doccolor.h

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// $Id: doccolor.h 1605 2006-07-29 19:26:03Z alex $
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 */
// doccolor.h - definitions for Camelot DocColour class


#ifndef INC_DOCCOLOR
#define INC_DOCCOLOR


#include "colmodel.h"
#include "stockcol.h"



// This is defined in colcontx.h, but we define it here to eliminate dependencies
#ifndef INC_COLCONTX
class ColourContext;
typedef UINT32 ColourContextHandle;
#endif


// these constants are used to set the Reserved flag in the Info struct when
// colours are converted for use in Brush Attributes. - DY 12/4/2000
const UINT32 COL_NAMED = 1;
const UINT32 COL_BLACK = 2;
const UINT32 COL_WHITE = 3;
const UINT32 COL_OVERRIDABLE = 4;

// DocColour Information struct
// Each DocColour contains this information on its contents
// Note:     The order of fields was chosen to encourage byte/word16 alignment
// See Also: IndexedColourInfo (in colourix.h)

typedef struct
{
    UINT32 OCContextHandle  : 16;   // Handle of context of the cached colour
    UINT32 SourceColourModel    : 4;    // The ColourModel of the source colour data
    UINT32 CacheColourModel : 4;    // The ColourModel of the cached colour data

    UINT32 IsSeparable      : 1;    // TRUE if this colour should be separated

    UINT32 ForceRounding        : 1;    // TRUE if this colour should always be shown rounded to half-percents
                                            // (A bodge for PANTONE colours!)
    UINT32 Reserved         : 5;

    UINT32 NoColour         : 1;    // 'None' Flag: Colour is 100% transparent
} ColourInfo;



/********************************************************************************************

>   class DocColour : public CC_CLASS_MEMDUMP

    Author:     Jason_Williams (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30/03/94
    Purpose:    This class defines a colour.
                A DocColour stores an original definition of a colour, a cache
                containing the definition of the colour in the last colour
                context in which it was used, and sundry information. DocColours
                have been designed to be small things to put in attributes.

                DocColours cannot be used on their own, however. They have meaning
                only within the scope of a given colour context.

                DocColours can be defined in any of the available colour models.

                DocColours are stored to "low" (32-bit) precision, except when they
                are references to IndexedColours (which are 128-bit precision).
                However, colour calculations, and access to values stored in
                colours are generally only available through the 128bit interface.

    Notes:      NOTE that any use of a DocColour may result in updating its cache,
                so you must NOT treat DocColours as const anywhere. Also, work on
                original DocColours rather than copies if you want the cache to
                be kept fresh on the original.

    SeeAlso:    IndexedColour; ColourModel; ColourContext
    Documentation:  HowToUse\colours.doc
            
********************************************************************************************/

class CCAPI DocColour : public CC_CLASS_MEMDUMP
{
friend class ColourContext;

CC_DECLARE_MEMDUMP(DocColour)

public:     // Construction/Destruction
    DocColour();
    ~DocColour();

    DocColour(StockColour Col);
            // Initialise with a non-separating stock colour. See kernel\stockcol.h

    DocColour(ColourModel ColModel, ColourGeneric *Col);
            // Initialise with a given colour definition

    DocColour(ColourValue Red, ColourValue Green, ColourValue Blue);
            // Initialise with RGB values (in the range 0.0-1.0)

    DocColour(const DocColour &other);
    DocColour& operator=(const DocColour&);
            // Copy constructor, assignment operator

public:     // Linking to IndexedColours
    void MakeRefToIndexedColour(IndexedColour *Other);
            // Link this DocColour to a given IndexedColour parent

    inline IndexedColour *FindParentIndexedColour(void);
            // Get a pointer (or NULL if none) to this colour's IndexedColour parent

#ifdef _DEBUG
            // Special function to provide extra tracing for Jason to detect where
            // "IndexedColour in use" problems originate. Only used in debug builds
#define MakeRefToIndexedColour(Bob) MakeRefToIndexedColourDBG(Bob, THIS_FILE, __LINE__)
#endif

    void MakeRefToIndexedColourDBG(IndexedColour *Other, LPCSTR TheFile = NULL, INT32 TheLine = 0);
            // Special debug version of MakeRefToIndexedColour

    IndexedColour *GetSpotParent(void);
            // Get the ultimate spot colour parent of this DocColour, if any


public:     // Comparison operators
    BOOL operator==(const DocColour) const;
    BOOL operator!=(const DocColour) const;


public:     // Interface
    ColourModel GetColourModel(void) const;
            // Get the colour model in which this colour is defined

    void GetSourceColour(ColourGeneric *Result);
            // Read the original colour definition in the GetColourModel() colour model

    inline BOOL IsTransparent(void) const;
            // Returns TRUE if this is "no colour"

    inline BOOL IsSeparable(void) const;
    void SetSeparable(BOOL IsSeparable = TRUE);
            // Determine/set flag to enable/disable separation and colour correction

    void Mix(DocColour *BlendStart, DocColour *BlendEnd, double BlendFraction,
                ColourContext *BlendContext, BOOL BlendTheLongWay = FALSE,
                ColourContext *OutputContext = NULL);
            // Redefine this colour as a blend/mix of two other colours

    void ForceRounding(BOOL RoundingOn) { Info.ForceRounding = RoundingOn; };
    BOOL IsForcedToRound(void) { return(Info.ForceRounding); };
            // Bodge for PANTONE colours - When Rounding is in effect, GetSourceColour will round all
            // returned components to the nearest half percent, which corrects the errors introduced
            // by using 0..255 values to represent the 200 possible half-percent values PANTONE use.
            // DO NOT USE THESE FUNCTIONS unless you know what you're doing


