Make CPDF_ColorState have a CFX_ColorStateData rather than inheriting

core/fpdfapi/fpdf_page/cpdf_colorstate.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfapi/fpdf_page/cpdf_colorstate.h"
 
 #include "core/fpdfapi/fpdf_page/cpdf_pattern.h"
 #include "core/fpdfapi/fpdf_page/cpdf_tilingpattern.h"
 #include "core/fxge/include/fx_dib.h"
 
+CPDF_ColorState::CPDF_ColorState() {}
+
+CPDF_ColorState::CPDF_ColorState(const CPDF_ColorState& that)
+    : m_Ref(that.m_Ref) {}
+
+CPDF_ColorState::~CPDF_ColorState() {}
+
+void CPDF_ColorState::Emplace() {
+  m_Ref.Emplace();
+}
+
+void CPDF_ColorState::SetDefault() {
+  m_Ref.GetPrivateCopy()->Default();
+}
+
+uint32_t CPDF_ColorState::GetFillRGB() const {
+  return m_Ref.GetObject()->m_FillRGB;
+}
+
+void CPDF_ColorState::SetFillRGB(uint32_t rgb) {
+  m_Ref.GetPrivateCopy()->m_FillRGB = rgb;
+}
+
+uint32_t CPDF_ColorState::GetStrokeRGB() const {
+  return m_Ref.GetObject()->m_StrokeRGB;
+}
+
+void CPDF_ColorState::SetStrokeRGB(uint32_t rgb) {
+  m_Ref.GetPrivateCopy()->m_StrokeRGB = rgb;
+}
+
+const CPDF_Color* CPDF_ColorState::GetFillColor() const {
+  const CPDF_ColorStateData* pData = m_Ref.GetObject();
+  return pData ? &pData->m_FillColor : nullptr;
+}
+
+CPDF_Color* CPDF_ColorState::GetMutableFillColor() {
+  return &m_Ref.GetPrivateCopy()->m_FillColor;
+}
+
+bool CPDF_ColorState::HasFillColor() const {
+  const CPDF_Color* pColor = GetFillColor();
+  return pColor && !pColor->IsNull();
+}
+
+const CPDF_Color* CPDF_ColorState::GetStrokeColor() const {
+  const CPDF_ColorStateData* pData = m_Ref.GetObject();
+  return pData ? &pData->m_StrokeColor : nullptr;
+}
+
+CPDF_Color* CPDF_ColorState::GetMutableStrokeColor() {
+  return &m_Ref.GetPrivateCopy()->m_StrokeColor;
+}
+
+bool CPDF_ColorState::HasStrokeColor() const {
+  const CPDF_Color* pColor = GetStrokeColor();
+  return pColor && !pColor->IsNull();
+}
+
 void CPDF_ColorState::SetFillColor(CPDF_ColorSpace* pCS,
                                    FX_FLOAT* pValue,
                                    uint32_t nValues) {
-  CPDF_ColorStateData* pData = GetPrivateCopy();
+  CPDF_ColorStateData* pData = m_Ref.GetPrivateCopy();
   SetColor(pData->m_FillColor, pData->m_FillRGB, pCS, pValue, nValues);
 }
 
 void CPDF_ColorState::SetStrokeColor(CPDF_ColorSpace* pCS,
                                      FX_FLOAT* pValue,
                                      uint32_t nValues) {
-  CPDF_ColorStateData* pData = GetPrivateCopy();
+  CPDF_ColorStateData* pData = m_Ref.GetPrivateCopy();
   SetColor(pData->m_StrokeColor, pData->m_StrokeRGB, pCS, pValue, nValues);
 }
 
-void CPDF_ColorState::SetColor(CPDF_Color& color,
-                               uint32_t& rgb,
-                               CPDF_ColorSpace* pCS,
-                               FX_FLOAT* pValue,
-                               uint32_t nValues) {
-  if (pCS) {
-    color.SetColorSpace(pCS);
-  } else if (color.IsNull()) {
-    color.SetColorSpace(CPDF_ColorSpace::GetStockCS(PDFCS_DEVICEGRAY));
-  }
-  if (color.GetColorSpace()->CountComponents() > nValues)
-    return;
-
-  color.SetValue(pValue);
-  int R, G, B;
-  rgb = color.GetRGB(R, G, B) ? FXSYS_RGB(R, G, B) : (uint32_t)-1;
-}
-
 void CPDF_ColorState::SetFillPattern(CPDF_Pattern* pPattern,
                                      FX_FLOAT* pValue,
                                      uint32_t nValues) {
-  CPDF_ColorStateData* pData = GetPrivateCopy();
+  CPDF_ColorStateData* pData = m_Ref.GetPrivateCopy();
   pData->m_FillColor.SetValue(pPattern, pValue, nValues);
   int R, G, B;
   FX_BOOL ret = pData->m_FillColor.GetRGB(R, G, B);
   if (CPDF_TilingPattern* pTilingPattern = pPattern->AsTilingPattern()) {
     if (!ret && pTilingPattern->colored()) {
       pData->m_FillRGB = 0x00BFBFBF;
       return;
     }
   }
   pData->m_FillRGB = ret ? FXSYS_RGB(R, G, B) : (uint32_t)-1;
 }
 
 void CPDF_ColorState::SetStrokePattern(CPDF_Pattern* pPattern,
                                        FX_FLOAT* pValue,
                                        uint32_t nValues) {
-  CPDF_ColorStateData* pData = GetPrivateCopy();
+  CPDF_ColorStateData* pData = m_Ref.GetPrivateCopy();
   pData->m_StrokeColor.SetValue(pPattern, pValue, nValues);
   int R, G, B;
   FX_BOOL ret = pData->m_StrokeColor.GetRGB(R, G, B);
   if (CPDF_TilingPattern* pTilingPattern = pPattern->AsTilingPattern()) {
     if (!ret && pTilingPattern->colored()) {
       pData->m_StrokeRGB = 0x00BFBFBF;
       return;
     }
   }
   pData->m_StrokeRGB =
       pData->m_StrokeColor.GetRGB(R, G, B) ? FXSYS_RGB(R, G, B) : (uint32_t)-1;
 }
+
+void CPDF_ColorState::SetColor(CPDF_Color& color,
+                               uint32_t& rgb,
+                               CPDF_ColorSpace* pCS,
+                               FX_FLOAT* pValue,
+                               uint32_t nValues) {
+  if (pCS)
+    color.SetColorSpace(pCS);
+  else if (color.IsNull())
+    color.SetColorSpace(CPDF_ColorSpace::GetStockCS(PDFCS_DEVICEGRAY));
+
+  if (color.GetColorSpace()->CountComponents() > nValues)
+    return;
+
+  color.SetValue(pValue);
+  int R;
+  int G;
+  int B;
+  rgb = color.GetRGB(R, G, B) ? FXSYS_RGB(R, G, B) : (uint32_t)-1;
+}