cxdatastructs.cpp

这个是基于在CCS开发环境下

    if( (unsigned)length > (unsigned)seq->total ||
        ((unsigned)slice.start_index >= (unsigned)seq->total && length != 0) )
        CV_ERROR( CV_StsOutOfRange, "Bad sequence slice" );

    CV_CALL( subseq = cvCreateSeq( seq->flags, seq->header_size, elem_size, storage ));

    if( length > 0 )
    {
        cvStartReadSeq( seq, &reader, 0 );
        cvSetSeqReaderPos( &reader, slice.start_index, 0 );
        count = (int)((reader.block_max - reader.ptr)/elem_size);

        do
        {
            int bl = MIN( count, length );
            
            if( !copy_data )
            {
                block = (CvSeqBlock*)cvMemStorageAlloc( storage, sizeof(*block) );
                if( !first_block )
                {
                    first_block = subseq->first = block->prev = block->next = block;
                    block->start_index = 0;
                }
                else
                {
                    block->prev = last_block;
                    block->next = first_block;
                    last_block->next = first_block->prev = block;
                    block->start_index = last_block->start_index + last_block->count;
                }
                last_block = block;
                block->data = reader.ptr;
                block->count = bl;
                subseq->total += bl;
            }
            else
                cvSeqPushMulti( subseq, reader.ptr, bl, 0 );
            length -= bl;
            reader.block = reader.block->next;
            reader.ptr = reader.block->data;
            count = reader.block->count;
        }
        while( length > 0 );
    }
    
    __END__;

    return subseq;
}


// Remove slice from the middle of the sequence
// !!! TODO !!! Implement more efficient algorithm
CV_IMPL void
cvSeqRemoveSlice( CvSeq* seq, CvSlice slice )
{
    CV_FUNCNAME("cvSeqRemoveSlice");

    __BEGIN__;

    int total, length;

    if( !CV_IS_SEQ(seq) )
        CV_ERROR( CV_StsBadArg, "Invalid sequence header" );

    length = cvSliceLength( slice, seq );
    total = seq->total;

    if( slice.start_index < 0 )
        slice.start_index += total;
    else if( slice.start_index >= total )
        slice.start_index -= total;

    if( (unsigned)slice.start_index >= (unsigned)total )
        CV_ERROR( CV_StsOutOfRange, "start slice index is out of range" );

    slice.end_index = slice.start_index + length;

    if( slice.end_index < total )
    {
        CvSeqReader reader_to, reader_from;
        int elem_size = seq->elem_size;

        cvStartReadSeq( seq, &reader_to );
        cvStartReadSeq( seq, &reader_from );

        if( slice.start_index > total - slice.end_index )
        {
            int i, count = seq->total - slice.end_index;
            cvSetSeqReaderPos( &reader_to, slice.start_index );
            cvSetSeqReaderPos( &reader_from, slice.end_index );

            for( i = 0; i < count; i++ )
            {
                CV_MEMCPY_AUTO( reader_to.ptr, reader_from.ptr, elem_size );
                CV_NEXT_SEQ_ELEM( elem_size, reader_to );
                CV_NEXT_SEQ_ELEM( elem_size, reader_from );
            }

            cvSeqPopMulti( seq, 0, slice.end_index - slice.start_index );
        }
        else
        {
            int i, count = slice.start_index;
            cvSetSeqReaderPos( &reader_to, slice.end_index );
            cvSetSeqReaderPos( &reader_from, slice.start_index );

            for( i = 0; i < count; i++ )
            {
                CV_PREV_SEQ_ELEM( elem_size, reader_to );
                CV_PREV_SEQ_ELEM( elem_size, reader_from );

                CV_MEMCPY_AUTO( reader_to.ptr, reader_from.ptr, elem_size );
            }

            cvSeqPopMulti( seq, 0, slice.end_index - slice.start_index, 1 );
        }
    }
    else
    {
        cvSeqPopMulti( seq, 0, total - slice.start_index );
        cvSeqPopMulti( seq, 0, slice.end_index - total, 1 );
    }

    __END__;
}


// Inserts a new sequence into the middle of another sequence
// !!! TODO !!! Implement more efficient algorithm
CV_IMPL void
cvSeqInsertSlice( CvSeq* seq, int index, const CvArr* from_arr )
{
    CvSeqReader reader_to, reader_from;
    int i, elem_size, total, from_total;
    
    CV_FUNCNAME("cvSeqInsertSlice");

    __BEGIN__;

    CvSeq from_header, *from = (CvSeq*)from_arr;
    CvSeqBlock block;

    if( !CV_IS_SEQ(seq) )
        CV_ERROR( CV_StsBadArg, "Invalid destination sequence header" );

    if( !CV_IS_SEQ(from))
    {
        CvMat* mat = (CvMat*)from;
        if( !CV_IS_MAT(mat))
            CV_ERROR( CV_StsBadArg, "Source is not a sequence nor matrix" );

        if( !CV_IS_MAT_CONT(mat->type) || (mat->rows != 1 && mat->cols != 1) )
            CV_ERROR( CV_StsBadArg, "The source array must be 1d coninuous vector" );

        CV_CALL( from = cvMakeSeqHeaderForArray( CV_SEQ_KIND_GENERIC, sizeof(from_header),
                                                 CV_ELEM_SIZE(mat->type),
                                                 mat->data.ptr, mat->cols + mat->rows - 1,
                                                 &from_header, &block ));
    }

    if( seq->elem_size != from->elem_size )
        CV_ERROR( CV_StsUnmatchedSizes,
        "Sizes of source and destination sequences' elements are different" );

    from_total = from->total;

    if( from_total == 0 )
        EXIT;

    total = seq->total;
    index += index < 0 ? total : 0;
    index -= index > total ? total : 0;

    if( (unsigned)index > (unsigned)total )
        CV_ERROR( CV_StsOutOfRange, "" );

    elem_size = seq->elem_size;

    if( index < (total >> 1) )
    {
        cvSeqPushMulti( seq, 0, from_total, 1 );

        cvStartReadSeq( seq, &reader_to );
        cvStartReadSeq( seq, &reader_from );
        cvSetSeqReaderPos( &reader_from, from_total );

        for( i = 0; i < index; i++ )
        {
            CV_MEMCPY_AUTO( reader_to.ptr, reader_from.ptr, elem_size );
            CV_NEXT_SEQ_ELEM( elem_size, reader_to );
            CV_NEXT_SEQ_ELEM( elem_size, reader_from );
        }
    }
    else
    {
        cvSeqPushMulti( seq, 0, from_total );

        cvStartReadSeq( seq, &reader_to );
        cvStartReadSeq( seq, &reader_from );
        cvSetSeqReaderPos( &reader_from, total );
        cvSetSeqReaderPos( &reader_to, seq->total );

        for( i = 0; i < total - index; i++ )
        {
            CV_PREV_SEQ_ELEM( elem_size, reader_to );
            CV_PREV_SEQ_ELEM( elem_size, reader_from );
            CV_MEMCPY_AUTO( reader_to.ptr, reader_from.ptr, elem_size );
        }
    }

    cvStartReadSeq( from, &reader_from );
    cvSetSeqReaderPos( &reader_to, index );

    for( i = 0; i < from_total; i++ )
    {
        CV_MEMCPY_AUTO( reader_to.ptr, reader_from.ptr, elem_size );
        CV_NEXT_SEQ_ELEM( elem_size, reader_to );
        CV_NEXT_SEQ_ELEM( elem_size, reader_from );
    }

    __END__;
}

// Sort the sequence using user-specified comparison function.
// The semantics is similar to qsort() function. The code is based
// on BSD system qsort():
//    * Copyright (c) 1992, 1993
//    *  The Regents of the University of California.  All rights reserved.
//    *
//    * Redistribution and use in source and binary forms, with or without
//    * modification, are permitted provided that the following conditions
//    * are met:
//    * 1. Redistributions of source code must retain the above copyright
//    *    notice, this list of conditions and the following disclaimer.
//    * 2. Redistributions in binary form must reproduce the above copyright
//    *    notice, this list of conditions and the following disclaimer in the
//    *    documentation and/or other materials provided with the distribution.
//    * 3. All advertising materials mentioning features or use of this software
//    *    must display the following acknowledgement:
//    *  This product includes software developed by the University of
//    *  California, Berkeley and its contributors.
//    * 4. Neither the name of the University nor the names of its contributors
//    *    may be used to endorse or promote products derived from this software
//    *    without specific prior written permission.
//    *
//    * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
//    * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//    * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
//    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
//    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
//    * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
//    * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
//    * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
//    * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
//    * SUCH DAMAGE.

typedef struct CvSeqReaderPos
{
    CvSeqBlock* block;
    char* ptr;
    char* block_min;
    char* block_max;
}
CvSeqReaderPos;

#define CV_SAVE_READER_POS( reader, pos )   \
{                                           \
    (pos).block = (reader).block;           \
    (pos).ptr = (reader).ptr;               \
    (pos).block_min = (reader).block_min;   \
    (pos).block_max = (reader).block_max;   \
}

#define CV_RESTORE_READER_POS( reader, pos )\
{                                           \
    (reader).block = (pos).block;           \
    (reader).ptr = (pos).ptr;               \
    (reader).block_min = (pos).block_min;   \
    (reader).block_max = (pos).block_max;   \
}

inline char*
icvMed3( char* a, char* b, char* c, CvCmpFunc cmp_func, void* aux )
{
    return cmp_func(a, b, aux) < 0 ?
      (cmp_func(b, c, aux) < 0 ? b : cmp_func(a, c, aux) < 0 ? c : a)
     :(cmp_func(b, c, aux) > 0 ? b : cmp_func(a, c, aux) < 0 ? a : c);
}

CV_IMPL void
cvSeqSort( CvSeq* seq, CvCmpFunc cmp_func, void* aux )
{         
    int elem_size;
    int isort_thresh = 7;
    CvSeqReader left, right;
    int sp = 0;

    struct
    {
        CvSeqReaderPos lb;
        CvSeqReaderPos ub;
    }
    stack[48];

    CV_FUNCNAME( "cvSeqSort" );

    __BEGIN__;
    
    if( !CV_IS_SEQ(seq) )
        CV_ERROR( !seq ? CV_StsNullPtr : CV_StsBadArg, "Bad input sequence" );

    if( !cmp_func )
        CV_ERROR( CV_StsNullPtr, "Null compare function" );

    if( seq->total <= 1 )
        EXIT;

    elem_size = seq->elem_size;
    isort_thresh *= elem_size;

    cvStartReadSeq( seq, &left, 0 );
    right = left;
    CV_SAVE_READER_POS( left, stack[0].lb );
    CV_PREV_SEQ_ELEM( elem_size, right );
    CV_SAVE_READER_POS( right, stack[0].ub );

    while( sp >= 0 )
    {
        CV_RESTORE_READER_POS( left, stack[sp].lb );
        CV_RESTORE_READER_POS( right, stack[sp].ub );
        sp--;

        for(;;)
        {
            int i, n, m;
            CvSeqReader ptr, ptr2;

            if( left.block == right.block )
                n = (int)(right.ptr - left.ptr) + elem_size;
            else
            {
                n = cvGetSeqReaderPos( &right );
                n = (n - cvGetSeqReaderPos( &left ) + 1)*elem_size;
            }

            if( n <= isort_thresh )
            {
            insert_sort:
                ptr = ptr2 = left;
                CV_NEXT_SEQ_ELEM( elem_size, ptr );
                CV_NEXT_SEQ_ELEM( elem_size, right );
                while( ptr.ptr != right.ptr )
                {
                    ptr2.ptr = ptr.ptr;
                    if( ptr2.block != ptr.block )
                    {
                        ptr2.block = ptr.block;
                        ptr2.block_min = ptr.block_min;
                        ptr2.block_max = ptr.block_max;
                    }
                    while( ptr2.ptr != left.ptr )
                    {
                        char* cur = ptr2.ptr;
                        CV_PREV_SEQ_ELEM( elem_size, ptr2 );
                        if( cmp_func( ptr2.ptr, cur, aux ) <= 0 )
                            break;
                        CV_SWAP_ELEMS( ptr2.ptr, cur, elem_size );
                    }
                    CV_NEXT_SEQ_ELEM( elem_size, ptr );
                }
                break;
            }
            else
            {
                CvSeqReader left0, left1, right0, right1;
                CvSeqReader tmp0, tmp1;
                char *m1, *m2, *m3, *pivot;
                int swap_cnt = 0;
                int l, l0, l1, r, r0, r1;

                left0 = tmp0 = left;
                right0 = right1 = right;
                n /= elem_size;
                
                if( n > 40 )
                {
                    int d = n / 8;
                    char *p1, *p2, *p3;
                    p1 = tmp0.ptr;
                    cvSetSeqReaderPos( &tmp0, d, 1 );
                    p2 = tmp0.ptr;
                    cvSetSeqReaderPos( &tmp0, d, 1 );
                    p3 = tmp0.ptr;
                    m1 = icvMed3( p1, p2, p3, cmp_func, aux );
                    cvSetSeqReaderPos( &tmp0, (n/2) - d*3, 1 );
                    p1 = tmp0.ptr;
                    cvSetSeqReaderPos( &tmp0, d, 1 );
                    p2 = tmp0.ptr;
                    cvSetSeqReaderPos( &tmp0, d, 1 );
                    p3 = tmp0.ptr;
                    m2 = icvMed3( p1, p2, p3, cmp_func, aux );
                    cvSetSeqReaderPos( &tmp0, n - 1 - d*3 - n/2, 1 );
                    p1 = tmp0.ptr;
                    cvSetSeqReaderPos( &tmp0, d, 1 );
                    p2 = tmp0.ptr;
                    cvSetSeqReaderPos( &tmp0, d, 1 );
                    p3 = tmp0.ptr;
                    m3 = icvMed3( p1, p2, p3, cmp_func, aux );
                }
                else
                {
                    m1 = tmp0.ptr;
                    cvSetSeqReaderPos( &tmp0, n/2, 1 );
                    m2 = tmp0.ptr;
                    cvSetSeqReaderPos( &tmp0, n - 1 - n/2, 1 );
                    m3 = tmp0.ptr;
                }

                pivot = icvMed3( m1, m2, m3, cmp_func, aux );
                left = left0;
                if( pivot != left.ptr )
                {
                    CV_SWAP_ELEMS( pivot, left.ptr, elem_size );
                    pivot = left.ptr;
                }
                CV_NEXT_SEQ_ELEM( elem_size, left );
                left1 = left;

                for(;;)
                {
                    while( left.ptr != right.ptr && (r = cmp_func(left.ptr, pivot, aux)) <= 0 )
                    {
                        if( r == 0 )
                        {
                            if( left1.ptr != left.ptr )
                                CV_SWAP_ELEMS( left1.ptr, left.ptr, elem_size );
                            swap_cnt = 1;
                            CV_NEXT_SEQ_ELEM( elem_size, left1 );
                        }
                        CV_NEXT_SEQ_ELEM( elem_size, left );
                    }

                    while( left.ptr != right.ptr && (r = cmp_func(right.ptr,pivot, aux)) >= 0 )
                    {
                        if( r == 0 )
                        {
                            if( right1.ptr != right.ptr )
                                CV_SWAP_ELEMS( right1.ptr, right.ptr, elem_size );
                            swap_cnt = 1;
                            CV_PREV_SEQ_ELEM( elem_size, right1 );
                        }
                        CV_PREV_SEQ_ELEM( elem_size, right );
                    }

                    if( left.ptr == right.ptr )
                    {
                        r = cmp_func(left.ptr, pivot, aux);
                        if( r == 0 )
                        {
                            if( left1.ptr != left.ptr )
                                CV_SWAP_ELEMS( left1.ptr, left.ptr, elem_size );