fx_unicode.cpp revision ee451cb395940862dad63c85adfe8f2fd55e864c 
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"
8extern const FX_DWORD gs_FX_TextLayout_CodeProperties[65536];
9extern const FX_WCHAR gs_FX_TextLayout_VerticalMirror[64];
10extern const FX_WCHAR gs_FX_TextLayout_BidiMirror[512];
11FX_DWORD FX_GetUnicodeProperties(FX_WCHAR wch)
12{
13    return gs_FX_TextLayout_CodeProperties[(FX_WORD)wch];
14}
15FX_BOOL FX_IsCtrlCode(FX_WCHAR ch)
16{
17    FX_DWORD dwRet = (gs_FX_TextLayout_CodeProperties[(FX_WORD)ch] & FX_CHARTYPEBITSMASK);
18    return dwRet == FX_CHARTYPE_Tab || dwRet == FX_CHARTYPE_Control;
19}
20FX_BOOL FX_IsRotationCode(FX_WCHAR ch)
21{
22    return (gs_FX_TextLayout_CodeProperties[(FX_WORD)ch] & 0x8000) != 0;
23}
24FX_BOOL FX_IsCombinationChar(FX_WCHAR wch)
25{
26    FX_DWORD dwProps = (gs_FX_TextLayout_CodeProperties[(FX_WORD)wch] & FX_CHARTYPEBITSMASK);
27    return dwProps == FX_CHARTYPE_Combination;
28}
29FX_BOOL	FX_IsBidiChar(FX_WCHAR wch)
30{
31    FX_DWORD dwProps = gs_FX_TextLayout_CodeProperties[(FX_WORD)wch];
32    FX_INT32 iBidiCls = (dwProps & FX_BIDICLASSBITSMASK) >> FX_BIDICLASSBITS;
33    return (FX_BIDICLASS_R == iBidiCls || FX_BIDICLASS_AL == iBidiCls);
34}
35FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch, FX_BOOL bRTL, FX_BOOL bVertical)
36{
37    FX_DWORD dwProps = gs_FX_TextLayout_CodeProperties[(FX_WORD)wch];
38    FX_DWORD dwTemp = (dwProps & 0xFF800000);
39    if (bRTL && dwTemp < 0xFF800000) {
40        wch = gs_FX_TextLayout_BidiMirror[dwTemp >> 23];
41        dwProps = gs_FX_TextLayout_CodeProperties[(FX_WORD)wch];
42    }
43    if (bVertical) {
44        dwTemp = (dwProps & 0x007E0000);
45        if (dwTemp < 0x007E0000) {
46            wch = gs_FX_TextLayout_VerticalMirror[dwTemp >> 17];
47        }
48    }
49    return wch;
50}
51FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch, FX_DWORD dwProps, FX_BOOL bRTL, FX_BOOL bVertical)
52{
53    FX_DWORD dwTemp = (dwProps & 0xFF800000);
54    if (bRTL && dwTemp < 0xFF800000) {
55        wch = gs_FX_TextLayout_BidiMirror[dwTemp >> 23];
56        dwProps = gs_FX_TextLayout_CodeProperties[(FX_WORD)wch];
57    }
58    if (bVertical) {
59        dwTemp = (dwProps & 0x007E0000);
60        if (dwTemp < 0x007E0000) {
61            wch = gs_FX_TextLayout_VerticalMirror[dwTemp >> 17];
62        }
63    }
64    return wch;
65}
66