1 // Copyright 2016 The PDFium Authors
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 "core/fxge/cfx_unicodeencodingex.h"
8
9 #include <memory>
10
11 #include "core/fxge/cfx_font.h"
12 #include "core/fxge/freetype/fx_freetype.h"
13 #include "core/fxge/fx_font.h"
14
15 #define ENC_TAG(a, b, c, d) \
16 (((uint32_t)(a) << 24) | ((uint32_t)(b) << 16) | ((uint32_t)(c) << 8) | \
17 (uint32_t)(d))
18
19 namespace {
20
21 constexpr uint32_t kEncodingExSymbol = ENC_TAG('s', 'y', 'm', 'b');
22 constexpr uint32_t kEncodingExUnicode = ENC_TAG('u', 'n', 'i', 'c');
23 constexpr uint32_t kEncodingExSjis = ENC_TAG('s', 'j', 'i', 's');
24 constexpr uint32_t kEncodingExGB2312 = ENC_TAG('g', 'b', ' ', ' ');
25 constexpr uint32_t kEncodingExBig5 = ENC_TAG('b', 'i', 'g', '5');
26 constexpr uint32_t kEncodingExWansung = ENC_TAG('w', 'a', 'n', 's');
27 constexpr uint32_t kEncodingExJohab = ENC_TAG('j', 'o', 'h', 'a');
28 constexpr uint32_t kEncodingExAdobeStandard = ENC_TAG('A', 'D', 'O', 'B');
29 constexpr uint32_t kEncodingExAdobeExpert = ENC_TAG('A', 'D', 'B', 'E');
30 constexpr uint32_t kEncodingExAdobeCustom = ENC_TAG('A', 'D', 'B', 'C');
31 constexpr uint32_t kEncodingExLatin1 = ENC_TAG('l', 'a', 't', '1');
32 constexpr uint32_t kEncodingExOldLatin2 = ENC_TAG('l', 'a', 't', '2');
33 constexpr uint32_t kEncodingExAppleRoman = ENC_TAG('a', 'r', 'm', 'n');
34
35 constexpr uint32_t kEncodingID[] = {
36 kEncodingExSymbol, kEncodingExUnicode, kEncodingExSjis,
37 kEncodingExGB2312, kEncodingExBig5, kEncodingExWansung,
38 kEncodingExJohab, kEncodingExAdobeStandard, kEncodingExAdobeExpert,
39 kEncodingExAdobeCustom, kEncodingExLatin1, kEncodingExOldLatin2,
40 kEncodingExAppleRoman,
41 };
42
FXFM_CreateFontEncoding(CFX_Font * pFont,uint32_t nEncodingID)43 std::unique_ptr<CFX_UnicodeEncodingEx> FXFM_CreateFontEncoding(
44 CFX_Font* pFont,
45 uint32_t nEncodingID) {
46 if (FXFT_Select_Charmap(pFont->GetFaceRec(), nEncodingID))
47 return nullptr;
48 return std::make_unique<CFX_UnicodeEncodingEx>(pFont, nEncodingID);
49 }
50
51 } // namespace
52
CFX_UnicodeEncodingEx(CFX_Font * pFont,uint32_t EncodingID)53 CFX_UnicodeEncodingEx::CFX_UnicodeEncodingEx(CFX_Font* pFont,
54 uint32_t EncodingID)
55 : CFX_UnicodeEncoding(pFont), m_nEncodingID(EncodingID) {}
56
57 CFX_UnicodeEncodingEx::~CFX_UnicodeEncodingEx() = default;
58
GlyphFromCharCode(uint32_t charcode)59 uint32_t CFX_UnicodeEncodingEx::GlyphFromCharCode(uint32_t charcode) {
60 FXFT_FaceRec* face = m_pFont->GetFaceRec();
61 FT_UInt nIndex = FT_Get_Char_Index(face, charcode);
62 if (nIndex > 0)
63 return nIndex;
64 int m = 0;
65 while (m < face->num_charmaps) {
66 uint32_t nEncodingID = FXFT_Get_Charmap_Encoding(face->charmaps[m++]);
67 if (m_nEncodingID == nEncodingID)
68 continue;
69 int error = FXFT_Select_Charmap(face, nEncodingID);
70 if (error)
71 continue;
72 nIndex = FT_Get_Char_Index(face, charcode);
73 if (nIndex > 0) {
74 m_nEncodingID = nEncodingID;
75 return nIndex;
76 }
77 }
78 FXFT_Select_Charmap(face, m_nEncodingID);
79 return 0;
80 }
81
CharCodeFromUnicode(wchar_t Unicode) const82 uint32_t CFX_UnicodeEncodingEx::CharCodeFromUnicode(wchar_t Unicode) const {
83 if (m_nEncodingID == kEncodingExUnicode ||
84 m_nEncodingID == kEncodingExSymbol) {
85 return Unicode;
86 }
87 FXFT_FaceRec* face = m_pFont->GetFaceRec();
88 for (int i = 0; i < face->num_charmaps; i++) {
89 int nEncodingID = FXFT_Get_Charmap_Encoding(face->charmaps[i]);
90 if (nEncodingID == kEncodingExUnicode || nEncodingID == kEncodingExSymbol) {
91 return Unicode;
92 }
93 }
94 return kInvalidCharCode;
95 }
96
FX_CreateFontEncodingEx(CFX_Font * pFont)97 std::unique_ptr<CFX_UnicodeEncodingEx> FX_CreateFontEncodingEx(
98 CFX_Font* pFont) {
99 if (!pFont || !pFont->GetFaceRec())
100 return nullptr;
101
102 for (uint32_t id : kEncodingID) {
103 auto pFontEncoding = FXFM_CreateFontEncoding(pFont, id);
104 if (pFontEncoding)
105 return pFontEncoding;
106 }
107 return nullptr;
108 }
109