Tidy CPDF_ImageCacheEntry.

- Remove parameter to Reset() that is always nullptr.
- Initialize members in the header.

Change-Id: Ia0ac2f3c88eb192ef333f67ec0f9c398b0b59f29
Reviewed-on: https://pdfium-review.googlesource.com/c/51293
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

core/fpdfapi/render/cpdf_imagecacheentry.cpp

diff --git a/core/fpdfapi/render/cpdf_imagecacheentry.cpp b/core/fpdfapi/render/cpdf_imagecacheentry.cpp
index 681c39e..9691937 100644
--- a/core/fpdfapi/render/cpdf_imagecacheentry.cpp
+++ b/core/fpdfapi/render/cpdf_imagecacheentry.cpp
@@ -21,18 +21,12 @@
 
 CPDF_ImageCacheEntry::CPDF_ImageCacheEntry(CPDF_Document* pDoc,
                                            const RetainPtr<CPDF_Image>& pImage)
-    : m_dwTimeCount(0),
-      m_MatteColor(0),
-      m_pDocument(pDoc),
-      m_pImage(pImage),
-      m_dwCacheSize(0) {}
+    : m_pDocument(pDoc), m_pImage(pImage) {}
 
-CPDF_ImageCacheEntry::~CPDF_ImageCacheEntry() {}
+CPDF_ImageCacheEntry::~CPDF_ImageCacheEntry() = default;
 
-void CPDF_ImageCacheEntry::Reset(const RetainPtr<CFX_DIBitmap>& pBitmap) {
+void CPDF_ImageCacheEntry::Reset() {
   m_pCachedBitmap.Reset();
-  if (pBitmap)
-    m_pCachedBitmap = pBitmap->Clone(nullptr);
   CalcSize();
 }
 

core/fpdfapi/render/cpdf_imagecacheentry.h

diff --git a/core/fpdfapi/render/cpdf_imagecacheentry.h b/core/fpdfapi/render/cpdf_imagecacheentry.h
index 1cbe4ee..1a38019 100644
--- a/core/fpdfapi/render/cpdf_imagecacheentry.h
+++ b/core/fpdfapi/render/cpdf_imagecacheentry.h
@@ -12,7 +12,6 @@
 #include "core/fxcrt/retain_ptr.h"
 #include "core/fxcrt/unowned_ptr.h"
 
-class CFX_DIBitmap;
 class CPDF_Dictionary;
 class CPDF_Document;
 class CPDF_Image;
@@ -25,7 +24,7 @@
                        const RetainPtr<CPDF_Image>& pImage);
   ~CPDF_ImageCacheEntry();
 
-  void Reset(const RetainPtr<CFX_DIBitmap>& pBitmap);
+  void Reset();
   uint32_t EstimateSize() const { return m_dwCacheSize; }
   uint32_t GetTimeCount() const { return m_dwTimeCount; }
   CPDF_Image* GetImage() const { return m_pImage.Get(); }
@@ -44,8 +43,8 @@
   RetainPtr<CFX_DIBBase> DetachBitmap();
   RetainPtr<CFX_DIBBase> DetachMask();
 
-  int m_dwTimeCount;
-  uint32_t m_MatteColor;
+  int m_dwTimeCount = 0;
+  uint32_t m_MatteColor = 0;
 
  private:
   void ContinueGetCachedBitmap(CPDF_RenderStatus* pRenderStatus);
@@ -57,7 +56,7 @@
   RetainPtr<CFX_DIBBase> m_pCurMask;
   RetainPtr<CFX_DIBBase> m_pCachedBitmap;
   RetainPtr<CFX_DIBBase> m_pCachedMask;
-  uint32_t m_dwCacheSize;
+  uint32_t m_dwCacheSize = 0;
 };
 
 #endif  // CORE_FPDFAPI_RENDER_CPDF_IMAGECACHEENTRY_H_

core/fpdfapi/render/cpdf_pagerendercache.cpp

diff --git a/core/fpdfapi/render/cpdf_pagerendercache.cpp b/core/fpdfapi/render/cpdf_pagerendercache.cpp
index ba334ad..4d1add1 100644
--- a/core/fpdfapi/render/cpdf_pagerendercache.cpp
+++ b/core/fpdfapi/render/cpdf_pagerendercache.cpp
@@ -127,6 +127,6 @@
 
   pEntry = it->second.get();
   m_nCacheSize -= pEntry->EstimateSize();
-  pEntry->Reset(nullptr);
+  pEntry->Reset();
   m_nCacheSize += pEntry->EstimateSize();
 }