vcl: move ImplFontCache into own private header

Change-Id: Ic4444f54fabe03319de9add93653f6b7c91d6fce

1 files changed, 68 insertions, 0 deletions

diff --git a/vcl/inc/impfontcache.hxx b/vcl/inc/impfontcache.hxx
new file mode 100644
index 000000000000..8dc10ddecb02
--- /dev/null
+++ b/vcl/inc/impfontcache.hxx
@@ -0,0 +1,68 @@
+/* -*- 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_INC_IMPFONTCACHE_HXX
+#define INCLUDED_VCL_INC_IMPFONTCACHE_HXX
+
+#include <unordered_map>
+
+#include "fontselect.hxx"
+
+class Size;
+namespace vcl { class Font; }
+class PhysicalFontCollection;
+
+
+// TODO: closely couple with PhysicalFontCollection
+
+class ImplFontCache
+{
+private:
+    LogicalFontInstance* mpFirstEntry;
+    int                  mnRef0Count;    // number of unreferenced LogicalFontInstances
+
+    // cache of recently used font instances
+    struct IFSD_Equal { bool operator()( const FontSelectPattern&, const FontSelectPattern& ) const; };
+    struct IFSD_Hash { size_t operator()( const FontSelectPattern& ) const; };
+    typedef std::unordered_map<FontSelectPattern,LogicalFontInstance*,IFSD_Hash,IFSD_Equal > FontInstanceList;
+    FontInstanceList    maFontInstanceList;
+
+    int                 CountUnreferencedEntries() const;
+
+public:
+                        ImplFontCache();
+                        ~ImplFontCache();
+
+    LogicalFontInstance* GetFontInstance( PhysicalFontCollection*,
+                             const vcl::Font&, const Size& rPixelSize, float fExactHeight);
+    LogicalFontInstance* GetFontInstance( PhysicalFontCollection*, FontSelectPattern& );
+    LogicalFontInstance* GetGlyphFallbackFont( PhysicalFontCollection*, FontSelectPattern&,
+                            int nFallbackLevel, OUString& rMissingCodes );
+
+    /// Increase the refcount of the given LogicalFontInstance.
+    void                Acquire(LogicalFontInstance*);
+    /// Decrease the refcount and potentially cleanup the entries with zero refcount from the cache.
+    void                Release(LogicalFontInstance*);
+
+    void                Invalidate();
+};
+
+#endif // INCLUDED_VCL_INC_IMPFONTCACHE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */