imgmem.c.test

大师写的二代小波经典之作

/*
 * MEM_Init2D function: initialize memory for a 2D vector.
 */
Matrix
MEM_Init2D ( long width, long height )
{
    long   i, size_elem;
    void  *data;
    void  *dataPtr;
    void **ptr;
    unsigned int offsetData;

    size_elem = sizeof(Flt);
    offsetData = (sizeof(void *) * height);
    dataPtr = (void *)malloc( offsetData );
    data    = (void *)malloc( size_elem * height * width );
    if ( !data ) {
        return NULL;
    }
    ptr = (void **)dataPtr;

    for ( i=0 ; i<(int)height ; i++ ) {
        ptr[i] = (void *)(((long)data) + (i*(size_elem*width)));
    }

    return( (Matrix)dataPtr );
}


/*
 * MEM_Free2D function: frees a 2D vector.
 */
void
MEM_Free2D ( void *memarg )
{
    void **datamem = (void **)memarg;

    if ( memarg==NULL )
        return;

    free( datamem[0] );
    free( memarg );

    return;
}