OgreDDSCodec.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2013 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __OgreDDSCodec_H__
#define __OgreDDSCodec_H__

#include "OgreImageCodec.h"
namespace Ogre {
    // Forward declarations
    struct DXTColourBlock;
    struct DXTExplicitAlphaBlock;
    struct DXTInterpolatedAlphaBlock;

    class _OgreExport DDSCodec : public ImageCodec
    {
    private:
        String mType;

        void flipEndian(void * pData, size_t size, size_t count) const;
        void flipEndian(void * pData, size_t size) const;

        PixelFormat convertFourCCFormat(uint32 fourcc) const;
        PixelFormat convertDXToOgreFormat(uint32 fourcc) const;
        PixelFormat convertPixelFormat(uint32 rgbBits, uint32 rMask,
            uint32 gMask, uint32 bMask, uint32 aMask) const;

        void unpackDXTColour(PixelFormat pf, const DXTColourBlock& block, ColourValue* pCol) const;
        void unpackDXTAlpha(const DXTExplicitAlphaBlock& block, ColourValue* pCol) const;
        void unpackDXTAlpha(const DXTInterpolatedAlphaBlock& block, ColourValue* pCol) const;

        static DDSCodec* msInstance;
    public:
        DDSCodec();
        virtual ~DDSCodec() { }

        DataStreamPtr encode(MemoryDataStreamPtr& input, CodecDataPtr& pData) const;
        void encodeToFile(MemoryDataStreamPtr& input, const String& outFileName, CodecDataPtr& pData) const;
        DecodeResult decode(DataStreamPtr& input) const;
        String magicNumberToFileExt(const char *magicNumberPtr, size_t maxbytes) const;
        
        virtual String getType() const;        

        static void startup(void);
        static void shutdown(void);

    };
} // namespace

#endif