1 files changed, 117 insertions, 0 deletions
diff --git a/canvas/source/opengl/ogl_texturecache.cxx b/canvas/source/opengl/ogl_texturecache.cxx
new file mode 100644
index 0000000000..43fb7d8e2e
--- /dev/null
+++ b/canvas/source/opengl/ogl_texturecache.cxx
@@ -0,0 +1,117 @@
+/* -*- 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/.
+ */
+
+#include <sal/config.h>
+
+#include <epoxy/gl.h>
+
+#include <com/sun/star/geometry/IntegerSize2D.hpp>
+
+#include "ogl_texturecache.hxx"
+
+
+using namespace ::com::sun::star;
+
+namespace oglcanvas
+{
+    TextureCache::TextureCache() :
+        maCache(101),
+        mnMissCount(0),
+        mnHitCount(0)
+    {}
+
+    TextureCache::~TextureCache()
+    {
+        flush();
+    }
+
+    void TextureCache::flush()
+    {
+        // un-bind any texture
+        glBindTexture(GL_TEXTURE_2D, 0);
+
+        // delete all cached textures
+        for( const auto& rCache : maCache )
+        {
+            glDeleteTextures( 1, &rCache.second.nTexture );
+        }
+
+        maCache.clear();
+        mnMissCount = 0;
+        mnHitCount  = 0;
+    }
+
+    void TextureCache::prune()
+    {
+        // un-bind any texture
+        glBindTexture(GL_TEXTURE_2D, 0);
+
+        // delete already "old" textures, mark "new" entries "old"
+        const TextureCacheMapT::const_iterator aEnd = maCache.end();
+        for( auto aCurr = maCache.begin(); aCurr != aEnd; /* increment managed in loop */)
+        {
+            if( aCurr->second.bOld )
+            {
+                glDeleteTextures( 1, &aCurr->second.nTexture );
+                aCurr = maCache.erase( aCurr );
+            }
+            else
+            {
+                aCurr->second.bOld = true;
+                ++aCurr;
+            }
+        }
+
+        mnMissCount = 0;
+        mnHitCount  = 0;
+    }
+
+    unsigned int TextureCache::getTexture( const geometry::IntegerSize2D& rPixelSize,
+                                           const sal_Int8*                pPixel,
+                                           sal_uInt32                     nPixelCrc32) const
+    {
+        unsigned int nTexture(0);
+
+        // texture already cached?
+        TextureCacheMapT::iterator aCacheEntry;
+        if( (aCacheEntry=maCache.find(nPixelCrc32)) == maCache.end() )
+        {
+            // nope, insert new entry
+            glGenTextures(1, &nTexture);
+            glBindTexture(GL_TEXTURE_2D, nTexture);
+
+            // TODO(E3): handle limited texture sizes -
+            // glGetIntegerv(GL_MAX_TEXTURE_SIZE)
+            glTexImage2D(GL_TEXTURE_2D,
+                         0,
+                         4,
+                         rPixelSize.Width,
+                         rPixelSize.Height,
+                         0,
+                         GL_RGBA,
+                         GL_UNSIGNED_INT_8_8_8_8_REV,
+                         pPixel);
+
+            maCache[nPixelCrc32].nTexture = nTexture;
+            ++mnMissCount;
+
+            return nTexture;
+        }
+        else
+        {
+            nTexture = aCacheEntry->second.nTexture;
+            aCacheEntry->second.bOld = false;
+            ++mnHitCount;
+        }
+
+        return nTexture;
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */