dcmjpls/libcharls/util.h

//
// (C) Jan de Vaan 2007-2010, all rights reserved. See the accompanying "License.txt" for licensed use.
//


#ifndef CHARLS_UTIL
#define CHARLS_UTIL

#include "pubtypes.h"

#ifndef MAX
#define MAX(a,b)            (((a) > (b)) ? (a) : (b))
#endif

#ifndef MIN
#define MIN(a,b)            (((a) < (b)) ? (a) : (b))
#endif

#ifndef ABS
#define ABS(a)              (((a) > 0) ? (a) : -(a))
#endif


const LONG BASIC_RESET  = 64;

inline LONG log_2(LONG n)
{
    LONG x = 0;
    while (n > (LONG(1) << x))
    {
        ++x;
    }
    return x;

}

struct Size
{
    Size(LONG width, LONG height) :
        cx(width),
        cy(height)
    {}
    LONG cx;
    LONG cy;
};



inline LONG Sign(LONG n)
    { return (n >> (LONG_BITCOUNT-1)) | 1;}

inline LONG BitWiseSign(LONG i)
    { return i >> (LONG_BITCOUNT-1); }


template<class SAMPLE>
struct Triplet
{
    Triplet() :
        v1(0),
        v2(0),
        v3(0)
    {}

    Triplet(LONG x1, LONG x2, LONG x3) :
        v1((SAMPLE)x1),
        v2((SAMPLE)x2),
        v3((SAMPLE)x3)
    {}

        union
        {
            SAMPLE v1;
            SAMPLE R;
        };
        union
        {
            SAMPLE v2;
            SAMPLE G;
        };
        union
        {
            SAMPLE v3;
            SAMPLE B;
        };
};

inline bool operator==(const Triplet<BYTE>& lhs, const Triplet<BYTE>& rhs)
    { return lhs.v1 == rhs.v1 && lhs.v2 == rhs.v2 && lhs.v3 == rhs.v3; }

inline bool  operator!=(const Triplet<BYTE>& lhs, const Triplet<BYTE>& rhs)
    { return !(lhs == rhs); }


template<class sample>
struct Quad : public Triplet<sample>
{
    Quad() :
        v4(0)
        {}

    Quad(Triplet<sample> triplet, LONG alpha) : Triplet<sample>(triplet), A((sample)alpha)
        {}

    union
    {
        sample v4;
        sample A;
    };
};



template<typename T>
struct FromBigEndian
{
    inlinehint static T Read(BYTE* pbyte)
    {
        T ret = pbyte[0];
        for (unsigned int i = 1; i < sizeof(T); i++)
        {
            ret <<= 8;
            ret |= pbyte[i];
        }
        return ret;
    }
};


class JlsException
{
public:
    JlsException(JLS_ERROR error) : _error(error)
        { }

    JLS_ERROR _error;
};


#endif

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