Make StrokeSameStyle a nested enum class

-- define values so as to make it clearer it is a bitmask.
-- use Mask<> template since it is a bitmask.

Change-Id: I12018410e78b598efc65555be694968d583759e4
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/84350
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

xfa/fxfa/parser/cxfa_rectangle.cpp

diff --git a/xfa/fxfa/parser/cxfa_rectangle.cpp b/xfa/fxfa/parser/cxfa_rectangle.cpp
index 22b8816..f9b2874 100644
--- a/xfa/fxfa/parser/cxfa_rectangle.cpp
+++ b/xfa/fxfa/parser/cxfa_rectangle.cpp
@@ -74,7 +74,7 @@
   CXFA_Stroke* stroke1 = strokes[0];
   for (int32_t i = 1; i < 8; i++) {
     CXFA_Stroke* stroke2 = strokes[i];
-    if (!stroke1->SameStyles(stroke2, 0)) {
+    if (!stroke1->SameStyles(stroke2, {})) {
       bSameStyles = false;
       break;
     }
@@ -85,8 +85,9 @@
     stroke1 = strokes[0];
     for (int32_t i = 2; i < 8; i += 2) {
       CXFA_Stroke* stroke2 = strokes[i];
-      if (!stroke1->SameStyles(stroke2, XFA_STROKE_SAMESTYLE_NoPresence |
-                                            XFA_STROKE_SAMESTYLE_Corner)) {
+      if (!stroke1->SameStyles(stroke2,
+                               {CXFA_Stroke::SameStyleOption::kNoPresence,
+                                CXFA_Stroke::SameStyleOption::kCorner})) {
         bSameStyles = false;
         break;
       }
@@ -306,7 +307,7 @@
   CXFA_Stroke* stroke1 = strokes[0];
   for (int32_t i = 1; i < 8; i++) {
     CXFA_Stroke* stroke2 = strokes[i];
-    if (!stroke1->SameStyles(stroke2, 0)) {
+    if (!stroke1->SameStyles(stroke2, {})) {
       bSameStyles = false;
       break;
     }
@@ -317,8 +318,9 @@
     bClose = true;
     for (int32_t i = 2; i < 8; i += 2) {
       CXFA_Stroke* stroke2 = strokes[i];
-      if (!stroke1->SameStyles(stroke2, XFA_STROKE_SAMESTYLE_NoPresence |
-                                            XFA_STROKE_SAMESTYLE_Corner)) {
+      if (!stroke1->SameStyles(stroke2,
+                               {CXFA_Stroke::SameStyleOption::kNoPresence,
+                                CXFA_Stroke::SameStyleOption::kCorner})) {
         bSameStyles = false;
         break;
       }
@@ -349,7 +351,7 @@
     }
     GetPath(strokes, rtWidget, path, i, bStart, !bSameStyles);
 
-    bStart = !stroke->SameStyles(strokes[(i + 1) % 8], 0);
+    bStart = !stroke->SameStyles(strokes[(i + 1) % 8], {});
     if (bStart) {
       if (stroke)
         stroke->Stroke(pGS, path, matrix);
@@ -479,9 +481,9 @@
     CXFA_Stroke* strokeBefore = strokes[(nIndex + 1 * 8 - 1) % 8];
     CXFA_Stroke* strokeAfter = strokes[nIndex + 1];
     if (stroke->IsInverted()) {
-      if (!stroke->SameStyles(strokeBefore, 0))
+      if (!stroke->SameStyles(strokeBefore, {}))
         halfBefore = strokeBefore->GetThickness() / 2;
-      if (!stroke->SameStyles(strokeAfter, 0))
+      if (!stroke->SameStyles(strokeAfter, {}))
         halfAfter = strokeAfter->GetThickness() / 2;
     }
   } else {

xfa/fxfa/parser/cxfa_stroke.cpp

diff --git a/xfa/fxfa/parser/cxfa_stroke.cpp b/xfa/fxfa/parser/cxfa_stroke.cpp
index 7f2564f..175bc2d 100644
--- a/xfa/fxfa/parser/cxfa_stroke.cpp
+++ b/xfa/fxfa/parser/cxfa_stroke.cpp
@@ -149,12 +149,13 @@
       .ToUnit(XFA_Unit::Pt);
 }
 
-bool CXFA_Stroke::SameStyles(CXFA_Stroke* stroke, uint32_t dwFlags) {
+bool CXFA_Stroke::SameStyles(CXFA_Stroke* stroke,
+                             Mask<SameStyleOption> dwFlags) {
   if (this == stroke)
     return true;
   if (fabs(GetThickness() - stroke->GetThickness()) >= 0.01f)
     return false;
-  if ((dwFlags & XFA_STROKE_SAMESTYLE_NoPresence) == 0 &&
+  if (!(dwFlags & SameStyleOption::kNoPresence) &&
       IsVisible() != stroke->IsVisible()) {
     return false;
   }
@@ -162,7 +163,7 @@
     return false;
   if (GetColor() != stroke->GetColor())
     return false;
-  if ((dwFlags & XFA_STROKE_SAMESTYLE_Corner) != 0 &&
+  if ((dwFlags & CXFA_Stroke::SameStyleOption::kCorner) &&
       fabs(GetRadius() - stroke->GetRadius()) >= 0.01f) {
     return false;
   }

xfa/fxfa/parser/cxfa_stroke.h

diff --git a/xfa/fxfa/parser/cxfa_stroke.h b/xfa/fxfa/parser/cxfa_stroke.h
index 28637e5..33e1b55 100644
--- a/xfa/fxfa/parser/cxfa_stroke.h
+++ b/xfa/fxfa/parser/cxfa_stroke.h
@@ -7,15 +7,11 @@
 #ifndef XFA_FXFA_PARSER_CXFA_STROKE_H_
 #define XFA_FXFA_PARSER_CXFA_STROKE_H_
 
+#include "core/fxcrt/mask.h"
 #include "core/fxge/dib/fx_dib.h"
 #include "xfa/fxfa/fxfa_basic.h"
 #include "xfa/fxfa/parser/cxfa_node.h"
 
-enum StrokeSameStyle {
-  XFA_STROKE_SAMESTYLE_NoPresence = 1,
-  XFA_STROKE_SAMESTYLE_Corner = 2
-};
-
 class CFGAS_GEGraphics;
 class CFGAS_GEPath;
 class CXFA_Node;
@@ -26,6 +22,10 @@
 
 class CXFA_Stroke : public CXFA_Node {
  public:
+  enum class SameStyleOption {
+    kNoPresence = 1 << 0,
+    kCorner = 1 << 1,
+  };
   CONSTRUCT_VIA_MAKE_GARBAGE_COLLECTED;
   ~CXFA_Stroke() override;
 
@@ -45,7 +45,7 @@
   FX_ARGB GetColor();
   void SetColor(FX_ARGB argb);
 
-  bool SameStyles(CXFA_Stroke* stroke, uint32_t dwFlags);
+  bool SameStyles(CXFA_Stroke* stroke, Mask<SameStyleOption> dwFlags);
 
   void Stroke(CFGAS_GEGraphics* pGS,
               const CFGAS_GEPath& pPath,