sd/source/ui/tools/IconCache.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_sd.hxx"
  33
  34 #include "tools/IconCache.hxx"
  35
  36 #include "sdresid.hxx"
  37 #include <hash_map>
  38 #include <osl/doublecheckedlocking.h>
  39 #include <osl/getglobalmutex.hxx>
  40
  41 namespace sd {
  42
  43 //===== IconCache::Implementation =============================================
  44
  45 class IconCache::Implementation
  46 {
  47 private:
  48     friend class IconCache;
  49
  50     /** This pointer holds a valid reference from first time that
  51         IconCache::Instance() is called to the end of the sd module when the
  52         cache is destroyed from SdGlobalResourceContainer.
  53     */
  54     static IconCache* mpInstance;
  55
  56     typedef ::std::hash_map<USHORT,Image> ImageContainer;
  57     ImageContainer maContainer;
  58
  59     Image GetIcon (USHORT nResourceId);
  60 };
  61
  62 IconCache* IconCache::Implementation::mpInstance = NULL;
  63
  64
  65
  66 Image IconCache::Implementation::GetIcon (USHORT nResourceId)
  67 {
  68     Image aResult;
  69     ImageContainer::iterator iImage;
  70     iImage = maContainer.find (nResourceId);
  71     if (iImage == maContainer.end())
  72     {
  73         aResult = Image(BitmapEx(SdResId(nResourceId)));
  74         maContainer[nResourceId] = aResult;
  75     }
  76     else
  77         aResult = iImage->second;
  78     return aResult;
  79 }
  80
  81
  82
  83
  84 //===== IconCache =============================================================
  85
  86 //static
  87 IconCache& IconCache::Instance (void)
  88 {
  89     if (Implementation::mpInstance == NULL)
  90     {
  91         ::osl::GetGlobalMutex aMutexFunctor;
  92         ::osl::MutexGuard aGuard (aMutexFunctor());
  93         if (Implementation::mpInstance == NULL)
  94         {
  95             IconCache* pCache = new IconCache ();
  96             SdGlobalResourceContainer::Instance().AddResource (
  97                 ::std::auto_ptr<SdGlobalResource>(pCache));
  98             OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
  99             Implementation::mpInstance = pCache;
 100         }
 101     }
 102     else
 103     {
 104         OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
 105     }
 106
 107     DBG_ASSERT(Implementation::mpInstance!=NULL,
 108         "IconCache::Instance(): instance is NULL");
 109     return *Implementation::mpInstance;
 110 }
 111
 112
 113
 114
 115 Image IconCache::GetIcon (USHORT nResourceId)
 116 {
 117     return mpImpl->GetIcon (nResourceId);
 118 }
 119
 120
 121
 122
 123 IconCache::IconCache (void)
 124     : mpImpl (new Implementation())
 125 {
 126 }
 127
 128
 129
 130
 131 IconCache::~IconCache (void)
 132 {
 133     // empty
 134 }
 135
 136 } // end of namespace sd