCount,
                                         int maxStrokeCount,
                                         const PRCPrototypeDB_Superfine *protoDB,
                                         const PRCRecognizeParam_Superfine *param)
{
    u32     size = 0;

    (void)maxStrokeCount;
    (void)param;

    if (maxPointCount < protoDB->maxPointCount)
    {
        maxPointCount = protoDB->maxPointCount;
    }

    size += PRCi_ARRAY_SIZE(int, maxPointCount * maxPointCount,);
    size += PRCi_ARRAY_SIZE(int, maxPointCount * maxPointCount,);
    size += PRCi_ARRAY_SIZE(int, maxPointCount * maxPointCount,);
    size += PRCi_ARRAY_SIZE(int, ((maxPointCount + 1) * (maxPointCount + 1)),);
    size += PRCi_ARRAY_SIZE(int, maxPointCount,);
    size += PRCi_ARRAY_SIZE(int, maxPointCount,);
    size += PRCi_ARRAY_SIZE(int, maxPointCount,);
    size += PRCi_ARRAY_SIZE(int, maxPointCount,);
    size += PRCi_ARRAY_SIZE(int, maxPointCount + 2,);
    size += PRCi_ARRAY_SIZE(int, maxPointCount + 2,);
    return size;
}

/*---------------------------------------------------------------------------*
  Name:         PRC_GetRecognizedEntriesEx_Superfine

  Description:  Compares and recognizes a specific kind entry and input pattern to return the top numRanking ranking of the result.
                

  Arguments:    resultEntries   Pointer to array that holds pointer to recognition result.
                                If less than the requested number could be recognized, fill in remainder with NULL.
                                
                resultScores    pointer to recognition result score array
                numRanking      Number of returns to result*
                buffer      Pointer to memory region used by recognition algorithm
                                (Region size >= return value of PRC_GetRecognitionBufferSize)
                input           Input pattern
                protoDB     Sample DB
                kindMask    Carry out logical multiplication of kind value for each sample DB entry, with any non-zero values considered valid.
                                
                param       Parameters for recognition processing

  Returns:      Number of patterns in the compared sample DBs.
 *---------------------------------------------------------------------------*/
int
PRC_GetRecognizedEntriesEx_Superfine(PRCPrototypeEntry **resultEntries,
                                     fx32 *resultScores,
                                     int numRanking,
                                     void *buffer,
                                     const PRCInputPattern_Superfine *input,
                                     const PRCPrototypeDB_Superfine *protoDB,
                                     u32 kindMask, const PRCRecognizeParam_Superfine *param)
{
    int     i;
    const PRCiPatternData_Common *inputData;
    int     numCompared;
    int     normalizeSize;
    int     lengthFilterThreshold, lengthFilterRatio;

    SDK_ASSERT(resultEntries);
    SDK_ASSERT(resultScores);
    SDK_ASSERT(input);
    SDK_ASSERT(protoDB);
    SDK_ASSERT(numRanking > 0);

    for (i = 0; i < numRanking; i++)
    {
        resultEntries[i] = NULL;
        resultScores[i] = 0;
    }

    normalizeSize = protoDB->normalizeSize;
    if (normalizeSize < input->normalizeSize)
    {
        normalizeSize = input->normalizeSize;
    }

    if (param == NULL)
    {
        lengthFilterThreshold = PRC_LENGTH_FILTER_DEFAULT_THRESHOLD_SUPERFINE;
        lengthFilterRatio = PRC_LENGTH_FILTER_DEFAULT_RATIO_SUPERFINE;
    }
    else
    {
        lengthFilterThreshold = param->lengthFilterThreshold;
        lengthFilterRatio = param->lengthFilterRatio;
    }

    inputData = &input->data;
    numCompared = 0;

