Make SkRegion::operator== a member function, rather than a privately-declared

friend.  Without this, calling code has access to operator==, but can fail to
link because the implementation is assumed to have static linkage.

http://codereview.appspot.com/5577047/



git-svn-id: http://skia.googlecode.com/svn/trunk@3088 2bbb7eff-a529-9590-31e7-b0007b416f81

include/core/SkRegion.h

@@ -45,13 +45,13 @@ public:
      *  Return true if the two regions are equal. i.e. The enclose exactly
      *  the same area.
      */
-    friend bool operator==(const SkRegion& a, const SkRegion& b);
+    bool operator==(const SkRegion& other) const;
 
     /**
      *  Return true if the two regions are not equal.
      */
-    friend bool operator!=(const SkRegion& a, const SkRegion& b) {
-        return !(a == b);
+    bool operator!=(const SkRegion& other) const {
+        return !(*this == other);
     }
     
     /**

src/core/SkRegion.cpp

@@ -455,18 +455,18 @@ bool SkRegion::intersects(const SkRegion& rgn) const {
 
 /////////////////////////////////////////////////////////////////////////////////////
 
-bool operator==(const SkRegion& a, const SkRegion& b) {
-    SkDEBUGCODE(a.validate();)
+bool SkRegion::operator==(const SkRegion& b) const {
+    SkDEBUGCODE(validate();)
     SkDEBUGCODE(b.validate();)
 
-    if (&a == &b) {
+    if (this == &b) {
         return true;
     }
-    if (a.fBounds != b.fBounds) {
+    if (fBounds != b.fBounds) {
         return false;
     }
     
-    const SkRegion::RunHead* ah = a.fRunHead;
+    const SkRegion::RunHead* ah = fRunHead;
     const SkRegion::RunHead* bh = b.fRunHead;
 
     // this catches empties and rects being equal