Rename text break files to match class names.

This CL renames several fgas/layout files to match the class names
contained in the files.

Change-Id: Ib4feaa902618e577261e51dbac743cb4cb500ea1
Reviewed-on: https://pdfium-review.googlesource.com/4290
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>

1 files changed, 790 insertions, 0 deletions

diff --git a/xfa/fgas/layout/cfx_rtfbreak.cpp b/xfa/fgas/layout/cfx_rtfbreak.cpp
new file mode 100644
index 0000000000..9acc082d8e
--- /dev/null
+++ b/xfa/fgas/layout/cfx_rtfbreak.cpp
@@ -0,0 +1,790 @@
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "xfa/fgas/layout/cfx_rtfbreak.h"
+
+#include <algorithm>
+
+#include "core/fxcrt/fx_arabic.h"
+#include "third_party/base/stl_util.h"
+#include "xfa/fgas/font/cfgas_gefont.h"
+#include "xfa/fgas/layout/cfx_linebreak.h"
+
+CFX_RTFBreak::CFX_RTFBreak(uint32_t dwLayoutStyles)
+    : CFX_Break(dwLayoutStyles),
+      m_bPagination(false),
+      m_iAlignment(CFX_RTFLineAlignment::Left),
+      m_pUserData(nullptr) {
+  SetBreakStatus();
+  m_bPagination = !!(m_dwLayoutStyles & FX_LAYOUTSTYLE_Pagination);
+}
+
+CFX_RTFBreak::~CFX_RTFBreak() {}
+
+void CFX_RTFBreak::SetLineStartPos(float fLinePos) {
+  int32_t iLinePos = FXSYS_round(fLinePos * 20000.0f);
+  iLinePos = std::min(iLinePos, m_iLineWidth);
+  iLinePos = std::max(iLinePos, m_iLineStart);
+  m_pCurLine->m_iStart = iLinePos;
+}
+
+void CFX_RTFBreak::AddPositionedTab(float fTabPos) {
+  int32_t iTabPos =
+      std::min(FXSYS_round(fTabPos * 20000.0f) + m_iLineStart, m_iLineWidth);
+  auto it = std::lower_bound(m_PositionedTabs.begin(), m_PositionedTabs.end(),
+                             iTabPos);
+  if (it != m_PositionedTabs.end() && *it == iTabPos)
+    return;
+  m_PositionedTabs.insert(it, iTabPos);
+}
+
+void CFX_RTFBreak::SetUserData(const CFX_RetainPtr<CFX_Retainable>& pUserData) {
+  if (m_pUserData == pUserData)
+    return;
+
+  SetBreakStatus();
+  m_pUserData = pUserData;
+}
+
+int32_t CFX_RTFBreak::GetLastPositionedTab() const {
+  return m_PositionedTabs.empty() ? m_iLineStart : m_PositionedTabs.back();
+}
+
+bool CFX_RTFBreak::GetPositionedTab(int32_t* iTabPos) const {
+  auto it = std::upper_bound(m_PositionedTabs.begin(), m_PositionedTabs.end(),
+                             *iTabPos);
+  if (it == m_PositionedTabs.end())
+    return false;
+
+  *iTabPos = *it;
+  return true;
+}
+
+CFX_BreakType CFX_RTFBreak::AppendChar(wchar_t wch) {
+  ASSERT(m_pFont && m_pCurLine);
+
+  uint32_t dwProps = kTextLayoutCodeProperties[static_cast<uint16_t>(wch)];
+  FX_CHARTYPE chartype = GetCharTypeFromProp(dwProps);
+  m_pCurLine->m_LineChars.emplace_back();
+
+  CFX_Char* pCurChar = &m_pCurLine->m_LineChars.back();
+  pCurChar->m_dwStatus = CFX_BreakType::None;
+  pCurChar->m_wCharCode = wch;
+  pCurChar->m_dwCharProps = dwProps;
+  pCurChar->m_iFontSize = m_iFontSize;
+  pCurChar->m_iHorizontalScale = m_iHorizontalScale;
+  pCurChar->m_iVerticalScale = m_iVerticalScale;
+  pCurChar->m_iCharWidth = 0;
+  pCurChar->m_dwIdentity = m_dwIdentity;
+  pCurChar->m_pUserData = m_pUserData;
+
+  CFX_BreakType dwRet1 = CFX_BreakType::None;
+  if (chartype != FX_CHARTYPE_Combination &&
+      GetUnifiedCharType(m_eCharType) != GetUnifiedCharType(chartype) &&
+      m_eCharType != FX_CHARTYPE_Unknown &&
+      m_pCurLine->GetLineEnd() > m_iLineWidth + m_iTolerance &&
+      (m_eCharType != FX_CHARTYPE_Space || chartype != FX_CHARTYPE_Control)) {
+    dwRet1 = EndBreak(CFX_BreakType::Line);
+    int32_t iCount = m_pCurLine->CountChars();
+    if (iCount > 0)
+      pCurChar = &m_pCurLine->m_LineChars[iCount - 1];
+  }
+
+  CFX_BreakType dwRet2 = CFX_BreakType::None;
+  switch (chartype) {
+    case FX_CHARTYPE_Tab:
+      AppendChar_Tab(pCurChar);
+      break;
+    case FX_CHARTYPE_Control:
+      dwRet2 = AppendChar_Control(pCurChar);
+      break;
+    case FX_CHARTYPE_Combination:
+      AppendChar_Combination(pCurChar);
+      break;
+    case FX_CHARTYPE_ArabicAlef:
+    case FX_CHARTYPE_ArabicSpecial:
+    case FX_CHARTYPE_ArabicDistortion:
+    case FX_CHARTYPE_ArabicNormal:
+    case FX_CHARTYPE_ArabicForm:
+    case FX_CHARTYPE_Arabic:
+      dwRet2 = AppendChar_Arabic(pCurChar);
+      break;
+    case FX_CHARTYPE_Unknown:
+    case FX_CHARTYPE_Space:
+    case FX_CHARTYPE_Numeric:
+    case FX_CHARTYPE_Normal:
+    default:
+      dwRet2 = AppendChar_Others(pCurChar);
+      break;
+  }
+
+  m_eCharType = chartype;
+  return std::max(dwRet1, dwRet2);
+}
+
+void CFX_RTFBreak::AppendChar_Combination(CFX_Char* pCurChar) {
+  int32_t iCharWidth = 0;
+  if (!m_pFont->GetCharWidth(pCurChar->m_wCharCode, iCharWidth, false))
+    iCharWidth = 0;
+
+  iCharWidth *= m_iFontSize;
+  iCharWidth = iCharWidth * m_iHorizontalScale / 100;
+  CFX_Char* pLastChar = GetLastChar(0, false, true);
+  if (pLastChar && pLastChar->GetCharType() > FX_CHARTYPE_Combination)
+    iCharWidth = -iCharWidth;
+  else
+    m_eCharType = FX_CHARTYPE_Combination;
+
+  pCurChar->m_iCharWidth = iCharWidth;
+  if (iCharWidth > 0)
+    m_pCurLine->m_iWidth += iCharWidth;
+}
+
+void CFX_RTFBreak::AppendChar_Tab(CFX_Char* pCurChar) {
+  if (!(m_dwLayoutStyles & FX_LAYOUTSTYLE_ExpandTab))
+    return;
+
+  int32_t& iLineWidth = m_pCurLine->m_iWidth;
+  int32_t iCharWidth = iLineWidth;
+  if (GetPositionedTab(&iCharWidth))
+    iCharWidth -= iLineWidth;
+  else
+    iCharWidth = m_iTabWidth * (iLineWidth / m_iTabWidth + 1) - iLineWidth;
+
+  pCurChar->m_iCharWidth = iCharWidth;
+  iLineWidth += iCharWidth;
+}
+
+CFX_BreakType CFX_RTFBreak::AppendChar_Control(CFX_Char* pCurChar) {
+  CFX_BreakType dwRet2 = CFX_BreakType::None;
+  switch (pCurChar->m_wCharCode) {
+    case L'\v':
+    case 0x2028:
+      dwRet2 = CFX_BreakType::Line;
+      break;
+    case L'\f':
+      dwRet2 = CFX_BreakType::Page;
+      break;
+    case 0x2029:
+      dwRet2 = CFX_BreakType::Paragraph;
+      break;
+    default:
+      if (pCurChar->m_wCharCode == m_wParagraphBreakChar)
+        dwRet2 = CFX_BreakType::Paragraph;
+      break;
+  }
+  if (dwRet2 != CFX_BreakType::None)
+    dwRet2 = EndBreak(dwRet2);
+
+  return dwRet2;
+}
+
+CFX_BreakType CFX_RTFBreak::AppendChar_Arabic(CFX_Char* pCurChar) {
+  CFX_Char* pLastChar = nullptr;
+  int32_t iCharWidth = 0;
+  wchar_t wForm;
+  bool bAlef = false;
+  if (m_eCharType >= FX_CHARTYPE_ArabicAlef &&
+      m_eCharType <= FX_CHARTYPE_ArabicDistortion) {
