llimagej2c.h

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#ifndef LL_LLIMAGEJ2C_H
#define LL_LLIMAGEJ2C_H

#include "llimage.h"
#include "llassettype.h"

class LLImageJ2CImpl;
class LLImageJ2C : public LLImageFormatted
{
protected:
        virtual ~LLImageJ2C();

public:
        LLImageJ2C();

        // Base class overrides
        /*virtual*/ BOOL updateData();
        /*virtual*/ BOOL decode(LLImageRaw *raw_imagep, F32 decode_time=0.0);
        /*virtual*/ BOOL decode(LLImageRaw *raw_imagep, F32 decode_time, S32 first_channel, S32 max_channel_count);
        /*virtual*/ BOOL encode(const LLImageRaw *raw_imagep, F32 encode_time=0.0);
        /*virtual*/ S32 calcHeaderSize();
        /*virtual*/ S32 calcDataSize(S32 discard_level = 0);
        /*virtual*/ S32 calcDiscardLevelBytes(S32 bytes);
        /*virtual*/ S8  getRawDiscardLevel();
        
        // Encode with comment text 
        BOOL encode(const LLImageRaw *raw_imagep, const char* comment_text, F32 encode_time=0.0);

        BOOL validate(U8 *data, U32 file_size);
        BOOL loadAndValidate(const LLString &filename);

        // Encode accessors
        void setReversible(const BOOL reversible); // Use non-lossy?
        void setRate(F32 rate);
        void setMaxBytes(S32 max_bytes);
        S32 getMaxBytes() const { return mMaxBytes; }

        static S32 calcHeaderSizeJ2C();
        static S32 calcDataSizeJ2C(S32 w, S32 h, S32 comp, S32 discard_level, F32 rate = 0.f);

        static void openDSO();
        static void closeDSO();
        static std::string getEngineInfo();
        
protected:
        friend class LLImageJ2CImpl;
        friend class LLImageJ2COJ;
        friend class LLImageJ2CKDU;
        void decodeFailed();
        void updateRawDiscardLevel();

        S32 mMaxBytes; // Maximum number of bytes of data to use...
        S8  mRawDiscardLevel;
        F32 mRate;
        BOOL mReversible;
        LLImageJ2CImpl *mImpl;
};

// Derive from this class to implement JPEG2000 decoding
class LLImageJ2CImpl
{
public:
        virtual ~LLImageJ2CImpl();
protected:
        // Find out the image size and number of channels.
        // Return value:
        // true: image size and number of channels was determined
        // false: error on decode
        virtual BOOL getMetadata(LLImageJ2C &base) = 0;
        // Decode the raw image optionally aborting (to continue later) after
        // decode_time seconds.  Decode at most max_channel_count and start
        // decoding channel first_channel.
        // Return value:
        // true: decoding complete (even if it failed)
        // false: time expired while decoding
        virtual BOOL decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decode_time, S32 first_channel, S32 max_channel_count) = 0;
        virtual BOOL encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, const char* comment_text, F32 encode_time=0.0,
                                                        BOOL reversible=FALSE) = 0;

        friend class LLImageJ2C;
};

#define LINDEN_J2C_COMMENT_PREFIX "LL_"

#endif

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