1 files changed, 95 insertions, 0 deletions
diff --git a/vcl/inc/impfontcache.hxx b/vcl/inc/impfontcache.hxx
new file mode 100644
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+++ b/vcl/inc/impfontcache.hxx
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+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <rtl/ref.hxx>
+#include <o3tl/lru_map.hxx>
+#include <o3tl/hash_combine.hxx>
+#include <tools/gen.hxx>
+
+#include "font/FontSelectPattern.hxx"
+#include "glyphid.hxx"
+
+class Size;
+namespace vcl { class Font; }
+namespace vcl::font { class PhysicalFontCollection; }
+
+// TODO: closely couple with PhysicalFontCollection
+
+struct GlyphBoundRectCacheKey
+{
+    const LogicalFontInstance* m_pFont;
+    const sal_GlyphId m_nId;
+
+    GlyphBoundRectCacheKey(const LogicalFontInstance* pFont, sal_GlyphId nID)
+        : m_pFont(pFont), m_nId(nID)
+    {}
+
+    bool operator==(GlyphBoundRectCacheKey const& aOther) const
+    { return m_pFont == aOther.m_pFont && m_nId == aOther.m_nId; }
+};
+
+struct GlyphBoundRectCacheHash
+{
+    std::size_t operator()(GlyphBoundRectCacheKey const& aCache) const
+    {
+        std::size_t seed = 0;
+        o3tl::hash_combine(seed, aCache.m_pFont);
+        o3tl::hash_combine(seed, aCache.m_nId);
+        return seed;
+    }
+};
+
+typedef o3tl::lru_map<GlyphBoundRectCacheKey, tools::Rectangle,
+                      GlyphBoundRectCacheHash> GlyphBoundRectCache;
+
+class ImplFontCache
+{
+private:
+    // cache of recently used font instances
+    struct IFSD_Equal { bool operator()( const vcl::font::FontSelectPattern&, const vcl::font::FontSelectPattern& ) const; };
+    struct IFSD_Hash { size_t operator()( const vcl::font::FontSelectPattern& ) const; };
+    typedef o3tl::lru_map<vcl::font::FontSelectPattern, rtl::Reference<LogicalFontInstance>, IFSD_Hash, IFSD_Equal> FontInstanceList;
+
+    LogicalFontInstance* mpLastHitCacheEntry; ///< keeps the last hit cache entry
+    FontInstanceList maFontInstanceList;
+    GlyphBoundRectCache m_aBoundRectCache;
+
+    rtl::Reference<LogicalFontInstance> GetFontInstance(vcl::font::PhysicalFontCollection const*, vcl::font::FontSelectPattern&);
+
+public:
+    ImplFontCache();
+    ~ImplFontCache();
+
+    rtl::Reference<LogicalFontInstance> GetFontInstance(vcl::font::PhysicalFontCollection const *,
+                             const vcl::Font&, const Size& rPixelSize, float fExactHeight, bool bNonAntialias = false);
+    rtl::Reference<LogicalFontInstance> GetGlyphFallbackFont( vcl::font::PhysicalFontCollection const *, vcl::font::FontSelectPattern&,
+                            LogicalFontInstance* pLogicalFont,
+                            int nFallbackLevel, OUString& rMissingCodes );
+
+    bool GetCachedGlyphBoundRect(const LogicalFontInstance *, sal_GlyphId, tools::Rectangle &);
+    void CacheGlyphBoundRect(const LogicalFontInstance *, sal_GlyphId, tools::Rectangle &);
+
+    void                Invalidate();
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */