Make m_pShadingObj a CPDF_Stream instead of CPDF_Object.

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 53 matching lines @@
                                          const CFX_AffineMatrix* parentMatrix)
     : CPDF_Pattern(parentMatrix) {
   m_PatternType = PATTERN_SHADING;
   m_pPatternObj = bShading ? NULL : pPatternObj;
   m_pDocument = pDoc;
   m_bShadingObj = bShading;
   if (!bShading) {
     CPDF_Dictionary* pDict = m_pPatternObj->GetDict();
     ASSERT(pDict != NULL);
     m_Pattern2Form = pDict->GetMatrix(FX_BSTRC("Matrix"));
-    m_pShadingObj = pDict->GetElementValue(FX_BSTRC("Shading"));
+    m_pShadingObj = ToStream(pDict->GetElementValue(FX_BSTRC("Shading")));
     if (parentMatrix) {
       m_Pattern2Form.Concat(*parentMatrix);
     }
   } else {
-    m_pShadingObj = pPatternObj;
+    m_pShadingObj = ToStream(pPatternObj);
   }
   m_ShadingType = 0;
   m_pCS = NULL;
   m_nFuncs = 0;
   for (int i = 0; i < 4; i++) {
     m_pFunctions[i] = NULL;
   }
   m_pCountedCS = NULL;
 }
 CPDF_ShadingPattern::~CPDF_ShadingPattern() {
@@ skipping 12 matching lines @@
   m_pCS = NULL;
   m_pCountedCS = NULL;
   m_nFuncs = 0;
 }
 FX_BOOL CPDF_ShadingPattern::Load() {
   if (m_ShadingType != 0) {
     return TRUE;
   }
   CPDF_Dictionary* pShadingDict =
       m_pShadingObj ? m_pShadingObj->GetDict() : NULL;
   if (pShadingDict == NULL) {

[dsinclair, 2015/10/26 19:58:02]

We bail out here and fail to Load the shading pattern because m_pShadingObj will
now be a nullptr if it isn't a stream.

     return FALSE;
   }
   if (m_nFuncs) {
     for (int i = 0; i < m_nFuncs; i++)
       delete m_pFunctions[i];
     m_nFuncs = 0;
   }
   CPDF_Object* pFunc = pShadingDict->GetElementValue(FX_BSTRC("Function"));
   if (pFunc) {
     if (CPDF_Array* pArray = pFunc->AsArray()) {
@@ skipping 164 matching lines @@
       }
     }
     stream.m_BitStream.SkipBits(stream.m_nComps * stream.m_nCompBits *
                                 color_count);
     if (bGouraud)
       stream.m_BitStream.ByteAlign();
   }
   rect.Transform(pMatrix);
   return rect;
 }