1 // Copyright 2016 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 "core/fpdfapi/font/cpdf_simplefont.h"
8
9 #include "core/fpdfapi/font/font_int.h"
10 #include "core/fpdfapi/parser/cpdf_array.h"
11 #include "core/fpdfapi/parser/cpdf_dictionary.h"
12 #include "core/fxge/fx_freetype.h"
13 #include "third_party/base/numerics/safe_math.h"
14
CPDF_SimpleFont()15 CPDF_SimpleFont::CPDF_SimpleFont() : m_BaseEncoding(PDFFONT_ENCODING_BUILTIN) {
16 FXSYS_memset(m_CharWidth, 0xff, sizeof(m_CharWidth));
17 FXSYS_memset(m_GlyphIndex, 0xff, sizeof(m_GlyphIndex));
18 FXSYS_memset(m_ExtGID, 0xff, sizeof(m_ExtGID));
19 for (size_t i = 0; i < FX_ArraySize(m_CharBBox); ++i)
20 m_CharBBox[i] = FX_RECT(-1, -1, -1, -1);
21 }
22
~CPDF_SimpleFont()23 CPDF_SimpleFont::~CPDF_SimpleFont() {}
24
GlyphFromCharCode(uint32_t charcode,bool * pVertGlyph)25 int CPDF_SimpleFont::GlyphFromCharCode(uint32_t charcode, bool* pVertGlyph) {
26 if (pVertGlyph)
27 *pVertGlyph = false;
28
29 if (charcode > 0xff)
30 return -1;
31
32 int index = m_GlyphIndex[(uint8_t)charcode];
33 return index != 0xffff ? index : -1;
34 }
35
LoadCharMetrics(int charcode)36 void CPDF_SimpleFont::LoadCharMetrics(int charcode) {
37 if (!m_Font.GetFace())
38 return;
39
40 if (charcode < 0 || charcode > 0xff) {
41 return;
42 }
43 int glyph_index = m_GlyphIndex[charcode];
44 if (glyph_index == 0xffff) {
45 if (!m_pFontFile && charcode != 32) {
46 LoadCharMetrics(32);
47 m_CharBBox[charcode] = m_CharBBox[32];
48 if (m_bUseFontWidth) {
49 m_CharWidth[charcode] = m_CharWidth[32];
50 }
51 }
52 return;
53 }
54 FXFT_Face face = m_Font.GetFace();
55 int err = FXFT_Load_Glyph(
56 face, glyph_index,
57 FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
58 if (err)
59 return;
60
61 int iHoriBearingX = FXFT_Get_Glyph_HoriBearingX(face);
62 int iHoriBearingY = FXFT_Get_Glyph_HoriBearingY(face);
63 m_CharBBox[charcode] =
64 FX_RECT(TT2PDF(iHoriBearingX, face), TT2PDF(iHoriBearingY, face),
65 TT2PDF(iHoriBearingX + FXFT_Get_Glyph_Width(face), face),
66 TT2PDF(iHoriBearingY - FXFT_Get_Glyph_Height(face), face));
67
68 if (m_bUseFontWidth) {
69 int TT_Width = TT2PDF(FXFT_Get_Glyph_HoriAdvance(face), face);
70 if (m_CharWidth[charcode] == 0xffff) {
71 m_CharWidth[charcode] = TT_Width;
72 } else if (TT_Width && !IsEmbedded()) {
73 m_CharBBox[charcode].right =
74 m_CharBBox[charcode].right * m_CharWidth[charcode] / TT_Width;
75 m_CharBBox[charcode].left =
76 m_CharBBox[charcode].left * m_CharWidth[charcode] / TT_Width;
77 }
78 }
79 }
80
GetCharWidthF(uint32_t charcode)81 int CPDF_SimpleFont::GetCharWidthF(uint32_t charcode) {
82 if (charcode > 0xff)
83 charcode = 0;
84
85 if (m_CharWidth[charcode] == 0xffff) {
86 LoadCharMetrics(charcode);
87 if (m_CharWidth[charcode] == 0xffff) {
88 m_CharWidth[charcode] = 0;
89 }
90 }
91 return m_CharWidth[charcode];
92 }
93
GetCharBBox(uint32_t charcode)94 FX_RECT CPDF_SimpleFont::GetCharBBox(uint32_t charcode) {
95 if (charcode > 0xff)
96 charcode = 0;
97
98 if (m_CharBBox[charcode].left == -1)
99 LoadCharMetrics(charcode);
100
101 return m_CharBBox[charcode];
102 }
103
LoadCommon()104 bool CPDF_SimpleFont::LoadCommon() {
105 CPDF_Dictionary* pFontDesc = m_pFontDict->GetDictFor("FontDescriptor");
106 if (pFontDesc) {
107 LoadFontDescriptor(pFontDesc);
108 }
109 CPDF_Array* pWidthArray = m_pFontDict->GetArrayFor("Widths");
110 m_bUseFontWidth = !pWidthArray;
111 if (pWidthArray) {
