cvfloodfill.cpp.svn-base

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#include "_cv.h"

typedef struct CvFFillSegment
{
    ushort y;
    ushort l;
    ushort r;
    ushort prevl;
    ushort prevr;
    short dir;
}
CvFFillSegment;

#define UP 1
#define DOWN -1             

#define ICV_PUSH( Y, L, R, PREV_L, PREV_R, DIR )\
{                                               \
    tail->y = (ushort)(Y);                      \
    tail->l = (ushort)(L);                      \
    tail->r = (ushort)(R);                      \
    tail->prevl = (ushort)(PREV_L);             \
    tail->prevr = (ushort)(PREV_R);             \
    tail->dir = (short)(DIR);                   \
    if( ++tail >= buffer_end )                  \
        tail = buffer;                          \
}


#define ICV_POP( Y, L, R, PREV_L, PREV_R, DIR ) \
{                                               \
    Y = head->y;                                \
    L = head->l;                                \
    R = head->r;                                \
    PREV_L = head->prevl;                       \
    PREV_R = head->prevr;                       \
    DIR = head->dir;                            \
    if( ++head >= buffer_end )                  \
        head = buffer;                          \
}


/****************************************************************************************\
*                             Simple (monochrome) Floodfill                              *
\****************************************************************************************/

static CvStatus
icvFloodFill_8u_C1IR( uchar* pImage, int step, CvSize roi, CvPoint seed,
                      uchar* _newVal, CvConnectedComp* region, int flags,
                      CvFFillSegment* buffer, int buffersize )
{
    uchar* img = pImage + step * seed.y;
    int i, L, R; 
    int area = 0;
    int val0 = 0;
    uchar newVal = _newVal[0];
    int XMin, XMax, YMin = seed.y, YMax = seed.y;
    int _8_connectivity = (flags & 255) == 8;
    CvFFillSegment* buffer_end = buffer + buffersize, *head = buffer, *tail = buffer;

    L = R = seed.x;
    val0 = img[L];

    if( val0 == newVal )
    {
        XMin = XMax = seed.x;
        goto exit_func;
    }

    img[L] = newVal;

    while( ++R < roi.width && img[R] == val0 )
        img[R] = newVal;

    while( --L >= 0 && img[L] == val0 )
        img[L] = newVal;

    XMax = --R;
    XMin = ++L;
    ICV_PUSH( seed.y, L, R, R + 1, R, UP );

    while( head != tail )
    {
        int k, YC, PL, PR, dir;
        ICV_POP( YC, L, R, PL, PR, dir );

        int data[][3] =
        {
            {-dir, L - _8_connectivity, R + _8_connectivity},
            {dir, L - _8_connectivity, PL - 1},
            {dir, PR + 1, R + _8_connectivity}
        };

        if( region )
        {
            area += R - L + 1;

            if( XMax < R ) XMax = R;
            if( XMin > L ) XMin = L;
            if( YMax < YC ) YMax = YC;
            if( YMin > YC ) YMin = YC;
        }

        for( k = (unsigned)(YC - dir) >= (unsigned)roi.height; k < 3; k++ )
        {
            dir = data[k][0];
            img = pImage + (YC + dir) * step;
            int left = data[k][1];
            int right = data[k][2];

            for( i = left; i <= right; i++ )
            {
                if( (unsigned)i < (unsigned)roi.width && img[i] == val0 )
                {
                    int j = i;
                    img[i] = newVal;
                    while( --j >= 0 && img[j] == val0 )
                        img[j] = newVal;

                    while( ++i < roi.width && img[i] == val0 )
                        img[i] = newVal;

                    ICV_PUSH( YC + dir, j+1, i-1, L, R, -dir );
                }
            }
        }
    }

exit_func:
    if( region )
    {
        region->area = area;
        region->rect.x = XMin;
        region->rect.y = YMin;
        region->rect.width = XMax - XMin + 1;
        region->rect.height = YMax - YMin + 1;
        region->value = newVal;
    }

    return CV_NO_ERR;
}


#define ICV_EQ_C3( p1, p2 ) \
    ((p1)[0] == (p2)[0] && (p1)[1] == (p2)[1] && (p1)[2] == (p2)[2])

#define ICV_SET_C3( p, q ) \
    ((p)[0] = (q)[0], (p)[1] = (q)[1], (p)[2] = (q)[2])

static CvStatus
icvFloodFill_8u_C3IR( uchar* pImage, int step, CvSize roi, CvPoint seed,
                      uchar* _newVal, CvConnectedComp* region, int flags,
                      CvFFillSegment* buffer, int buffersize )
{
    uchar* img = pImage + step * seed.y;
    int i, L, R; 
    int area = 0;
    int val0[3] = { 0, 0, 0 };
    uchar newVal[3] = { _newVal[0], _newVal[1], _newVal[2] };
    int XMin, XMax, YMin = seed.y, YMax = seed.y;
    int _8_connectivity = (flags & 255) == 8;
    CvFFillSegment* buffer_end = buffer + buffersize, *head = buffer, *tail = buffer;

    L = R = seed.x;
    ICV_SET_C3( val0, img + L*3 );

    if( ICV_EQ_C3( val0, newVal ))
    {
        XMin = XMax = seed.x;
        goto exit_func;
    }

