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/**************************************************************
*
* 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
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the 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_PLUGIN_PUBLIC 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:
explicit 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
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