refactor CPDF_Font and subclasses

core/src/fpdfapi/fpdf_page/fpdf_page.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 <algorithm>
 
@@ skipping 53 matching lines @@
 
 void CPDF_TextObject::GetItemInfo(int index, CPDF_TextObjectItem* pInfo) const {
   pInfo->m_CharCode =
       m_nChars == 1 ? (FX_DWORD)(uintptr_t)m_pCharCodes : m_pCharCodes[index];
   pInfo->m_OriginX = index ? m_pCharPos[index - 1] : 0;
   pInfo->m_OriginY = 0;
   if (pInfo->m_CharCode == -1) {
     return;
   }
   CPDF_Font* pFont = m_TextState.GetFont();
-  if (pFont->GetFontType() != PDFFONT_CIDFONT) {
+  if (!pFont->IsCIDFont()) {
     return;
   }
-  if (!((CPDF_CIDFont*)pFont)->IsVertWriting()) {
+  if (!pFont->AsCIDFont()->IsVertWriting()) {
     return;
   }
-  FX_WORD CID = ((CPDF_CIDFont*)pFont)->CIDFromCharCode(pInfo->m_CharCode);
+  FX_WORD CID = pFont->AsCIDFont()->CIDFromCharCode(pInfo->m_CharCode);
   pInfo->m_OriginY = pInfo->m_OriginX;
   pInfo->m_OriginX = 0;
   short vx, vy;
-  ((CPDF_CIDFont*)pFont)->GetVertOrigin(CID, vx, vy);
+  pFont->AsCIDFont()->GetVertOrigin(CID, vx, vy);
   FX_FLOAT fontsize = m_TextState.GetFontSize();
   pInfo->m_OriginX -= fontsize * vx / 1000;
   pInfo->m_OriginY -= fontsize * vy / 1000;
 }
 
 int CPDF_TextObject::CountChars() const {
   if (m_nChars == 1) {
     return 1;
   }
   int count = 0;
@@ skipping 112 matching lines @@
 
 void CPDF_TextObject::SetText(const CFX_ByteString& str) {
   SetSegments(&str, nullptr, 1);
   RecalcPositionData();
 }
 
 FX_FLOAT CPDF_TextObject::GetCharWidth(FX_DWORD charcode) const {
   FX_FLOAT fontsize = m_TextState.GetFontSize() / 1000;
   CPDF_Font* pFont = m_TextState.GetFont();
   FX_BOOL bVertWriting = FALSE;
-  CPDF_CIDFont* pCIDFont = pFont->GetCIDFont();
+  CPDF_CIDFont* pCIDFont = pFont->AsCIDFont();
   if (pCIDFont) {
     bVertWriting = pCIDFont->IsVertWriting();
   }
   if (!bVertWriting)
     return pFont->GetCharWidthF(charcode, 0) * fontsize;
 
   FX_WORD CID = pCIDFont->CIDFromCharCode(charcode);
   return pCIDFont->GetVertWidth(CID) * fontsize;
 }
 
 void CPDF_TextObject::CalcPositionData(FX_FLOAT* pTextAdvanceX,
                                        FX_FLOAT* pTextAdvanceY,
                                        FX_FLOAT horz_scale,
                                        int level) {
   FX_FLOAT curpos = 0;
   FX_FLOAT min_x = 10000 * 1.0f;
   FX_FLOAT max_x = -10000 * 1.0f;
   FX_FLOAT min_y = 10000 * 1.0f;
   FX_FLOAT max_y = -10000 * 1.0f;
   CPDF_Font* pFont = m_TextState.GetFont();
   FX_BOOL bVertWriting = FALSE;
-  CPDF_CIDFont* pCIDFont = pFont->GetCIDFont();
+  CPDF_CIDFont* pCIDFont = pFont->AsCIDFont();
   if (pCIDFont) {
     bVertWriting = pCIDFont->IsVertWriting();
   }
   FX_FLOAT fontsize = m_TextState.GetFontSize();
   for (int i = 0; i < m_nChars; ++i) {
     FX_DWORD charcode =
         m_nChars == 1 ? (FX_DWORD)(uintptr_t)m_pCharCodes : m_pCharCodes[i];
     if (i > 0) {
       if (charcode == (FX_DWORD)-1) {
         curpos -= (m_pCharPos[i - 1] * fontsize) / 1000;
@@ skipping 509 matching lines @@
   matrix = m_PageMatrix;
   matrix.Concat(display_matrix);
 }
 
 CPDF_ParseOptions::CPDF_ParseOptions() {
   m_bTextOnly = FALSE;
   m_bMarkedContent = TRUE;
   m_bSeparateForm = TRUE;
   m_bDecodeInlineImage = FALSE;
 }