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office-gobmx/vcl/inc/sallayout.hxx
Noel Grandin d86d782997 loplugin:constantparam 
Change-Id: I8961b5df1b3a7ea9b7dd83114fce1555b9e4ffcc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/94787
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
2020-05-25 16:03:11 +02:00

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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_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) 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) 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: */
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