//===============================================================================
// Copyright (c) 2014-2024  Advanced Micro Devices, Inc. All rights reserved.
//===============================================================================
//
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// furnished to do so, subject to the following conditions :
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// The above copyright notice and this permission notice shall be included in
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// THE SOFTWARE.
//
// BC6H_utils.h Genenral functions and definitions for use in encoder and decoder
// Revision
// 0.1    First implementation
//////////////////////////////////////////////////////////////////////////////////

#ifndef _BC6H_UTILS_H_
#define _BC6H_UTILS_H_

#include "bc6h_definitions.h"
#include <bitset>
#include <stddef.h>

class BitHeader
{
public:
    BitHeader(BYTE in[], int sizeinbytes)
    {
        m_bits.reset();
        m_sizeinbytes = sizeinbytes;

        if ((in != NULL) && (sizeinbytes <= 16))
        {
            // Init bits set with given data
            int bitpos = 0;
            for (int i = 0; i < sizeinbytes; i++)
            {
                int bit = 1;
                for (int j = 0; j < 8; j++)
                {
                    m_bits[bitpos] = in[i] & bit ? 1 : 0;
                    bit            = bit << 1;
                    bitpos++;
                }
            }
        }
    }

    ~BitHeader()
    {
    }

    void transferbits(BYTE in[], int sizeinbytes)
    {
        if ((sizeinbytes <= m_sizeinbytes) && (in != NULL))
        {
            // Init bits set with given data
            memset(in, 0, sizeinbytes);
            int bitpos = 0;
            for (int i = 0; i < sizeinbytes; i++)
            {
                int bit = 1;
                for (int j = 0; j < 8; j++)
                {
                    if (m_bits[bitpos])
                        in[i] |= bit;
                    bit = bit << 1;
                    bitpos++;
                }
            }
        }
    }

    int getvalue(int start, int bitsize)
    {
        int value = 0;
        int end   = start + bitsize - 1;
        for (; end >= start; end--)
        {
            value |= m_bits[end] ? 1 : 0;
            if (end > start)
                value <<= 1;
        }

        return value;
    }

    void setvalue(int start, int bitsize, int value, int maskshift = 0)
    {
        int end  = start + bitsize - 1;
        int mask = 0x1 << maskshift;
        for (; start <= end; start++)
        {
            m_bits[start] = (value & mask) ? 1 : 0;
            mask <<= 1;
        }
    }

    std::bitset<128> m_bits;  // 16 bytes max
    int              m_sizeinbytes;
};

extern void ViewData(unsigned char data[]);

extern void BC6H_WriteBit(BYTE* base, int offset, BYTE bitVal);

extern void BC6H_GetRamp(DWORD  endpoint[][MAX_DIMENSION_BIG],
                         double ramp[MAX_DIMENSION_BIG][(1 << BC6H_MAX_INDEX_BITS)],
                         DWORD  clusters[2],
                         DWORD  componentBits[MAX_DIMENSION_BIG]);

extern const double BC6H_rampLerpWeights[5][1 << MAX_INDEX_BITS];

#endif
