rgnlist.h

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// $Id: rgnlist.h 751 2006-03-31 15:43:49Z alex $
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 */

#ifndef INC_RGNLIST
#define INC_RGNLIST

#include "list.h"
#include "listitem.h"
#include "docrect.h"

class RenderRegion;  // #include "rndrgn.h"
class Document;
class View;
class Node;

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

>   class RenderRegionList : public List

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/5/93
    Purpose:    Holds a list of RenderRegion objects for the application to process.
                It should be used to add or remove render regions, or to initiate background
                rendering on idle events.
    SeeAlso:    RenderRegion

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

class CCAPI RenderRegionList : public List
{
CC_DECLARE_MEMDUMP(RenderRegionList);

public:
    // Constructor
    RenderRegionList();
    
    // Destructor
    ~RenderRegionList();
    
    // Functions to add and delete render regions from the list.
    void Merge(RenderRegion *NewRegion);
    void Remove(RenderRegion *);
    void Remove(Document *); // Removes all render regions associated with this document
    void Remove(View *); // Removes all render regions associated with this document view
    
    // Functions to do some rendering
    BOOL BackgroundRender();
    void ImmediateRender(BOOL bForceImmediate = FALSE);

    void HandleNodeDeletion(Node* pNode);
    
private:
    // Pointer to the last region rendered
    RenderRegion *LastRendered;
    
    MILLIPOINT PixelWidth;  // The width of a pixel, used for rectangle merging.
    
    // This flag is so we don't do merging checks unnecessarily during background rendering.
    BOOL ListIsOptimal;

    // Functions to compact the render region list, if possible
    void TidyUpAdjacentRegions(RenderRegion*);
    void MergeRenderRegions(RenderRegion* NewRenderRegion);
    void StrictMerge(RenderRegion* pRegionToMerge);
    void RemoveRegionOverlap(RenderRegion* NewRenderRegion);
    void ClipRectsToClient();
    void TryTotalUnion();
    void DoTotalUnion(RenderRegion *pRegion, View *pView, DocRect TotalUnion);

};

#endif

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