When forcing clear page data, no need to release colorspace when releasing pattern

core/include/fpdfapi/fpdf_resource.h

 // 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
 
 #ifndef _FPDF_RESOURCE_
 #define _FPDF_RESOURCE_
 #ifndef _FPDF_PARSER_
 #include "fpdf_parser.h"
@@ skipping 712 matching lines @@
     void        ReleaseColorSpace();
     FX_FLOAT*                       m_pBuffer;
 };
 #define PATTERN_TILING          1
 #define PATTERN_SHADING         2
 class CPDF_Pattern : public CFX_Object
 {
 public:
    
     virtual ~CPDF_Pattern();
+    void    SetForceClear(FX_BOOL bForceClear) { m_bForceClear = bForceClear; }
 
     CPDF_Object*                m_pPatternObj;
 
     int                         m_PatternType;
 
     CFX_AffineMatrix            m_Pattern2Form;
     CFX_AffineMatrix            m_ParentMatrix;
 
     CPDF_Document*              m_pDocument;
 
 protected:
-    
     CPDF_Pattern(const CFX_AffineMatrix* pParentMatrix);
+    FX_BOOL     m_bForceClear;
 };
 
 class CPDF_TilingPattern : public CPDF_Pattern
 {
 public:
 
     CPDF_TilingPattern(CPDF_Document* pDoc, CPDF_Object* pPatternObj, const CFX_AffineMatrix* parentMatrix);
 
     virtual ~CPDF_TilingPattern();
 
@@ skipping 189 matching lines @@
     FX_BOOL                                     m_bIsMask;
 
     FX_BOOL                                     m_bInterpolate;
 
     CPDF_Document*                      m_pDocument;
 
     CPDF_Dictionary*            m_pOC;
     CPDF_Dictionary*    InitJPEG(FX_LPBYTE pData, FX_DWORD size);
 };
 #endif