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Diffstat (limited to 'vcl/inc/graphite_layout.hxx')
| -rw-r--r-- | vcl/inc/graphite_layout.hxx | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/vcl/inc/graphite_layout.hxx b/vcl/inc/graphite_layout.hxx new file mode 100644 index 000000000000..bbeaf21ecd60 --- /dev/null +++ b/vcl/inc/graphite_layout.hxx @@ -0,0 +1,188 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#ifndef _SV_GRAPHITELAYOUT_HXX +#define _SV_GRAPHITELAYOUT_HXX +// Description: An implementation of the SalLayout interface that uses the +// Graphite engine. + +// We need this to enable namespace support in libgrengine headers. +#define GR_NAMESPACE + +#define GRCACHE 1 + +// Standard Library +#include <memory> +#include <vector> +#include <utility> +// Libraries +#include <preextstl.h> +#include <graphite/GrClient.h> +#include <graphite/Font.h> +#include <graphite/GrConstants.h> +#include <graphite/GrAppData.h> +#include <graphite/SegmentAux.h> +#include <postextstl.h> +// Platform +#include <sallayout.hxx> +#include <vcl/dllapi.h> +// Module + +// For backwards compatibility with 2.4.x +#if (SUPD == 680) +typedef sal_Int32 sal_GlyphId; +#endif + + +// Module type definitions and forward declarations. +// +class TextSourceAdaptor; +class GraphiteFontAdaptor; +class GrSegRecord; +// SAL/VCL types +class ServerFont; + +#ifdef WNT +// The GraphiteWinFont is just a wrapper to enable GrFontHasher to be a friend +// so that UniqueCacheInfo can be called. +#include <graphite/WinFont.h> +class GraphiteWinFont : public gr::WinFont +{ + friend class GrFontHasher; +public: + GraphiteWinFont(HDC hdc) : gr::WinFont(hdc) {}; + virtual ~GraphiteWinFont() {}; +}; +#endif +// Graphite types +namespace gr { class Segment; class GlyphIterator; } +namespace grutils { class GrFeatureParser; } + +// This class uses the SIL Graphite engine to provide complex text layout services to the VCL +// @author tse +// +class VCL_DLLPUBLIC GraphiteLayout : public SalLayout +{ +public: + // Mask to allow Word break status to be stored within mvChar2BaseGlyph + enum { + WORD_BREAK_BEFORE = 0x40000000, + HYPHEN_BREAK_BEFORE = 0x80000000, + BREAK_MASK = 0xC0000000, + GLYPH_INDEX_MASK = 0x3FFFFFFF + } LineBreakMask; + + class Glyphs : public std::vector<GlyphItem> + { + public: + typedef std::pair<Glyphs::const_iterator, Glyphs::const_iterator> iterator_pair_t; + + void fill_from(gr::Segment & rSeg, ImplLayoutArgs & rArgs, + bool bRtl, long &rWidth, float fScaling, + std::vector<int> & rChar2Base, std::vector<int> & rGlyph2Char, + std::vector<int> & rCharDxs); + void move_glyph(Glyphs::iterator, long dx); + + const_iterator cluster_base(const_iterator) const; + iterator_pair_t neighbour_clusters(const_iterator) const; + private: + std::pair<float,float> appendCluster(gr::Segment & rSeg, ImplLayoutArgs & rArgs, + bool bRtl, float fSegmentAdvance, int nFirstCharInCluster, int nNextChar, + int nFirstGlyphInCluster, int nNextGlyph, float fScaling, + std::vector<int> & rChar2Base, std::vector<int> & rGlyph2Char, + std::vector<int> & rCharDxs, long & rDXOffset); + void append(gr::Segment & rSeg, ImplLayoutArgs & rArgs, gr::GlyphInfo & rGi, float nextGlyphOrigin, float fScaling, std::vector<int> & rChar2Base, std::vector<int> & rGlyph2Char, std::vector<int> & rCharDxs, long & rDXOffset, bool bIsBase); + }; + + mutable Glyphs mvGlyphs; + void clear(); + +private: + TextSourceAdaptor * mpTextSrc; // Text source. + gr::LayoutEnvironment maLayout; + const gr::Font &mrFont; + long mnWidth; + std::vector<int> mvCharDxs; + std::vector<int> mvChar2BaseGlyph; + std::vector<int> mvGlyph2Char; + float mfScaling; + const grutils::GrFeatureParser * mpFeatures; + +public: + GraphiteLayout(const gr::Font & font, const grutils::GrFeatureParser * features = NULL) throw(); + + // used by upper layers + virtual bool LayoutText( ImplLayoutArgs& ); // first step of layout + // split into two stages to allow dc to be restored on the segment +#ifdef GRCACHE + gr::Segment * CreateSegment(ImplLayoutArgs& rArgs, GrSegRecord ** pRecord = NULL); + bool LayoutGlyphs(ImplLayoutArgs& rArgs, gr::Segment * pSegment, GrSegRecord * pSegRecord); +#else + gr::Segment * CreateSegment(ImplLayoutArgs& rArgs); + bool LayoutGlyphs(ImplLayoutArgs& rArgs, gr::Segment * pSegment); +#endif + + virtual void AdjustLayout( ImplLayoutArgs& ); // adjusting positions + + // methods using string indexing + virtual int GetTextBreak( long nMaxWidth, long nCharExtra=0, int nFactor=1 ) const; + virtual long FillDXArray( sal_Int32* pDXArray ) const; + virtual void ApplyDXArray(ImplLayoutArgs &rArgs, std::vector<int> & rDeltaWidth); + + virtual void GetCaretPositions( int nArraySize, sal_Int32* pCaretXArray ) const; + + // methods using glyph indexing + virtual int GetNextGlyphs(int nLen, sal_GlyphId* pGlyphIdxAry, ::Point & rPos, int&, + sal_Int32* pGlyphAdvAry = 0, int* pCharPosAry = 0 ) const; + + // used by glyph+font+script fallback + virtual void MoveGlyph( int nStart, long nNewXPos ); + virtual void DropGlyph( int nStart ); + virtual void Simplify( bool bIsBase ); + + // Dummy implementation so layout can be shared between Linux/Windows + virtual void DrawText(SalGraphics&) const {}; + + virtual ~GraphiteLayout() throw(); + void SetFeatures(grutils::GrFeatureParser * aFeature) { mpFeatures = aFeature; } + void SetFontScale(float s) { mfScaling = s; }; + const TextSourceAdaptor * textSrc() const { return mpTextSrc; }; + virtual sal_GlyphId getKashidaGlyph(int & width) = 0; + void kashidaJustify(std::vector<int> & rDeltaWidth, sal_GlyphId, int width); + + static const int EXTRA_CONTEXT_LENGTH; +private: + int glyph_to_char(Glyphs::iterator); + std::pair<int,int> glyph_to_chars(const GlyphItem &) const; + + std::pair<long,long> caret_positions(size_t) const; + void expandOrCondense(ImplLayoutArgs &rArgs); +}; + + + +#endif // _SV_GRAPHITELAYOUT_HXX |