112 if (pFontDesc && pFontDesc->KeyExist("MissingWidth")) {
113 int MissingWidth = pFontDesc->GetIntegerFor("MissingWidth");
114 for (int i = 0; i < 256; i++) {
115 m_CharWidth[i] = MissingWidth;
116 }
117 }
118 size_t width_start = m_pFontDict->GetIntegerFor("FirstChar", 0);
119 size_t width_end = m_pFontDict->GetIntegerFor("LastChar", 0);
120 if (width_start <= 255) {
121 if (width_end == 0 || width_end >= width_start + pWidthArray->GetCount())
122 width_end = width_start + pWidthArray->GetCount() - 1;
123 if (width_end > 255)
124 width_end = 255;
125 for (size_t i = width_start; i <= width_end; i++)
126 m_CharWidth[i] = pWidthArray->GetIntegerAt(i - width_start);
127 }
128 }
129 if (m_pFontFile) {
130 if (m_BaseFont.GetLength() > 8 && m_BaseFont[7] == '+')
131 m_BaseFont = m_BaseFont.Mid(8);
132 } else {
133 LoadSubstFont();
134 }
135 if (!(m_Flags & FXFONT_SYMBOLIC))
136 m_BaseEncoding = PDFFONT_ENCODING_STANDARD;
137 CPDF_Object* pEncoding = m_pFontDict->GetDirectObjectFor("Encoding");
138 LoadPDFEncoding(pEncoding, m_BaseEncoding, &m_CharNames, !!m_pFontFile,
139 m_Font.IsTTFont());
140 LoadGlyphMap();
141 m_CharNames.clear();
142 if (!m_Font.GetFace())
143 return true;
144
145 if (m_Flags & FXFONT_ALLCAP) {
146 unsigned char kLowercases[][2] = {{'a', 'z'}, {0xe0, 0xf6}, {0xf8, 0xfd}};
147 for (size_t range = 0; range < FX_ArraySize(kLowercases); ++range) {
148 const auto& lower = kLowercases[range];
149 for (int i = lower[0]; i <= lower[1]; ++i) {
150 if (m_GlyphIndex[i] != 0xffff && m_pFontFile)
151 continue;
152
153 int j = i - 32;
154 m_GlyphIndex[i] = m_GlyphIndex[j];
155 if (m_CharWidth[j]) {
156 m_CharWidth[i] = m_CharWidth[j];
157 m_CharBBox[i] = m_CharBBox[j];
158 }
159 }
160 }
161 }
162 CheckFontMetrics();
163 return true;
164 }
165
LoadSubstFont()166 void CPDF_SimpleFont::LoadSubstFont() {
167 if (!m_bUseFontWidth && !(m_Flags & FXFONT_FIXED_PITCH)) {
168 int width = 0, i;
169 for (i = 0; i < 256; i++) {
170 if (m_CharWidth[i] == 0 || m_CharWidth[i] == 0xffff)
171 continue;
172
173 if (width == 0)
174 width = m_CharWidth[i];
175 else if (width != m_CharWidth[i])
176 break;
177 }
178 if (i == 256 && width)
179 m_Flags |= FXFONT_FIXED_PITCH;
180 }
181 pdfium::base::CheckedNumeric<int> safeStemV(m_StemV);
182 if (m_StemV < 140)
183 safeStemV *= 5;
184 else
185 safeStemV = safeStemV * 4 + 140;
186 m_Font.LoadSubst(m_BaseFont, IsTrueTypeFont(), m_Flags,
187 safeStemV.ValueOrDefault(FXFONT_FW_NORMAL), m_ItalicAngle, 0,
188 false);
189 }
190
IsUnicodeCompatible() const191 bool CPDF_SimpleFont::IsUnicodeCompatible() const {
192 return m_BaseEncoding != PDFFONT_ENCODING_BUILTIN &&
193 m_BaseEncoding != PDFFONT_ENCODING_ADOBE_SYMBOL &&
194 m_BaseEncoding != PDFFONT_ENCODING_ZAPFDINGBATS;
195 }
196
UnicodeFromCharCode(uint32_t charcode) const197 CFX_WideString CPDF_SimpleFont::UnicodeFromCharCode(uint32_t charcode) const {
198 CFX_WideString unicode = CPDF_Font::UnicodeFromCharCode(charcode);
199 if (!unicode.IsEmpty())
200 return unicode;
201 FX_WCHAR ret = m_Encoding.UnicodeFromCharCode((uint8_t)charcode);
202 if (ret == 0)
203 return CFX_WideString();
204 return ret;
205 }
206
CharCodeFromUnicode(FX_WCHAR unicode) const207 uint32_t CPDF_SimpleFont::CharCodeFromUnicode(FX_WCHAR unicode) const {
208 uint32_t ret = CPDF_Font::CharCodeFromUnicode(unicode);
209 if (ret)
210 return ret;
211 return m_Encoding.CharCodeFromUnicode(unicode);
212 }
213