Assert CPDF_Pattern always has a valid CPDF_Document pointer.

Same for CPDF_DocPageData.

Change-Id: I8f2f559123dbb2f3623d957e4074d5f9d191797f
Reviewed-on: https://pdfium-review.googlesource.com/4501
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 10 insertions, 6 deletions

diff --git a/core/fpdfapi/page/cpdf_pattern.cpp b/core/fpdfapi/page/cpdf_pattern.cpp
index b0a2d81bca..88e5dee35c 100644
--- a/core/fpdfapi/page/cpdf_pattern.cpp
+++ b/core/fpdfapi/page/cpdf_pattern.cpp
@@ -6,13 +6,17 @@
 
 #include "core/fpdfapi/page/cpdf_pattern.h"
 
-CPDF_Pattern::CPDF_Pattern(PatternType type,
-                           CPDF_Document* pDoc,
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+
+CPDF_Pattern::CPDF_Pattern(CPDF_Document* pDoc,
                            CPDF_Object* pObj,
                            const CFX_Matrix& parentMatrix)
-    : m_PatternType(type),
-      m_pDocument(pDoc),
-      m_pPatternObj(pObj),
-      m_ParentMatrix(parentMatrix) {}
+    : m_pDocument(pDoc), m_pPatternObj(pObj), m_ParentMatrix(parentMatrix) {}
 
 CPDF_Pattern::~CPDF_Pattern() {}
+
+void CPDF_Pattern::SetPatternToFormMatrix() {
+  CPDF_Dictionary* pDict = pattern_obj()->GetDict();
+  m_Pattern2Form = pDict->GetMatrixFor("Matrix");
+  m_Pattern2Form.Concat(m_ParentMatrix);
+}