pathpcs.cpp

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// $Id: pathpcs.cpp 1282 2006-06-09 09:46:49Z alex $
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 */
// pathpcs - Definition of rendering PathProcessor class

#include "camtypes.h"

#include "pathpcs.h"

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

CC_IMPLEMENT_DYNAMIC(PathProcessor, CCObject);

// Declare smart memory handling in Debug builds
#define new CAM_DEBUG_NEW



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

>   PathProcessor::PathProcessor()

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

    Purpose:    Constructor

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

PathProcessor::PathProcessor()
{
    NextProcessor = NULL;
    ParentAttr    = NULL;
    m_DisableMe   = FALSE;
}



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

>   virtual PathProcessor::~PathProcessor()

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

    Purpose:    Destructor
    
    Errors:     If this object still has a non-NULL Next pointer, it will ERROR3 in
                an effort to get you to clean up properly before destruction.

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

PathProcessor::~PathProcessor()
{
    ERROR3IF(NextProcessor != NULL, "PathProcessor deleted while still possibly held in stack");
}



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

>   virtual BOOL PathProcessor::WillChangeFillAndStrokeSeparately(void)

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

    Purpose:    Called by the RenderRegion to determine if this PathProcessor affects
                the "fill" and "stroke" portions of the path separately. (Generally
                speaking, only fill/stroke providers will cause these two different
                "bits" of a path to be rendered separately). This call is made BEFORE
                this Processor's ProcessPath function will be called.

                If the caller gets a TRUE back, the stroke and fill paths will be
                rendered separately.

    Notes:      Base class implementation returns FALSE. Derived Stroke and Fill
                processors should probably override this method to return TRUE.

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

BOOL PathProcessor::WillChangeFillAndStrokeSeparately(void)
{
    return(FALSE);
}



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

>   virtual void PathProcessor::ProcessPath(Path *pPath, RenderRegion *pRender) = 0;

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

    Purpose:    ABSTRACT FUNCTION - see derived classes

                Called by the RenderRegion to apply the path processing operation to 
                the given path.

    Notes:      * When rendering a path, always pass in your 'this' pointer to
                  RenderRegion::DrawPath, so that you don't start an infinite
                  recursion!

                * To stop rendering of the path, simply return without calling the RR

                * To render this path unchanged, simply call directly back to the RR:
                    pRender->DrawPath(pPath, this);
                
                * Only affect the fill of this path if pPath->IsFilled

                * Only affect the stroke of this path if pPath->IsStroked

                * If converting a path into a "filled path" for stroking, the output
                  path should be rendered with IsStroked=FALSE or it'll get a line
                  around the outside!               

                * If you render any attributes, etc, then you should preserve the
                  render region state with calls to SaveContext() and RestoreContext()

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


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

>   virtual BOOL PathProcessor::DoesActuallyDoAnything(RenderRegion* pRender)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    1/10/2000
    Inputs:     pRender - pointer to the render region that we are about to render our path into
    Returns:    TRUE if it is anticipated that this path processor will alter the path in any
                way, FALSE if not
    Purpose:    To determine whether or not our path processor is 'default' i.e. if does not 
                change the path at all.  If so then the render region will be free to use
                DrawPathToOutputDevice which will let us use dash patterns, arrowheads etc.
    
    Errors:     

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

BOOL PathProcessor::DoesActuallyDoAnything(RenderRegion* pRender)
{
    return !m_DisableMe;
}


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

>   void PathProcessor::SetDisabled(BOOL Value)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    1/10/00
    Inputs:     Whether or not to disable this PPB

    Purpose:    Sets the flag which we use to determine whether or not we should do anything
                when it comes to rendering.

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

void PathProcessor::SetDisabled(BOOL Value)
{
    m_DisableMe = Value;
}


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

>   BOOL PathProcessor::IsDisabled()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    1/10/00
    Inputs:     -
    Returns:    Whether or not we are disabled
    Purpose:    

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

BOOL PathProcessor::IsDisabled()
{
    return m_DisableMe;
}

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