Convert FWL_ERR into an enum class.

xfa/fxgraphics/cfx_color.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 "xfa/fxgraphics/cfx_color.h"
 
 CFX_Color::CFX_Color() : m_type(FX_COLOR_None) {}
 
 CFX_Color::CFX_Color(const FX_ARGB argb) {
   Set(argb);
 }
 
 CFX_Color::CFX_Color(CFX_Pattern* pattern, const FX_ARGB argb) {
   Set(pattern, argb);
 }
 
 CFX_Color::CFX_Color(CFX_Shading* shading) {
   Set(shading);
 }
 
 CFX_Color::~CFX_Color() {
   m_type = FX_COLOR_None;
 }
 
-FX_ERR CFX_Color::Set(const FX_ARGB argb) {
+FWL_Error CFX_Color::Set(const FX_ARGB argb) {
   m_type = FX_COLOR_Solid;
   m_info.argb = argb;
   m_info.pattern = nullptr;
-  return FX_ERR_Succeeded;
+  return FWL_Error::Succeeded;
 }
 
-FX_ERR CFX_Color::Set(CFX_Pattern* pattern, const FX_ARGB argb) {
+FWL_Error CFX_Color::Set(CFX_Pattern* pattern, const FX_ARGB argb) {
   if (!pattern)
-    return FX_ERR_Parameter_Invalid;
+    return FWL_Error::ParameterInvalid;
   m_type = FX_COLOR_Pattern;
   m_info.argb = argb;
   m_info.pattern = pattern;
-  return FX_ERR_Succeeded;
+  return FWL_Error::Succeeded;
 }
 
-FX_ERR CFX_Color::Set(CFX_Shading* shading) {
+FWL_Error CFX_Color::Set(CFX_Shading* shading) {
   if (!shading)
-    return FX_ERR_Parameter_Invalid;
+    return FWL_Error::ParameterInvalid;
   m_type = FX_COLOR_Shading;
   m_shading = shading;
-  return FX_ERR_Succeeded;
+  return FWL_Error::Succeeded;
 }