//--------------------------------------------------------------------------------------
//CImageSurface
// Class for storing, manipulating, and copying image data to and from D3D Surfaces
//
//--------------------------------------------------------------------------------------
// (C) 2005 ATI Research, Inc., All rights reserved.
//--------------------------------------------------------------------------------------
// modifications by Crytek GmbH
// modifications by Amazon

#pragma once

#include <math.h>
#include <stdio.h>

#include "VectorMacros.h"


#ifndef WCHAR 
#define WCHAR wchar_t
#endif //WCHAR 

#ifndef SAFE_DELETE 
#define SAFE_DELETE(p)       { if(p) { delete (p);   (p)=NULL; } }
#endif

#ifndef SAFE_DELETE_ARRAY 
#define SAFE_DELETE_ARRAY(p) { if(p) { delete[] (p); (p)=NULL; } }
#endif


//Data types processed by cube map processor
// note that UNORM data types use the full range 
// of the unsigned integer to represent the range [0, 1] inclusive
// the float16 datatype is stored as D3Ds S10E5 representation
#define CP_VAL_UNORM8       0
#define CP_VAL_UNORM8_BGRA  1
#define CP_VAL_UNORM16     10
#define CP_VAL_FLOAT16     20 
#define CP_VAL_FLOAT32     30


// Type of data used internally by CSurfaceImage
#define CP_ITYPE float

namespace ImageProcessing
{
    //2D images used to store cube faces for processing, note that this class is 
    // meant to facilitate the copying of data to and from D3D surfaces hence the name ImageSurface
    class CImageSurface
    {
    public:
        int32 m_Width;          //image width
        int32 m_Height;         //image height
        int32 m_NumChannels;    //number of channels
        CP_ITYPE *m_ImgData;    //cubemap image data

    private:
        //fatal error
        void FatalError(const WCHAR *a_Msg);

    public:
        CImageSurface(void);
        void Clear(void);
        void Init(int32 a_Width, int32 a_Height, int32 a_NumChannels);

        //copy data from external buffer into this CImageSurface
        void SetImageData(int32 a_SrcType, int32 a_SrcNumChannels, int32 a_SrcPitch, void *a_SrcDataPtr);

        // copy image data from an external buffer and scale and degamma the data
        void SetImageDataClampDegammaScale(int32 a_SrcType, int32 a_SrcNumChannels, int32 a_SrcPitch, void *a_SrcDataPtr,
            float a_MaxClamp, float a_Degamma, float a_Scale);

        //copy data from this CImageSurface into an external buffer
        void GetImageData(int32 a_DstType, int32 a_DstNumChannels, int32 a_DstPitch, void *a_DstDataPtr);

        //copy image data from an external buffer and scale and gamma the data
        void GetImageDataScaleGamma(int32 a_DstType, int32 a_DstNumChannels, int32 a_DstPitch, void *a_DstDataPtr,
            float a_Scale, float a_Gamma);

        //clear one of the channels in the CSurfaceImage to a particular color
        void ClearChannelConst(int32 a_ChannelIdx, CP_ITYPE a_ClearColor);
        
        //various image operations that can be performed on the CImageSurface
        void InPlaceVerticalFlip(void);
        void InPlaceHorizonalFlip(void);
        void InPlaceDiagonalUVFlip(void);

        CP_ITYPE *GetSurfaceTexelPtr(int32 a_U, int32 a_V);
        ~CImageSurface();
    };

} // namespace ImageProcessing