Add type cast definitions for CPDF_Stream.

core/src/fpdfdoc/doc_annot.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 "../../../third_party/base/nonstd_unique_ptr.h"
 #include "../../include/fpdfdoc/fpdf_doc.h"
 #include "../../include/fpdfapi/fpdf_pageobj.h"
 
@@ skipping 169 matching lines @@
   return m_pAnnotDict;
 }
 
 CPDF_Stream* FPDFDOC_GetAnnotAP(CPDF_Dictionary* pAnnotDict,
                                 CPDF_Annot::AppearanceMode mode) {
   CPDF_Dictionary* pAP = pAnnotDict->GetDict("AP");
   if (pAP == NULL) {
     return NULL;
   }
   const FX_CHAR* ap_entry = "N";
-  if (mode == CPDF_Annot::Down) {
+  if (mode == CPDF_Annot::Down)
     ap_entry = "D";
-  } else if (mode == CPDF_Annot::Rollover) {
+  else if (mode == CPDF_Annot::Rollover)
     ap_entry = "R";
-  }
-  if (!pAP->KeyExist(ap_entry)) {
+  if (!pAP->KeyExist(ap_entry))
     ap_entry = "N";
-  }
+
   CPDF_Object* psub = pAP->GetElementValue(ap_entry);
-  if (psub == NULL) {
-    return NULL;
-  }
-  CPDF_Stream* pStream = NULL;
-  if (psub->GetType() == PDFOBJ_STREAM) {
-    pStream = (CPDF_Stream*)psub;
-  } else if (CPDF_Dictionary* pDict = psub->AsDictionary()) {
+  if (!psub)
+    return nullptr;
+  if (CPDF_Stream* pStream = psub->AsStream())
+    return pStream;
+
+  if (CPDF_Dictionary* pDict = psub->AsDictionary()) {
     CFX_ByteString as = pAnnotDict->GetString("AS");
     if (as.IsEmpty()) {
       CFX_ByteString value = pAnnotDict->GetString(FX_BSTRC("V"));
       if (value.IsEmpty()) {
         CPDF_Dictionary* pDict = pAnnotDict->GetDict(FX_BSTRC("Parent"));
         value = pDict ? pDict->GetString(FX_BSTRC("V")) : CFX_ByteString();
       }
-      if (value.IsEmpty() || !pDict->KeyExist(value)) {
+      if (value.IsEmpty() || !pDict->KeyExist(value))
         as = FX_BSTRC("Off");
-      } else {
+      else
         as = value;
-      }
     }
-    pStream = pDict->GetStream(as);
+    return pDict->GetStream(as);
   }
-  return pStream;
+  return nullptr;
 }
 CPDF_Form* CPDF_Annot::GetAPForm(const CPDF_Page* pPage, AppearanceMode mode) {
   CPDF_Stream* pStream = FPDFDOC_GetAnnotAP(m_pAnnotDict, mode);
   if (pStream == NULL) {
     return NULL;
   }
   CPDF_Form* pForm;
   if (m_APMap.Lookup(pStream, (void*&)pForm)) {
     return pForm;
   }
@@ skipping 142 matching lines @@
   CPDF_PathData path;
   width /= 2;
   path.AppendRect(rect.left + width, rect.bottom + width, rect.right - width,
                   rect.top - width);
   int fill_type = 0;
   if (pOptions && (pOptions->m_Flags & RENDER_NOPATHSMOOTH)) {
     fill_type |= FXFILL_NOPATHSMOOTH;
   }
   pDevice->DrawPath(&path, pUser2Device, &graph_state, argb, argb, fill_type);
 }