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// Copyright 2016 PDFium Authors. All rights reserved.
// 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_font.h"
#include <limits>
#include <memory>
#include <utility>
#include <vector>
#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/font/cpdf_fontencoding.h"
#include "core/fpdfapi/font/cpdf_truetypefont.h"
#include "core/fpdfapi/font/cpdf_type1font.h"
#include "core/fpdfapi/font/cpdf_type3font.h"
#include "core/fpdfapi/page/cpdf_docpagedata.h"
#include "core/fpdfapi/page/cpdf_pagemodule.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fxcrt/fx_memory.h"
#include "core/fxge/fx_freetype.h"
#include "third_party/base/logging.h"
#include "third_party/base/ptr_util.h"
#include "third_party/base/stl_util.h"
namespace {
const uint8_t kChineseFontNames[][5] = {{0xCB, 0xCE, 0xCC, 0xE5, 0x00},
{0xBF, 0xAC, 0xCC, 0xE5, 0x00},
{0xBA, 0xDA, 0xCC, 0xE5, 0x00},
{0xB7, 0xC2, 0xCB, 0xCE, 0x00},
{0xD0, 0xC2, 0xCB, 0xCE, 0x00}};
void GetPredefinedEncoding(const CFX_ByteString& value, int* basemap) {
if (value == "WinAnsiEncoding")
*basemap = PDFFONT_ENCODING_WINANSI;
else if (value == "MacRomanEncoding")
*basemap = PDFFONT_ENCODING_MACROMAN;
else if (value == "MacExpertEncoding")
*basemap = PDFFONT_ENCODING_MACEXPERT;
else if (value == "PDFDocEncoding")
*basemap = PDFFONT_ENCODING_PDFDOC;
}
} // namespace
CPDF_Font::CPDF_Font()
: m_pFontFile(nullptr),
m_pFontDict(nullptr),
m_bToUnicodeLoaded(false),
m_Flags(0),
m_StemV(0),
m_Ascent(0),
m_Descent(0),
m_ItalicAngle(0) {}
CPDF_Font::~CPDF_Font() {
if (m_pFontFile) {
auto* pPageData = m_pDocument->GetPageData();
if (pPageData) {
pPageData->MaybePurgeFontFileStreamAcc(
m_pFontFile->GetStream()->AsStream());
}
}
}
bool CPDF_Font::IsType1Font() const {
return false;
}
bool CPDF_Font::IsTrueTypeFont() const {
return false;
}
bool CPDF_Font::IsType3Font() const {
return false;
}
bool CPDF_Font::IsCIDFont() const {
return false;
}
const CPDF_Type1Font* CPDF_Font::AsType1Font() const {
return nullptr;
}
CPDF_Type1Font* CPDF_Font::AsType1Font() {
return nullptr;
}
const CPDF_TrueTypeFont* CPDF_Font::AsTrueTypeFont() const {
return nullptr;
}
CPDF_TrueTypeFont* CPDF_Font::AsTrueTypeFont() {
return nullptr;
}
const CPDF_Type3Font* CPDF_Font::AsType3Font() const {
return nullptr;
}
CPDF_Type3Font* CPDF_Font::AsType3Font() {
return nullptr;
}
const CPDF_CIDFont* CPDF_Font::AsCIDFont() const {
return nullptr;
}
CPDF_CIDFont* CPDF_Font::AsCIDFont() {
return nullptr;
}
bool CPDF_Font::IsUnicodeCompatible() const {
return false;
}
int CPDF_Font::CountChar(const char* pString, int size) const {
return size;
}
int CPDF_Font::GlyphFromCharCodeExt(uint32_t charcode) {
return GlyphFromCharCode(charcode, nullptr);
}
bool CPDF_Font::IsVertWriting() const {
const CPDF_CIDFont* pCIDFont = AsCIDFont();
return pCIDFont ? pCIDFont->IsVertWriting() : m_Font.IsVertical();
}
int CPDF_Font::AppendChar(char* buf, uint32_t charcode) const {
*buf = static_cast<char>(charcode);
return 1;
}
void CPDF_Font::AppendChar(CFX_ByteString* str, uint32_t charcode) const {
char buf[4];
int len = AppendChar(buf, charcode);
*str += CFX_ByteStringC(buf, len);
}
CFX_WideString CPDF_Font::UnicodeFromCharCode(uint32_t charcode) const {
if (!m_bToUnicodeLoaded)
LoadUnicodeMap();
