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Diffstat (limited to 'vcl/inc/sallayout.hxx')
| -rw-r--r-- | vcl/inc/sallayout.hxx | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/vcl/inc/sallayout.hxx b/vcl/inc/sallayout.hxx new file mode 100644 index 000000000..e94b4c205 --- /dev/null +++ b/vcl/inc/sallayout.hxx @@ -0,0 +1,226 @@ +/* -*- 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_SALLAYOUT_HXX +#define INCLUDED_VCL_INC_SALLAYOUT_HXX + +#include <iostream> +#include <memory> +#include <vector> + +#include <hb.h> + +#include <com/sun/star/i18n/XBreakIterator.hpp> + +#include <basegfx/polygon/b2dpolypolygon.hxx> +#include <i18nlangtag/languagetag.hxx> +#include <tools/gen.hxx> +#include <vcl/dllapi.h> +#include <vcl/vclenum.hxx> // for typedef sal_UCS4 +#include <vcl/devicecoordinate.hxx> +#include <vcl/vcllayout.hxx> + +#include "impglyphitem.hxx" + +#define MAX_FALLBACK 16 + + +class SalGraphics; +class PhysicalFontFace; +class GenericSalLayout; +enum class SalLayoutFlags; +namespace vcl { + class TextLayoutCache; +} + +// used for managing runs e.g. for BiDi, glyph and script fallback +class ImplLayoutRuns +{ +private: + int mnRunIndex; + std::vector<int> maRuns; + +public: + ImplLayoutRuns() { mnRunIndex = 0; maRuns.reserve(8); } + + void Clear() { maRuns.clear(); } + void AddPos( int nCharPos, bool bRTL ); + void AddRun( int nMinRunPos, int nEndRunPos, bool bRTL ); + + bool IsEmpty() const { return maRuns.empty(); } + void ResetPos() { mnRunIndex = 0; } + void NextRun() { mnRunIndex += 2; } + bool GetRun( int* nMinRunPos, int* nEndRunPos, bool* bRTL ) const; + bool GetNextPos( int* nCharPos, bool* bRTL ); + bool PosIsInRun( int nCharPos ) const; + bool PosIsInAnyRun( int nCharPos ) const; +}; + +class VCL_DLLPUBLIC ImplLayoutArgs +{ +public: + // string related inputs + LanguageTag maLanguageTag; + SalLayoutFlags mnFlags; + const OUString& mrStr; + int mnMinCharPos; + int mnEndCharPos; + + // performance hack + vcl::TextLayoutCache const* m_pTextLayoutCache; + + // positioning related inputs + const DeviceCoordinate* mpDXArray; // in pixel units + DeviceCoordinate mnLayoutWidth; // in pixel units + int mnOrientation; // in 0-3600 system + + // data for bidi and glyph+script fallback + ImplLayoutRuns maRuns; + ImplLayoutRuns maFallbackRuns; + + ImplLayoutArgs( const OUString& rStr, + int nMinCharPos, int nEndCharPos, SalLayoutFlags nFlags, + const LanguageTag& rLanguageTag, + vcl::TextLayoutCache const* pLayoutCache); + + void SetLayoutWidth( DeviceCoordinate nWidth ) { mnLayoutWidth = nWidth; } + void SetDXArray( const DeviceCoordinate* pDXArray ) { mpDXArray = pDXArray; } + void SetOrientation( int nOrientation ) { mnOrientation = nOrientation; } + + void ResetPos() + { maRuns.ResetPos(); } + bool GetNextPos( int* nCharPos, bool* bRTL ) + { return maRuns.GetNextPos( nCharPos, bRTL ); } + bool GetNextRun( int* nMinRunPos, int* nEndRunPos, bool* bRTL ); + void NeedFallback( int nMinRunPos, int nEndRunPos, bool bRTL ) + { maFallbackRuns.AddRun( nMinRunPos, nEndRunPos, bRTL ); } + // methods used by BiDi and glyph fallback + bool NeedFallback() const + { return !maFallbackRuns.IsEmpty(); } + bool PrepareFallback(); + +private: + void AddRun( int nMinCharPos, int nEndCharPos, bool bRTL ); +}; + +// For nice SAL_INFO logging of ImplLayoutArgs values +std::ostream &operator <<(std::ostream& s, ImplLayoutArgs const &rArgs); + +class MultiSalLayout final : public SalLayout +{ +public: + void DrawText(SalGraphics&) const override; + sal_Int32 GetTextBreak(DeviceCoordinate nMaxWidth, DeviceCoordinate nCharExtra, int nFactor) const override; + DeviceCoordinate FillDXArray(DeviceCoordinate* pDXArray) const override; + void GetCaretPositions(int nArraySize, long* pCaretXArray) const override; + bool GetNextGlyph(const GlyphItem** pGlyph, Point& rPos, int& nStart, + const PhysicalFontFace** pFallbackFont = nullptr, + int* const pFallbackLevel = nullptr) const override; + bool GetOutline(basegfx::B2DPolyPolygonVector&) const override; + bool IsKashidaPosValid(int nCharPos) const override; + + // used only by OutputDevice::ImplLayout, TODO: make friend + explicit MultiSalLayout( std::unique_ptr<SalLayout> pBaseLayout ); + void AddFallback(std::unique_ptr<SalLayout> pFallbackLayout, ImplLayoutRuns const &); + bool LayoutText(ImplLayoutArgs&, const SalLayoutGlyphs*) override; + void AdjustLayout(ImplLayoutArgs&) override; + void InitFont() const override; + + void SetIncomplete(bool bIncomplete); + +public: + virtual ~MultiSalLayout() override; + +private: + MultiSalLayout( const MultiSalLayout& ) = delete; + MultiSalLayout& operator=( const MultiSalLayout& ) = delete; + + std::unique_ptr<GenericSalLayout> mpLayouts[ MAX_FALLBACK ]; + ImplLayoutRuns maFallbackRuns[ MAX_FALLBACK ]; + int mnLevel; + bool mbIncomplete; +}; + +class VCL_DLLPUBLIC GenericSalLayout : public SalLayout +{ + friend void MultiSalLayout::AdjustLayout(ImplLayoutArgs&); + +public: + GenericSalLayout(LogicalFontInstance&); + ~GenericSalLayout() override; + + void AdjustLayout(ImplLayoutArgs&) final override; + bool LayoutText(ImplLayoutArgs&, const SalLayoutGlyphs*) final override; + void DrawText(SalGraphics&) const final override; + static std::shared_ptr<vcl::TextLayoutCache> CreateTextLayoutCache(OUString const&); + const SalLayoutGlyphs* GetGlyphs() const final override; + + bool IsKashidaPosValid(int nCharPos) const final override; + + // used by upper layers + DeviceCoordinate GetTextWidth() const final override; + DeviceCoordinate FillDXArray(DeviceCoordinate* pDXArray) const final override; + sal_Int32 GetTextBreak(DeviceCoordinate nMaxWidth, DeviceCoordinate nCharExtra, int nFactor) const final override; + void GetCaretPositions(int nArraySize, long* pCaretXArray) const final override; + + // used by display layers + LogicalFontInstance& GetFont() const + { return m_GlyphItems.Impl()->GetFont(); } + + bool GetNextGlyph(const GlyphItem** pGlyph, Point& rPos, int& nStart, + const PhysicalFontFace** pFallbackFont = nullptr, + int* const pFallbackLevel = nullptr) const override; + +private: + // for glyph+font+script fallback + void MoveGlyph(int nStart, long nNewXPos); + void DropGlyph(int nStart); + void Simplify(bool bIsBase); + + GenericSalLayout( const GenericSalLayout& ) = delete; + GenericSalLayout& operator=( const GenericSalLayout& ) = delete; + + void ApplyDXArray(const ImplLayoutArgs&); + void Justify(DeviceCoordinate nNewWidth); + void ApplyAsianKerning(const OUString& rStr); + + void GetCharWidths(DeviceCoordinate* pCharWidths) const; + + void SetNeedFallback(ImplLayoutArgs&, sal_Int32, bool); + + bool HasVerticalAlternate(sal_UCS4 aChar, sal_UCS4 aNextChar); + + void ParseFeatures(const OUString& name); + + css::uno::Reference<css::i18n::XBreakIterator> mxBreak; + + SalLayoutGlyphs m_GlyphItems; + + OString msLanguage; + std::vector<hb_feature_t> maFeatures; + + hb_set_t* mpVertGlyphs; + const bool mbFuzzing; +}; + +#undef SalGraphics + +#endif // INCLUDED_VCL_INC_SALLAYOUT_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |