TIL_Tile.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        TIL_Tile.h      (Tile Image Library, C++)
 *
 * COMMENTS:
 *      Defines the structure of an image tile.
 */
#ifndef TIL_TILE_H
#define TIL_TILE_H

#include "TIL_API.h"
#include "TIL_Defines.h"
#include "TIL_HoldingQueue.h"
#include <SYS/SYS_Types.h>

#include <iosfwd>


class UT_TokenString;
class TIL_TileCache;

class TIL_API TIL_Tile : public TIL_HoldingNode
{
public:
    // Constructor and Destructor are private; only TIL_CacheManager can create
    // and destroy tiles.
    
    // resets all the information for re-allocation.
    void                reset();

    // utility functions ****
    void                clear(float value = 0.0F, int scanstep=1,
                              int scanoff =0);
    // odd means double the odd scanlines to the even ones.
    void                lineDouble(bool odd);
    
    int                 matches(const UT_TokenString *image_id,
                                int tilex, int tiley) const;
    // like strcmp.
    int                 compare(const UT_TokenString *image_id,
                                int tilex, int tiley) const;
   

    // Accesser functions *****
    
    // plane name and vector index (0-3).
    void                setVectorName(const char *name, int vector =0);
    const char *        getVectorName() const           {return myVectorName;}
    void                setCompName(const char *name);
    const char *        getCompName() const             { return myCompName; }
    int                 getVectorIndex() const          {return myVectorIndex;}

    // format of the tile (int8,int16,int32,float32)
    void                setFormat(TIL_DataFormat f);
    TIL_DataFormat      getFormat() const               { return myFormat; }

    // storage type of this type (locked, proxy, nocache, cached). 
    void                setStorage(TIL_Storage storage) { myStorage = storage;}
    TIL_Storage         getStorage() const              { return myStorage; }

    // the "frame" number; first image is always 0 regardless of time offset.
    void                setImageNum(int n)              { myImageNum = n; }
    int                 getImageNum() const             { return myImageNum; }

    // black/white support for integer formats.
    void                setBlackWhitePoints(int black,int white);
    int                 usesBlackWhitePoints() const;
    void                getBlackWhitePoints(unsigned int &black,
                                            unsigned int &white) const
                        { black = myBlackLevel;  white = myWhiteLevel; }

    // tile offset in the main image (in pixels).
    void                setOffset(int x,int y) { myXOffset=x; myYOffset=y; }
    void                getOffset(int &x, int &y) const
                                { x=myXOffset; y=myYOffset; }

    // the size of the tile (from 1 to theTileX/YSize)
    void                setSize(int x, int y);
    void                getSize(int &x, int &y) const
                                { x = myXSize; y = myYSize; }

    int                 getNumPixels() const;

    // the COP this tile belongs to (void * due to lib linking). 
    void                setParent(void *parent)         { myParent = parent; }
    void *              getParent() const               { return myParent; }


    // the full path of the COP this tile belongs to.
    void                setNodePath(const char *path);
    const char *        getNodePath() const { return myNodePath;}

    // the image id; guarenteed to be unique if the tiles are different. 
    void                  setImageIdentifier(UT_TokenString *token)
                                { myImageIdentifier = token; }
    const UT_TokenString *getImageIdentifier() const
                                { return myImageIdentifier; }

    // has this tile been cooked yet?
    void                setCooked(bool done = true)     { myCookedFlag =done; }
    bool                isCooked() const                { return myCookedFlag;}

    bool                isCheckpoint() const  { return myCheckpointCount != 0; }
    int                 getCheckpointCount() const { return myCheckpointCount; }
    void                incrementCheckpointCount();
    void                decrementCheckpointCount();

    bool                determineIfConstant();
    bool                isConstantTile() const  { return myConstantTileFlag; }
    float               getConstantColor() const;
    
    // When flagging a tile as constant, ensure that you've already
    // initialized the data as this method will read it.
    void                setConstantTile(bool constant);
    
    // used to access this tile in a multithreaded environment
    // access can be TILE_LOCK_READ_ONLY or TILE_LOCK_WRITE
    int                 lock(int access, int block = 1);
    // used when cooking is done. score is the priority score for the tile.
    void                lockWriteToRead(int score);
    void                unlock(int access);

    // if on, this tile is being held for proxy writing.
    void                setProxyHold(bool on)    { myProxyHoldFlag = on; }
    
    // the amount of memory the tile's image takes up (not including overhead).
    int                 getMemSize() const              { return myMemSize; }

    // the amount of memory the tile takes up (including overhead)
    int64               getMemoryUsage(bool inclusive) const;
    
    // Image data accessor functions; returns NULL if the data type doesn't
    // match the function called. the void * functions always return non-null.
    void                setImageData(TIL_AlignedBlock * data)
                                        { myImageData = data; }
    
    void                getImageData(const unsigned char  *&data) const;
    void                getImageData(const unsigned short *&data) const;
    void                getImageData(const unsigned int   *&data) const;
    void                getImageData(const float          *&data) const;
    void                getImageData(const fpreal16       *&data) const;
    const void *        getImageData() const    { return (void *) *myImageData; }
    
    void                getImageData(unsigned char  *&data);
    void                getImageData(unsigned short *&data);
    void                getImageData(unsigned int   *&data);
    void                getImageData(float          *&data);
    void                getImageData(fpreal16       *&data);
    void *              getImageData()          { return (void *) *myImageData; }

    TIL_AlignedBlock    *getImageBlock() { return myImageData; }
    
    // caching functions *****
    
    // the priority of this tile.
    void                setPriority(unsigned int p)     { myPriority = p; }
    int                 getPriority() const             { return myPriority; }

    // returns 1 if this tile is locked in any way
    int                 isCacheLocked() const;
    bool                isReadLocked() const;
    bool                isWriteLocked() const;

    bool                isBorrowedImage() const { return myBorrowedImageFlag; }
    void                setBorrowedImage(bool b) { myBorrowedImageFlag = b;
                                                   myMemSize = 0; }

    // Static tile functions. 
    
    // selects a new tile size. Must be called before the Cache Manager is
    // initialized (or re-initialized). Use with extreme care.
    static void         setNewTileSize(int xsize, int ysize);

    // query tiles sizes and memory requirements.
    static int          getTileSizeX();
    static int          getTileSizeY();
    static int          getTile8Mem();
    static int          getTile16Mem();
    static int          getTile32Mem();

    static void         setTileCachePtr(TIL_TileCache *tc);

    // DEBUG
    void                print(std::ostream &os) const;
    static void         setCop2PrintCallback(void(*callback)(void *,std::ostream &));

private:
    // Only the Tile Cache can create and destroy tiles.
    TIL_Tile();
   ~TIL_Tile();

    // TIL_HoldingNode (12)
    // identification (16)
    const char          *myVectorName;
    const char          *myCompName;
    int                 myVectorIndex;
    int                 myImageNum;

    // description (40)
    TIL_DataFormat      myFormat;
    unsigned int        myBlackLevel;
    unsigned int        myWhiteLevel;
    int                 myXSize;
    int                 myYSize;
    int                 myXOffset;
    int                 myYOffset;
    int                 myMemSize;
    TIL_Storage         myStorage;
    char               *myNodePath;

    // caching (16)
    unsigned int        myPriority;
    void *              myParent;
    UT_TokenString *    myImageIdentifier;
    int                 myCheckpointCount;  // num planes checkpointing tile

    // flags (4)
    unsigned int        myCompNameAlloc         : 1,
                        myConstantTileFlag      : 1,
                        myBorrowedImageFlag     : 1,
                        myCookedFlag            : 1,
                        myProxyHoldFlag         : 1,
                        myVectorNameAlloc       : 1;

    // constant value, if const (4)
    union {
        unsigned char   myConstantVal8;
        unsigned short  myConstantVal16;
        unsigned int    myConstantVal32;
        float           myConstantValFP;
    };
    fpreal16    myConstantValFP16;

    // locking (24)
    TIL_FastLock                myMainLock;
    int                 myReadLocks;
    int                 myWriteLock;
    
    // actual image data: not owned by this object (4)
    TIL_AlignedBlock    *myImageData;

    friend class TIL_TileCache;
};


#endif // TIL_TILE_H