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Diffstat (limited to 'vcl/source/font/fontcache.cxx')
| -rw-r--r-- | vcl/source/font/fontcache.cxx | 279 |
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 index 000000000..9a87d02bc --- /dev/null +++ b/vcl/source/font/fontcache.cxx @@ -0,0 +1,279 @@ +/* -*- 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: */ |