| John Abd-El-Malek | 5110c47 | 2014-05-17 22:33:34 -0700 | [diff] [blame] | 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 | } |
