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      1 // Copyright 2014 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #include "../../include/fxcrt/fx_ext.h"
      8 #include "fx_arabic.h"
      9 extern const FX_DWORD gs_FX_TextLayout_CodeProperties[65536];
     10 IFX_BidiChar* IFX_BidiChar::Create()
     11 {
     12     return FX_NEW CFX_BidiChar;
     13 }
     14 CFX_BidiChar::CFX_BidiChar()
     15     : m_bSeparateNeutral(TRUE)
     16     , m_iCurStart(0)
     17     , m_iCurCount(0)
     18     , m_iCurBidi(0)
     19     , m_iLastBidi(0)
     20     , m_iLastStart(0)
     21     , m_iLastCount(0)
     22 {
     23 }
     24 FX_BOOL CFX_BidiChar::AppendChar(FX_WCHAR wch)
     25 {
     26     FX_DWORD dwProps = gs_FX_TextLayout_CodeProperties[(FX_WORD)wch];
     27     FX_INT32 iBidiCls = (dwProps & FX_BIDICLASSBITSMASK) >> FX_BIDICLASSBITS;
     28     FX_INT32 iContext = 0;
     29     switch (iBidiCls) {
     30         case FX_BIDICLASS_L:
     31         case FX_BIDICLASS_AN:
     32         case FX_BIDICLASS_EN:
     33             iContext = 1;
     34             break;
     35         case FX_BIDICLASS_R:
     36         case FX_BIDICLASS_AL:
     37             iContext = 2;
     38             break;
     39     }
     40     FX_BOOL bRet = FALSE;
     41     if (iContext != m_iCurBidi) {
     42         if (m_bSeparateNeutral) {
     43             bRet = TRUE;
     44         } else {
     45             if (m_iCurBidi == 0) {
     46                 bRet = (m_iCurCount > 0);
     47             } else {
     48                 bRet = (iContext != 0);
     49             }
     50         }
     51         if (bRet) {
     52             m_iLastBidi = m_iCurBidi;
     53             m_iLastStart = m_iCurStart;
     54             m_iCurStart = m_iCurCount;
     55             m_iLastCount = m_iCurCount - m_iLastStart;
     56         }
     57         if (m_bSeparateNeutral || iContext != 0) {
     58             m_iCurBidi = iContext;
     59         }
     60     }
     61     m_iCurCount ++;
     62     return bRet;
     63 }
     64 FX_BOOL CFX_BidiChar::EndChar()
     65 {
     66     m_iLastBidi = m_iCurBidi;
     67     m_iLastStart = m_iCurStart;
     68     m_iCurStart = m_iCurCount;
     69     m_iLastCount = m_iCurCount - m_iLastStart;
     70     return m_iLastCount > 0;
     71 }
     72 FX_INT32 CFX_BidiChar::GetBidiInfo(FX_INT32 &iStart, FX_INT32 &iCount)
     73 {
     74     iStart = m_iLastStart;
     75     iCount = m_iLastCount;
     76     return m_iLastBidi;
     77 }
     78 void CFX_BidiChar::Reset()
     79 {
     80     m_iCurStart = 0;
     81     m_iCurCount = 0;
     82     m_iCurBidi = 0;
     83     m_iLastBidi = 0;
     84     m_iLastStart = 0;
     85     m_iLastCount = 0;
     86 }
     87