ppairbsh.h

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// $Id: ppairbsh.h 751 2006-03-31 15:43:49Z alex $
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 */
// ppairbsh - Definition of rendering PathProcessor classes for Airbrushed Path Stroking

#ifndef INC_PPAIRBSH
#define INC_PPAIRBSH

#include "ppstroke.h"

class View;
class GRenderBitmap;
class ValueFunction;

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

>   class PathProcessorStrokeAirbrush : public PathProcessor

    Author:     Jason_Williams (Xara Group Ltd) <camelotdev@xara.com> & Richard
    Created:    20/12/96

    Purpose:    A path processor which renders paths as airbrushed strokes

                These classes are created by attributes (or similar) when rendered,
                and placed on a stack in the RenderRegion. Whenever RenderRegion::DrawPath
                is invoked to render a path, all stacked PathProcessors will be called in
                turn, and they call back to RenderRegion functions to render whatever they
                wish (usually a modified form of the original path).

                This can be used to "filter" almost any rendering, but is mainly intended
                for use by stroke and fill providers, which replace input paths with more
                suitable shapes to be rendered.

    SeeAlso:    RenderRegion::DrawPath; PathProcessor::ProcessPath

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

class PathProcessorStrokeAirbrush : public PathProcessorStroke
{
friend class RenderRegion;
CC_DECLARE_DYNAMIC(PathProcessorStrokeAirbrush);


public:         // RenderRegion path-processing interface
    PathProcessorStrokeAirbrush()                   { pIntensityFunction = NULL; };
    ~PathProcessorStrokeAirbrush();

    virtual void ProcessPath(Path *pPath,
                             RenderRegion *pRender,
                             PathShape ShapePath = PATHSHAPE_PATH);

    virtual BOOL WillChangeFillAndStrokeSeparately(void);


public:         // Specialised interface
    virtual BOOL IsDifferent(PathProcessorStroke *pOther);
            // Returns TRUE if the pOther is considered to be a different processor type

    virtual PathProcessorStroke *Clone(void);
            // Creates a copy of this object. Must be overridden by derived classes!

    virtual BOOL NeedsTransparency() const {return TRUE;};
            // This processor needs transparency (like no tomorrow, etc...)


protected:
    // Get the number of steps to use for this stroke
    virtual INT32 GetNumSteps(View *pView, INT32 LineWidth);

    // Construct a greyscale palette
    LOGPALETTE *MakeGreyScalePalette(void);

    // Actually render the airbrush
    virtual BOOL RenderAirBrush(Path *pPath, GRenderBitmap *pRegion, INT32 LineWidth,
            INT32 NumSteps, ValueFunction *pvValueFunction, RenderRegion *pDestRegion,
            PathShape ShapePath);

public:     // Specialised interface
    ValueFunction *GetIntensityFunction(void);
    void SetIntensityFunction(ValueFunction *pFunc);


private:
    ValueFunction *pIntensityFunction;          // A ValueFunction describing the airbrush intensity curve

};

#endif

---