Replace CPDF_Color::Copy() with honest-to-goodness operator=().

Change-Id: Ifcce7b1e513c8859752d5248ae686bbe5349e342
Reviewed-on: https://pdfium-review.googlesource.com/42614
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

4 files changed, 28 insertions, 21 deletions

diff --git a/core/fpdfapi/page/cpdf_color.cpp b/core/fpdfapi/page/cpdf_color.cpp
index 44b2e4023d..d772deb530 100644
--- a/core/fpdfapi/page/cpdf_color.cpp
+++ b/core/fpdfapi/page/cpdf_color.cpp
@@ -12,7 +12,11 @@
 #include "core/fpdfapi/parser/cpdf_document.h"
 #include "core/fxcrt/fx_system.h"
 
-CPDF_Color::CPDF_Color() {}
+CPDF_Color::CPDF_Color() = default;
+
+CPDF_Color::CPDF_Color(const CPDF_Color& that) {
+  *this = that;
+}
 
 CPDF_Color::~CPDF_Color() {
   ReleaseBuffer();
@@ -119,32 +123,37 @@ void CPDF_Color::SetValueForPattern(CPDF_Pattern* pPattern,
   }
 }
 
-void CPDF_Color::Copy(const CPDF_Color& src) {
+CPDF_Color& CPDF_Color::operator=(const CPDF_Color& that) {
+  if (this == &that)
+    return *this;
+
   ReleaseBuffer();
   ReleaseColorSpace();
-  m_pCS = src.m_pCS;
+  m_pCS = that.m_pCS;
   if (!m_pCS)
-    return;
+    return *this;
 
   CPDF_Document* pDoc = m_pCS->GetDocument();
   const CPDF_Array* pArray = m_pCS->GetArray();
   if (pDoc && pArray) {
     m_pCS = pDoc->GetPageData()->GetCopiedColorSpace(pArray);
     if (!m_pCS)
-      return;
+      return *this;
   }
   m_pBuffer = m_pCS->CreateBuf();
-  memcpy(m_pBuffer, src.m_pBuffer, m_pCS->GetBufSize());
+  memcpy(m_pBuffer, that.m_pBuffer, m_pCS->GetBufSize());
   if (!IsPatternInternal())
-    return;
+    return *this;
 
   PatternValue* pValue = reinterpret_cast<PatternValue*>(m_pBuffer);
   CPDF_Pattern* pPattern = pValue->m_pPattern;
   if (!pPattern)
-    return;
+    return *this;
 
   pValue->m_pPattern = pPattern->document()->GetPageData()->GetPattern(
       pPattern->pattern_obj(), false, pPattern->parent_matrix());
+
+  return *this;
 }
 
 uint32_t CPDF_Color::CountComponents() const {
diff --git a/core/fpdfapi/page/cpdf_color.h b/core/fpdfapi/page/cpdf_color.h
index 3448c152e2..084cc28f95 100644
--- a/core/fpdfapi/page/cpdf_color.h
+++ b/core/fpdfapi/page/cpdf_color.h
@@ -17,18 +17,18 @@ class CPDF_Pattern;
 class CPDF_Color {
  public:
   CPDF_Color();
+  CPDF_Color(const CPDF_Color& that);
+
   ~CPDF_Color();
 
+  CPDF_Color& operator=(const CPDF_Color& that);
+
   bool IsNull() const { return !m_pBuffer; }
   bool IsPattern() const;
-
-  void Copy(const CPDF_Color& src);
-
   void SetColorSpace(CPDF_ColorSpace* pCS);
   void SetValueForNonPattern(const std::vector<float>& values);
   void SetValueForPattern(CPDF_Pattern* pPattern,
                           const std::vector<float>& values);
-
   uint32_t CountComponents() const;
   bool IsColorSpaceRGB() const;
   bool GetRGB(int* R, int* G, int* B) const;
diff --git a/core/fpdfapi/page/cpdf_colorstate.cpp b/core/fpdfapi/page/cpdf_colorstate.cpp
index 05421dc873..c31ea14f0d 100644
--- a/core/fpdfapi/page/cpdf_colorstate.cpp
+++ b/core/fpdfapi/page/cpdf_colorstate.cpp
@@ -137,17 +137,15 @@ void CPDF_ColorState::SetPattern(CPDF_Pattern* pPattern,
   *colorref = ret ? FXSYS_BGR(B, G, R) : 0xFFFFFFFF;
 }
 
-CPDF_ColorState::ColorData::ColorData()
-    : m_FillColorRef(0), m_StrokeColorRef(0) {}
+CPDF_ColorState::ColorData::ColorData() = default;
 
 CPDF_ColorState::ColorData::ColorData(const ColorData& src)
     : m_FillColorRef(src.m_FillColorRef),
-      m_StrokeColorRef(src.m_StrokeColorRef) {
-  m_FillColor.Copy(src.m_FillColor);
-  m_StrokeColor.Copy(src.m_StrokeColor);
-}
+      m_StrokeColorRef(src.m_StrokeColorRef),
+      m_FillColor(src.m_FillColor),
+      m_StrokeColor(src.m_StrokeColor) {}
 
-CPDF_ColorState::ColorData::~ColorData() {}
+CPDF_ColorState::ColorData::~ColorData() = default;
 
 void CPDF_ColorState::ColorData::SetDefault() {
   m_FillColorRef = 0;
diff --git a/core/fpdfapi/page/cpdf_colorstate.h b/core/fpdfapi/page/cpdf_colorstate.h
index 7b72a2a9d2..cc8d91d818 100644
--- a/core/fpdfapi/page/cpdf_colorstate.h
+++ b/core/fpdfapi/page/cpdf_colorstate.h
@@ -58,8 +58,8 @@ class CPDF_ColorState {
 
     void SetDefault();
 
-    FX_COLORREF m_FillColorRef;
-    FX_COLORREF m_StrokeColorRef;
+    FX_COLORREF m_FillColorRef = 0;
+    FX_COLORREF m_StrokeColorRef = 0;
     CPDF_Color m_FillColor;
     CPDF_Color m_StrokeColor;
   };