CPDF_Document::LoadPattern() and friends always have a valid matrix.

core/fpdfapi/fpdf_parser/cpdf_document.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/fpdfapi/fpdf_parser/include/cpdf_document.h"
 
 #include <set>
 
@@ skipping 735 matching lines @@
   return m_pDocPage->GetFontFileStreamAcc(pStream);
 }
 
 CPDF_ColorSpace* CPDF_Document::LoadColorSpace(CPDF_Object* pCSObj,
                                                CPDF_Dictionary* pResources) {
   return m_pDocPage->GetColorSpace(pCSObj, pResources);
 }
 
 CPDF_Pattern* CPDF_Document::LoadPattern(CPDF_Object* pPatternObj,
                                          FX_BOOL bShading,
-                                         const CFX_Matrix* matrix) {
+                                         const CFX_Matrix& matrix) {
   return m_pDocPage->GetPattern(pPatternObj, bShading, matrix);
 }
 
 CPDF_IccProfile* CPDF_Document::LoadIccProfile(CPDF_Stream* pStream) {
   return m_pDocPage->GetIccProfile(pStream);
 }
 
 CPDF_Image* CPDF_Document::LoadImageF(CPDF_Object* pObj) {
   if (!pObj)
     return nullptr;
@@ skipping 672 matching lines @@
     }
   }
   pFontDesc->SetAtInteger("StemV", fStemV);
   AddIndirectObject(pFontDesc);
   pFontDict->SetAtReference("FontDescriptor", this, pFontDesc);
   CFRelease(traits);
   CFRelease(languages);
   return LoadFont(pBaseDict);
 }
 #endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_