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/* -*- 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_GRAPHITE_LAYOUT_HXX
#define INCLUDED_VCL_INC_GRAPHITE_LAYOUT_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
#include <memory>
#include <vector>
#include <map>
#include <utility>
#include <graphite_static.hxx>
#include <graphite2/Font.h>
#include <graphite2/Segment.h>
#include <vcl/dllapi.h>
#include "sallayout.hxx"
class ServerFont;
class PhysicalFontFace;
namespace grutils { class GrFeatureParser; }
class GraphiteFaceWrapper
{
public:
typedef std::pair<int, int> GrFontMapKey;
typedef std::map<GrFontMapKey, gr_font*> GrFontMap;
GraphiteFaceWrapper(gr_face * pFace) : m_pFace(pFace) {}
~GraphiteFaceWrapper()
{
GrFontMap::iterator i = m_fonts.begin();
while (i != m_fonts.end())
gr_font_destroy((*i++).second);
m_fonts.clear();
gr_face_destroy(m_pFace);
}
const gr_face * face() const { return m_pFace; }
gr_font * font(int ppm, bool isBold, bool isItalic) const
{
int styleKey = int(isBold) | (int(isItalic) << 1);
GrFontMap::const_iterator i = m_fonts.find(GrFontMapKey(ppm, styleKey));
if (i != m_fonts.end())
return i->second;
return nullptr;
};
void addFont(int ppm, gr_font * pFont, bool isBold, bool isItalic)
{
int styleKey = int(isBold) | (int(isItalic) << 1);
GrFontMapKey key(ppm, styleKey);
if (m_fonts[key])
gr_font_destroy(m_fonts[key]);
m_fonts[key] = pFont;
}
private:
gr_face * m_pFace;
GrFontMap m_fonts;
};
// 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:
typedef std::vector<GlyphItem> Glyphs;
mutable Glyphs mvGlyphs;
void clear();
private:
const gr_face * mpFace; // not owned by layout
gr_font * mpFont; // not owned by layout
unsigned int mnSegCharOffset; // relative to ImplLayoutArgs::mpStr
long mnWidth;
std::vector<int> mvChar2BaseGlyph;
std::vector<int> mvChar2Glyph;
std::vector<int> mvGlyph2Char;
std::vector<int> mvCharDxs;
std::vector<int> mvCharBreaks;
float mfScaling;
const grutils::GrFeatureParser * mpFeatures;
public:
GraphiteLayout(const gr_face * pFace, gr_font * pFont = nullptr,
const grutils::GrFeatureParser * features = nullptr) throw();
// used by upper layers
virtual bool LayoutText( ImplLayoutArgs& ) override; // first step of layout
// split into two stages to allow dc to be restored on the segment
virtual void AdjustLayout( ImplLayoutArgs& ) override; // adjusting positions
// methods using string indexing
virtual sal_Int32 GetTextBreak(DeviceCoordinate nMaxWidth, DeviceCoordinate nCharExtra=0, int nFactor=1) const override;
virtual DeviceCoordinate FillDXArray( DeviceCoordinate* pDXArray ) const override;
void ApplyDXArray(ImplLayoutArgs &rArgs, std::vector<int> & rDeltaWidth);
virtual void GetCaretPositions( int nArraySize, long* pCaretXArray ) const override;
// methods using glyph indexing
virtual int GetNextGlyphs(int nLen, sal_GlyphId* pGlyphIdxAry, ::Point & rPos, int&,
long* pGlyphAdvAry = nullptr, int* pCharPosAry = nullptr,
const PhysicalFontFace** pFallbackFonts = nullptr ) const override;
// used by glyph+font+script fallback
virtual void MoveGlyph( int nStart, long nNewXPos ) override;
virtual void DropGlyph( int nStart ) override;
virtual void Simplify( bool bIsBase ) override;
// Dummy implementation so layout can be shared between Linux/Windows
virtual void DrawText(SalGraphics&) const override {};
virtual ~GraphiteLayout() throw();
void SetFont(gr_font * pFont) { mpFont = pFont; }
#ifdef WNT
gr_font * GetFont() { return mpFont; }
void SetFontScale(float s) { mfScaling = s; };
#endif
void SetFeatures(grutils::GrFeatureParser * aFeature) { mpFeatures = aFeature; }
virtual sal_GlyphId getKashidaGlyph(int & width) = 0;
void kashidaJustify(std::vector<int> & rDeltaWidth, sal_GlyphId, int width);
static const int EXTRA_CONTEXT_LENGTH;
private:
void expandOrCondense(ImplLayoutArgs &rArgs);
void fillFrom(gr_segment * rSeg, ImplLayoutArgs & rArgs, float fScaling, bool bRtl, int firstCharOffset);
float append(gr_segment * pSeg,
ImplLayoutArgs & rArgs,
const gr_slot * pSlot, float gOrigin,
float nextGlyphOrigin, float fScaling,
long & rDXOffset, bool bIsBase, int baseChar, int baseGlyph, bool bRtl);
unsigned int ScanFwdForChar(int &findChar, bool fallback) const;
};
#endif // INCLUDED_VCL_INC_GRAPHITE_LAYOUT_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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