    {
        const PRCiPrototypeEntry_Common *proto;
        int     iPattern;

        proto = protoDB->patterns;

        for (iPattern = 0; iPattern < protoDB->patternCount; iPattern++, proto++)
        {
            const PRCiPatternData_Common *protoData;
            int     iStroke;
            fx32    wholeScore, wholeWeight;

            if (!proto->entry->enabled || !(proto->entry->kind & kindMask))
                continue;

            protoData = &proto->data;

            if (inputData->strokeCount != protoData->strokeCount)
                continue;

            numCompared++;
            wholeScore = 0;
            wholeWeight = 0;

            for (iStroke = 0; iStroke < inputData->strokeCount; iStroke++)
            {
                fx32    score, weight;

                score = 0;

                PRCi_CalcStrokeDistance_Superfine(&score, &weight, inputData, protoData,
                                                  normalizeSize, lengthFilterThreshold,
                                                  lengthFilterRatio, iStroke, buffer);

                wholeScore += score;
                wholeWeight += weight;
            }

            wholeScore = FX_Div(wholeScore, wholeWeight * normalizeSize * 2);   // normalizeSize*2 == doubleWidth

            if (wholeScore < 0)
                wholeScore = 0;
            if (wholeScore >= FX32_ONE)
                wholeScore = FX32_ONE;
            if (proto->entry->correction != 0)
            {
                wholeScore = FX_Mul(wholeScore, FX32_ONE - proto->entry->correction)
                    + proto->entry->correction;
            }

            if (resultScores[numRanking - 1] < wholeScore)
            {
                resultScores[numRanking - 1] = wholeScore;
                resultEntries[numRanking - 1] = (PRCPrototypeEntry *)proto->entry;
                for (i = numRanking - 2; i >= 0; i--)
                {
                    if (resultScores[i] < resultScores[i + 1])
                    {
                        fx32    tmpScore;
                        PRCPrototypeEntry *tmpEntry;
                        tmpScore = resultScores[i];
                        resultScores[i] = resultScores[i + 1];
                        resultScores[i + 1] = tmpScore;
                        tmpEntry = resultEntries[i];
                        resultEntries[i] = resultEntries[i + 1];
                        resultEntries[i + 1] = tmpEntry;
                    }
                }
            }
        }
    }

    return numCompared;
}

/*===========================================================================*
  Static Functions
 *===========================================================================*/
#define PRCi_SINGLE_ANGLE_SCORE 128

static inline int CityBlockDistance(const PRCPoint *p1, const PRCPoint *p2)
{
    int     x = p1->x - p2->x;
    int     y = p1->y - p2->y;
    if (x < 0)
        x = -x;
    if (y < 0)
        y = -y;
    return (x + y);
}

static inline void
GetMixedPoint(PRCPoint *p, const PRCPoint *p1, int w1, const PRCPoint *p2, int w2)
{
    int     a, w;
    a = (p1->x * w1 + p2->x * w2);
    SDK_ASSERTMSG(a >= 0, "a < 0: (%d, %d)*%d-(%d, %d)*%d", p1->x, p1->y, w1, p2->x, p2->y, w2);
    w = w1 + w2;
    SDK_ASSERTMSG(w > 0, "w <= 0: (%d, %d)*%d-(%d, %d)*%d", p1->x, p1->y, w1, p2->x, p2->y, w2);
    {
        OSIntrMode enabled;
        enabled = OS_DisableInterrupts();

        CP_SetDiv32_32((u32)a, (u32)w);
        a = (p1->y * w1 + p2->y * w2);
        p->x = CP_GetDivResult16();
        CP_SetDiv32_32((u32)a, (u32)w);
        p->y = CP_GetDivResult16();

        (void)OS_RestoreInterrupts(enabled);
    }
}

#define PRCi_ABS(x) (((x)>=0)?(x):-(x))
//#define PRCi_ANGLE_SCORE(input, proto) ((32768-PRCi_ABS((s16)(protoAngles[(proto)]-inputAngles[(input)])))/128)
//#define PRCi_ANGLE_SCORE(input, proto) ((32768*32768-((s16)(protoAngles[(proto)]-inputAngles[(input)]))*((s16)(protoAngles[(proto)]-inputAngles[(input)])))/(128*32768))
// See the above. The further up it goes, the faster it becomes. Precision does not drop that much.
#define PRCi_ANGLE_SCORE(input, proto) ((FX_CosIdx((u16)(protoAngles[(proto)]-inputAngles[(input)]))+FX32_ONE)/(FX32_ONE*2/256))

static void
PRCi_CalcStrokeDistance_Superfine(fx32 *score,
                                  fx32 *weight,
                                  const PRCiPatternData_Common *inputData,
                                  const PRCiPatternData_Common *protoData,
                                  int normalizeSize,
                                  int lengthFilterThreshold,
                                  int lengthFilterRatio, int iStroke, void *buffer)
{
#define nMatches_(x,y) (*(nMatches + (x) * maxPointCount + (y)))
#define sumScore_(x,y) (*(sumScore + (x) * maxPointCount + (y)))
#define direction_(x,y) (*(direction + (x) * maxPointCount + (y)))
#define angleScores_(x,y) (*(angleScores + (x) * (maxPointCount+1) + (y)))

    // Calculate the degree of similarity between strokes, with DP matching
    int     iInput, iProto;
    int    *nMatches;                  //[STROKE_PACKED_POINT_MAX][STROKE_PACKED_POINT_MAX];
    int    *sumScore;                  //[STROKE_PACKED_POINT_MAX][STROKE_PACKED_POINT_MAX];
    int    *direction;                 //[STROKE_PACKED_POINT_MAX][STROKE_PACKED_POINT_MAX];
    int    *angleScores;               //[STROKE_PACKED_POINT_MAX+1][STROKE_PACKED_POINT_MAX+1];

    int    *inputPair;                 //[STROKE_PACKED_POINT_MAX];
    int    *inputMaxScore;             //[STROKE_PACKED_POINT_MAX];
    int    *protoPair;                 //[STROKE_PACKED_POINT_MAX];
    int    *protoMaxScore;             //[STROKE_PACKED_POINT_MAX];
    int    *inputMatch;                //[STROKE_PACKED_POINT_MAX+2];
    int    *protoMatch;                //[STROKE_PACKED_POINT_MAX+2];

    int     protoStrokeIndex, inputStrokeIndex;
    int     protoSize, inputSize;
    const PRCPoint *protoPoints;
    const PRCPoint *inputPoints;
    const u16 *protoAngles;
    const u16 *inputAngles;
    const fx16 *protoRatios;
    const fx16 *inputRatios;
    const fx32 *protoLengths;
    const fx32 *inputLengths;
    fx32    protoStrokeLength, inputStrokeLength;
    fx32    protoStrokeRatio, inputStrokeRatio;
    int     maxPointCount;
    int     doubleWidth;

    maxPointCount = inputData->pointCount;
    if (maxPointCount < protoData->pointCount)
        maxPointCount = protoData->pointCount;

#ifdef SDK_DEBUG
    {
        int     width, tmp;

        width = inputData->wholeBoundingBox.x2 - inputData->wholeBoundingBox.x1;
        tmp = inputData->wholeBoundingBox.y2 - inputData->wholeBoundingBox.y1;
        if (tmp > width)
            width = tmp;
        tmp = protoData->wholeBoundingBox.x2 - protoData->wholeBoundingBox.x1;
        if (tmp > width)
            width = tmp;
        tmp = protoData->wholeBoundingBox.y2 - protoData->wholeBoundingBox.y1;
        if (tmp > width)
            width = tmp;

        width++;
        if (width > normalizeSize)
        {
            OS_Warning
                ("too small normalizeSize. PRCPrototypeList.normalizeSize seems too smaller than actual data.");
        }
    }
#endif
    doubleWidth = normalizeSize * 2;

    // Allocate the buffer
    {
        int     addr;
        addr = 0;
        PRCi_ALLOC_ARRAY(nMatches, int, maxPointCount * maxPointCount, buffer, addr);
        PRCi_ALLOC_ARRAY(sumScore, int, maxPointCount * maxPointCount, buffer, addr);
        PRCi_ALLOC_ARRAY(direction, int, maxPointCount * maxPointCount, buffer, addr);
        PRCi_ALLOC_ARRAY(angleScores,
                         int, ((maxPointCount + 1) * (maxPointCount + 1)), buffer, addr);
        PRCi_ALLOC_ARRAY(inputPair, int, maxPointCount, buffer, addr);
        PRCi_ALLOC_ARRAY(inputMaxScore, int, maxPointCount, buffer, addr);
        PRCi_ALLOC_ARRAY(protoPair, int, maxPointCount, buffer, addr);
        PRCi_ALLOC_ARRAY(protoMaxScore, int, maxPointCount, buffer, addr);
        PRCi_ALLOC_ARRAY(inputMatch, int, maxPointCount + 2, buffer, addr);
        PRCi_ALLOC_ARRAY(protoMatch, int, maxPointCount + 2, buffer, addr);
    }

    protoStrokeIndex = protoData->strokes[iStroke];
    inputStrokeIndex = inputData->strokes[iStroke];
    protoSize = protoData->strokeSizes[iStroke];
    inputSize = inputData->strokeSizes[iStroke];
    protoPoints = &protoData->pointArray[protoStrokeIndex];
    inputPoints = &inputData->pointArray[inputStrokeIndex];
    protoAngles = &protoData->lineSegmentAngleArray[protoStrokeIndex];
    inputAngles = &inputData->lineSegmentAngleArray[inputStrokeIndex];
    protoRatios = &protoData->lineSegmentRatioToStrokeArray[protoStrokeIndex];
    inputRatios = &inputData->lineSegmentRatioToStrokeArray[inputStrokeIndex];
    protoLengths = &protoData->lineSegmentLengthArray[protoStrokeIndex];
    inputLengths = &inputData->lineSegmentLengthArray[inputStrokeIndex];
    protoStrokeLength = protoData->strokeLengths[iStroke];
    inputStrokeLength = inputData->strokeLengths[iStroke];
    protoStrokeRatio = protoData->strokeRatios[iStroke];
    inputStrokeRatio = inputData->strokeRatios[iStroke];

    *weight = FX32_ONE;
    *score = 0;

    if (protoSize == 0 || inputSize == 0)
        return;

    // Line segments whose length are too different will have their similarity set at 0, and no further calculation will be done
    if (inputStrokeLength > lengthFilterThreshold || protoStrokeLength > lengthFilterThreshold)
    {
        if (inputStrokeLength * lengthFilterRatio < protoStrokeLength
            || protoStrokeLength * lengthFilterRatio < inputStrokeLength)
        {
#ifdef PRC_DEBUG_RECOGNIZE_DEEPLY
            OS_Printf("Skipped because of length filter %d <=> %d\n", FX_Whole(inputStrokeLength),
                      FX_Whole(protoStrokeLength));
#endif
            return;
        }
    }

    // Calculates angleScores[][] in advance, which is scores relating to angles
    if (protoSize == 1 || inputSize == 1)
    {
        for (iInput = 0; iInput < inputSize; iInput++)
        {
            for (iProto = 0; iProto < protoSize; iProto++)
            {
                angleScores_(iInput, iProto) = PRCi_SINGLE_ANGLE_SCORE;
            }
        }
    }
    else
    {
        angleScores_(0, 0) = PRCi_ANGLE_SCORE(1, 1);
        angleScores_(inputSize, 0) = PRCi_ANGLE_SCORE(inputSize - 1, 1);
        angleScores_(0, protoSize) = PRCi_ANGLE_SCORE(1, protoSize - 1);
        angleScores_(inputSize, protoSize) = PRCi_ANGLE_SCORE(inputSize - 1, protoSize - 1);

        for (iInput = 1; iInput < inputSize; iInput++)
        {
            angleScores_(iInput, 0) = PRCi_ANGLE_SCORE(iInput, 1);
            angleScores_(iInput, protoSize) = PRCi_ANGLE_SCORE(iInput, protoSize - 1);
        }
        for (iProto = 1; iProto < protoSize; iProto++)
        {
            angleScores_(0, iProto) = PRCi_ANGLE_SCORE(1, iProto);
            angleScores_(inputSize, iProto) = PRCi_ANGLE_SCORE(inputSize - 1, iProto);
        }

        for (iInput = 1; iInput < inputSize; iInput++)
        {
            for (iProto = 1; iProto < protoSize; iProto++)
            {
                angleScores_(iInput, iProto) = PRCi_ANGLE_SCORE(iInput, iProto);
            }
        }
    }

    // Use DP matching to find corresponding points between strokes
    sumScore_(0, 0) =
        (doubleWidth - CityBlockDistance(&inputPoints[0], &protoPoints[0])) * angleScores_(0,
                                                                                           0) * 2;
    nMatches_(0, 0) = 1;
    for (iInput = 1; iInput < inputSize; iInput++)
    {
        sumScore_(iInput, 0) =
            (doubleWidth -
             CityBlockDistance(&inputPoints[iInput], &protoPoints[0])) * (angleScores_(iInput,
                                                                                       0) +
                                                                          angleScores_(iInput + 1,
                                                                                       1)) +
            sumScore_(iInput - 1, 0);
        nMatches_(iInput, 0) = nMatches_(iInput - 1, 0) + 1;
        direction_(iInput, 0) = 2;
    }
    for (iProto = 1; iProto < protoSize; iProto++)
    {
        sumScore_(0, iProto) =
            (doubleWidth -
             CityBlockDistance(&inputPoints[0], &protoPoints[iProto])) * (angleScores_(0,
                                                                                       iProto) +
                                                                          angleScores_(1,
                                                                                       iProto +
                                                                                       1)) +
            sumScore_(0, iProto - 1);
        nMatches_(0, iProto) = nMatches_(0, iProto - 1) + 1;
        direction_(0, iProto) = 1;
    }

    for (iInput = 1; iInput < inputSize; iInput++)
    {
        for (iProto = 1; iProto < protoSize; iProto++)
        {
            int     sum, n, localScore;
            int     sumMax, nMax, dirMax;

            localScore =
                (doubleWidth
                 - CityBlockDistance(&inputPoints[iInput], &protoPoints[iProto]))
                * (angleScores_(iInput, iProto) + angleScores_(iInput + 1, iProto + 1));

            dirMax = 0;
            sumMax = localScore + sumScore_(iInput - 1, iProto - 1);
            nMax = nMatches_(iInput - 1, iProto - 1) + 1;

            sum = localScore + sumScore_(iInput, iProto - 1);
            n = nMatches_(iInput, iProto - 1) + 1;
            if (sum * nMax > sumMax * n)
            {
                sumMax = sum;
                nMax = n;
                dirMax = 1;
            }

            sum = localScore + sumScore_(iInput - 1, iProto);
            n = nMatches_(iInput - 1, iProto) + 1;
            if (sum * nMax > sumMax * n)
            {
                sumMax = sum;
                nMax = n;
                dirMax = 2;
            }

            sumScore_(iInput, iProto) = sumMax;
            nMatches_(iInput, iProto) = nMax;
            direction_(iInput, iProto) = dirMax;
        }
    }

#ifdef PRC_DEBUG_RECOGNIZE
    {
        int     localScore, angleScore;
        iInput = inputSize - 1;
        iProto = protoSize - 1;
        while (!(iInput == 0 && iProto == 0))
        {
            int     dx, dy;
            dx = -1 + (direction_(iInput, iProto) & 1);
            dy = -1 + ((direction_(iInput, iProto) & 2) >> 1);
            localScore = sumScore_(iInput, iProto) - sumScore_(iInput + dx, iProto + dy);
            angleScore = angleScores_(iInput, iProto) + angleScores_(iInput + 1, iProto + 1);

            OS_Printf(" %2d <-> %2d : 0.%03d = 0.%03d * 0.%03d, average from begin: 0.%03d\n",
                      iInput, iProto, localScore / normalizeSize,
                      localScore * 512 / angleScore / normalizeSize, angleScore * 2,
                      sumScore_(iInput, iProto) / nMatches_(iInput, iProto) / normalizeSize);

            iInput += dx;
            iProto += dy;
        }
        localScore = sumScore_(iInput, iProto);
        angleScore = angleScores_(iInput, iProto) + angleScores_(iInput + 1, iProto + 1);
        OS_Printf(" %2d <-> %2d : 0.%03d = 0.%03d * 0.%03d\n", iInput, iProto,
                  localScore / normalizeSize, localScore * 512 / angleScore / normalizeSize,
                  angleScore * 2);
    }

    OS_Printf("total: %d, matches: %d\n", sumScore_(inputSize - 1, protoSize - 1),
              nMatches_(inputSize - 1, protoSize - 1));
#endif

    // Similarity calculation phase
    {
        int     iMatch;
        int     localScore;
        int     nMatches;
        fx32    weightedScore, totalWeight;

        // First, extract a pair that matches for certain 
        for (iInput = 0; iInput < inputSize; iInput++)
        {
            inputPair[iInput] = -1;
            inputMaxScore[iInput] = -1;
        }

        for (iProto = 0; iProto < protoSize; iProto++)
        {
            protoPair[iProto] = -1;
            protoMaxScore[iProto] = -1;
        }

        iInput = inputSize - 1;
        iProto = protoSize - 1;
        while (!(iInput == 0 && iProto == 0))
        {
            int     dx, dy;
            dx = -1 + (direction_(iInput, iProto) & 1);
            dy = -1 + ((direction_(iInput, iProto) & 2) >> 1);
            localScore = sumScore_(iInput, iProto) - sumScore_(iInput + dx, iProto + dy);

            if (inputMaxScore[iInput] < localScore)
            {
                inputPair[iInput] = iProto;
                inputMaxScore[iInput] = localScore;
            }

            if (protoMaxScore[iProto] < localScore)
            {
                protoPair[iProto] = iInput;
                protoMaxScore[iProto] = localScore;
            }

            iInput += dx;
            iProto += dy;
        }
        // Processing of iInput==0 && iProto==0
        localScore = sumScore_(iInput, iProto);
        if (inputMaxScore[iInput] < localScore)
        {
            inputPair[iInput] = iProto;
            inputMaxScore[iInput] = localScore;
        }

        if (protoMaxScore[iProto] < localScore)
        {
            protoPair[iProto] = iInput;
            protoMaxScore[iProto] = localScore;
        }


        // One-way matches are eliminated
        for (iInput = 0; iInput < inputSize; iInput++)
        {
            int     pair = inputPair[iInput];
            if (pair >= 0)
            {
                // Is this one (the self) the ideal pairing for the other one?
                if (protoPair[pair] != iInput)
                {
                    inputPair[iInput] = -1;
                }
            }
        }

        nMatches = 0;
        inputMatch[nMatches] = 0;
        protoMatch[nMatches] = 0;
        nMatches++;
        for (iInput = 0; iInput < inputSize; iInput++)
        {
            if (inputPair[iInput] >= 0)
            {
                inputMatch[nMatches] = iInput;
                protoMatch[nMatches] = inputPair[iInput];
                nMatches++;
            }
        }
        inputMatch[nMatches] = inputSize - 1;
        protoMatch[nMatches] = protoSize - 1;
        nMatches++;