+    pLastChar = GetLastChar(1, false, true);
+    if (pLastChar) {
+      m_pCurLine->m_iWidth -= pLastChar->m_iCharWidth;
+      CFX_Char* pPrevChar = GetLastChar(2, false, true);
+      wForm = pdfium::arabic::GetFormChar(pLastChar, pPrevChar, pCurChar);
+      bAlef = (wForm == 0xFEFF &&
+               pLastChar->GetCharType() == FX_CHARTYPE_ArabicAlef);
+      if (!m_pFont->GetCharWidth(wForm, iCharWidth, false) &&
+          !m_pFont->GetCharWidth(pLastChar->m_wCharCode, iCharWidth, false)) {
+        iCharWidth = m_iDefChar;
+      }
+
+      iCharWidth *= m_iFontSize;
+      iCharWidth = iCharWidth * m_iHorizontalScale / 100;
+      pLastChar->m_iCharWidth = iCharWidth;
+      m_pCurLine->m_iWidth += iCharWidth;
+      iCharWidth = 0;
+    }
+  }
+
+  wForm = pdfium::arabic::GetFormChar(pCurChar, bAlef ? nullptr : pLastChar,
+                                      nullptr);
+  if (!m_pFont->GetCharWidth(wForm, iCharWidth, false) &&
+      !m_pFont->GetCharWidth(pCurChar->m_wCharCode, iCharWidth, false)) {
+    iCharWidth = m_iDefChar;
+  }
+
+  iCharWidth *= m_iFontSize;
+  iCharWidth = iCharWidth * m_iHorizontalScale / 100;
+  pCurChar->m_iCharWidth = iCharWidth;
+  m_pCurLine->m_iWidth += iCharWidth;
+  m_pCurLine->m_iArabicChars++;
+
+  if (m_pCurLine->GetLineEnd() > m_iLineWidth + m_iTolerance)
+    return EndBreak(CFX_BreakType::Line);
+  return CFX_BreakType::None;
+}
+
+CFX_BreakType CFX_RTFBreak::AppendChar_Others(CFX_Char* pCurChar) {
+  FX_CHARTYPE chartype = pCurChar->GetCharType();
+  wchar_t wForm = pCurChar->m_wCharCode;
+  int32_t iCharWidth = 0;
+  if (!m_pFont->GetCharWidth(wForm, iCharWidth, false))
+    iCharWidth = m_iDefChar;
+
+  iCharWidth *= m_iFontSize;
+  iCharWidth *= m_iHorizontalScale / 100;
+  iCharWidth += m_iCharSpace;
+
+  pCurChar->m_iCharWidth = iCharWidth;
+  m_pCurLine->m_iWidth += iCharWidth;
+  if (chartype != FX_CHARTYPE_Space &&
+      m_pCurLine->GetLineEnd() > m_iLineWidth + m_iTolerance) {
+    return EndBreak(CFX_BreakType::Line);
+  }
+  return CFX_BreakType::None;
+}
+
+CFX_BreakType CFX_RTFBreak::EndBreak(CFX_BreakType dwStatus) {
+  ASSERT(dwStatus != CFX_BreakType::None);
+
+  ++m_dwIdentity;
+  if (!m_pCurLine->m_LinePieces.empty()) {
+    if (dwStatus != CFX_BreakType::Piece)
+      m_pCurLine->m_LinePieces.back().m_dwStatus = dwStatus;
+    return m_pCurLine->m_LinePieces.back().m_dwStatus;
+  }
+
+  if (HasLine()) {
+    if (!m_Line[m_iReadyLineIndex].m_LinePieces.empty()) {
+      if (dwStatus != CFX_BreakType::Piece)
+        m_Line[m_iReadyLineIndex].m_LinePieces.back().m_dwStatus = dwStatus;
+      return m_Line[m_iReadyLineIndex].m_LinePieces.back().m_dwStatus;
+    }
+    return CFX_BreakType::None;
+  }
+
+  int32_t iCount = m_pCurLine->CountChars();
+  if (iCount < 1)
+    return CFX_BreakType::None;
+
+  CFX_Char* tc = m_pCurLine->GetChar(iCount - 1);
+  tc->m_dwStatus = dwStatus;
+  if (dwStatus == CFX_BreakType::Piece)
+    return dwStatus;
+
+  m_iReadyLineIndex = m_pCurLine == &m_Line[0] ? 0 : 1;
+  CFX_BreakLine* pNextLine = &m_Line[1 - m_iReadyLineIndex];
+  bool bAllChars = m_iAlignment == CFX_RTFLineAlignment::Justified ||
+                   m_iAlignment == CFX_RTFLineAlignment::Distributed;
+
+  if (!EndBreak_SplitLine(pNextLine, bAllChars, dwStatus)) {
+    std::deque<FX_TPO> tpos;
+    EndBreak_BidiLine(&tpos, dwStatus);
+    if (!m_bPagination && m_iAlignment != CFX_RTFLineAlignment::Left)
+      EndBreak_Alignment(tpos, bAllChars, dwStatus);
+  }
+  m_pCurLine = pNextLine;
+  m_pCurLine->m_iStart = m_iLineStart;
+
+  CFX_Char* pTC = GetLastChar(0, false, true);
+  m_eCharType = pTC ? pTC->GetCharType() : FX_CHARTYPE_Unknown;
+  return dwStatus;
+}
+
+bool CFX_RTFBreak::EndBreak_SplitLine(CFX_BreakLine* pNextLine,
+                                      bool bAllChars,
+                                      CFX_BreakType dwStatus) {
+  bool bDone = false;
+  if (m_pCurLine->GetLineEnd() > m_iLineWidth + m_iTolerance) {
+    const CFX_Char* tc = m_pCurLine->GetChar(m_pCurLine->CountChars() - 1);
+    switch (tc->GetCharType()) {
+      case FX_CHARTYPE_Tab:
+      case FX_CHARTYPE_Control:
+      case FX_CHARTYPE_Space:
+        break;
+      default:
+        SplitTextLine(m_pCurLine, pNextLine, !m_bPagination && bAllChars);
+        bDone = true;
+        break;
+    }
+  }
+
+  if (!m_bPagination) {
+    if (bAllChars && !bDone) {
+      int32_t endPos = m_pCurLine->GetLineEnd();
+      GetBreakPos(m_pCurLine->m_LineChars, endPos, bAllChars, true);
+    }
+    return false;
+  }
+
+  const CFX_Char* pCurChars = m_pCurLine->m_LineChars.data();
+  CFX_BreakPiece tp;
+  tp.m_pChars = &m_pCurLine->m_LineChars;
+  bool bNew = true;
+  uint32_t dwIdentity = static_cast<uint32_t>(-1);
+  int32_t iLast = m_pCurLine->CountChars() - 1;
+  int32_t j = 0;
+  for (int32_t i = 0; i <= iLast;) {
+    const CFX_Char* pTC = pCurChars + i;
+    if (bNew) {
+      tp.m_iStartChar = i;
+      tp.m_iStartPos += tp.m_iWidth;
+      tp.m_iWidth = 0;
+      tp.m_dwStatus = pTC->m_dwStatus;
+      tp.m_iFontSize = pTC->m_iFontSize;
+      tp.m_iHorizontalScale = pTC->m_iHorizontalScale;
+      tp.m_iVerticalScale = pTC->m_iVerticalScale;
+      dwIdentity = pTC->m_dwIdentity;
+      tp.m_dwIdentity = dwIdentity;
+      tp.m_pUserData = pTC->m_pUserData;
+      j = i;
+      bNew = false;
+    }
+
+    if (i == iLast || pTC->m_dwStatus != CFX_BreakType::None ||
+        pTC->m_dwIdentity != dwIdentity) {
+      tp.m_iChars = i - j;
+      if (pTC->m_dwIdentity == dwIdentity) {
+        tp.m_dwStatus = pTC->m_dwStatus;
+        tp.m_iWidth += pTC->m_iCharWidth;
+        tp.m_iChars += 1;
+        ++i;
+      }
+      m_pCurLine->m_LinePieces.push_back(tp);
+      bNew = true;
+    } else {
+      tp.m_iWidth += pTC->m_iCharWidth;
+      ++i;
+    }
+  }
+  return true;
+}
+
+void CFX_RTFBreak::EndBreak_BidiLine(std::deque<FX_TPO>* tpos,
+                                     CFX_BreakType dwStatus) {
+  CFX_Char* pTC;
+  std::vector<CFX_Char>& chars = m_pCurLine->m_LineChars;
+  int32_t iCount = m_pCurLine->CountChars();
+  if (!m_bPagination && m_pCurLine->m_iArabicChars > 0) {
+    int32_t iBidiNum = 0;
+    for (int32_t i = 0; i < iCount; ++i) {
+      pTC = &chars[i];
+      pTC->m_iBidiPos = i;
+      if (pTC->GetCharType() != FX_CHARTYPE_Control)
+        iBidiNum = i;
+      if (i == 0)
+        pTC->m_iBidiLevel = 1;
+    }
+    FX_BidiLine(&chars, iBidiNum + 1);
+  } else {
+    for (int32_t i = 0; i < iCount; ++i) {
+      pTC = &chars[i];
+      pTC->m_iBidiLevel = 0;
+      pTC->m_iBidiPos = 0;
+      pTC->m_iBidiOrder = 0;
+    }
+  }
+
+  CFX_BreakPiece tp;
+  tp.m_dwStatus = CFX_BreakType::Piece;
+  tp.m_iStartPos = m_pCurLine->m_iStart;
+  tp.m_pChars = &chars;
+
+  int32_t iBidiLevel = -1;
+  int32_t iCharWidth;
+  FX_TPO tpo;
+  uint32_t dwIdentity = static_cast<uint32_t>(-1);
+  int32_t i = 0;
+  int32_t j = 0;
+  while (i < iCount) {
+    pTC = &chars[i];
+    if (iBidiLevel < 0) {
+      iBidiLevel = pTC->m_iBidiLevel;
+      iCharWidth = pTC->m_iCharWidth;
+      tp.m_iWidth = iCharWidth < 1 ? 0 : iCharWidth;
+      tp.m_iBidiLevel = iBidiLevel;
+      tp.m_iBidiPos = pTC->m_iBidiOrder;
+      tp.m_iFontSize = pTC->m_iFontSize;
+      tp.m_iHorizontalScale = pTC->m_iHorizontalScale;
+      tp.m_iVerticalScale = pTC->m_iVerticalScale;
+      dwIdentity = pTC->m_dwIdentity;
+      tp.m_dwIdentity = dwIdentity;
+      tp.m_pUserData = pTC->m_pUserData;
+      tp.m_dwStatus = CFX_BreakType::Piece;
+      ++i;
+    } else if (iBidiLevel != pTC->m_iBidiLevel ||
+               pTC->m_dwIdentity != dwIdentity) {
+      tp.m_iChars = i - tp.m_iStartChar;
+      m_pCurLine->m_LinePieces.push_back(tp);
+
+      tp.m_iStartPos += tp.m_iWidth;
+      tp.m_iStartChar = i;
+      tpo.index = j++;
+      tpo.pos = tp.m_iBidiPos;
+      tpos->push_back(tpo);
+      iBidiLevel = -1;
+    } else {
+      iCharWidth = pTC->m_iCharWidth;
+      if (iCharWidth > 0)
+        tp.m_iWidth += iCharWidth;
+      ++i;
+    }
+  }
+
+  if (i > tp.m_iStartChar) {
+    tp.m_dwStatus = dwStatus;
+    tp.m_iChars = i - tp.m_iStartChar;
+    m_pCurLine->m_LinePieces.push_back(tp);
+
+    tpo.index = j;
+    tpo.pos = tp.m_iBidiPos;
+    tpos->push_back(tpo);
+  }
+
+  std::sort(tpos->begin(), tpos->end());
+  int32_t iStartPos = m_pCurLine->m_iStart;
+  for (const auto& it : *tpos) {
+    CFX_BreakPiece& ttp = m_pCurLine->m_LinePieces[it.index];
+    ttp.m_iStartPos = iStartPos;
+    iStartPos += ttp.m_iWidth;
+  }
+}
+
+void CFX_RTFBreak::EndBreak_Alignment(const std::deque<FX_TPO>& tpos,
+                                      bool bAllChars,
+                                      CFX_BreakType dwStatus) {
+  int32_t iNetWidth = m_pCurLine->m_iWidth;
+  int32_t iGapChars = 0;
+  bool bFind = false;
+  for (auto it = tpos.rbegin(); it != tpos.rend(); it++) {
+    CFX_BreakPiece& ttp = m_pCurLine->m_LinePieces[it->index];
+    if (!bFind)
+      iNetWidth = ttp.GetEndPos();
+
+    bool bArabic = FX_IsOdd(ttp.m_iBidiLevel);
+    int32_t j = bArabic ? 0 : ttp.m_iChars - 1;
+    while (j > -1 && j < ttp.m_iChars) {
+      const CFX_Char* tc = ttp.GetChar(j);
+      if (tc->m_nBreakType == FX_LBT_DIRECT_BRK)
+        ++iGapChars;
+
+      if (!bFind || !bAllChars) {
+        uint32_t dwCharType = tc->GetCharType();
+        if (dwCharType == FX_CHARTYPE_Space ||
+            dwCharType == FX_CHARTYPE_Control) {
+          if (!bFind) {
+            int32_t iCharWidth = tc->m_iCharWidth;
+            if (bAllChars && iCharWidth > 0)
