105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
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/*****************************************************************************\
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FILE: pictures.h
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DESCRIPTION:
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Manage the pictures in the user's directories. Convert them when needed.
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Handle caching and making sure we don't use too much diskspace. Also add
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picture frames when needed.
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PERF:
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The biggest perf impact on this screen saver is how we handle loading the pictures.
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1. If we load to many pictures, we will start paging and blow the texture
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memory.
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2. If we recycle too much or too little, we will either use too much memory or look too repeative.
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3. Latency is a killer. We want the main thread being CPU and video card bound while
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we have a background thread loading and uncompressing images. This will allow
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the background thread to be I/O bound so the forground can still render fairly well.
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We need to decide a size and scale pictures down to that size. This will reduce the memory
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requirements. If we determine that smallest picture we can use that will still look good,
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we should be okay.
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Here are some numbers:
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Images Size Each Picture For 18 Images
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=========== ============= =============
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320x240 .152 MB 5.47 MB
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640x480 .6 MB 21 MB
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800x600 .96 MB 34 MB
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1024x768 1.5 MB 54 MB
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BryanSt 12/24/2000
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Copyright (C) Microsoft Corp 2000-2001. All rights reserved.
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\*****************************************************************************/
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#ifndef PICTURES_H
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#define PICTURES_H
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#include "util.h"
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#include "main.h"
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#include "config.h"
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class CPictureManager;
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extern CPictureManager * g_pPictureMgr;
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#define GNPF_NONE 0x00000000
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#define GNPF_RECYCLEPAINTINGS 0x00000001 // The picture is probably in a side room so reuse pictures to keep memory use down.
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#define MAX_PICTURES_IN_BATCH 7
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typedef struct
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{
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LPTSTR pszPath;
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CTexture * pTexture;
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BOOL fInABatch; // Has this painting been loaded?
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} SSPICTURE_INFO;
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typedef struct
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{
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SSPICTURE_INFO * pInfo[MAX_PICTURES_IN_BATCH];
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} SSPICTURES_BATCH;
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class CPictureManager
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{
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public:
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// Member Functions
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HRESULT GetPainting(int nBatch, int nIndex, DWORD dwFlags, CTexture ** ppTexture);
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HRESULT PreFetch(int nBatch, int nToFetch);
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HRESULT ReleaseBatch(int nBatch);
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CPictureManager(CMSLogoDXScreenSaver * pMain);
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virtual ~CPictureManager();
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private:
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// Private Functions
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// Enum and build of picture list
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HRESULT _PInfoCreate(int nIndex, LPCTSTR pszPath);
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HRESULT _EnumPaintings(void);
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HRESULT _AddPaintingsFromDir(LPCTSTR pszPath);
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// Create a batch
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HRESULT _LoadTexture(SSPICTURE_INFO * pInfo, BOOL fFaultInTexture);
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HRESULT _GetNextWithWrap(SSPICTURE_INFO ** ppInfo, BOOL fAlreadyLoaded, BOOL fFaultInTexture);
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HRESULT _TryGetNextPainting(SSPICTURE_INFO ** ppInfo, DWORD dwFlags);
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HRESULT _CreateNewBatch(int nBatch, BOOL fFaultInTexture);
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// Member Variables
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HDSA m_hdsaPictures; // Contains SSPICTURE_INFO. We want each painting in m_hdpaPaintings to be ref-counted.
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int m_nCurrent;
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HDSA m_hdsaBatches; // Contains Batches (SSPICTURES_BATCH)
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int m_nCurrentBatch; //
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CMSLogoDXScreenSaver * m_pMain; // Weak reference
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};
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#endif // PICTURES_H
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