PXL_Lookup.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:        PXL_Lookup.h ( PXL Library, C++)
 *
 * COMMENTS:
 *      Simple lookup table class.
 */
#ifndef PXL_LOOKUP_H
#define PXL_LOOKUP_H

#include "PXL_API.h"
#include "PXL_Common.h"
#include "PXL_OCIO.h"
#include <UT/UT_UniquePtr.h>
#include <SYS/SYS_Types.h>
#include <stdio.h>

class PXL_Raster;
class UT_FileLUT;

enum PXL_LookupType
{
    PXL_LOOKUP_R        = 0x001, // 1 table for Red only.
    PXL_LOOKUP_G        = 0x002,
    PXL_LOOKUP_B        = 0x004,
    PXL_LOOKUP_A        = 0x008, // 1 table for Alpha only.
    
    PXL_LOOKUP_RGB      = 0x017, // 3 tables, 1 each for Red, Green & Blue.
    PXL_LOOKUP_RGBA     = 0x01F, // 4 tables, 1 each for R, G, B and alpha.
    
    PXL_LOOKUP_COLOR    = 0x027, // 1 table for RGB.            
    PXL_LOOKUP_ALL      = 0x02F, // 1 table for all channels.

    PXL_LOOKUP_3D       = 0x040, // 3D LUT for color only.
    PXL_LOOKUP_3D_1D    = 0x060, // 3D LUT with 1D pre-pass, color only.
    PXL_LOOKUP_3D_HDR   = 0x140  // 3D LUT with log sampling
};

// Masks for PXL_LookupType
#define PXL_LOOKUP_1D                   0x3F
#define PXL_SEPARATE_CHANNELS           0x10
#define PXL_SINGLE_CHANNEL              0x20
#define PXL_ILLEGAL_MATCH               0x30
#define PXL_LOG_SAMPLE                  0x100


class CL_Clip;


class PXL_API PXL_Lookup
{
public:
                         PXL_Lookup();
                        ~PXL_Lookup();
                        
    static struct       BuildGammaTag {}        BuildGamma;
    static struct       BuildSRGBTag {}         BuildSRGB;
    static struct       BuildRec709Tag {}       BuildRec709;
    static struct       BuildOCIOTag {}         BuildOCIO;

                        enum Dir
                        {
                            LINEAR_TO_GAMMA,
                            GAMMA_TO_LINEAR
                        };

                        PXL_Lookup(BuildGammaTag,
                                   fpreal gamma,
                                   PXL_Lookup::Dir dir = LINEAR_TO_GAMMA,
                                   int lutsize = 1024);

                        PXL_Lookup(BuildSRGBTag,
                                   PXL_Lookup::Dir dir = LINEAR_TO_GAMMA,
                                   int lutsize = 1024);

                        PXL_Lookup(BuildRec709Tag,
                                   PXL_Lookup::Dir dir = LINEAR_TO_GAMMA,
                                   int lutsize = 1024);

                        PXL_Lookup(BuildOCIOTag,
                                   const char *src_color_space,
                                   const char *dest_color_space);

                        PXL_Lookup(const PXL_Lookup &) = delete;
    PXL_Lookup &        operator=(const PXL_Lookup &) = delete;

    int64               getMemoryUsage(bool inclusive) const;

    void                reset();

    // common LUT applications

    // single color modification
    void                evalLUT(float color[3]) const;

    // set a 1D LUT.
    void                setLUT(const CL_Clip &clip);

    // set the 3D LUT.
    void                set3DLUT(int size, float *lut);

    // applies the LUT to a raster (along with gamma). black/white are the
    // BW points of the image in the raster. 'comp' is used to convert the
    // raster to show only 1 component (ie, r->rgb).
    void                applyLUT(PXL_Raster &r, float gamma = 1.0f,
                                 float black=0.0f, float white=1.0f,
                                 int comp = -1) const;

    // returns the value for sampling at integer LUT index 'i'. If the
    // value is passed to evalLUT(), it will return the sample at table index i.
    // For 3D LUTs, this needs to be called once for each axis. 
    fpreal              indexToValue(int i) const;
    
    // --------------------------------------------------------------------
    // accessers

    bool                isValid() const;
    
    // 1D accessers
    PXL_LookupType      getType() const;
    bool                getLogSampling() const;
    float               getLogBias()     const;
    int                 getNumChannels() const;
    int                 getTableSize()   const;
    float               getBlackPoint()  const;
    float               getWhitePoint()  const;
    void                getDomain(float &s, float &e) const;
    void                getRange(float &s, float &e) const;
    float               getPreShift() const { return myPreShift; }

    bool                hasSpecificFormat(PXL_DataFormat &format) const;
    bool                hasLUTfor(PXL_LookupType type) const;

    void                setType(PXL_LookupType type);
    void                setLogSampling(bool log);
    void                setLogBias(float bias);
    void                setSpecificFormat(PXL_DataFormat format);
    void                setNumChannels(int num);
    void                setTableSize(int size);
    void                setBlackWhitePoints(float b, float w);
    void                setDomain(float s,float e);
    void                setRange(float s, float e);
    void                invert(int newsize = 0);

    bool                isHalfPrec() const { return myHalfPrecFlag; }

    // 3D accessers
    bool                is3DLUT() const { return myCubeSize != 0; }
    int                  get3DSize() const { return myCubeSize; }