return m_pToUnicodeMap ? m_pToUnicodeMap->Lookup(charcode) : CFX_WideString();
}
uint32_t CPDF_Font::CharCodeFromUnicode(wchar_t unicode) const {
if (!m_bToUnicodeLoaded)
LoadUnicodeMap();
return m_pToUnicodeMap ? m_pToUnicodeMap->ReverseLookup(unicode) : 0;
}
bool CPDF_Font::HasFontWidths() const {
return true;
}
void CPDF_Font::LoadFontDescriptor(CPDF_Dictionary* pFontDesc) {
m_Flags = pFontDesc->GetIntegerFor("Flags", FXFONT_NONSYMBOLIC);
int ItalicAngle = 0;
bool bExistItalicAngle = false;
if (pFontDesc->KeyExist("ItalicAngle")) {
ItalicAngle = pFontDesc->GetIntegerFor("ItalicAngle");
bExistItalicAngle = true;
}
if (ItalicAngle < 0) {
m_Flags |= FXFONT_ITALIC;
m_ItalicAngle = ItalicAngle;
}
bool bExistStemV = false;
if (pFontDesc->KeyExist("StemV")) {
m_StemV = pFontDesc->GetIntegerFor("StemV");
bExistStemV = true;
}
bool bExistAscent = false;
if (pFontDesc->KeyExist("Ascent")) {
m_Ascent = pFontDesc->GetIntegerFor("Ascent");
bExistAscent = true;
}
bool bExistDescent = false;
if (pFontDesc->KeyExist("Descent")) {
m_Descent = pFontDesc->GetIntegerFor("Descent");
bExistDescent = true;
}
bool bExistCapHeight = false;
if (pFontDesc->KeyExist("CapHeight"))
bExistCapHeight = true;
if (bExistItalicAngle && bExistAscent && bExistCapHeight && bExistDescent &&
bExistStemV) {
m_Flags |= FXFONT_USEEXTERNATTR;
}
if (m_Descent > 10)
m_Descent = -m_Descent;
CPDF_Array* pBBox = pFontDesc->GetArrayFor("FontBBox");
if (pBBox) {
m_FontBBox.left = pBBox->GetIntegerAt(0);
m_FontBBox.bottom = pBBox->GetIntegerAt(1);
m_FontBBox.right = pBBox->GetIntegerAt(2);
m_FontBBox.top = pBBox->GetIntegerAt(3);
}
CPDF_Stream* pFontFile = pFontDesc->GetStreamFor("FontFile");
if (!pFontFile)
pFontFile = pFontDesc->GetStreamFor("FontFile2");
if (!pFontFile)
pFontFile = pFontDesc->GetStreamFor("FontFile3");
if (!pFontFile)
return;
m_pFontFile = m_pDocument->LoadFontFile(pFontFile);
if (!m_pFontFile)
return;
const uint8_t* pFontData = m_pFontFile->GetData();
uint32_t dwFontSize = m_pFontFile->GetSize();
if (!m_Font.LoadEmbedded(pFontData, dwFontSize)) {
m_pDocument->GetPageData()->MaybePurgeFontFileStreamAcc(
m_pFontFile->GetStream()->AsStream());
m_pFontFile = nullptr;
}
}
void CPDF_Font::CheckFontMetrics() {
if (m_FontBBox.top == 0 && m_FontBBox.bottom == 0 && m_FontBBox.left == 0 &&
m_FontBBox.right == 0) {
FXFT_Face face = m_Font.GetFace();
if (face) {
m_FontBBox.left = TT2PDF(FXFT_Get_Face_xMin(face), face);
m_FontBBox.bottom = TT2PDF(FXFT_Get_Face_yMin(face), face);
m_FontBBox.right = TT2PDF(FXFT_Get_Face_xMax(face), face);
m_FontBBox.top = TT2PDF(FXFT_Get_Face_yMax(face), face);
m_Ascent = TT2PDF(FXFT_Get_Face_Ascender(face), face);
m_Descent = TT2PDF(FXFT_Get_Face_Descender(face), face);
} else {
bool bFirst = true;
for (int i = 0; i < 256; i++) {
FX_RECT rect = GetCharBBox(i);
if (rect.left == rect.right) {
continue;
}
if (bFirst) {
m_FontBBox = rect;
bFirst = false;
} else {
if (m_FontBBox.top < rect.top) {
m_FontBBox.top = rect.top;
}
if (m_FontBBox.right < rect.right) {
m_FontBBox.right = rect.right;
}
if (m_FontBBox.left > rect.left) {
m_FontBBox.left = rect.left;
}
if (m_FontBBox.bottom > rect.bottom) {
m_FontBBox.bottom = rect.bottom;
}
}
}
}
}
if (m_Ascent == 0 && m_Descent == 0) {
FX_RECT rect = GetCharBBox('A');
m_Ascent = rect.bottom == rect.top ? m_FontBBox.top : rect.top;
rect = GetCharBBox('g');
m_Descent = rect.bottom == rect.top ? m_FontBBox.bottom : rect.bottom;
}
}
void CPDF_Font::LoadUnicodeMap() const {
m_bToUnicodeLoaded = true;
CPDF_Stream* pStream = m_pFontDict->GetStreamFor("ToUnicode");
if (!pStream) {
return;
}
m_pToUnicodeMap = pdfium::MakeUnique<CPDF_ToUnicodeMap>();
m_pToUnicodeMap->Load(pStream);
}
int CPDF_Font::GetStringWidth(const char* pString, int size) {
int offset = 0;
int width = 0;
while (offset < size) {
uint32_t charcode = GetNextChar(pString, size, offset);
width += GetCharWidthF(charcode);
}
return width;
}
// static
CPDF_Font* CPDF_Font::GetStockFont(CPDF_Document* pDoc,
const CFX_ByteStringC& name) {
CFX_ByteString fontname(name);
int font_id = PDF_GetStandardFontName(&fontname);
if (font_id < 0)
return nullptr;
CPDF_FontGlobals* pFontGlobals =
CPDF_ModuleMgr::Get()->GetPageModule()->GetFontGlobals();
CPDF_Font* pFont = pFontGlobals->Find(pDoc, font_id);
if (pFont)
return pFont;
CPDF_Dictionary* pDict = new CPDF_Dictionary(pDoc->GetByteStringPool());
pDict->SetNewFor<CPDF_Name>("Type", "Font");
pDict->SetNewFor<CPDF_Name>("Subtype", "Type1");
pDict->SetNewFor<CPDF_Name>("BaseFont", fontname);
pDict->SetNewFor<CPDF_Name>("Encoding", "WinAnsiEncoding");
return pFontGlobals->Set(pDoc, font_id, CPDF_Font::Create(nullptr, pDict));
}
std::unique_ptr<CPDF_Font> CPDF_Font::Create(CPDF_Document* pDoc,
CPDF_Dictionary* pFontDict) {
CFX_ByteString type = pFontDict->GetStringFor("Subtype");
std::unique_ptr<CPDF_Font> pFont;
if (type == "TrueType") {
CFX_ByteString tag = pFontDict->GetStringFor("BaseFont").Left(4);
for (size_t i = 0; i < FX_ArraySize(kChineseFontNames); ++i) {
if (tag == CFX_ByteString(kChineseFontNames[i], 4)) {
CPDF_Dictionary* pFontDesc = pFontDict->GetDictFor("FontDescriptor");
if (!pFontDesc || !pFontDesc->KeyExist("FontFile2"))
pFont = pdfium::MakeUnique<CPDF_CIDFont>();
break;
}
}
if (!pFont)
pFont = pdfium::MakeUnique<CPDF_TrueTypeFont>();
} else if (type == "Type3") {
pFont = pdfium::MakeUnique<CPDF_Type3Font>();
} else if (type == "Type0") {
pFont = pdfium::MakeUnique<CPDF_CIDFont>();
} else {
pFont = pdfium::MakeUnique<CPDF_Type1Font>();
}
pFont->m_pFontDict = pFontDict;
pFont->m_pDocument = pDoc;
pFont->m_BaseFont = pFontDict->GetStringFor("BaseFont");
return pFont->Load() ? std::move(pFont) : nullptr;
}
uint32_t CPDF_Font::GetNextChar(const char* pString,
int nStrLen,
int& offset) const {
if (offset < 0 || nStrLen < 1) {
return 0;
}
uint8_t ch = offset < nStrLen ? pString[offset++] : pString[nStrLen - 1];
return static_cast<uint32_t>(ch);
}
void CPDF_Font::LoadPDFEncoding(CPDF_Object* pEncoding,
int& iBaseEncoding,
std::vector<CFX_ByteString>* pCharNames,
bool bEmbedded,
bool bTrueType) {
if (!pEncoding) {
if (m_BaseFont == "Symbol") {
iBaseEncoding = bTrueType ? PDFFONT_ENCODING_MS_SYMBOL
: PDFFONT_ENCODING_ADOBE_SYMBOL;
} else if (!bEmbedded && iBaseEncoding == PDFFONT_ENCODING_BUILTIN) {
iBaseEncoding = PDFFONT_ENCODING_WINANSI;
}
return;
}
if (pEncoding->IsName()) {
if (iBaseEncoding == PDFFONT_ENCODING_ADOBE_SYMBOL ||
iBaseEncoding == PDFFONT_ENCODING_ZAPFDINGBATS) {
return;
}
if ((m_Flags & FXFONT_SYMBOLIC) && m_BaseFont == "Symbol") {
if (!bTrueType)
iBaseEncoding = PDFFONT_ENCODING_ADOBE_SYMBOL;
return;
}
