Encapsulate CPDF_ShadingObject members.

Change-Id: I9b878c8df4a6208fb1908bad09eb1c699970163f
Reviewed-on: https://pdfium-review.googlesource.com/21690
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

5 files changed, 17 insertions, 12 deletions

diff --git a/core/fpdfapi/page/cpdf_shadingobject.cpp b/core/fpdfapi/page/cpdf_shadingobject.cpp
index df3fbd17cd..1b16ac4862 100644
--- a/core/fpdfapi/page/cpdf_shadingobject.cpp
+++ b/core/fpdfapi/page/cpdf_shadingobject.cpp
@@ -9,7 +9,9 @@
 #include "core/fpdfapi/page/cpdf_shadingpattern.h"
 #include "core/fpdfapi/parser/cpdf_document.h"
 
-CPDF_ShadingObject::CPDF_ShadingObject() : m_pShading(nullptr) {}
+CPDF_ShadingObject::CPDF_ShadingObject(CPDF_ShadingPattern* pattern,
+                                       const CFX_Matrix& matrix)
+    : m_pShading(pattern), m_Matrix(matrix) {}
 
 CPDF_ShadingObject::~CPDF_ShadingObject() {}
 
diff --git a/core/fpdfapi/page/cpdf_shadingobject.h b/core/fpdfapi/page/cpdf_shadingobject.h
index a5405cb090..80e062c729 100644
--- a/core/fpdfapi/page/cpdf_shadingobject.h
+++ b/core/fpdfapi/page/cpdf_shadingobject.h
@@ -15,10 +15,10 @@ class CPDF_ShadingPattern;
 
 class CPDF_ShadingObject : public CPDF_PageObject {
  public:
-  CPDF_ShadingObject();
+  CPDF_ShadingObject(CPDF_ShadingPattern* pattern, const CFX_Matrix& matrix);
   ~CPDF_ShadingObject() override;
 
-  // CPDF_PageObject
+  // CPDF_PageObject:
   Type GetType() const override;
   void Transform(const CFX_Matrix& matrix) override;
   bool IsShading() const override;
@@ -27,6 +27,10 @@ class CPDF_ShadingObject : public CPDF_PageObject {
 
   void CalcBoundingBox();
 
+  const CPDF_ShadingPattern* pattern() const { return m_pShading.Get(); }
+  const CFX_Matrix& matrix() const { return m_Matrix; }
+
+ private:
   UnownedPtr<CPDF_ShadingPattern> m_pShading;
   CFX_Matrix m_Matrix;
 };
diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.cpp b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
index 3bd40d5b7c..4e3857bf85 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
@@ -1113,15 +1113,14 @@ void CPDF_StreamContentParser::Handle_ShadeFill() {
   if (!pShading->IsShadingObject() || !pShading->Load())
     return;
 
-  auto pObj = pdfium::MakeUnique<CPDF_ShadingObject>();
-  pObj->m_pShading = pShading;
+  CFX_Matrix matrix = m_pCurStates->m_CTM;
+  matrix.Concat(m_mtContentToUser);
+  auto pObj = pdfium::MakeUnique<CPDF_ShadingObject>(pShading, matrix);
   SetGraphicStates(pObj.get(), false, false, false);
-  pObj->m_Matrix = m_pCurStates->m_CTM;
-  pObj->m_Matrix.Concat(m_mtContentToUser);
   CFX_FloatRect bbox =
       pObj->m_ClipPath.HasRef() ? pObj->m_ClipPath.GetClipBox() : m_BBox;
   if (pShading->IsMeshShading())
-    bbox.Intersect(GetShadingBBox(pShading, pObj->m_Matrix));
+    bbox.Intersect(GetShadingBBox(pShading, pObj->matrix()));
   pObj->m_Left = bbox.left;
   pObj->m_Right = bbox.right;
   pObj->m_Top = bbox.top;
diff --git a/core/fpdfapi/render/cpdf_renderstatus.cpp b/core/fpdfapi/render/cpdf_renderstatus.cpp
index 3f61358d7f..8899867354 100644
--- a/core/fpdfapi/render/cpdf_renderstatus.cpp
+++ b/core/fpdfapi/render/cpdf_renderstatus.cpp
@@ -2065,7 +2065,7 @@ void CPDF_RenderStatus::DrawTextPathWithPattern(const CPDF_TextObject* textobj,
   }
 }
 
-void CPDF_RenderStatus::DrawShading(CPDF_ShadingPattern* pPattern,
+void CPDF_RenderStatus::DrawShading(const CPDF_ShadingPattern* pPattern,
                                     CFX_Matrix* pMatrix,
                                     FX_RECT& clip_rect,
                                     int alpha,
@@ -2197,9 +2197,9 @@ void CPDF_RenderStatus::ProcessShading(const CPDF_ShadingObject* pShadingObj,
   if (rect.IsEmpty())
     return;
 
-  CFX_Matrix matrix = pShadingObj->m_Matrix;
+  CFX_Matrix matrix = pShadingObj->matrix();
   matrix.Concat(*pObj2Device);
-  DrawShading(pShadingObj->m_pShading.Get(), &matrix, rect,
+  DrawShading(pShadingObj->pattern(), &matrix, rect,
               FXSYS_round(255 * pShadingObj->m_GeneralState.GetFillAlpha()),
               m_Options.ColorModeIs(CPDF_RenderOptions::kAlpha));
 }
diff --git a/core/fpdfapi/render/cpdf_renderstatus.h b/core/fpdfapi/render/cpdf_renderstatus.h
index 1dbdf5bbd3..c8b7b09017 100644
--- a/core/fpdfapi/render/cpdf_renderstatus.h
+++ b/core/fpdfapi/render/cpdf_renderstatus.h
@@ -121,7 +121,7 @@ class CPDF_RenderStatus {
   bool ProcessImage(CPDF_ImageObject* pImageObj, const CFX_Matrix* pObj2Device);
   void ProcessShading(const CPDF_ShadingObject* pShadingObj,
                       const CFX_Matrix* pObj2Device);
-  void DrawShading(CPDF_ShadingPattern* pPattern,
+  void DrawShading(const CPDF_ShadingPattern* pPattern,
                    CFX_Matrix* pMatrix,
                    FX_RECT& clip_rect,
                    int alpha,