TIL_ImageCache.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_ImageCache.h (IMGUI library, C++)
 *
 * COMMENTS:
 *      Manages a cache of TIL_Raster images for viewing.
 */
#ifndef TIL_IMAGE_CACHE_H
#define TIL_IMAGE_CACHE_H

#include "TIL_API.h"
#include <iosfwd>

#include <UT/UT_Cache.h>
#include <UT/UT_FilterType.h>
#include <UT/UT_Options.h>

#include "TIL_Defines.h"

class UT_Options;

class TIL_Image;
class TIL_ImageState;
class TIL_Look;
class TIL_ImageSource;
class TIL_Raster;

enum TIL_AlphaOption {
    TIL_NO_ALPHA,
    TIL_USE_ALPHA,
    TIL_SOLID_ALPHA
};

struct TIL_GetImageOptions
{
    TIL_GetImageOptions() :
            myZoom(1), myIZoom(1),
            myU1(0), myV1(0), myU2(1), myV2(1),
            myScaled(false),
            myAlpha(TIL_NO_ALPHA),
            myOnlyIfCached(false),
            myOverrideRes(false),
            myOverX(-1), myOverY(-1),
            myDataFormat(TILE_MAX_DATA_FORMAT),
            myHalfFloatSupport(true),
            myUseAspectRatio(true),
            mySkipPostprocessor(false),
            myUTOptions()
    {}

    void                setCrop(float u1, float v1, float u2, float v2)
                        { myU1 = u1; myV1 = v1; myU2 = u2; myV2 = v2; }

    void                setResolution(exint resx, exint resy)
                        { myOverrideRes = true; myOverX = resx; myOverY = resy; }

    float               myZoom;
    float               myIZoom;
    float               myU1, myV1;
    float               myU2, myV2;

    /// Set to true if retrieving a raster at a different resolution
    /// and scaling it to return is okay.
    bool                myScaled;

    TIL_AlphaOption     myAlpha;
    bool                myOnlyIfCached;
    bool                myOverrideRes;
    exint               myOverX, myOverY;
    TIL_DataFormat      myDataFormat;
    bool                myHalfFloatSupport;
    bool                myUseAspectRatio;
    bool                mySkipPostprocessor;

    UT_Options myUTOptions;
};

class TIL_API TIL_ImageCache : public UT_Cache
{
public:
                         TIL_ImageCache();
                        ~TIL_ImageCache() override;

    void                 setCacheLimit(bool enable);
    void                 setCacheSize(unsigned size_in_kb);

    int64                getCurrentSize() const { return mySize; }
    int64                getMaxSize() const { return myMaxSize; }

    void                recalculateSize();

    static int64         getSystemMaxSize();

    void                 addToCache(TIL_Image *image);
    void                 returnToCache(TIL_Image *&image);
    void                 returnToCache(const TIL_Raster *r);
    bool                 isRasterInCache(const TIL_Raster *r) const;
    
    void                 removeSourceFromCache(TIL_ImageSource *source);
    void                 removeFrameFromCache(TIL_ImageSource *source, int fr);

    // the tokenstring, frame index and node path should be filled in.
    // returns 1 and fills in the raster if found (0 otherwise). 
    TIL_Image   *        getImageFromCache(TIL_ImageState *match,
                                           bool usedscaled = false,
                                           UT_FilterType f = UT_FILTER_BOX,
                                           bool bump = true);

    // Do not set force_all to true unless calling in a UT_Exit callback.
    void                 clearImageCache(bool force_all = false);

    int                  getImage(TIL_Image        *&image,
                                  TIL_ImageSource *source,
                                  const char        *plane,
                                  exint              planeindex,
                                  float              t,
                                  void              *look,
                                  bool               updateflag,
                                  const TIL_GetImageOptions &opts =
                                                      TIL_GetImageOptions());

    static void          setUpdateCallback(void (*callback)(void *,
                                                            TIL_Raster *,
                                                            int,int,
                                                            float,float));

    void                 dumpCache(std::ostream &os);
    
    int64                utReduceCacheSizeBy(int64 amount) override;
protected:
    // the UT_Cache interface
    const char          *utGetCacheName() const override
                            { return "Composite View Cache";}
    int64                utGetCurrentSize() const override
                            { return getCurrentSize(); }
    bool                 utHasMaxSize() const override
                            { return true; }
    int64                utGetMaxSize() const override
                            { return getMaxSize()*1024; }
    void                 utSetMaxSize(int64 size) override; 

private:
    int                  fetchImage(TIL_Image      *&image,
                                    TIL_ImageState *state,
                                    float           t,
                                    void           *look,
                                    bool            updateflag,
                                    bool            scaled,
                                    bool            include_alpha,
                                    bool            interactive,
                                    exint                   fxres,
                                    exint                   fyres,
                                    bool            onlyifcached,
                                    bool            use_software_emul,
                                    bool            halffloatsupport,
                                    bool            skip_postprocessor,
                                    const           UT_Options &);
    
    void                 removeReference(TIL_Image *&image);
    bool                 removeImage(TIL_Image *image);
    
    void                 pruneCache();

    void                 pruneAnyObsoleteImages();
    void                 unlinkImage(TIL_Image *image);

    void                 lockCache() const;
    void                 unlockCache() const;
    
    TIL_Image           *myHead;
    TIL_Image           *myTail;
    int64                mySize;
    int64                myMaxSize;
    exint                        myNumImages;
    exint                        myNumObsolete;
    unsigned             myCacheLimit : 1,
                         my8BitEmulOnly :1;
    mutable TIL_FastLock myLock;
};

TIL_API TIL_ImageCache *TILgetCache();

#endif