    // new functions to access the reserved flag
    void SetReservedFlag(UINT32 Value);
    UINT32 GetReservedFlag();

    BOOL IsNamed();
    void HackColReplacerPreDestruct();

protected:      // Internal helper functions for RGB and HSV mixing
    void MixRGB(DocColour *BlendStart, DocColour *BlendEnd, double BlendFraction,
                ColourContext *BlendContext);
            // Redefine this colour as a blend/mix of two other colours

    void MixCMYK(DocColour *BlendStart, DocColour *BlendEnd, double BlendFraction,
                ColourContext *BlendContext);
            // Redefine this colour as a blend/mix of two other colours

    void MixHSV(DocColour *BlendStart, DocColour *BlendEnd, double BlendFraction,
                ColourContext *BlendContext, BOOL BlendTheLongWay = FALSE);
            // Redefine this colour as a blend/mix of two other colours

    void MixTint(IndexedColour *SpotParent, IndexedColour *StartTint,
                    IndexedColour *EndTint, double BlendFraction);
            // Does a linear interpolation for tints, generating new local IndexedColours
            // to represent the resulting tint/shade values. Must only be used sparingly,
            // to avoid making millions of new local colours


public:     // Debug helpers
    void GetDebugDetails(StringBase* Str);  // Appends details of self to Str
                                            // e.g. Str = "GradFill"
                                            // GetDebugDetails(&Str);
                                            // gives: "GradFill colour = (...)"


public:     // Old interface - do not use these calls any more!
    void SetRGBValue(INT32 Red, INT32 Green, INT32 Blue);
    void GetRGBValue(INT32* Red, INT32* Green, INT32* Blue);

    void SetCMYKValue(PColourCMYK *New); 
    void GetCMYKValue(PColourCMYK *Result);
    void GetCMYKValue(ColourContext* pContext, PColourCMYK *Result);

    void SetHSVValue(INT32 h, INT32 s, INT32 v);
    void GetHSVValue(INT32* h, INT32* s, INT32* v);

    DocColour(INT32 Red, INT32 Green, INT32 Blue);


protected:
    ColourInfo      Info;
    ColourPacked    SourceColour;
    ColourPacked    CachedColour;


protected:
    void InitialiseInfoField(ColourModel ColModel);

    // We need this because the ColourPacked entries are different sizes, and therefore incompletely
    // initialized when set up with a colour model smaller than the default. This causes issues on
    // retail builds because we later memcmp the entire structure to tell if colours are the same.
    void ZapSourceColour() {memset(&SourceColour, 0, sizeof(SourceColour)); memset(&CachedColour, 0, sizeof(CachedColour)); }
};




/********************************************************************************************

<   DOCCOLOUR_RGBT(col)
<   DOCCOLOUR_HSVT(col)
<   DOCCOLOUR_CMYK(col)
<   DOCCOLOUR_CIET(col)

    Comment:    These macros simplify construction of DocColour objects in
                given colour models. Use something like this:

                {

                    ColourRGBT TheDefinition;

                    DocColour  TheColour = DOCCOLOURRGBT(&TheDefinition);

                }

    Notes:      Note that these macros explicitly cast 'col' to a
                (ColourGeneric *), so if it is not a pointer to a 128-bit
                colour structure (ColourGeneric, ColourRGBT, ColourCIET etc)
                then nasty things may occur.

    SeeAlso:    DocColour::DocColour

********************************************************************************************/

#define DOCCOLOUR_RGBT(col) DocColour(COLOURMODEL_RGBT, (ColourGeneric *) col)
#define DOCCOLOUR_HSVT(col) DocColour(COLOURMODEL_HSVT, (ColourGeneric *) col)
#define DOCCOLOUR_CMYK(col) DocColour(COLOURMODEL_CMYK, (ColourGeneric *) col)
#define DOCCOLOUR_CIET(col) DocColour(COLOURMODEL_CIET, (ColourGeneric *) col)





/********************************************************************************************

>   inline BOOL DocColour::IsTransparent() const

    Author:     Jason_Williams (Xara Group Ltd) <camelotdev@xara.com>
    Created:    14/04/94
    Inputs:     -
    Outputs:    -
    Returns:    TRUE if the colour is "no colour" ("transparent").
    Purpose:    Determines if a colour's "no colour" flag is set
    SeeAlso:    -

********************************************************************************************/

inline BOOL DocColour::IsTransparent(void) const
{
    return(Info.NoColour);
}

/********************************************************************************************

>   inline BOOL DocColour::IsSeparable() const

    Author:     Jason_Williams (Xara Group Ltd) <camelotdev@xara.com>
    Created:    17/5/96

    Returns:    TRUE if the colour is allowed to be colour separated and/or corrected
                during colour conversions.

    Purpose:    Determines if a colour's "IsSeparable" flag is set
    SeeAlso:    DocColour::SetSeparable

********************************************************************************************/

inline BOOL DocColour::IsSeparable(void) const
{
    return(Info.IsSeparable);
}



/********************************************************************************************

>   inline IndexedColour *DocColour::FindParentIndexedColour(void);

    Author:     Jason_Williams (Xara Group Ltd) <camelotdev@xara.com>
    Created:    7/6/94
    Inputs:     -
    Outputs:    -
    Returns:    NULL if this is an immediate colour
                else a pointer to the IndexedColour which this DocColour references
    Purpose:    Determines if a colour references an IndexedColour, and if so, gives
                access to the parent colour.
    SeeAlso:    DocColour::MakeRefToIndexedColour

********************************************************************************************/

inline IndexedColour *DocColour::FindParentIndexedColour(void)
{
    if (Info.SourceColourModel != COLOURMODEL_INDEXED)
        return(NULL);

    return(SourceColour.Indexed.Colour);
}

#endif      // INC_DOCCOLOR

---