scanrr.h

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// $Id: scanrr.h 1282 2006-06-09 09:46:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
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              respective authors. See AUTHORS file for details.

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----------------------------------

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=================================XARAHEADEREND============================
 */
// The Scanning Render region class

#ifndef INC_SCANRR
#define INC_SCANRR

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

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

>   class NodeListItemWithDocPtr : public NodeListItem

    Author:     Chris_Snook (Xara Group Ltd) <camelotdev@xara.com>
    Created:    10/7/2000
    Purpose:    This is used to ensure that blends print correctly.  If a particular
                NodeBlender was classified as simple, and is later used with a blend
                that is complex, then complex blend steps will not render.  This class
                allows us to reclassify a simple node as a complex one.
    SeeAlso:    -

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

class NodeListItemWithComplexity : public NodeListItem
{
public:
    CC_DECLARE_DYNAMIC( NodeListItemWithComplexity )
    NodeListItemWithComplexity();                           // will contain a NULL pointer
    NodeListItemWithComplexity(Node* WhichNode, BOOL val);  // initialise pNode to be WhichNode
    ~NodeListItemWithComplexity() {}                        // Nothing to destruct
    
    BOOL wasClassifiedSimple;                       // was the node classified as simple?
    INT32 RunLength;
    DocRect BoundsRect;
};

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

>   class ScanningRenderRegion : public RenderRegion

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    6/4/95
    Purpose:    The Scanning Render Region is a special sort of render region that simply
                scans the document and works out where abouts there are complex shapes that
                can not be rendered by a normal OSRenderRegion. Complex shapes are shapes
                that are transparant or any other attribute that we are unable to render
                to normally. The Scanning Render Region is used to help with things like
                printing, Renderable EPS export etc where transparancy is not available.

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

class ScanningRenderRegion : public RenderRegion
{
    // Give my name in memory dumps
    CC_DECLARE_DYNAMIC(ScanningRenderRegion);

    // Construction and destruction
    ScanningRenderRegion(BOOL Printing);
    ~ScanningRenderRegion();

    // Starting and stopping the rendering process
    virtual BOOL StartRender();
    virtual BOOL StopRender();

    // Functions that are meant to do the drawing
    virtual void DrawPathToOutputDevice(Path *PathToRender, PathShape shapePath=PATHSHAPE_PATH);
    virtual void DrawRect(DocRect *RectToRender);
    virtual void DrawLine(const DocCoord &StartPoint, const DocCoord &EndPoint);
    virtual void DrawPixel(const DocCoord &Point);

    // Functions that are supposed to draw bitmaps
    virtual void DrawBitmap(const DocCoord &Point, KernelBitmap* pBitmap);
    virtual void DrawBitmap(const DocCoord &Point, UINT32 BitmapID, UINT32 ToolID = NULL);
    virtual BOOL DrawTransformedBitmap(NodeBitmap *pNodeBitmap);

    // Other Pure virtual drawing functions that have to be overidden
    virtual void DrawDragRect(DocRect *RectToRender);
    virtual void DrawBlob(DocCoord p, BlobType type);
    virtual void DrawCross(const DocCoord &Point, const UINT32 Size);
    virtual void DrawBitmapBlob(const DocCoord &Point, KernelBitmap* BlobShape);
    virtual void DrawBitmapBlob(const DocCoord &Point, ResourceID resID );

    // Pure Virtual functions that have to be overidden to use this class.
    // They all do nothing in this class
    virtual void InitClipping();
    virtual void InitAttributes();
    virtual void SetLineAttributes();
    virtual void SetOSDrawingMode();
    virtual void SetQualityLevel();
    virtual MILLIPOINT CalcPixelWidth();
    virtual MILLIPOINT CalcScaledPixelWidth();

    // Force this to return a sensible value so that the capture system
    // doesn't get horribly upset
    virtual double GetPixelsPerInch() { return 96.0; }

    // Make sure that offscreen attrs are rendered when out of bounds
    virtual BOOL CheckOffscreenBounds() { return(FALSE); }

    // Function to work out what things this type of render region is capable of rendering
    virtual void GetRenderRegionCaps(RRCaps* pCaps);

    // Function to tell the scanning render region what the region it is scanning
    // for can render.
    void SetHostRRCaps(const RRCaps& pCaps);

    // Functions to get at the info held by the scanning render regions
    Node* GetFirstComplexObject();
    Node* GetLastComplexObject();

    // Find the number of nodes in various sections of the tree
    INT32 GetNumComplex();

    // Function to find out the size of the bounding rect that covers all complex shapes
    DocRect GetComplexBounds();

    // Function to find out if we are done yet
    BOOL IsFinished();

    // Functions to get at the list of runs etc
    BOOL IsFirstNodeComplex();
    Node* FindFirstFromList();
    Node* FindNextFromList();
    BOOL IsThisNodeComplex();
    DocRect GetSpanBounds();

    void SetRenderState(Node *RenderState);

protected:
    // Function that is called when a complex shape has been found
    void ComplexShapeFound() { bIsComplex = TRUE; };
    void ComplexShapeFoundHelper();     // CGS (12/10/2000):  MUST take NodeBlenders of compound nodes into account!
    void SimpleShapeFound() { bIsSimple = TRUE; };
    void SimpleShapeFoundHelper();      // CGS (12/10/2000):  MUST take NodeBlenders of compound nodes into account!

public:
    void ComplexShapeFoundWrapper();    // CGS (20/10/2000):  allows us to access ComplexShapeFound directly.
                                        // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                                        // YOU SHOULD ONLY CALL THIS FUNCTION IF YOU KNOW WHAT YOU ARE DOING !!!!!!!
                                        // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
#ifdef _DEBUG
    void DumpNodeRuns();
#endif


protected:
    // Vars that the Scanning render region uses
    // The first and last complex objects
    Node* pFirstComplex;
    Node* pLastComplex;

    // The number of complex shapes in the region
    INT32 NumComplexShapes;

    // a rectangle that holds the bounds of all the complex shapes in the render region
    DocRect ComplexBounds;
    DocRect SpanBounds;

    // List of runs of complex and non-complex nodes
    List NodeRuns;
    NodeListItemWithComplexity* pCurrentListItem;
    BOOL IsFirstComplex;
    BOOL IsThisTheFirstNode;
    BOOL InComplexRun;
    INT32 RunLength;

    BOOL bIsComplex;
    BOOL bIsSimple;
    ClipRegionAttribute* pLastClipAttr;

private:
    // A flag to say if we have finished rendering or not
    BOOL IsFinishedRendering;

    // The Caps for the region we are scanning on behlaf of
    RRCaps HostCaps;
};



#endif  // INC_SCANRR

---