+              iNetWidth -= iCharWidth;
+          }
+        } else {
+          bFind = true;
+          if (!bAllChars)
+            break;
+        }
+      }
+      j += bArabic ? 1 : -1;
+    }
+    if (!bAllChars && bFind)
+      break;
+  }
+
+  int32_t iOffset = m_iLineWidth - iNetWidth;
+  if (iGapChars > 0 && (m_iAlignment == CFX_RTFLineAlignment::Distributed ||
+                        (m_iAlignment == CFX_RTFLineAlignment::Justified &&
+                         dwStatus != CFX_BreakType::Paragraph))) {
+    int32_t iStart = -1;
+    for (const auto& tpo : tpos) {
+      CFX_BreakPiece& ttp = m_pCurLine->m_LinePieces[tpo.index];
+      if (iStart < 0)
+        iStart = ttp.m_iStartPos;
+      else
+        ttp.m_iStartPos = iStart;
+
+      for (int32_t j = 0; j < ttp.m_iChars; ++j) {
+        CFX_Char* tc = ttp.GetChar(j);
+        if (tc->m_nBreakType != FX_LBT_DIRECT_BRK || tc->m_iCharWidth < 0)
+          continue;
+
+        int32_t k = iOffset / iGapChars;
+        tc->m_iCharWidth += k;
+        ttp.m_iWidth += k;
+        iOffset -= k;
+        --iGapChars;
+        if (iGapChars < 1)
+          break;
+      }
+      iStart += ttp.m_iWidth;
+    }
+  } else if (m_iAlignment == CFX_RTFLineAlignment::Right ||
+             m_iAlignment == CFX_RTFLineAlignment::Center) {
+    if (m_iAlignment == CFX_RTFLineAlignment::Center)
+      iOffset /= 2;
+    if (iOffset > 0) {
+      for (auto& ttp : m_pCurLine->m_LinePieces)
+        ttp.m_iStartPos += iOffset;
+    }
+  }
+}
+
+int32_t CFX_RTFBreak::GetBreakPos(std::vector<CFX_Char>& tca,
+                                  int32_t& iEndPos,
+                                  bool bAllChars,
+                                  bool bOnlyBrk) {
+  int32_t iLength = pdfium::CollectionSize<int32_t>(tca) - 1;
+  if (iLength < 1)
+    return iLength;
+
+  int32_t iBreak = -1;
+  int32_t iBreakPos = -1;
+  int32_t iIndirect = -1;
+  int32_t iIndirectPos = -1;
+  int32_t iLast = -1;
+  int32_t iLastPos = -1;
+  if (iEndPos <= m_iLineWidth) {
+    if (!bAllChars)
+      return iLength;
+
+    iBreak = iLength;
+    iBreakPos = iEndPos;
+  }
+
+  CFX_Char* pCharArray = tca.data();
+  CFX_Char* pCur = pCharArray + iLength;
+  --iLength;
+  if (bAllChars)
+    pCur->m_nBreakType = FX_LBT_UNKNOWN;
+
+  uint32_t nCodeProp = pCur->m_dwCharProps;
+  uint32_t nNext = nCodeProp & 0x003F;
+  int32_t iCharWidth = pCur->m_iCharWidth;
+  if (iCharWidth > 0)
+    iEndPos -= iCharWidth;
+
+  while (iLength >= 0) {
+    pCur = pCharArray + iLength;
+    nCodeProp = pCur->m_dwCharProps;
+    uint32_t nCur = nCodeProp & 0x003F;
+    bool bNeedBreak = false;
+    FX_LINEBREAKTYPE eType;
+    if (nCur == FX_CBP_TB) {
+      bNeedBreak = true;
+      eType = nNext == FX_CBP_TB ? FX_LBT_PROHIBITED_BRK
+                                 : gs_FX_LineBreak_PairTable[nCur][nNext];
+    } else {
+      if (nCur == FX_CBP_SP)
+        bNeedBreak = true;
+
+      eType = nNext == FX_CBP_SP ? FX_LBT_PROHIBITED_BRK
+                                 : gs_FX_LineBreak_PairTable[nCur][nNext];
+    }
+    if (bAllChars)
+      pCur->m_nBreakType = eType;
+
+    if (!bOnlyBrk) {
+      iCharWidth = pCur->m_iCharWidth;
+      if (iEndPos <= m_iLineWidth || bNeedBreak) {
+        if (eType == FX_LBT_DIRECT_BRK && iBreak < 0) {
+          iBreak = iLength;
+          iBreakPos = iEndPos;
+          if (!bAllChars)
+            return iLength;
+        } else if (eType == FX_LBT_INDIRECT_BRK && iIndirect < 0) {
+          iIndirect = iLength;
+          iIndirectPos = iEndPos;
+        }
+        if (iLast < 0) {
+          iLast = iLength;
+          iLastPos = iEndPos;
+        }
+      }
+      if (iCharWidth > 0)
+        iEndPos -= iCharWidth;
+    }
+    nNext = nCodeProp & 0x003F;
+    --iLength;
+  }
+  if (bOnlyBrk)
+    return 0;
+
+  if (iBreak > -1) {
+    iEndPos = iBreakPos;
+    return iBreak;
+  }
+  if (iIndirect > -1) {
+    iEndPos = iIndirectPos;
+    return iIndirect;
+  }
+  if (iLast > -1) {
+    iEndPos = iLastPos;
+    return iLast;
+  }
+  return 0;
+}
+
+void CFX_RTFBreak::SplitTextLine(CFX_BreakLine* pCurLine,
+                                 CFX_BreakLine* pNextLine,
+                                 bool bAllChars) {
+  ASSERT(pCurLine && pNextLine);
+  int32_t iCount = pCurLine->CountChars();
+  if (iCount < 2)
+    return;
+
+  int32_t iEndPos = pCurLine->GetLineEnd();
+  std::vector<CFX_Char>& curChars = pCurLine->m_LineChars;
+  int32_t iCharPos = GetBreakPos(curChars, iEndPos, bAllChars, false);
+  if (iCharPos < 0)
+    iCharPos = 0;
+
+  ++iCharPos;
+  if (iCharPos >= iCount) {
+    pNextLine->Clear();
+    curChars[iCharPos - 1].m_nBreakType = FX_LBT_UNKNOWN;
+    return;
+  }
+
+  pNextLine->m_LineChars =
+      std::vector<CFX_Char>(curChars.begin() + iCharPos, curChars.end());
+  curChars.erase(curChars.begin() + iCharPos, curChars.end());
+  pNextLine->m_iStart = pCurLine->m_iStart;
+  pNextLine->m_iWidth = pCurLine->GetLineEnd() - iEndPos;
+  pCurLine->m_iWidth = iEndPos;
+  curChars[iCharPos - 1].m_nBreakType = FX_LBT_UNKNOWN;
+
+  for (size_t i = 0; i < pNextLine->m_LineChars.size(); ++i) {
+    if (pNextLine->m_LineChars[i].GetCharType() >= FX_CHARTYPE_ArabicAlef) {
+      pCurLine->m_iArabicChars--;
+      pNextLine->m_iArabicChars++;
+    }
+    pNextLine->m_LineChars[i].m_dwStatus = CFX_BreakType::None;
+  }
+}
+
+int32_t CFX_RTFBreak::GetDisplayPos(const FX_RTFTEXTOBJ* pText,
+                                    FXTEXT_CHARPOS* pCharPos,
+                                    bool bCharCode) const {
+  if (!pText || pText->iLength < 1)
+    return 0;
+
+  ASSERT(pText->pFont && pText->pRect);
+
+  CFX_RetainPtr<CFGAS_GEFont> pFont = pText->pFont;
+  CFX_RectF rtText(*pText->pRect);
+  bool bRTLPiece = FX_IsOdd(pText->iBidiLevel);
+  float fFontSize = pText->fFontSize;
+  int32_t iFontSize = FXSYS_round(fFontSize * 20.0f);
+  int32_t iAscent = pFont->GetAscent();
+  int32_t iDescent = pFont->GetDescent();
+  int32_t iMaxHeight = iAscent - iDescent;
+  float fFontHeight = fFontSize;
+  float fAscent = fFontHeight * static_cast<float>(iAscent) /
+                  static_cast<float>(iMaxHeight);
+  wchar_t wPrev = 0xFEFF;
+  wchar_t wNext;
+  float fX = rtText.left;
+  int32_t iHorScale = pText->iHorizontalScale;
+  int32_t iVerScale = pText->iVerticalScale;
+  if (bRTLPiece)
+    fX = rtText.right();
+
+  float fY = rtText.top + fAscent;
+  int32_t iCount = 0;
+  for (int32_t i = 0; i < pText->iLength; ++i) {
+    wchar_t wch = pText->pStr[i];
+    int32_t iWidth = pText->pWidths[i];
+    uint32_t dwProps = FX_GetUnicodeProperties(wch);
+    uint32_t dwCharType = (dwProps & FX_CHARTYPEBITSMASK);
+    if (iWidth == 0) {
+      if (dwCharType == FX_CHARTYPE_ArabicAlef)
+        wPrev = 0xFEFF;
+      continue;
+    }
+
+    int32_t iCharWidth = abs(iWidth);
+    bool bEmptyChar =
+        (dwCharType >= FX_CHARTYPE_Tab && dwCharType <= FX_CHARTYPE_Control);
+    if (!bEmptyChar)
+      ++iCount;
+
+    if (pCharPos) {
+      iCharWidth /= iFontSize;
+      wchar_t wForm = wch;
+      if (dwCharType >= FX_CHARTYPE_ArabicAlef) {
+        if (i + 1 < pText->iLength) {
+          wNext = pText->pStr[i + 1];
+          if (pText->pWidths[i + 1] < 0 && i + 2 < pText->iLength)
+            wNext = pText->pStr[i + 2];
+        } else {
+          wNext = 0xFEFF;
+        }
+        wForm = pdfium::arabic::GetFormChar(wch, wPrev, wNext);
+      } else if (bRTLPiece) {
+        wForm = FX_GetMirrorChar(wch, dwProps, bRTLPiece, false);
+      }
+      dwProps = FX_GetUnicodeProperties(wForm);
+
+      if (!bEmptyChar) {
+        if (bCharCode) {
+          pCharPos->m_GlyphIndex = wch;
+        } else {
+          pCharPos->m_GlyphIndex = pFont->GetGlyphIndex(wForm, false);
+          if (pCharPos->m_GlyphIndex == 0xFFFF)
+            pCharPos->m_GlyphIndex = pFont->GetGlyphIndex(wch, false);
+        }
+#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
+        pCharPos->m_ExtGID = pCharPos->m_GlyphIndex;
+#endif
+        pCharPos->m_FontCharWidth = iCharWidth;
+      }
+
+      float fCharWidth = fFontSize * iCharWidth / 1000.0f;
+      if (bRTLPiece && dwCharType != FX_CHARTYPE_Combination)
+        fX -= fCharWidth;
+
+      if (!bEmptyChar)
+        pCharPos->m_Origin = CFX_PointF(fX, fY);
+      if (!bRTLPiece && dwCharType != FX_CHARTYPE_Combination)
+        fX += fCharWidth;
+
+      if (!bEmptyChar) {
+        pCharPos->m_bGlyphAdjust = true;
+        pCharPos->m_AdjustMatrix[0] = -1;
+        pCharPos->m_AdjustMatrix[1] = 0;
+        pCharPos->m_AdjustMatrix[2] = 0;
+        pCharPos->m_AdjustMatrix[3] = 1;
+        pCharPos->m_Origin.y += fAscent * iVerScale / 100.0f;
+        pCharPos->m_Origin.y -= fAscent;
+
+        if (iHorScale != 100 || iVerScale != 100) {
+          pCharPos->m_AdjustMatrix[0] =
+              pCharPos->m_AdjustMatrix[0] * iHorScale / 100.0f;
+          pCharPos->m_AdjustMatrix[1] =
+              pCharPos->m_AdjustMatrix[1] * iHorScale / 100.0f;
+          pCharPos->m_AdjustMatrix[2] =
+              pCharPos->m_AdjustMatrix[2] * iVerScale / 100.0f;
+          pCharPos->m_AdjustMatrix[3] =
+              pCharPos->m_AdjustMatrix[3] * iVerScale / 100.0f;
+        }
+        ++pCharPos;
+      }
+    }
+    if (iWidth > 0)
+      wPrev = wch;
+  }
+  return iCount;
+}
+
+FX_RTFTEXTOBJ::FX_RTFTEXTOBJ()
+    : pFont(nullptr),
+      pRect(nullptr),
+      wLineBreakChar(L'\n'),
+      fFontSize(12.0f),
+      iLength(0),
+      iBidiLevel(0),
+      iHorizontalScale(100),
+      iVerticalScale(100) {}
+
+FX_RTFTEXTOBJ::~FX_RTFTEXTOBJ() {}