Add type cast definitions for CPDF_Stream.

core/src/fpdfapi/fpdf_page/fpdf_page_pattern.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 "../../../include/fpdfapi/fpdf_page.h"
 #include "pageint.h"
 
 CPDF_Pattern::CPDF_Pattern(const CFX_AffineMatrix* pParentMatrix)
@@ skipping 20 matching lines @@
   if (parentMatrix) {
     m_Pattern2Form.Concat(*parentMatrix);
   }
   m_pForm = NULL;
 }
 CPDF_TilingPattern::~CPDF_TilingPattern() {
   delete m_pForm;
   m_pForm = NULL;
 }
 FX_BOOL CPDF_TilingPattern::Load() {
-  if (m_pForm != NULL) {
+  if (m_pForm)
     return TRUE;
-  }
+
   CPDF_Dictionary* pDict = m_pPatternObj->GetDict();
-  if (pDict == NULL) {
+  if (!pDict)
     return FALSE;
-  }
+
   m_bColored = pDict->GetInteger(FX_BSTRC("PaintType")) == 1;
   m_XStep = (FX_FLOAT)FXSYS_fabs(pDict->GetNumber(FX_BSTRC("XStep")));
   m_YStep = (FX_FLOAT)FXSYS_fabs(pDict->GetNumber(FX_BSTRC("YStep")));
-  if (m_pPatternObj->GetType() != PDFOBJ_STREAM) {
+
+  CPDF_Stream* pStream = m_pPatternObj->AsStream();
+  if (!pStream)
     return FALSE;
-  }
-  CPDF_Stream* pStream = (CPDF_Stream*)m_pPatternObj;
+
   m_pForm = new CPDF_Form(m_pDocument, NULL, pStream);
   m_pForm->ParseContent(NULL, &m_ParentMatrix, NULL, NULL);
   m_BBox = pDict->GetRect(FX_BSTRC("BBox"));
   return TRUE;
 }
 CPDF_ShadingPattern::CPDF_ShadingPattern(CPDF_Document* pDoc,
                                          CPDF_Object* pPatternObj,
                                          FX_BOOL bShading,
                                          const CFX_AffineMatrix* parentMatrix)
     : CPDF_Pattern(parentMatrix) {
@@ skipping 181 matching lines @@
     m_BitStream.ByteAlign();
   }
   return TRUE;
 }
 CFX_FloatRect _GetShadingBBox(CPDF_Stream* pStream,
                               int type,
                               const CFX_AffineMatrix* pMatrix,
                               CPDF_Function** pFuncs,
                               int nFuncs,
                               CPDF_ColorSpace* pCS) {
-  if (pStream == NULL || pStream->GetType() != PDFOBJ_STREAM ||
-      pFuncs == NULL || pCS == NULL) {
+  if (!pStream || !pStream->IsStream() || !pFuncs || !pCS)
     return CFX_FloatRect(0, 0, 0, 0);
-  }
+
   CPDF_MeshStream stream;
-  if (!stream.Load(pStream, pFuncs, nFuncs, pCS)) {
+  if (!stream.Load(pStream, pFuncs, nFuncs, pCS))
     return CFX_FloatRect(0, 0, 0, 0);
-  }
+
   CFX_FloatRect rect;
   FX_BOOL bStarted = FALSE;
   FX_BOOL bGouraud = type == 4 || type == 5;
   int full_point_count = type == 7 ? 16 : (type == 6 ? 12 : 1);
   int full_color_count = (type == 6 || type == 7) ? 4 : 1;
   while (!stream.m_BitStream.IsEOF()) {
     FX_DWORD flag = 0;
     if (type != 5) {
       flag = stream.GetFlag();
     }
     int point_count = full_point_count, color_count = full_color_count;
     if (!bGouraud && flag) {
       point_count -= 4;
       color_count -= 2;
     }
     for (int i = 0; i < point_count; i++) {
       FX_FLOAT x, y;
       stream.GetCoords(x, y);
       if (bStarted) {
         rect.UpdateRect(x, y);
       } else {
         rect.InitRect(x, y);
         bStarted = TRUE;
       }
     }
     stream.m_BitStream.SkipBits(stream.m_nComps * stream.m_nCompBits *
                                 color_count);
-    if (bGouraud) {
+    if (bGouraud)
       stream.m_BitStream.ByteAlign();
-    }
   }
   rect.Transform(pMatrix);
   return rect;
 }