1 files changed, 60 insertions, 0 deletions
diff --git a/canvas/source/opengl/ogl_texturecache.hxx b/canvas/source/opengl/ogl_texturecache.hxx
new file mode 100644
index 000000000..8d0a425ce
--- /dev/null
+++ b/canvas/source/opengl/ogl_texturecache.hxx
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <sal/types.h>
+#include <unordered_map>
+
+namespace com::sun::star::geometry { struct IntegerSize2D; }
+
+
+namespace oglcanvas
+{
+    class TextureCache
+    {
+    public:
+        TextureCache();
+        ~TextureCache();
+
+        /// clear whole cache, reset statistic counters
+        void flush();
+
+        /** prune old entries from cache
+
+            Every time this method is called, all cache entries are set
+            to "old". If subsequently not used by getTexture(),
+            they'll be entitled for expunge on the next prune()
+            call. Resets statistic counters.
+         */
+        void prune();
+
+        /// Statistics
+        size_t getCacheSize() const { return maCache.size(); };
+        sal_uInt32 getCacheMissCount() const { return mnMissCount; }
+        sal_uInt32 getCacheHitCount() const { return mnHitCount; }
+
+        unsigned int getTexture( const css::geometry::IntegerSize2D& rPixelSize,
+                                 const sal_Int8*                                  pPixel,
+                                 sal_uInt32                                       nPixelCrc32) const;
+    private:
+        struct CacheEntry
+        {
+            CacheEntry() : nTexture(0), bOld(false) {}
+            unsigned int nTexture;
+            bool bOld;
+        };
+        typedef std::unordered_map<sal_uInt32,CacheEntry> TextureCacheMapT;
+        mutable TextureCacheMapT maCache;
+        mutable sal_uInt32       mnMissCount;
+        mutable sal_uInt32       mnHitCount;
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */