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Diffstat (limited to '')
| -rw-r--r-- | vcl/inc/font/LogicalFontInstance.hxx | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/vcl/inc/font/LogicalFontInstance.hxx b/vcl/inc/font/LogicalFontInstance.hxx new file mode 100644 index 0000000000..40d3c57c4e --- /dev/null +++ b/vcl/inc/font/LogicalFontInstance.hxx @@ -0,0 +1,167 @@ +/* -*- 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 <basegfx/polygon/b2dpolypolygon.hxx> +#include <o3tl/hash_combine.hxx> +#include <rtl/ref.hxx> +#include <salhelper/simplereferenceobject.hxx> +#include <tools/gen.hxx> +#include <tools/fontenum.hxx> +#include <tools/degree.hxx> + +#include <font/FontSelectPattern.hxx> +#include <font/FontMetricData.hxx> +#include <glyphid.hxx> + +#include <optional> +#include <unordered_map> + +#include <hb.h> + +class ConvertChar; +class ImplFontCache; + +constexpr float ARTIFICIAL_ITALIC_MATRIX_XX = 1 << 16; +constexpr float ARTIFICIAL_ITALIC_MATRIX_XY = (1 << 16) / 3.f; +constexpr float ARTIFICIAL_ITALIC_SKEW = ARTIFICIAL_ITALIC_MATRIX_XY / ARTIFICIAL_ITALIC_MATRIX_XX; + +// extend std namespace to add custom hash needed for LogicalFontInstance + +namespace std +{ +template <> struct hash<pair<sal_UCS4, FontWeight>> +{ + size_t operator()(const pair<sal_UCS4, FontWeight>& rData) const + { + std::size_t seed = 0; + o3tl::hash_combine(seed, rData.first); + o3tl::hash_combine(seed, rData.second); + return seed; + } +}; +} + +// TODO: allow sharing of metrics for related fonts + +class VCL_PLUGIN_PUBLIC LogicalFontInstance : public salhelper::SimpleReferenceObject +{ + // just declaring the factory function doesn't work AKA + // friend LogicalFontInstance* PhysicalFontFace::CreateFontInstance(const FontSelectPattern&) const; + friend class vcl::font::PhysicalFontFace; + friend class ImplFontCache; + +public: // TODO: make data members private + virtual ~LogicalFontInstance() override; + + FontMetricDataRef mxFontMetric; // Font attributes + const ConvertChar* mpConversion; // used e.g. for StarBats->StarSymbol + + tools::Long mnLineHeight; + Degree10 mnOwnOrientation; // text angle if lower layers don't rotate text themselves + Degree10 mnOrientation; // text angle in 3600 system + bool mbInit; // true if maFontMetric member is valid + + void AddFallbackForUnicode(sal_UCS4 cChar, FontWeight eWeight, const OUString& rFontName, + bool bEmbolden, const ItalicMatrix& rMatrix); + bool GetFallbackForUnicode(sal_UCS4 cInChar, FontWeight eInWeight, OUString* pOutFontName, + bool* pOutEmbolden, ItalicMatrix* pOutItalicMatrix) const; + void IgnoreFallbackForUnicode(sal_UCS4, FontWeight eWeight, std::u16string_view rFontName); + + inline hb_font_t* GetHbFont(); + bool IsGraphiteFont(); + // NeedOffsetCorrection: Return if the font need offset correction in TTB direction. + // nYOffset is the original offset. It is used to check if the correction is necessary. + bool NeedOffsetCorrection(sal_Int32 nYOffset); + void SetAverageWidthFactor(double nFactor) { m_nAveWidthFactor = std::abs(nFactor); } + double GetAverageWidthFactor() const { return m_nAveWidthFactor; } + const vcl::font::FontSelectPattern& GetFontSelectPattern() const { return m_aFontSelData; } + + const vcl::font::PhysicalFontFace* GetFontFace() const { return m_pFontFace.get(); } + vcl::font::PhysicalFontFace* GetFontFace() { return m_pFontFace.get(); } + const ImplFontCache* GetFontCache() const { return mpFontCache; } + + bool GetGlyphBoundRect(sal_GlyphId, tools::Rectangle&, bool) const; + virtual bool GetGlyphOutline(sal_GlyphId, basegfx::B2DPolyPolygon&, bool) const = 0; + basegfx::B2DPolyPolygon GetGlyphOutlineUntransformed(sal_GlyphId) const; + + sal_GlyphId GetGlyphIndex(uint32_t, uint32_t = 0) const; + + double GetGlyphWidth(sal_GlyphId, bool = false, bool = true) const; + + double GetKashidaWidth() const; + + void GetScale(double* nXScale, double* nYScale) const; + + bool NeedsArtificialItalic() const; + bool NeedsArtificialBold() const; + +protected: + explicit LogicalFontInstance(const vcl::font::PhysicalFontFace&, + const vcl::font::FontSelectPattern&); + + hb_font_t* InitHbFont(); + virtual void ImplInitHbFont(hb_font_t*) {} + +private: + hb_font_t* GetHbFontUntransformed() const; + + struct MapEntry + { + OUString sFontName; + bool bEmbolden; + ItalicMatrix aItalicMatrix; + }; + // cache of Unicode characters and replacement font names and attributes + // TODO: a fallback map can be shared with many other ImplFontEntries + // TODO: at least the ones which just differ in orientation, stretching or height + typedef ::std::unordered_map<::std::pair<sal_UCS4, FontWeight>, MapEntry> UnicodeFallbackList; + UnicodeFallbackList maUnicodeFallbackList; + mutable ImplFontCache* mpFontCache; + const vcl::font::FontSelectPattern m_aFontSelData; + hb_font_t* m_pHbFont; + mutable hb_font_t* m_pHbFontUntransformed = nullptr; + double m_nAveWidthFactor; + rtl::Reference<vcl::font::PhysicalFontFace> m_pFontFace; + std::optional<bool> m_xbIsGraphiteFont; + + enum class FontFamilyEnum + { + Unclassified, + DFKaiSB + }; + + // The value is initialized and used in NeedOffsetCorrection(). + std::optional<FontFamilyEnum> m_xeFontFamilyEnum; + + mutable hb_draw_funcs_t* m_pHbDrawFuncs = nullptr; + basegfx::B2DPolygon m_aDrawPolygon; +}; + +inline hb_font_t* LogicalFontInstance::GetHbFont() +{ + if (!m_pHbFont) + m_pHbFont = InitHbFont(); + return m_pHbFont; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |