Add m_pDocument in CPDF_Color and check if page date has been forced clear

core/include/fpdfapi/fpdf_resource.h

Index: core/include/fpdfapi/fpdf_resource.h
diff --git a/core/include/fpdfapi/fpdf_resource.h b/core/include/fpdfapi/fpdf_resource.h
index 4ce4ddc8bb519f2152384c7f9cc93485261a0f74..92c4872537af31ee832bb15bdaf33f8c04b247ce 100644
--- a/core/include/fpdfapi/fpdf_resource.h
+++ b/core/include/fpdfapi/fpdf_resource.h
@@ -680,10 +680,8 @@ class CPDF_Color : public CFX_Object
 {
 public:
 
-    CPDF_Color()
+    CPDF_Color() :m_pCS(NULL), m_pBuffer(NULL), m_pDocument(NULL)
     {
-        m_pBuffer = NULL;
-        m_pCS = NULL;
     }
 
     CPDF_Color(int family);
@@ -720,10 +718,11 @@ public:
 
     CPDF_ColorSpace*		m_pCS;
 
-    FX_FLOAT*			m_pBuffer;
 protected:
     void	ReleaseBuffer();
     void	ReleaseColorSpace();
+    FX_FLOAT*			    m_pBuffer;
+    CPDF_Document*          m_pDocument;
 };
 #define PATTERN_TILING		1
 #define PATTERN_SHADING		2
@@ -732,7 +731,6 @@ class CPDF_Pattern : public CFX_Object
 public:
    
     virtual ~CPDF_Pattern();
-    void SaveColor(CPDF_Color* pColor) {m_pColor = pColor;}
 
     CPDF_Object*                m_pPatternObj;
 
@@ -742,7 +740,6 @@ public:
     CFX_AffineMatrix            m_ParentMatrix;
 
     CPDF_Document*              m_pDocument;
-    CPDF_Color*                 m_pColor;
 
 protected: