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diff --git a/gfx/graphite2/src/inc/SegCacheEntry.h b/gfx/graphite2/src/inc/SegCacheEntry.h
new file mode 100644
index 000000000..9a7d93067
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+++ b/gfx/graphite2/src/inc/SegCacheEntry.h
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+/*  GRAPHITE2 LICENSING
+
+    Copyright 2010, SIL International
+    All rights reserved.
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published
+    by the Free Software Foundation; either version 2.1 of License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should also have received a copy of the GNU Lesser General Public
+    License along with this library in the file named "LICENSE".
+    If not, write to the Free Software Foundation, 51 Franklin Street,
+    Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+    internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+#pragma once
+
+#ifndef GRAPHITE2_NSEGCACHE
+
+#include "inc/Main.h"
+#include "inc/Slot.h"
+
+namespace graphite2 {
+
+class Segment;
+class Slot;
+class SegCacheEntry;
+class SegCachePrefixEntry;
+
+enum SegCacheParameters {
+    /** number of characters used in initial prefix tree */
+    ePrefixLength = 2,
+    /** Segments more recent than maxSegmentCount() / eAgeFactor are kept */
+    eAgeFactor = 4,
+    /** Segments are purged according to the formular:
+     * accessCount < (totalAccesses)/(ePurgeFactor * maxSegments) */
+    ePurgeFactor = 5,
+    /** Maximum number of Segments to store which have the same
+     * prefix. Needed to prevent unique identifiers flooding the cache */
+    eMaxSuffixCount = 15
+
+};
+
+class SegCacheCharInfo
+{
+public:
+    uint16 m_unicode;
+    uint16 m_before;
+    uint16 m_after;
+};
+
+/**
+ * SegCacheEntry stores the result of running the engine for specific unicode
+ * code points in the typical mid-line situation.
+ */
+class SegCacheEntry
+{
+    // Prevent any implict copying;
+    SegCacheEntry(const SegCacheEntry &);
+    SegCacheEntry & operator = (const SegCacheEntry &);
+
+    friend class SegCachePrefixEntry;
+public:
+    SegCacheEntry() :
+        m_glyphLength(0), m_unicode(NULL), m_glyph(NULL), m_attr(NULL), m_justs(0),
+        m_accessCount(0), m_lastAccess(0)
+    {}
+    SegCacheEntry(const uint16 * cmapGlyphs, size_t length, Segment * seg, size_t charOffset, long long cacheTime);
+    ~SegCacheEntry() { clear(); };
+    void clear();
+    size_t glyphLength() const { return m_glyphLength; }
+    const Slot * first() const { return m_glyph; }
+    const Slot * last() const { return m_glyph + (m_glyphLength - 1); }
+
+    /** Total number of times this entry has been accessed since creation */
+    unsigned long long accessCount() const { return m_accessCount; }
+    /** "time" of last access where "time" is measured in accesses to the cache owning this entry */
+    void accessed(unsigned long long cacheTime) const
+    {
+        m_lastAccess = cacheTime; ++m_accessCount;
+    };
+
+    int compareRank(const SegCacheEntry & entry) const
+    {
+        if (m_accessCount > entry.m_accessCount) return 1;
+        else if (m_accessCount < entry.m_accessCount) return 1;
+        else if (m_lastAccess > entry.m_lastAccess) return 1;
+        else if (m_lastAccess < entry.m_lastAccess) return -1;
+        return 0;
+    }
+    unsigned long long lastAccess() const { return m_lastAccess; };
+
+    CLASS_NEW_DELETE;
+private:
+
+    size_t   m_glyphLength;
+    /** glyph ids resulting from cmap mapping from unicode to glyph before substitution
+     * the length of this array is determined by the position in the SegCachePrefixEntry */
+    uint16 * m_unicode;
+    /** slots after shapping and positioning */
+    Slot   * m_glyph;
+    int16  * m_attr;
+    byte   * m_justs;
+    mutable unsigned long long m_accessCount;
+    mutable unsigned long long m_lastAccess;
+};
+
+} // namespace graphite2
+
+#endif