canvas/source/opengl/ogl_texturecache.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #pragma once
  11
  12 #include <sal/types.h>
  13 #include <unordered_map>
  14
  15 namespace com::sun::star::geometry { struct IntegerSize2D; }
  16
  17
  18 namespace oglcanvas
  19 {
  20     class TextureCache
  21     {
  22     public:
  23         TextureCache();
  24         ~TextureCache();
  25
  26         /// clear whole cache, reset statistic counters
  27         void flush();
  28
  29         /** prune old entries from cache
  30
  31             Every time this method is called, all cache entries are set
  32             to "old". If subsequently not used by getTexture(),
  33             they'll be entitled for expunge on the next prune()
  34             call. Resets statistic counters.
  35          */
  36         void prune();
  37
  38         /// Statistics
  39         size_t getCacheSize() const { return maCache.size(); };
  40         sal_uInt32 getCacheMissCount() const { return mnMissCount; }
  41         sal_uInt32 getCacheHitCount() const { return mnHitCount; }
  42
  43         unsigned int getTexture( const css::geometry::IntegerSize2D& rPixelSize,
  44                                  const sal_Int8*                                  pPixel,
  45                                  sal_uInt32                                       nPixelCrc32) const;
  46     private:
  47         struct CacheEntry
  48         {
  49             CacheEntry() : nTexture(0), bOld(false) {}
  50             unsigned int nTexture;
  51             bool bOld;
  52         };
  53         typedef std::unordered_map<sal_uInt32,CacheEntry> TextureCacheMapT;
  54         mutable TextureCacheMapT maCache;
  55         mutable sal_uInt32       mnMissCount;
  56         mutable sal_uInt32       mnHitCount;
  57     };
  58 }
  59
  60 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */