1 files changed, 279 insertions, 0 deletions
diff --git a/vcl/source/font/fontcache.cxx b/vcl/source/font/fontcache.cxx
new file mode 100644
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+++ b/vcl/source/font/fontcache.cxx
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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 .
+ */
+
+#include <sal/config.h>
+
+#include <sal/log.hxx>
+
+#include <font/PhysicalFontCollection.hxx>
+#include <font/PhysicalFontFace.hxx>
+#include <font/PhysicalFontFamily.hxx>
+#include <fontinstance.hxx>
+#include <impfontcache.hxx>
+
+using namespace vcl::font;
+
+size_t ImplFontCache::IFSD_Hash::operator()( const vcl::font::FontSelectPattern& rFSD ) const
+{
+    return rFSD.hashCode();
+}
+
+bool ImplFontCache::IFSD_Equal::operator()(const vcl::font::FontSelectPattern& rA, const vcl::font::FontSelectPattern& rB) const
+{
+    // check normalized font family name
+    if( rA.maSearchName != rB.maSearchName )
+        return false;
+
+    // check font transformation
+    if( (rA.mnHeight       != rB.mnHeight)
+    ||  (rA.mnWidth        != rB.mnWidth)
+    ||  (rA.mnOrientation  != rB.mnOrientation) )
+        return false;
+
+    // check mapping relevant attributes
+    if( (rA.mbVertical     != rB.mbVertical)
+    ||  (rA.meLanguage     != rB.meLanguage) )
+        return false;
+
+    // check font face attributes
+    if( (rA.GetWeight()    != rB.GetWeight())
+    ||  (rA.GetItalic()    != rB.GetItalic())
+//  ||  (rA.meFamily       != rB.meFamily) // TODO: remove this mostly obsolete member
+    ||  (rA.GetPitch()     != rB.GetPitch()) )
+        return false;
+
+    // check style name
+    if( rA.GetStyleName() != rB.GetStyleName() )
+        return false;
+
+    // Symbol fonts may recode from one type to another So they are only
+    // safely equivalent for equal targets
+    if (rA.IsSymbolFont() || rB.IsSymbolFont())
+    {
+        if (rA.maTargetName != rB.maTargetName)
+            return false;
+    }
+
+    // check for features
+    if ((rA.maTargetName.indexOf(vcl::font::FontSelectPattern::FEAT_PREFIX)
+         != -1 ||
+         rB.maTargetName.indexOf(vcl::font::FontSelectPattern::FEAT_PREFIX)
+         != -1) && rA.maTargetName != rB.maTargetName)
+        return false;
+
+    if (rA.mbEmbolden != rB.mbEmbolden)
+        return false;
+
+    if (rA.maItalicMatrix != rB.maItalicMatrix)
+        return false;
+
+    return true;
+}
+
+ImplFontCache::ImplFontCache()
+    : mpLastHitCacheEntry( nullptr )
+    , maFontInstanceList(std::numeric_limits<size_t>::max()) // "unlimited", i.e. no cleanup
+    // The cache limit is set by the rough number of characters needed to read your average Asian newspaper.
+    , m_aBoundRectCache(3000)
+{}
+
+ImplFontCache::~ImplFontCache()
+{
+    for (const auto & rLFI : maFontInstanceList)
+    {
+        rLFI.second->mpFontCache = nullptr;
+    }
+}
+
+rtl::Reference<LogicalFontInstance> ImplFontCache::GetFontInstance( PhysicalFontCollection const * pFontList,
+    const vcl::Font& rFont, const Size& rSize, float fExactHeight, bool bNonAntialias )
+{
+    // initialize internal font request object
+    vcl::font::FontSelectPattern aFontSelData(rFont, rFont.GetFamilyName(), rSize, fExactHeight, bNonAntialias);
+    return GetFontInstance( pFontList, aFontSelData );
+}
+
+rtl::Reference<LogicalFontInstance> ImplFontCache::GetFontInstance( PhysicalFontCollection const * pFontList,
+    vcl::font::FontSelectPattern& aFontSelData )
+{
+    rtl::Reference<LogicalFontInstance> pFontInstance;
+    PhysicalFontFamily* pFontFamily = nullptr;
+
+    // check if a directly matching logical font instance is already cached,
+    // the most recently used font usually has a hit rate of >50%
+    if (mpLastHitCacheEntry && IFSD_Equal()(aFontSelData, mpLastHitCacheEntry->GetFontSelectPattern()))
+        pFontInstance = mpLastHitCacheEntry;
+    else
+    {
+        FontInstanceList::const_iterator it = maFontInstanceList.find( aFontSelData );
+        if( it != maFontInstanceList.end() )
+            pFontInstance = (*it).second;
+    }
+
+    if( !pFontInstance ) // no direct cache hit
+    {
+        // find the best matching logical font family and update font selector accordingly
+        pFontFamily = pFontList->FindFontFamily( aFontSelData );
+        SAL_WARN_IF( (pFontFamily == nullptr), "vcl", "ImplFontCache::Get() No logical font found!" );
+        if( pFontFamily )
+        {
+            aFontSelData.maSearchName = pFontFamily->GetSearchName();
+
+            // check if an indirectly matching logical font instance is already cached
+            FontInstanceList::const_iterator it = maFontInstanceList.find( aFontSelData );
+            if( it != maFontInstanceList.end() )
+                pFontInstance = (*it).second;
+        }
+    }
+
+    if( !pFontInstance && pFontFamily) // still no cache hit => create a new font instance
+    {
+        vcl::font::PhysicalFontFace* pFontData = pFontFamily->FindBestFontFace(aFontSelData);
+
+        // create a new logical font instance from this physical font face
+        pFontInstance = pFontData->CreateFontInstance( aFontSelData );
+        pFontInstance->mpFontCache = this;
+
+        // if we're substituting from or to a symbol font we may need a symbol
+        // conversion table
+        if( pFontData->IsSymbolFont() || aFontSelData.IsSymbolFont() )
+        {
+            if( aFontSelData.maTargetName != aFontSelData.maSearchName )
+                pFontInstance->mpConversion = ConvertChar::GetRecodeData( aFontSelData.maTargetName, aFontSelData.maSearchName );
+        }
+
+#ifdef MACOSX
+        //It might be better to dig out the font version of the target font
+        //to see if it's a modern re-coded apple symbol font in case that
+        //font shows up on a different platform
+        if (!pFontInstance->mpConversion &&
+            aFontSelData.maTargetName.equalsIgnoreAsciiCase("symbol") &&
+            aFontSelData.maSearchName.equalsIgnoreAsciiCase("symbol"))
+        {
+            pFontInstance->mpConversion = ConvertChar::GetRecodeData( u"Symbol", u"AppleSymbol" );
+        }
+#endif
+
+        static const size_t FONTCACHE_MAX = getenv("LO_TESTNAME") ? 1 : 50;
+
+        if (maFontInstanceList.size() >= FONTCACHE_MAX)
+        {
+            struct limit_exception : public std::exception {};
+            try
+            {
+                maFontInstanceList.remove_if([this] (FontInstanceList::key_value_pair_t const& rFontPair)
+                    {
+                        if (maFontInstanceList.size() < FONTCACHE_MAX)
+                            throw limit_exception();
+                        LogicalFontInstance* pFontEntry = rFontPair.second.get();
+                        if (pFontEntry->m_nCount > 1)
+                            return false;
+                        m_aBoundRectCache.remove_if([&pFontEntry] (GlyphBoundRectCache::key_value_pair_t const& rGlyphPair)
+                            { return rGlyphPair.first.m_pFont == pFontEntry; });
+                        if (mpLastHitCacheEntry == pFontEntry)
+                            mpLastHitCacheEntry = nullptr;
+                        return true;
+                    });
+            }
+            catch (limit_exception&) {}
+        }
+
+        assert(pFontInstance);
+        // add the new entry to the cache
+        maFontInstanceList.insert({aFontSelData, pFontInstance.get()});
+    }
+
+    mpLastHitCacheEntry = pFontInstance.get();
+    return pFontInstance;
+}
+
+rtl::Reference<LogicalFontInstance> ImplFontCache::GetGlyphFallbackFont( PhysicalFontCollection const * pFontCollection,
+    vcl::font::FontSelectPattern& rFontSelData, LogicalFontInstance* pFontInstance, int nFallbackLevel, OUString& rMissingCodes )
+{
+    // get a candidate font for glyph fallback
+    // unless the previously selected font got a device specific substitution
+    // e.g. PsPrint Arial->Helvetica for udiaeresis when Helvetica doesn't support it
+    if( nFallbackLevel >= 1)
+    {
+        PhysicalFontFamily* pFallbackData = nullptr;
+
+        //fdo#33898 If someone has EUDC installed then they really want that to
+        //be used as the first-choice glyph fallback seeing as it's filled with
+        //private area codes with don't make any sense in any other font so
+        //prioritize it here if it's available. Ideally we would remove from
+        //rMissingCodes all the glyphs which it is able to resolve as an
+        //optimization, but that's tricky to achieve cross-platform without
+        //sufficient heavy-weight code that's likely to undo the value of the
+        //optimization
+        if (nFallbackLevel == 1)
+            pFallbackData = pFontCollection->FindFontFamily(u"EUDC");
+        if (!pFallbackData)
+            pFallbackData = pFontCollection->GetGlyphFallbackFont(rFontSelData, pFontInstance, rMissingCodes, nFallbackLevel-1);
+        // escape when there are no font candidates
+        if( !pFallbackData  )
+            return nullptr;
+        // override the font name
+        rFontSelData.SetFamilyName( pFallbackData->GetFamilyName() );
+        // clear the cached normalized name
+        rFontSelData.maSearchName.clear();
+    }
+
+    rtl::Reference<LogicalFontInstance> pFallbackFont = GetFontInstance( pFontCollection, rFontSelData );
+    return pFallbackFont;
+}
+
+void ImplFontCache::Invalidate()
+{
+    // #112304# make sure the font cache is really clean
+    mpLastHitCacheEntry = nullptr;
+    for (auto const & pair : maFontInstanceList)
+        pair.second->mpFontCache = nullptr;
+    maFontInstanceList.clear();
+    m_aBoundRectCache.clear();
+}
+
+bool ImplFontCache::GetCachedGlyphBoundRect(const LogicalFontInstance *pFont, sal_GlyphId nID, tools::Rectangle &rRect)
+{
+    if (!pFont->GetFontCache())
+        return false;
+    assert(pFont->GetFontCache() == this);
+    if (pFont->GetFontCache() != this)
+        return false;
+
+    auto it = m_aBoundRectCache.find({pFont, nID});
+    if (it != m_aBoundRectCache.end())
+    {
+        rRect = it->second;
+        return true;
+    }
+    return false;
+}
+
+void ImplFontCache::CacheGlyphBoundRect(const LogicalFontInstance *pFont, sal_GlyphId nID, tools::Rectangle &rRect)
+{
+    if (!pFont->GetFontCache())
+        return;
+    assert(pFont->GetFontCache() == this);
+    if (pFont->GetFontCache() != this)
+        return;
+
+    m_aBoundRectCache.insert({{pFont, nID}, rRect});
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */