vcl/inc/ImplLayoutRuns.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #pragma once
  21
  22 #include <vcl/dllapi.h>
  23 #include <boost/container/small_vector.hpp>
  24
  25 // used for managing runs e.g. for BiDi, glyph and script fallback
  26 class VCL_DLLPUBLIC ImplLayoutRuns
  27 {
  28 public:
  29     struct Run
  30     {
  31         int m_nMinRunPos;
  32         int m_nEndRunPos;
  33         bool m_bRTL;
  34
  35         Run(int nMinRunPos, int nEndRunPos, bool bRTL)
  36             : m_nMinRunPos(nMinRunPos)
  37             , m_nEndRunPos(nEndRunPos)
  38             , m_bRTL(bRTL)
  39         {
  40         }
  41
  42         inline bool Contains(int nCharPos) const
  43         {
  44             return (m_nMinRunPos <= nCharPos) && (nCharPos < m_nEndRunPos);
  45         }
  46
  47         bool operator==(const Run&) const = default;
  48     };
  49
  50 private:
  51     int mnRunIndex;
  52     boost::container::small_vector<Run, 8> maRuns;
  53
  54 public:
  55     ImplLayoutRuns() { mnRunIndex = 0; }
  56
  57     void Clear() { maRuns.clear(); }
  58     void AddPos(int nCharPos, bool bRTL);
  59     void AddRun(int nMinRunPos, int nEndRunPos, bool bRTL);
  60
  61     void Normalize();
  62     void ReverseTail(size_t nTailIndex);
  63
  64     bool IsEmpty() const { return maRuns.empty(); }
  65     void ResetPos() { mnRunIndex = 0; }
  66     void NextRun() { ++mnRunIndex; }
  67     bool GetRun(int* nMinRunPos, int* nEndRunPos, bool* bRTL) const;
  68     bool GetNextPos(int* nCharPos, bool* bRTL);
  69     bool PosIsInRun(int nCharPos) const;
  70     bool PosIsInAnyRun(int nCharPos) const;
  71
  72     inline auto begin() const { return maRuns.begin(); }
  73     inline auto end() const { return maRuns.end(); }
  74     inline const auto& at(size_t nIndex) const { return maRuns.at(nIndex); }
  75     inline auto size() const { return maRuns.size(); }
  76
  77     static void PrepareFallbackRuns(ImplLayoutRuns* paRuns, ImplLayoutRuns* paFallbackRuns);
  78 };
  79
  80 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */