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authordsinclair <dsinclair@chromium.org>2016-10-04 11:08:49 -0700
committerCommit bot <commit-bot@chromium.org>2016-10-04 11:08:49 -0700
commitbc5e6d289ed40efec2b0e03427e8fc2947bf53e3 (patch)
treefa1509c1fe1a46a6ebe8861768804883041973be /core/fpdfapi/font/cpdf_font.cpp
parent241543581696e996093bf0c2ae09ece6afe13ba2 (diff)
downloadpdfium-bc5e6d289ed40efec2b0e03427e8fc2947bf53e3.tar.xz
Move core/fpdfapi/fpdf_font to core/fpdfapi/font
BUG=pdfium:603 Review-Url: https://codereview.chromium.org/2392773003
Diffstat (limited to 'core/fpdfapi/font/cpdf_font.cpp')
-rw-r--r--core/fpdfapi/font/cpdf_font.cpp476
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;
+}