#ifdef PRC_DEBUG_RECOGNIZE
        OS_Printf("-----\n");
        for (iMatch = 0; iMatch < nMatches; iMatch++)
        {
            OS_Printf(" <%d> v <%d>\n", inputMatch[iMatch], protoMatch[iMatch]);
        }
#endif
//#define PRC_DEBUG_RECOGNIZE_DEEPLY
        weightedScore = 0;
        totalWeight = 0;
        for (iMatch = 0; iMatch < nMatches - 1; iMatch++)
        {
            fx32    inputLocalLength, protoLocalLength;
            fx32    inputCurrentLength, protoCurrentLength;
            fx32    inputPrevSumRatio, protoPrevSumRatio;
            fx32    localScore;
            fx32    weight, tmp;
            fx32    inputNextRatio, protoNextRatio;
            fx32    inputOrigNextRatio, protoOrigNextRatio;
            int     loopEnd, i;
#ifdef PRC_DEBUG_RECOGNIZE_DEEPLY
            OS_Printf(" [%d, %d] - [%d, %d]\n", inputMatch[iMatch], protoMatch[iMatch],
                      inputMatch[iMatch + 1], protoMatch[iMatch + 1]);
#endif
            inputLocalLength = 0;
            protoLocalLength = 0;
            for (iInput = inputMatch[iMatch] + 1; iInput <= inputMatch[iMatch + 1]; iInput++)
            {
                inputLocalLength += inputLengths[iInput];
            }
            for (iProto = protoMatch[iMatch] + 1; iProto <= protoMatch[iMatch + 1]; iProto++)
            {
                protoLocalLength += protoLengths[iProto];
            }
            if (inputLocalLength == 0 && protoLocalLength == 0)
            {
                // The corresponding points [0, 0] [0, 0] can only have duplicates in the beginning
                continue;
            }
            iInput = inputMatch[iMatch] + 1;
            iProto = protoMatch[iMatch] + 1;
            inputCurrentLength = inputLengths[iInput];
            protoCurrentLength = protoLengths[iProto];
            if (inputLocalLength == 0)
            {
                inputLocalLength = inputCurrentLength = 1;
                iInput = inputMatch[iMatch + 1];
            }
            if (protoLocalLength == 0)
            {
                protoLocalLength = protoCurrentLength = 1;
                iProto = protoMatch[iMatch + 1];
            }
            inputPrevSumRatio = inputOrigNextRatio = inputNextRatio =
                FX_Div(inputCurrentLength, inputLocalLength);
            protoPrevSumRatio = protoOrigNextRatio = protoNextRatio =
                FX_Div(protoCurrentLength, protoLocalLength);
            localScore = 0;
            loopEnd = (inputMatch[iMatch + 1] - iInput) + (protoMatch[iMatch + 1] - iProto) + 1;
#ifdef PRC_DEBUG_RECOGNIZE_DEEPLY
            OS_Printf("length: %d, %d\n", inputLocalLength, protoLocalLength);
#endif
            for (i = 0; i < loopEnd; i++)
            {
#ifdef PRC_DEBUG_RECOGNIZE_DEEPLY
                OS_Printf(" [%d, %d]", iInput, iProto);
                OS_Printf("  Ratio: %3d %3d\n", FX_Whole(inputNextRatio * 100),
                          FX_Whole(protoNextRatio * 100));
#endif
                SDK_ASSERTMSG(iInput <= inputMatch[iMatch + 1],
                              "iInput(%d) > inputMatch[iMatch+1](%d)\n", iInput,
                              inputMatch[iMatch + 1]);
                SDK_ASSERTMSG(iProto <= protoMatch[iMatch + 1],
                              "iProto(%d) > protoMatch[iMatch+1](%d)\n", iProto,
                              protoMatch[iMatch + 1]);
                if (inputNextRatio <= protoNextRatio)
                {
                    fx32    ratio;
                    PRCPoint protoPoint;
#ifdef PRC_DEBUG_RECOGNIZE_DEEPLY
                    OS_Printf(" inc iInput: score=%d, ratio=%d\n",
                              FX_Whole(inputNextRatio * (angleScores_(iInput, iProto))),
                              FX_Whole(100 * inputNextRatio));
#endif
                    protoNextRatio -= inputNextRatio;
                    if (iProto > 0)
                    {
                        GetMixedPoint(&protoPoint, &protoPoints[iProto - 1], protoNextRatio,
                                      &protoPoints[iProto], protoOrigNextRatio - protoNextRatio);
                    }
                    else
                    {
                        protoPoint = protoPoints[iProto];
                    }

                    inputCurrentLength += inputLengths[iInput + 1];
                    FX_DivAsync(inputCurrentLength, inputLocalLength);

