refactor CPDF_Font and subclasses

core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp

 // Copyright 2014 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/src/fpdfapi/fpdf_page/pageint.h"
 
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_page.h"
@@ skipping 1240 matching lines @@
 }
 
 CPDF_Font* CPDF_StreamContentParser::FindFont(const CFX_ByteString& name) {
   CPDF_Dictionary* pFontDict = ToDictionary(FindResourceObj("Font", name));
   if (!pFontDict) {
     m_bResourceMissing = TRUE;
     return CPDF_Font::GetStockFont(m_pDocument, "Helvetica");
   }
 
   CPDF_Font* pFont = m_pDocument->LoadFont(pFontDict);
-  if (pFont && pFont->GetType3Font()) {
-    pFont->GetType3Font()->SetPageResources(m_pResources);
-    pFont->GetType3Font()->CheckType3FontMetrics();
+  if (pFont && pFont->IsType3Font()) {
+    pFont->AsType3Font()->SetPageResources(m_pResources);
+    pFont->AsType3Font()->CheckType3FontMetrics();
   }
   return pFont;
 }
 
 CPDF_ColorSpace* CPDF_StreamContentParser::FindColorSpace(
     const CFX_ByteString& name) {
   if (name == "Pattern") {
     return CPDF_ColorSpace::GetStockCS(PDFCS_PATTERN);
   }
   if (name == "DeviceGray" || name == "DeviceCMYK" || name == "DeviceRGB") {
@@ skipping 55 matching lines @@
           (fInitKerning * m_pCurStates->m_TextState.GetFontSize()) / 1000;
     } else {
       m_pCurStates->m_TextY -=
           (fInitKerning * m_pCurStates->m_TextState.GetFontSize()) / 1000;
     }
   }
   if (nsegs == 0) {
     return;
   }
   int textmode;
-  if (pFont->GetFontType() == PDFFONT_TYPE3) {
+  if (pFont->IsType3Font()) {
     textmode = 0;
   } else {
     textmode = m_pCurStates->m_TextState.GetObject()->m_TextMode;
   }
   {
     std::unique_ptr<CPDF_TextObject> pText(new CPDF_TextObject);
     m_pLastTextObject = pText.get();
     SetGraphicStates(m_pLastTextObject, TRUE, TRUE, TRUE);
     if (textmode && textmode != 3 && textmode != 4 && textmode != 7) {
       FX_FLOAT* pCTM = pText->m_TextState.GetModify()->m_CTM;
@@ skipping 435 matching lines @@
         } else {
           PDF_ReplaceAbbr(pElement);
         }
       }
       break;
     }
     default:
       break;
   }
 }