CFX_ByteString bsEncoding = pEncoding->GetString();
if (bsEncoding.Compare("MacExpertEncoding") == 0) {
bsEncoding = "WinAnsiEncoding";
}
GetPredefinedEncoding(bsEncoding, &iBaseEncoding);
return;
}
CPDF_Dictionary* pDict = pEncoding->AsDictionary();
if (!pDict)
return;
if (iBaseEncoding != PDFFONT_ENCODING_ADOBE_SYMBOL &&
iBaseEncoding != PDFFONT_ENCODING_ZAPFDINGBATS) {
CFX_ByteString bsEncoding = pDict->GetStringFor("BaseEncoding");
if (bsEncoding.Compare("MacExpertEncoding") == 0 && bTrueType) {
bsEncoding = "WinAnsiEncoding";
}
GetPredefinedEncoding(bsEncoding, &iBaseEncoding);
}
if ((!bEmbedded || bTrueType) && iBaseEncoding == PDFFONT_ENCODING_BUILTIN)
iBaseEncoding = PDFFONT_ENCODING_STANDARD;
CPDF_Array* pDiffs = pDict->GetArrayFor("Differences");
if (!pDiffs)
return;
pCharNames->resize(256);
uint32_t cur_code = 0;
for (uint32_t i = 0; i < pDiffs->GetCount(); i++) {
CPDF_Object* pElement = pDiffs->GetDirectObjectAt(i);
if (!pElement)
continue;
if (CPDF_Name* pName = pElement->AsName()) {
if (cur_code < 256)
(*pCharNames)[cur_code] = pName->GetString();
cur_code++;
} else {
cur_code = pElement->GetInteger();
}
}
}
bool CPDF_Font::IsStandardFont() const {
if (!IsType1Font())
return false;
if (m_pFontFile)
return false;
if (AsType1Font()->GetBase14Font() < 0)
return false;
return true;
}
const char* CPDF_Font::GetAdobeCharName(
int iBaseEncoding,
const std::vector<CFX_ByteString>& charnames,
int charcode) {
if (charcode < 0 || charcode >= 256) {
NOTREACHED();
return nullptr;
}
if (!charnames.empty() && !charnames[charcode].IsEmpty())
return charnames[charcode].c_str();
const char* name = nullptr;
if (iBaseEncoding)
name = PDF_CharNameFromPredefinedCharSet(iBaseEncoding, charcode);
return name && name[0] ? name : nullptr;
}
uint32_t CPDF_Font::FallbackFontFromCharcode(uint32_t charcode) {
if (m_FontFallbacks.empty()) {
m_FontFallbacks.push_back(pdfium::MakeUnique<CFX_Font>());
m_FontFallbacks[0]->LoadSubst("Arial", IsTrueTypeFont(), m_Flags,
m_StemV * 5, m_ItalicAngle, 0,
IsVertWriting());
}
return 0;
}
int CPDF_Font::FallbackGlyphFromCharcode(int fallbackFont, uint32_t charcode) {
if (!pdfium::IndexInBounds(m_FontFallbacks, fallbackFont))
return -1;
CFX_WideString str = UnicodeFromCharCode(charcode);
uint32_t unicode = !str.IsEmpty() ? str.GetAt(0) : charcode;
int glyph =
FXFT_Get_Char_Index(m_FontFallbacks[fallbackFont]->GetFace(), unicode);
if (glyph == 0)
return -1;
return glyph;
}
CFX_Font* CPDF_Font::GetFontFallback(int position) {
if (position < 0 || static_cast<size_t>(position) >= m_FontFallbacks.size())
return nullptr;
return m_FontFallbacks[position].get();
}
// static
int CPDF_Font::TT2PDF(int m, FXFT_Face face) {
int upm = FXFT_Get_Face_UnitsPerEM(face);
if (upm == 0)
return m;
return static_cast<int>(
pdfium::clamp((m * 1000.0 + upm / 2) / upm,
static_cast<double>(std::numeric_limits<int>::min()),
static_cast<double>(std::numeric_limits<int>::max())));
}
// static
bool CPDF_Font::FT_UseTTCharmap(FXFT_Face face,
int platform_id,
int encoding_id) {
auto** pCharMap = FXFT_Get_Face_Charmaps(face);
for (int i = 0; i < FXFT_Get_Face_CharmapCount(face); i++) {
if (FXFT_Get_Charmap_PlatformID(pCharMap[i]) == platform_id &&
FXFT_Get_Charmap_EncodingID(pCharMap[i]) == encoding_id) {
FXFT_Set_Charmap(face, pCharMap[i]);
return true;
}
}
return false;
}