#ifdef PRC_DEBUG_CHECK_OVERFLOW
                    {
                        fx32    prevScore = localScore;
#endif
                        localScore += inputNextRatio * (angleScores_(iInput, iProto))
                            * (doubleWidth - CityBlockDistance(&inputPoints[iInput], &protoPoint));
#ifdef PRC_DEBUG_CHECK_OVERFLOW
                        if (prevScore > localScore)
                            OS_Warning("Internal Error: score overflow\n");
                    }
#endif

                    iInput++;
                    ratio = FX_GetDivResult();
                    inputOrigNextRatio = inputNextRatio = ratio - inputPrevSumRatio;
                    inputPrevSumRatio = ratio;
                }
                else
                {
                    fx32    ratio;
                    PRCPoint inputPoint;
#ifdef PRC_DEBUG_RECOGNIZE_DEEPLY
                    OS_Printf(" inc iProto: score=%d, length=%d\n",
                              FX_Whole(protoNextRatio * (angleScores_(iInput, iProto))),
                              FX_Whole(100 * protoNextRatio));
#endif
                    inputNextRatio -= protoNextRatio;
                    if (iInput > 0)
                    {
                        GetMixedPoint(&inputPoint, &inputPoints[iInput - 1], inputNextRatio,
                                      &inputPoints[iInput], inputOrigNextRatio - inputNextRatio);
                    }
                    else
                    {
                        inputPoint = inputPoints[iInput];
                    }

                    protoCurrentLength += protoLengths[iProto + 1];
                    FX_DivAsync(protoCurrentLength, protoLocalLength);

#ifdef PRC_DEBUG_CHECK_OVERFLOW
                    {
                        fx32    prevScore = localScore;
#endif
                        localScore += protoNextRatio * (angleScores_(iInput, iProto))
                            * (doubleWidth - CityBlockDistance(&protoPoints[iProto], &inputPoint));
#ifdef PRC_DEBUG_CHECK_OVERFLOW
                        if (prevScore > localScore)
                            OS_Warning("Internal Error: score overflow\n");
                    }
#endif

                    iProto++;
                    ratio = FX_GetDivResult();
                    protoOrigNextRatio = protoNextRatio = ratio - protoPrevSumRatio;
                    protoPrevSumRatio = ratio;
                }
            }

            weight = FX_Div(inputLocalLength, inputStrokeLength);
            tmp = FX_Div(protoLocalLength, protoStrokeLength);
            if (weight < tmp)
            {
                weight = tmp;
            }
            weightedScore += FX_Mul(localScore / 256, weight);
            SDK_ASSERTMSG(weight != 0,
                          "inputStrokeLength: %d, inputLocalLength: %d, protoStrokeLength: %d, protoLocalLength: %d\n",
                          inputStrokeLength, inputLocalLength, protoStrokeLength, protoLocalLength);
            totalWeight += weight;
        }
        SDK_ASSERTMSG(totalWeight != 0, "nMatches: %d", nMatches);
        {
            fx32    ratio;
            ratio = (inputStrokeRatio >= protoStrokeRatio) ? inputStrokeRatio : protoStrokeRatio;
            *score = FX_Mul(weightedScore, ratio);
            *weight = FX_Mul(totalWeight, ratio);
        }
    }
}


/*---------------------------------------------------------------------------*
  End of file
 *---------------------------------------------------------------------------*/