colplate.h

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// $Id: colplate.h 1282 2006-06-09 09:46:49Z alex $
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 */
// colplate.h - Definitions for colour separations in ColourContexts


#ifndef INC_COLPLATE
#define INC_COLPLATE

//#include "doccolor.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "listitem.h" - in camtypes.h [AUTOMATICALLY REMOVED]

class IndexedColour;


typedef enum
{
    COLOURPLATE_NONE,           // No colour plate (normal rendering operation)

    COLOURPLATE_COMPOSITE,      // Composite print-preview (colour matching)

    COLOURPLATE_CYAN,           // Process colour separation plates
    COLOURPLATE_MAGENTA,
    COLOURPLATE_YELLOW,
    COLOURPLATE_KEY,

    COLOURPLATE_SPOT            // Spot colour separation plate
} ColourPlateType;



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

>   typedef enum ScreenType

    Author:     Mike_Kenny (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/6/95
    Purpose:    enumeration of the screen types we support inside a plate

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

typedef enum ScreenType
{
    SCRTYPE_NONE,
    SCRTYPE_SPOT1,
    SCRTYPE_SPOT2,
    SCRTYPE_TRIPLESPOT1,
    SCRTYPE_TRIPLESPOT2,
    SCRTYPE_ELLIPTICAL,
    SCRTYPE_LINE,
    SCRTYPE_CROSSHATCH,
    SCRTYPE_MEZZOTINT,
    SCRTYPE_SQUARE,
    SCRTYPE_DITHER
};


/********************************************************************************************
 
>   class ColourPlate : public ListItem

    Author:     Jason_Williams (Xara Group Ltd) <camelotdev@xara.com>
    Date:       20/12/95

    Purpose:    The ColourPlate class is used as a descriptor defining how a colour context
                should separate/filter a colour as it is converted.

                The ColourPlate indicates what type of separation plate is required, e.g
                none, cyan, or spot. In the case of a spot plate, the ColourPlate also
                retains a pointer to the spot colour for which a plate is required.

                A flag is available, Negate, which controls if a normal or "photographic
                negative" plate is required.

    Notes:      You can't change a colour plate "on the fly", as you must attach a new 
                one to a colour context in order to make caching of colours work
                correctly. Thus, to change the plate, you must build a new one.

    SeeAlso:    ColourContext::SetColourPlate

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

class ColourPlate : public ListItem
{
    CC_DECLARE_DYNCREATE(ColourPlate);

public:     // Construction/destruction
    ColourPlate();
    virtual ~ColourPlate();

    ColourPlate(ColourPlateType TheType, BOOL MonochromePlate = FALSE, BOOL NegatePlate = FALSE);
    ColourPlate(IndexedColour *SpotColour, BOOL MonochromePlate = FALSE, BOOL NegatePlate = FALSE);

    ColourPlate(const ColourPlate &Other);
    ColourPlate &operator=(const ColourPlate &Other);


public:     // Special user-interface functions
    void GetDescription(StringBase *Description);
            // Gets a description of this colour plate (e.g. "Cyan", "Gold (Spot)")

    void GetDisplayColour(DocColour *Colour);
            // Gets a display colour to be used when showing a colour patch display
            // for this plate.


public:     // Retrieving current settings
    BOOL IsDisabled(void)               { return(Disabled); };
            // Returns TRUE if this plate is temporarily disabled

    ColourPlateType GetType(void)       { return(Type); };
            // Gets the colour plate type that this object represents

    IndexedColour  *GetSpotColour(void)     // Gets the spot colour (if any) which this spot plate contains
    {
        return(Spot.FindParentIndexedColour()); 
    };
    
    BOOL IsMonochrome(void)             { return(Monochrome); };
            // Returns TRUE if this plate should contain only monochromatic values
    
    BOOL IsNegative(void)               { return(Negate); };
            // Returns TRUE if this plate is a photographic negative

    double GetScreenAngle(void)         { return(ScreenAngle); };
            // Returns the screen angle (0..360 degrees)

    double GetScreenFrequency(void)     { return(ScreenFrequency); };
            // Returns the screen frequency

    ScreenType GetScreenFunction(void)  { return(ScreenFunction); };
            // Returns the screen function
    
    BOOL ActiveScreening(void)          { return(ActiveScreens); };
            // Returns TRUE if this plate uses screening

    BOOL Overprints(void)               { return(Overprint); };
            // Returns TRUE if graphics (non-text) objects should overprint


public:     // Changing current settings - use as infrequently as possible
    void SetDisabled(BOOL IsDisabled = TRUE);
            // Disables/enables the output of this plate. This has 2 uses:
            // 1. Stops the plate being printed by the main print loop
            // 2. If the plate is rendered, can be used as a temporary flag to stop
            //    colour separation and correction during output.

    void SetPlateInfo(ColourContext *Parent, ColourPlateType TheType,
                        BOOL MonochromePlate = FALSE, BOOL NegatePlate = FALSE);

    void SetPlateInfo(ColourContext *Parent, IndexedColour *SpotColour,
                        BOOL MonochromePlate = FALSE, BOOL NegatePlate = FALSE);

    void SetType(ColourContext *Parent, ColourPlateType TheType, IndexedColour *SpotColour = NULL);
            // Set this plate to be of a particular type

    void SetScreenInfo(double Angle, double Frequency);
            // Sets screen angle/frequency for this plate
    
    void SetScreenFunction(ScreenType func);
            // Sets screen type for this plate

    void SetActiveScreening(BOOL On = TRUE);
            // Turns on screen usage for this plate

    void SetOverprint(BOOL On = TRUE);
            // Enable/Disable overprint for this plate

    void SetMonochrome(ColourContext *Parent, BOOL On = TRUE);
            // Force all output to be monochrome (print) or plate-coloured (preview)

    void SetNegative(ColourContext *Parent, BOOL On = TRUE);
            // Force all output to be photographically negated (or normal)

    void ResetScreenToDefaults(INT32 DeviceDPI = 1200, INT32 DefaultFrequency = 60);
            // Makes this colour plate reset to recommended screen angle settings for
            // the current printer resolution (dpi) and screen frequency (lpi)


protected:  // Internal helper functions
    void InitObject(ColourPlateType NewType);
            // Sets a new Type for this plate, and initisalises all other member variables
            // to sensible default values for the given plate type.


protected:  // Internal data
    BOOL Disabled;                  // TRUE if this ColourPlate is disabled (used to temporarily turn
                                    // off colour separation for specific colours like UI/EOR DocColours)

    ColourPlateType Type;           // The type of separation/plate desired


    DocColour Spot;                 // References the spot colour (spot plates only)

    double ScreenAngle;             // The screen angle for this plate
    double ScreenFrequency;         // The screen frequency for this plate

    BOOL Overprint;                 // TRUE if this plate should overprint, FALSE if it should knock-out
    BOOL Monochrome;                // TRUE if the plate should contain only monochromatic shades
                                    // (if FALSE, e.g. a Cyan separation will be shades of Cyan)
    BOOL Negate;                    // TRUE if the plate should be a negative image
    BOOL ActiveScreens;             // TRUE if the screening is active

    ScreenType  ScreenFunction;     // The screen function to use (Spot1/Spot2 etc)
};

#endif          // INC_COLPLATE

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