    ICV_SET_C3( img + L*3, newVal );
    
    while( --L >= 0 && ICV_EQ_C3( img + L*3, val0 ))
        ICV_SET_C3( img + L*3, newVal );
    
    while( ++R < roi.width && ICV_EQ_C3( img + R*3, val0 ))
        ICV_SET_C3( img + R*3, newVal );

    XMin = ++L;
    XMax = --R;
    ICV_PUSH( seed.y, L, R, R + 1, R, UP );

    while( head != tail )
    {
        int k, YC, PL, PR, dir;
        ICV_POP( YC, L, R, PL, PR, dir );

        int data[][3] =
        {
            {-dir, L - _8_connectivity, R + _8_connectivity},
            {dir, L - _8_connectivity, PL - 1},
            {dir, PR + 1, R + _8_connectivity}
        };

        if( region )
        {
            area += R - L + 1;

            if( XMax < R ) XMax = R;
            if( XMin > L ) XMin = L;
            if( YMax < YC ) YMax = YC;
            if( YMin > YC ) YMin = YC;
        }

        for( k = (unsigned)(YC - dir) >= (unsigned)roi.height; k < 3; k++ )
        {
            dir = data[k][0];
            img = pImage + (YC + dir) * step;
            int left = data[k][1];
            int right = data[k][2];

            for( i = left; i <= right; i++ )
            {
                if( (unsigned)i < (unsigned)roi.width && ICV_EQ_C3( img + i*3, val0 ))
                {
                    int j = i;
                    ICV_SET_C3( img + i*3, newVal );
                    while( --j >= 0 && ICV_EQ_C3( img + j*3, val0 ))
                        ICV_SET_C3( img + j*3, newVal );

                    while( ++i < roi.width && ICV_EQ_C3( img + i*3, val0 ))
                        ICV_SET_C3( img + i*3, newVal );

                    ICV_PUSH( YC + dir, j+1, i-1, L, R, -dir );
                }
            }
        }
    }

exit_func:
    if( region )
    {
        region->area = area;
        region->rect.x = XMin;
        region->rect.y = YMin;
        region->rect.width = XMax - XMin + 1;
        region->rect.height = YMax - YMin + 1;
        region->value = CV_RGB( newVal[2], newVal[1], newVal[0] );
    }

    return CV_NO_ERR;
}


/* because all the operations on floats that are done during non-gradient floodfill
   are just copying and comparison on equality,
   we can do the whole op on 32-bit integers instead */
static CvStatus
icvFloodFill_32f_C1IR( int* pImage, int step, CvSize roi, CvPoint seed,
                       int* _newVal, CvConnectedComp* region, int flags,
                       CvFFillSegment* buffer, int buffersize )
{
    int* img = pImage + (step /= sizeof(pImage[0])) * seed.y;
    int i, L, R; 
    int area = 0;
    int val0 = 0;
    int newVal = _newVal[0];
    int XMin, XMax, YMin = seed.y, YMax = seed.y;
    int _8_connectivity = (flags & 255) == 8;
    CvFFillSegment* buffer_end = buffer + buffersize, *head = buffer, *tail = buffer;

    L = R = seed.x;
    val0 = img[L];

    if( val0 == newVal )
    {
        XMin = XMax = seed.x;
        goto exit_func;
    }

    img[L] = newVal;

    while( ++R < roi.width && img[R] == val0 )
        img[R] = newVal;

    while( --L >= 0 && img[L] == val0 )
        img[L] = newVal;

    XMax = --R;
    XMin = ++L;
    ICV_PUSH( seed.y, L, R, R + 1, R, UP );

    while( head != tail )
    {
        int k, YC, PL, PR, dir;
        ICV_POP( YC, L, R, PL, PR, dir );

        int data[][3] =
        {
            {-dir, L - _8_connectivity, R + _8_connectivity},
            {dir, L - _8_connectivity, PL - 1},
            {dir, PR + 1, R + _8_connectivity}
        };

        if( region )
        {
            area += R - L + 1;

            if( XMax < R ) XMax = R;
            if( XMin > L ) XMin = L;
            if( YMax < YC ) YMax = YC;
            if( YMin > YC ) YMin = YC;
        }

        for( k = (unsigned)(YC - dir) >= (unsigned)roi.height; k < 3; k++ )
        {
            dir = data[k][0];
            img = pImage + (YC + dir) * step;
            int left = data[k][1];
            int right = data[k][2];

            for( i = left; i <= right; i++ )
            {
                if( (unsigned)i < (unsigned)roi.width && img[i] == val0 )
                {
                    int j = i;
                    img[i] = newVal;
                    while( --j >= 0 && img[j] == val0 )
                        img[j] = newVal;

                    while( ++i < roi.width && img[i] == val0 )
                        img[i] = newVal;

                    ICV_PUSH( YC + dir, j+1, i-1, L, R, -dir );
                }
            }
        }
    }

exit_func:
    if( region )
    {
        region->area = area;
        region->rect.x = XMin;
        region->rect.y = YMin;
        region->rect.width = XMax - XMin + 1;
        region->rect.height = YMax - YMin + 1;