bitmapcache.h

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// $Id: bitmapcache.h 751 2006-03-31 15:43:49Z alex $
// BitmapCache.h: interface for the CBitmapCache class.
//
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

This file is part of Xara LX.

Xara LX is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License version 2 as published
by the Free Software Foundation.

Xara LX and its component source files are distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with Xara LX (see the file GPL in the root directory of the
distribution); if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA  02110-1301 USA


ADDITIONAL RIGHTS
-----------------

Conditional upon your continuing compliance with the GNU General Public
License described above, Xara Group Ltd grants to you certain additional
rights. 

The additional rights are to use, modify, and distribute the software
together with the wxWidgets library, the wxXtra library, and the "CDraw"
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by Xara Group Ltd requires in order to compile and execute, including
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Nothing in this section restricts any of the rights you have under
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----------------

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files only, and does not necessarily apply to other Xara products which may
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      Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK.
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=================================XARAHEADEREND============================
 */

#if !defined(AFX_BITMAPCACHE_H__41BFBD9B_A02E_4205_AE0A_4F6A5E0DC7D0__INCLUDED_)
#define AFX_BITMAPCACHE_H__41BFBD9B_A02E_4205_AE0A_4F6A5E0DC7D0__INCLUDED_

//#include <afxtempl.h>
#include "bitmapcachekey.h"
#include "bitmap.h"

#define CACHEPRIORITY_NORMAL 0
#define CACHEPRIORITY_TEMPBITMAP_LOW 0
#define CACHEPRIORITY_TEMPBITMAP_HIGH 1000
#define CACHEPRIORITY_PERMANENT 8000


class CCachedBitmap: public CCObject
{
public:
    CCachedBitmap();
    CCachedBitmap(LPBITMAPINFO pNewInfo, LPBYTE pNewBits, INT32 nNewPriority = CACHEPRIORITY_NORMAL);
    CCachedBitmap(const CCachedBitmap& cbmp);
    CCachedBitmap(UINT32 Width, UINT32 Height, UINT32 Depth, DocRect rect, INT32 nNewPriority = CACHEPRIORITY_NORMAL);
    ~CCachedBitmap();

    bool operator==(const CCachedBitmap& cbmp) const;
    const CCachedBitmap& operator=( const CCachedBitmap& cbmp );

    void            Release();
    CCachedBitmap   Copy();
    void            Transform(TransformBase& Trans);
    DocRect         GetCachedRect();
    void            SetCachedRect(DocRect r);
    void            SetCachedParallelogram(DocCoord* pCoords, UINT32 numCoords);

    BOOL            IsValid() const;
    UINT32          GetBitmapSize() const;
    BOOL            IsTransparent() const;
    UINT32          GetBPP() const;

public:
    LPBITMAPINFO    pbmpInfo;
    LPBYTE          pbmpBits;
//  DocRect         rectCachedRect;
    DocCoord        coord0;             // Three coords representing a parallelogram alow the bitmap to be transformed
    DocCoord        coord1;             // (mainly for use with destructive liveffects but also good for quick blits
    DocCoord        coord2;             //  of cached info during dragging)
    INT32           nPriority;
    BOOL            bFullCoverage;      // TRUE when this bitmap fully covers the relevant object
};


// Declare global template-specific override for HashKey function...
struct LessBitmapCacheKey
{
  bool operator()(const CBitmapCacheKey &s1, const CBitmapCacheKey &s2) const
  {
      return s1.Hash() < s2.Hash();
  }
};

typedef std::map<CBitmapCacheKey, CCachedBitmap, LessBitmapCacheKey> CCacheKeyMap;

class CBitmapCache
{
public:
    CBitmapCache();
//  virtual ~CBitmapCache();

// Methods
public:
    void            Initialise();
    void            DeInitialise();

    void            StoreBitmap(const CBitmapCacheKey& key, const CCachedBitmap& bitmap);
//  CCachedBitmap   FindBitmap(const CBitmapCacheKey& key);
    CCachedBitmap   RemoveBitmap(const CBitmapCacheKey& key);
    BOOL            RemoveAllOwnedBitmaps(  const CBitmapCacheKey& key,
                                            const BOOL bOpaqueOnly = FALSE,
                                            const INT32 maxpriority = CACHEPRIORITY_TEMPBITMAP_HIGH);
    void            RemoveLowPriorityBitmaps(const INT32 maxpriority = CACHEPRIORITY_TEMPBITMAP_HIGH);
    CCachedBitmap   FindNextOwnedBitmap(CCacheKeyMap::iterator &pos,
                                        CBitmapCacheKey &key,
                                        const BOOL bOpaqueOnly = FALSE,
                                        const INT32 maxpriority = CACHEPRIORITY_TEMPBITMAP_HIGH);
    void            SetMaximumDataSize(UINT64 maxsize);
    UINT64          GetMaximumDataSize();
    UINT32          GetCurrentDataSize();

#ifdef _DEBUG
    void            DebugDump();
#endif

    // Some CMap emulation functions
    BOOL Lookup( const CBitmapCacheKey &Key, CCachedBitmap &CachedBitmap )
    {
        CCacheKeyMap::iterator iter = m_map.find( Key );
        if( m_map.end() == iter )
            return false;
        
        CachedBitmap = iter->second;
        return true;
    }

    CCacheKeyMap::iterator GetStartPosition() {return m_map.begin();}

// Public helper functions
public:
    static UINT64 CalcRecommendedMaximumDataSize();

// Private helper functions
private:
//  UINT32          PrimeAbove(UINT32 number);
    CCachedBitmap   RemoveRandomBitmap(const INT32 maxpriority = CACHEPRIORITY_TEMPBITMAP_HIGH);            // Cache removal policy helper

// Internal members
private:
    CCacheKeyMap    m_map;

    UINT64      m_lMaxDataSize;
    UINT32          m_lCurrentDataSize;
    UINT32          m_lMaxHashTableLoad;

// Preferences
    static INT32 CacheRAMPercent;           // Amount of free RAM to grab for cacheing

};

#endif // !defined(AFX_BITMAPCACHE_H__41BFBD9B_A02E_4205_AE0A_4F6A5E0DC7D0__INCLUDED_)

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