/**********************************************************************

Filename    :   GJPEGUtil.h
Content     :   JPEG image I/O utility classes
Created     :   June 24, 2005
Authors     :   

Notes       :   
History     :   

Copyright   :   (c) 1998-2006 Scaleform Corp. All Rights Reserved.

Licensees may use this file in accordance with the valid Scaleform
Commercial License Agreement provided with the software.

This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING 
THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR ANY PURPOSE.

**********************************************************************/

#ifndef INC_GJPEGUTIL_H
#define INC_GJPEGUTIL_H

#include "GTypes.h"
#include "GMemory.h"
#include "GRefCount.h"


// ***** Declared Classes
class GJPEGInput;
class GJPEGOutput;
class GFile;

class GJPEGSystem : public GRefCountBase<GJPEGSystem, GStat_Default_Mem>
{
public:
    static GJPEGSystem* GSTDCALL CreateDefaultSystem();

    virtual ~GJPEGSystem();
    virtual GJPEGInput* CreateInput(GFile* pin) = 0;
    virtual GJPEGInput* CreateSwfJpeg2HeaderOnly(GFile* pin) = 0;
    virtual GJPEGInput* CreateSwfJpeg2HeaderOnly(const UByte* pbuffer, UPInt bufSize) = 0;

    virtual GJPEGOutput* CreateOutput(GFile* pout, int width, int height, int quality) = 0;
    virtual GJPEGOutput* CreateOutput(GFile* pout) = 0;
};

class GJPEGInput : public GNewOverrideBase<GStat_Default_Mem>
{
public:

    virtual ~GJPEGInput();

    virtual void    DiscardPartialBuffer()  = 0;
    virtual int     StartImage()            = 0;
    virtual int     StartRawImage()         = 0;
    virtual int     FinishImage()           = 0;

    virtual UInt    GetHeight() const       = 0;
    virtual UInt    GetWidth() const        = 0;
    virtual int     ReadScanline(unsigned char* prgbData) = 0;
    virtual int     ReadRawData(void** pprawData) = 0;

    virtual void*   GetCInfo()              = 0; // returns jpeg_decompress_struct*

    virtual bool    IsErrorOccurred() const = 0;
};


// Helper object for writing jpeg image data.
class GJPEGOutput : public GNewOverrideBase<GStat_Default_Mem>
{
public:

    virtual ~GJPEGOutput();

    // ...
    virtual void    WriteScanline(unsigned char* prgbData)      = 0;
    virtual void    WriteRawData(const void* prawData)          = 0;
    virtual void    CopyCriticalParams(void* pSrcDecompressInfo)= 0;
    virtual void*   GetCInfo()           = 0;  // returns jpeg_compress_struct*
};


#endif // INC_GJPEGUTIL_H