Move CXFA_PDFFontMgr to CFGAS_PDFFontMgr

XFA bits passed into the PDFFontMgr are just used to get the
CPDF_Document and the CFGAS_FontMgr. This CL changes the code to pass
those two things into the constructor. Then, the fxfa/cxfa_pdffontmgr.*
code has been moved to fgas/cfgas_pdffontmgr.* to show it doesn't depend
on any of the XFA classes.

Change-Id: I21d791869e2a32ffedfd7c87bb3bbd035232d991
Reviewed-on: https://pdfium-review.googlesource.com/14550
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

1 files changed, 207 insertions, 0 deletions

diff --git a/xfa/fgas/font/cfgas_pdffontmgr.cpp b/xfa/fgas/font/cfgas_pdffontmgr.cpp
new file mode 100644
index 0000000000..2b8e30e5ee
--- /dev/null
+++ b/xfa/fgas/font/cfgas_pdffontmgr.cpp
@@ -0,0 +1,207 @@
+// Copyright 2017 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 "xfa/fgas/font/cfgas_pdffontmgr.h"
+
+#include <algorithm>
+
+#include "core/fpdfapi/font/cpdf_font.h"
+#include "core/fpdfapi/parser/cpdf_document.h"
+#include "xfa/fgas/font/cfgas_fontmgr.h"
+#include "xfa/fgas/font/cfgas_gefont.h"
+
+namespace {
+
+// The 5 names per entry are: PsName, Normal, Bold, Italic, BoldItalic.
+const char* const g_XFAPDFFontName[][5] = {
+    {"Adobe PI Std", "AdobePIStd", "AdobePIStd", "AdobePIStd", "AdobePIStd"},
+    {"Myriad Pro Light", "MyriadPro-Light", "MyriadPro-Semibold",
+     "MyriadPro-LightIt", "MyriadPro-SemiboldIt"},
+};
+
+}  // namespace
+
+CFGAS_PDFFontMgr::CFGAS_PDFFontMgr(CPDF_Document* pDoc, CFGAS_FontMgr* pFontMgr)
+    : m_pDoc(pDoc), m_pFontMgr(pFontMgr) {
+  ASSERT(pDoc);
+  ASSERT(pFontMgr);
+}
+
+CFGAS_PDFFontMgr::~CFGAS_PDFFontMgr() {}
+
+CFX_RetainPtr<CFGAS_GEFont> CFGAS_PDFFontMgr::FindFont(
+    const ByteString& strPsName,
+    bool bBold,
+    bool bItalic,
+    CPDF_Font** pDstPDFFont,
+    bool bStrictMatch) {
+  CPDF_Dictionary* pFontSetDict =
+      m_pDoc->GetRoot()->GetDictFor("AcroForm")->GetDictFor("DR");
+  if (!pFontSetDict)
+    return nullptr;
+
+  pFontSetDict = pFontSetDict->GetDictFor("Font");
+  if (!pFontSetDict)
+    return nullptr;
+
+  ByteString name = strPsName;
+  name.Remove(' ');
+  for (const auto& it : *pFontSetDict) {
+    const ByteString& key = it.first;
+    CPDF_Object* pObj = it.second.get();
+    if (!PsNameMatchDRFontName(name.AsStringView(), bBold, bItalic, key,
+                               bStrictMatch)) {
+      continue;
+    }
+    CPDF_Dictionary* pFontDict = ToDictionary(pObj->GetDirect());
+    if (!pFontDict || pFontDict->GetStringFor("Type") != "Font")
+      return nullptr;
+
+    CPDF_Font* pPDFFont = m_pDoc->LoadFont(pFontDict);
+    if (!pPDFFont)
+      return nullptr;
+
+    if (!pPDFFont->IsEmbedded()) {
+      *pDstPDFFont = pPDFFont;
+      return nullptr;
+    }
+    return CFGAS_GEFont::LoadFont(pPDFFont->GetFont(), m_pFontMgr.Get());
+  }
+  return nullptr;
+}
+
+CFX_RetainPtr<CFGAS_GEFont> CFGAS_PDFFontMgr::GetFont(
+    const WideStringView& wsFontFamily,
+    uint32_t dwFontStyles,
+    CPDF_Font** pPDFFont,
+    bool bStrictMatch) {
+  uint32_t dwHashCode = FX_HashCode_GetW(wsFontFamily, false);
+  ByteString strKey;
+  strKey.Format("%u%u", dwHashCode, dwFontStyles);
+  auto it = m_FontMap.find(strKey);
+  if (it != m_FontMap.end())
+    return it->second;
+
+  ByteString bsPsName = ByteString::FromUnicode(WideString(wsFontFamily));
+  bool bBold = (dwFontStyles & FX_FONTSTYLE_Bold) == FX_FONTSTYLE_Bold;
+  bool bItalic = (dwFontStyles & FX_FONTSTYLE_Italic) == FX_FONTSTYLE_Italic;
+  ByteString strFontName = PsNameToFontName(bsPsName, bBold, bItalic);
+  CFX_RetainPtr<CFGAS_GEFont> pFont =
+      FindFont(strFontName, bBold, bItalic, pPDFFont, bStrictMatch);
+  if (pFont)
+    m_FontMap[strKey] = pFont;
+
+  return pFont;
+}
+
+ByteString CFGAS_PDFFontMgr::PsNameToFontName(const ByteString& strPsName,
+                                              bool bBold,
+                                              bool bItalic) {
+  for (size_t i = 0; i < FX_ArraySize(g_XFAPDFFontName); ++i) {
+    if (strPsName == g_XFAPDFFontName[i][0]) {
+      size_t index = 1;
+      if (bBold)
+        ++index;
+      if (bItalic)
+        index += 2;
+      return g_XFAPDFFontName[i][index];
+    }
+  }
+  return strPsName;
+}
+
+bool CFGAS_PDFFontMgr::PsNameMatchDRFontName(const ByteStringView& bsPsName,
+                                             bool bBold,
+                                             bool bItalic,
+                                             const ByteString& bsDRFontName,
+                                             bool bStrictMatch) {
+  ByteString bsDRName = bsDRFontName;
+  bsDRName.Remove('-');
+  FX_STRSIZE iPsLen = bsPsName.GetLength();
+  auto nIndex = bsDRName.Find(bsPsName);
+  if (nIndex.has_value() && !bStrictMatch)
+    return true;
+
+  if (!nIndex.has_value() || nIndex.value() != 0)
+    return false;
+
+  FX_STRSIZE iDifferLength = bsDRName.GetLength() - iPsLen;
+  if (iDifferLength > 1 || (bBold || bItalic)) {
+    auto iBoldIndex = bsDRName.Find("Bold");
+    if (bBold != iBoldIndex.has_value())
+      return false;
+
+    if (iBoldIndex.has_value()) {
+      iDifferLength = std::min(iDifferLength - 4,
+                               bsDRName.GetLength() - iBoldIndex.value() - 4);
+    }
+    bool bItalicFont = true;
+    if (bsDRName.Contains("Italic"))
+      iDifferLength -= 6;
+    else if (bsDRName.Contains("It"))
+      iDifferLength -= 2;
+    else if (bsDRName.Contains("Oblique"))
+      iDifferLength -= 7;
+    else
+      bItalicFont = false;
+
+    if (bItalic != bItalicFont)
+      return false;
+
+    if (iDifferLength > 1) {
+      ByteString bsDRTailer = bsDRName.Right(iDifferLength);
+      if (bsDRTailer == "MT" || bsDRTailer == "PSMT" ||
+          bsDRTailer == "Regular" || bsDRTailer == "Reg") {
+        return true;
+      }
+      if (iBoldIndex.has_value() || bItalicFont)
+        return false;
+
+      bool bMatch = false;
+      switch (bsPsName[iPsLen - 1]) {
+        case 'L':
+          if (bsDRName.Right(5) == "Light")
+            bMatch = true;
+
+          break;
+        case 'R':
+          if (bsDRName.Right(7) == "Regular" || bsDRName.Right(3) == "Reg")
+            bMatch = true;
+
+          break;
+        case 'M':
+          if (bsDRName.Right(5) == "Medium")
+            bMatch = true;
+          break;
+        default:
+          break;
+      }
+      return bMatch;
+    }
+  }
+  return true;
+}
+
+bool CFGAS_PDFFontMgr::GetCharWidth(const CFX_RetainPtr<CFGAS_GEFont>& pFont,
+                                    wchar_t wUnicode,
+                                    bool bCharCode,
+                                    int32_t* pWidth) {
+  if (wUnicode != 0x20 || bCharCode)
+    return false;
+
+  auto it = m_FDE2PDFFont.find(pFont);
+  if (it == m_FDE2PDFFont.end())
+    return false;
+
+  CPDF_Font* pPDFFont = it->second;
+  *pWidth = pPDFFont->GetCharWidthF(pPDFFont->CharCodeFromUnicode(wUnicode));
+  return true;
+}
+
+void CFGAS_PDFFontMgr::SetFont(const CFX_RetainPtr<CFGAS_GEFont>& pFont,
+                               CPDF_Font* pPDFFont) {
+  m_FDE2PDFFont[pFont] = pPDFFont;
+}