offattr.h

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// $Id: offattr.h 1282 2006-06-09 09:46:49Z alex $
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 */

#ifndef INC_OFFSCREENATTR
#define INC_OFFSCREENATTR

// structs, typedefs, defines

// class definitions
//  1 - call classes member functions,
//  2 - use the class type for one of the members (not required if have pointer to class ??)
//  3 - to derive a superclass??
//#include "attrval.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "gla.h"

// class predeclarations
class KernelBitmap;
class GRenderRegion;

// debugging
// Create a bitmap copy of the feathered object for comparison with the bitmap generated
// via the offscreen rendering system (ie m_pOffscreenBitmapInfo/Bits inside GoingOutOfScope)
// NB Set _DEBUG_OFFSCREEN_PIXEL_WIDTH, leave _DEBUG_OFFSCREEN_MP_WIDTH as is
// ( See notes in fthrattr.cpp for useage guidelines )
//#define _DEBUG_OFFSCREEN_PIXEL_WIDTH      44
//#define _DEBUG_OFFSCREEN_MP_WIDTH         _DEBUG_OFFSCREEN_PIXEL_WIDTH * 750

//
//                              Helper functions
//
// Conversion between millipoints and pixels at current view scale
FIXED16 GetCurrentViewScale();
MILLIPOINT ConvertMeasurementToMillipointsAtCurrentViewScale(INT32 Width, UnitType type);
UINT32 ConvertMillipointsToPixelsAtCurrentViewScale(MILLIPOINT mp);
INT32 PixelsPerMeterAtCurrentViewScale();

//
//                              AttributeValue classes
//

/********************************************************************************************
>   class OffscreenAttrValue : public GeometryLinkedAttrValue
    Author:     Ilan_Copelyn (Xara Group Ltd) <camelotdev@xara.com>
    Created:    2/06/2000
    Purpose:    Provides a superclass from which you can derive attributes which require
                the nodes which they affect to be rendered offscreen.
    SeeAlso:    
    Notes:      This attribute is not meant to be instantated directly!
                It has no AttrIndex and is not added to the default attribute table
                when the attribute manager initialises itself
 ********************************************************************************************/

class OffscreenAttrValue : public GeometryLinkedAttrValue
{
    CC_DECLARE_DYNAMIC( OffscreenAttrValue )
    
protected:
    OffscreenAttrValue();       // not meant to be instantiated directly
public:
    ~OffscreenAttrValue();

public:
    // Standard functions required by Attribute framework 
    virtual BOOL IsDifferent(AttributeValue*);

    // Karim 17/08/2000
    // This override is required so that the m_fForceTransparency flag is copied around.
    virtual void SimpleCopy(AttributeValue *pOther)
    {
        GeometryLinkedAttrValue::SimpleCopy(pOther);
        m_fForceTransparency = ((OffscreenAttrValue*)pOther)->m_fForceTransparency;
    }

    // Generic attr rendering functions (rely on GRenderRegion offscreen rendering system to do the work)
    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);

    // Query function for GRenderRegion
//  virtual BOOL OffscreenBmpRectMayExceedViewableRect() { return FALSE; }  // not used at the moment. might by required though
    virtual DocRect GetOffscreenBoundingRect();
    virtual void    SetOffscreenBoundingRect(const DocRect drOffBB) { m_OffBB = drOffBB; }

    // Allow derived classes to overide integral parts of the offscreen bmp setup process
    virtual BOOL DoesOffscreenBmpRequireTransp(GRenderRegion* pGRR = NULL);
    BOOL TestNodeForTransparency(Node* pNode = NULL);
    virtual void GetMinimumOffscreenBmpDimensions(UINT32* RequiredWidth, UINT32* RequiredHeight) { *RequiredWidth=0;*RequiredHeight=0; }
    virtual BOOL DoesOffscreenBMPCaptureBackground() {return FALSE;}

    // Karim 17/08/2000 - force this attr to always use a transparency-capable offscreen bmp.
    void SetAlwaysUseTransparency()     { m_fForceTransparency = TRUE; }
    // Karim 17/08/2000
    // let this attr choose whether or not to use a transparency-capable offscreen bitmap.
    void UnsetAlwaysUseTransparency()   { m_fForceTransparency = FALSE; }

    // Overide this to use the offscreen bitmap
    virtual void OffscreenRenderingCompleted(RenderRegion *pRender, LPBITMAPINFO lpBitmapInfo, LPBYTE lpBits, DocRect BitmapRect) = 0;

    //-------------------------------------------------------------------------------------------------------------
    //  Debugging your offscreen attribute
    //
#ifdef _DEBUG_OFFSCREEN_PIXEL_WIDTH
protected:
    // Debugging function. Creates bitmap of a node using new GRenderBitmap RR.
    // Useful for comparing to offscreen bitmap.
    KernelBitmap* CreateIntermediateBitmap( GRenderRegion* GRR, Node* pNode, double ScreenResMultiplier, 
                                            UINT32 bpp, BOOL UseInternalFmt );
    BOOL RenderDebuggingBitmaps(GRenderRegion* GRR, Node* pNode, double ScreenResMultiplier,
                                            UINT32 bpp, BOOL UseInternalFmt );
#endif

protected:
    //-------------------------------------------------------------------------------------------------------------
    //                                      Member Variables
    //

    // Offscreen rendering attributes:
    DocRect                     m_OffBB;

    // Karim 16/08/2000
    // a record of whether or not our linked node requires transparency.
    BOOL                        m_fForceTransparency;
//  DocRect                     m_ViewBB;

#ifdef _DEBUG_OFFSCREEN_PIXEL_WIDTH
    // Debugging members
    KernelBitmap*               md_NodeBmp;
    KernelBitmap*               md_SlicedBmp;
#endif


    //-------------------------------------------------------------------------------------------------------------

#ifdef DEBUGOFFSCREENATTRS
private:
    // Debug render-twice flag. See OffscreenAttrValue::Render() for more info.
    BOOL m_fHasBeenRendered;
#endif
};


#endif //INC_OFFSCREENATTR

---