Move core/fpdfapi/fpdf_font to core/fpdfapi/font

BUG=pdfium:603

Review-Url: https://codereview.chromium.org/2392773003

1 files changed, 476 insertions, 0 deletions

diff --git a/core/fpdfapi/font/cpdf_font.cpp b/core/fpdfapi/font/cpdf_font.cpp
new file mode 100644
index 0000000000..945681fc9d
--- /dev/null
+++ b/core/fpdfapi/font/cpdf_font.cpp
@@ -0,0 +1,476 @@
+// 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 <memory>
+#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/font/font_int.h"
+#include "core/fpdfapi/fpdf_page/cpdf_pagemodule.h"
+#include "core/fpdfapi/fpdf_page/pageint.h"
+#include "core/fpdfapi/fpdf_parser/cpdf_array.h"
+#include "core/fpdfapi/fpdf_parser/cpdf_dictionary.h"
+#include "core/fpdfapi/fpdf_parser/cpdf_document.h"
+#include "core/fpdfapi/fpdf_parser/cpdf_name.h"
+#include "core/fpdfapi/fpdf_parser/cpdf_stream_acc.h"
+#include "core/fxcrt/fx_memory.h"
+#include "core/fxge/fx_freetype.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) {
+    m_pDocument->GetPageData()->ReleaseFontFileStreamAcc(
+        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 FX_CHAR* pString, int size) const {
+  return size;
+}
+
+int CPDF_Font::GetCharSize(uint32_t charcode) const {
+  return 1;
+}
+
+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(FX_CHAR* buf, uint32_t charcode) const {
+  *buf = static_cast<FX_CHAR>(charcode);
+  return 1;
+}
+
+void CPDF_Font::AppendChar(CFX_ByteString& str, uint32_t charcode) const {
+  char buf[4];
+  int len = AppendChar(buf, charcode);
+  if (len == 1) {
+    str += buf[0];
+  } else {
+    str += CFX_ByteString(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(FX_WCHAR unicode) const {
+  if (!m_bToUnicodeLoaded)
+    LoadUnicodeMap();
+
+  return m_pToUnicodeMap ? m_pToUnicodeMap->ReverseLookup(unicode) : 0;
+}
+
+void CPDF_Font::LoadFontDescriptor(CPDF_Dictionary* pFontDesc) {
+  m_Flags = pFontDesc->GetIntegerFor("Flags", PDFFONT_NONSYMBOLIC);
+  int ItalicAngle = 0;
+  FX_BOOL bExistItalicAngle = FALSE;
+  if (pFontDesc->KeyExist("ItalicAngle")) {
+    ItalicAngle = pFontDesc->GetIntegerFor("ItalicAngle");
+    bExistItalicAngle = TRUE;
+  }
+  if (ItalicAngle < 0) {
+    m_Flags |= PDFFONT_ITALIC;
+    m_ItalicAngle = ItalicAngle;
+  }
+  FX_BOOL bExistStemV = FALSE;
+  if (pFontDesc->KeyExist("StemV")) {
+    m_StemV = pFontDesc->GetIntegerFor("StemV");
+    bExistStemV = TRUE;
+  }
+  FX_BOOL bExistAscent = FALSE;
+  if (pFontDesc->KeyExist("Ascent")) {
+    m_Ascent = pFontDesc->GetIntegerFor("Ascent");
+    bExistAscent = TRUE;
+  }
+  FX_BOOL bExistDescent = FALSE;
+  if (pFontDesc->KeyExist("Descent")) {
+    m_Descent = pFontDesc->GetIntegerFor("Descent");
+    bExistDescent = TRUE;
+  }
+  FX_BOOL bExistCapHeight = FALSE;
+  if (pFontDesc->KeyExist("CapHeight")) {
+    bExistCapHeight = TRUE;
+  }
+  if (bExistItalicAngle && bExistAscent && bExistCapHeight && bExistDescent &&
+      bExistStemV) {
+    m_Flags |= PDFFONT_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()->ReleaseFontFileStreamAcc(
+        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 {
+      FX_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.reset(new CPDF_ToUnicodeMap);
+  m_pToUnicodeMap->Load(pStream);
+}
+
+int CPDF_Font::GetStringWidth(const FX_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;
+}
+
+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->SetNameFor("Type", "Font");
+  pDict->SetNameFor("Subtype", "Type1");
+  pDict->SetNameFor("BaseFont", fontname);
+  pDict->SetNameFor("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.reset(new CPDF_CIDFont);
+        break;
+      }
+    }
+    if (!pFont)
+      pFont.reset(new CPDF_TrueTypeFont);
+  } else if (type == "Type3") {
+    pFont.reset(new CPDF_Type3Font);
+  } else if (type == "Type0") {
+    pFont.reset(new CPDF_CIDFont);
+  } else {
+    pFont.reset(new CPDF_Type1Font);
+  }
+  pFont->m_pFontDict = pFontDict;
+  pFont->m_pDocument = pDoc;
+  pFont->m_BaseFont = pFontDict->GetStringFor("BaseFont");
+  return pFont->Load() ? std::move(pFont) : std::unique_ptr<CPDF_Font>();
+}
+
+uint32_t CPDF_Font::GetNextChar(const FX_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 & PDFFONT_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 FX_CHAR* CPDF_Font::GetAdobeCharName(
+    int iBaseEncoding,
+    const std::vector<CFX_ByteString>& charnames,
+    int charcode) {
+  if (charcode < 0 || charcode >= 256) {
+    ASSERT(false);
+    return nullptr;
+  }
+
+  if (!charnames.empty() && !charnames[charcode].IsEmpty())
+    return charnames[charcode].c_str();
+
+  const FX_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 (fallbackFont < 0 ||
+      fallbackFont >= pdfium::CollectionSize<int>(m_FontFallbacks)) {
+    return -1;
+  }
+  int glyph =
+      FXFT_Get_Char_Index(m_FontFallbacks[fallbackFont]->GetFace(), charcode);
+  if (glyph == 0 || glyph == 0xffff)
+    return -1;
+  return glyph;
+}