    // --------------------------------------------------------------------
    // 1D LUT evaluation routines 
    fpreal              *getRawLUT(PXL_LookupType type);
    const fpreal        *getRawLUT(PXL_LookupType type) const;
    
    bool                 evalLUT(PXL_LookupType,
                                 int nsamples,
                                 float *data,
                                 unsigned b = 0,
                                 unsigned w = 0) const;
    
    bool                 evalLUT(PXL_LookupType,
                                 int nsamples,
                                 float *data,
                                 float black, float white,
                                 float from = 0.0f, float to = 1.0f) const;
    float                evalLUT(PXL_LookupType, float pos) const;

    void                 eval1DLUT(float color[3]) const;
    void                 get1DLUT(float *lut[4], int size, float b, float w,
                                  float sc, float sh, float gamma) const;

    void                 apply1DLUT(PXL_Raster &raster,
                                    float gamma = 1.0f,
                                    float black = 0.0f,
                                    float white = 1.0f,
                                    int comp = -1) const;
    // ---------------------------------------------------------------------
    // 3D LUT evaluation routines 
    void                 eval3DLUT(float color[3]) const;

    // makes a copy of the 3D LUT. 'lut' must be of size get3DSize()^3 * 3 if
    // type is a 3D linear or log LUT. If 3D with prelut is used, prelut must
    // non-NULL and of size get3DSize()^2.
    void                 copy3DLUT(float *lut, float *prelut = 0) const;
    void                 copy3DLUT(fpreal16 *lut, fpreal16 *prelut = 0) const;
    
    // clamps the 3D LUT to 0,1. Used for display LUTs.
    void                 clamp3DLUT();
    
    void                 apply3DLUT(PXL_Raster &r, float gamma = 1.0f,
                                    float black = 0.0f, float white = 1.0f,
                                    int component = -1) const;

    
    // File I/O.
    bool                load(const char *filename, bool header_only = false);
    bool                save(const char *filename, bool half_prec=false) const;

    // these load and save methods do not close fp.
    bool                load(FILE *fp, bool header_only);
    bool                loadBinary(FILE *fp, bool header_only);
    bool                save(FILE *fp) const;
    bool                saveBinary(FILE *fp, bool half_prec = false) const;

    
    bool                buildGamma(fpreal gamma,
                                   PXL_Lookup::Dir dir = LINEAR_TO_GAMMA,
                                   int lutsize = 1024);
    
    bool                buildSRGB(PXL_Lookup::Dir dir = LINEAR_TO_GAMMA,
                                  int lutsize = 1024);
    
    bool                buildREC709(PXL_Lookup::Dir dir = LINEAR_TO_GAMMA,
                                    int lutsize = 1024);

    /// Transform from an OpenColorIO colorspace to a View, specified by a
    /// display/view pair.
    /// Always use this method to build a LUT to or from a view; do not attempt
    /// to roll your own using colorspaces and view transforms as it is not
    /// straighforward.
    bool                buildOpenColorIOView(const char *src_color_space,
                                             const char *display_name,
                                             const char *view_name,
                                             const char *baked_display= nullptr,
                                             const char *baked_view = nullptr,
                                             bool inverse = false);

    /// Transform from one colorspace to another. 
    bool                buildOpenColorIO(const char *src_color_space,
                                         const char *dest_color_space);

    // creates a cineon LUT for our Cineon lib. This allocates a new LUT,
    // which should be freed with delete. Filename is only for comparing
    // UT_FileLUTs, it is optional.
    UT_UniquePtr<UT_FileLUT>
                        getCineonLUT(bool forward,
                                     const char *filename = 0) const;

    // Merge 2 LUTs into one LUT (this LUT). This has the same effect as running
    // a pixel through 'first_lut', then 'second_lut', with some possible
    // precision loss if one is a large 1D LUT and the other is a 3D LUT.
    bool                 mergeLUTs(const PXL_Lookup &first_lut,
                                   const PXL_Lookup &second_lut);

    void                 setTextureID(void *id) { myTextureID = id; }
    void                *getTextureID() const;
    void                 clearTextureID();

    void                 setPreLutID(void *id) { myPreLutID = id; }
    void                *getPreLutID() const;
    
private:
    int                 getIndexFor(PXL_LookupType type) const;

    bool                correctLUT();

    inline void         lerpPreLUT(float &color, float prelut_scale,
                                   const fpreal *prelut, int prelut_last) const;

    void                save1D(FILE *fp, bool bin, bool half = false) const;
    void                save3D(FILE *fp, bool bin, bool half = false) const;

    bool                fetchAllocationVars(const PXL_OCIO::ColorSpace *scs,
                                            const PXL_OCIO::ColorSpace *dcs,
                                            bool &uniform,
                                            fpreal &minv,
                                            fpreal &maxv,
                                            fpreal &offset);
    void                prep1DLUT(float *data, int size,
                                  bool uniform, fpreal minv, fpreal maxv);
    void                prep3DLUT(bool uniform, fpreal minv, fpreal maxv,
                                  fpreal offset);

    UT_UniquePtr<CL_Clip> myTable;
    PXL_LookupType      myType;
    PXL_DataFormat      myFormat;

    // 3D LUT
    UT_UniquePtr<float[]> myCubeLUT;
    int                 myCubeSize;
    
    float               myBlack;
    float               myWhite;
    float               myDomStart;
    float               myDomEnd;
    float               myRangeStart;
    float               myRangeEnd;
    float               myLogBias;
    float               myPreShift;
    void               *myTextureID;
    void               *myPreLutID;
    bool                myHalfPrecFlag;
};

#endif