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// Copyright 2016 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fpdfapi/font/cpdf_truetypefont.h"
#include <algorithm>
#include <utility>
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fxge/fx_font.h"
#include "third_party/base/cxx17_backports.h"
namespace {
constexpr uint8_t kPrefix[4] = {0x00, 0xf0, 0xf1, 0xf2};
uint16_t GetGlyphIndexForMSSymbol(FXFT_FaceRec* face, uint32_t charcode) {
for (uint8_t c : kPrefix) {
uint16_t unicode = c * 256 + charcode;
uint16_t val = FT_Get_Char_Index(face, unicode);
if (val)
return val;
}
return 0;
}
bool IsWinAnsiOrMacRomanEncoding(FontEncoding encoding) {
return encoding == FontEncoding::kWinAnsi ||
encoding == FontEncoding::kMacRoman;
}
} // namespace
CPDF_TrueTypeFont::CPDF_TrueTypeFont(CPDF_Document* pDocument,
RetainPtr<CPDF_Dictionary> pFontDict)
: CPDF_SimpleFont(pDocument, std::move(pFontDict)) {}
CPDF_TrueTypeFont::~CPDF_TrueTypeFont() = default;
bool CPDF_TrueTypeFont::IsTrueTypeFont() const {
return true;
}
const CPDF_TrueTypeFont* CPDF_TrueTypeFont::AsTrueTypeFont() const {
return this;
}
CPDF_TrueTypeFont* CPDF_TrueTypeFont::AsTrueTypeFont() {
return this;
}
bool CPDF_TrueTypeFont::Load() {
return LoadCommon();
}
void CPDF_TrueTypeFont::LoadGlyphMap() {
FXFT_FaceRec* face = m_Font.GetFaceRec();
if (!face)
return;
const FontEncoding base_encoding = DetermineEncoding();
if ((IsWinAnsiOrMacRomanEncoding(base_encoding) && m_CharNames.empty()) ||
FontStyleIsNonSymbolic(m_Flags)) {
if (!FXFT_Has_Glyph_Names(face) &&
(!face->num_charmaps || !face->charmaps)) {
SetGlyphIndicesFromFirstChar();
return;
}
const CharmapType charmap_type = DetermineCharmapType();
bool bToUnicode = m_pFontDict->KeyExist("ToUnicode");
for (uint32_t charcode = 0; charcode < 256; charcode++) {
const char* name = GetAdobeCharName(base_encoding, m_CharNames, charcode);
if (!name) {
m_GlyphIndex[charcode] =
m_pFontFile ? FT_Get_Char_Index(face, charcode) : -1;
continue;
}
m_Encoding.SetUnicode(charcode, UnicodeFromAdobeName(name));
if (charmap_type == CharmapType::kMSSymbol) {
m_GlyphIndex[charcode] = GetGlyphIndexForMSSymbol(face, charcode);
} else if (m_Encoding.UnicodeFromCharCode(charcode)) {
if (charmap_type == CharmapType::kMSUnicode) {
m_GlyphIndex[charcode] =
FT_Get_Char_Index(face, m_Encoding.UnicodeFromCharCode(charcode));
} else if (charmap_type == CharmapType::kMacRoman) {
uint32_t maccode = CharCodeFromUnicodeForFreetypeEncoding(
FT_ENCODING_APPLE_ROMAN,
m_Encoding.UnicodeFromCharCode(charcode));
if (!maccode) {
m_GlyphIndex[charcode] = FT_Get_Name_Index(face, name);
} else {
m_GlyphIndex[charcode] = FT_Get_Char_Index(face, maccode);
}
}
}
if ((m_GlyphIndex[charcode] != 0 && m_GlyphIndex[charcode] != 0xffff) ||
!name) {
continue;
}
if (strcmp(name, ".notdef") == 0) {
m_GlyphIndex[charcode] = FT_Get_Char_Index(face, 32);
continue;
}
m_GlyphIndex[charcode] = FT_Get_Name_Index(face, name);
if (m_GlyphIndex[charcode] != 0 || !bToUnicode)
continue;
WideString wsUnicode = UnicodeFromCharCode(charcode);
if (!wsUnicode.IsEmpty()) {
m_GlyphIndex[charcode] = FT_Get_Char_Index(face, wsUnicode[0]);
m_Encoding.SetUnicode(charcode, wsUnicode[0]);
}
}
return;
}
if (UseTTCharmapMSSymbol(face)) {
for (uint32_t charcode = 0; charcode < 256; charcode++)
m_GlyphIndex[charcode] = GetGlyphIndexForMSSymbol(face, charcode);
if (HasAnyGlyphIndex()) {
if (base_encoding != FontEncoding::kBuiltin) {
for (uint32_t charcode = 0; charcode < 256; charcode++) {
const char* name =
GetAdobeCharName(base_encoding, m_CharNames, charcode);
if (name)
m_Encoding.SetUnicode(charcode, UnicodeFromAdobeName(name));
}
} else if (UseTTCharmapMacRoman(face)) {
for (uint32_t charcode = 0; charcode < 256; charcode++) {
m_Encoding.SetUnicode(charcode,
UnicodeFromAppleRomanCharCode(charcode));
}
}
return;
}
}
if (UseTTCharmapMacRoman(face)) {
for (uint32_t charcode = 0; charcode < 256; charcode++) {
m_GlyphIndex[charcode] = FT_Get_Char_Index(face, charcode);
m_Encoding.SetUnicode(charcode, UnicodeFromAppleRomanCharCode(charcode));
}
if (m_pFontFile || HasAnyGlyphIndex())
return;
}
if (FXFT_Select_Charmap(face, FT_ENCODING_UNICODE) == 0) {
const uint16_t* pUnicodes = UnicodesForPredefinedCharSet(base_encoding);
for (uint32_t charcode = 0; charcode < 256; charcode++) {
if (m_pFontFile) {
m_Encoding.SetUnicode(charcode, charcode);
} else {
const char* name =
GetAdobeCharName(FontEncoding::kBuiltin, m_CharNames, charcode);
if (name)
m_Encoding.SetUnicode(charcode, UnicodeFromAdobeName(name));
else if (pUnicodes)
m_Encoding.SetUnicode(charcode, pUnicodes[charcode]);
}
m_GlyphIndex[charcode] =
FT_Get_Char_Index(face, m_Encoding.UnicodeFromCharCode(charcode));
}
if (HasAnyGlyphIndex())
return;
}
for (int charcode = 0; charcode < 256; charcode++)
m_GlyphIndex[charcode] = charcode;
}
bool CPDF_TrueTypeFont::HasAnyGlyphIndex() const {
for (uint32_t charcode = 0; charcode < kInternalTableSize; charcode++) {
if (m_GlyphIndex[charcode])
return true;
}
return false;
}
CPDF_TrueTypeFont::CharmapType CPDF_TrueTypeFont::DetermineCharmapType() const {
if (UseTTCharmapMSUnicode(m_Font.GetFaceRec()))
return CharmapType::kMSUnicode;
if (FontStyleIsNonSymbolic(m_Flags)) {
if (UseTTCharmapMacRoman(m_Font.GetFaceRec()))
return CharmapType::kMacRoman;
if (UseTTCharmapMSSymbol(m_Font.GetFaceRec()))
return CharmapType::kMSSymbol;
} else {
if (UseTTCharmapMSSymbol(m_Font.GetFaceRec()))
return CharmapType::kMSSymbol;
if (UseTTCharmapMacRoman(m_Font.GetFaceRec()))
return CharmapType::kMacRoman;
}
return CharmapType::kOther;
}
FontEncoding CPDF_TrueTypeFont::DetermineEncoding() const {
if (!m_pFontFile || !FontStyleIsSymbolic(m_Flags) ||
!IsWinAnsiOrMacRomanEncoding(m_BaseEncoding)) {
return m_BaseEncoding;
}
// Not null - caller checked.
FXFT_FaceRec* face = m_Font.GetFaceRec();
if (face->num_charmaps <= 0)
return m_BaseEncoding;
bool support_win = false;
bool support_mac = false;
for (int i = 0; i < face->num_charmaps; i++) {
int platform_id = FXFT_Get_Charmap_PlatformID(face->charmaps[i]);
if (platform_id == kNamePlatformAppleUnicode ||
platform_id == kNamePlatformWindows) {
support_win = true;
} else if (platform_id == kNamePlatformMac) {
support_mac = true;
}
if (support_win && support_mac)
break;
}
if (m_BaseEncoding == FontEncoding::kWinAnsi && !support_win)
return support_mac ? FontEncoding::kMacRoman : FontEncoding::kBuiltin;
if (m_BaseEncoding == FontEncoding::kMacRoman && !support_mac)
return support_win ? FontEncoding::kWinAnsi : FontEncoding::kBuiltin;
return m_BaseEncoding;
}
void CPDF_TrueTypeFont::SetGlyphIndicesFromFirstChar() {
int start_char = m_pFontDict->GetIntegerFor("FirstChar");
if (start_char < 0 || start_char > 255)
return;
auto* it = std::begin(m_GlyphIndex);
std::fill(it, it + start_char, 0);
uint16_t glyph = 3;
for (int charcode = start_char; charcode < 256; charcode++, glyph++)
m_GlyphIndex[charcode] = glyph;
}
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