Encapsulate GrReducedClip result in class members

src/utils/SkLua.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkLua.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 626 matching lines @@
 
 static int lcanvas_getClipStack(lua_State* L) {
     SkLua(L).pushClipStack(*get_ref<SkCanvas>(L, 1)->getClipStack());
     return 1;
 }
 
 int SkLua::lcanvas_getReducedClipStack(lua_State* L) {
 #if SK_SUPPORT_GPU
     const SkCanvas* canvas = get_ref<SkCanvas>(L, 1);
     SkRect queryBounds = SkRect::Make(canvas->getTopLayerBounds());
+    const GrReducedClip reducedClip(*canvas->getClipStack(), queryBounds);
 
-    GrReducedClip::ElementList elements;
-    int32_t genID;
-    SkIRect resultBounds;
-    bool requiresAA;
-
-    const SkClipStack& stack = *canvas->getClipStack();
-
-    GrReducedClip::ReduceClipStack(stack,
-                                   queryBounds,
-                                   &elements,
-                                   &genID,
-                                   &resultBounds,
-                                   &requiresAA);
-
-    GrReducedClip::ElementList::Iter iter(elements);
+    GrReducedClip::ElementList::Iter iter(reducedClip.elements());
     int i = 0;
     lua_newtable(L);
     while(iter.get()) {
         SkLua(L).pushClipStackElement(*iter.get());
         iter.next();
         lua_rawseti(L, -2, ++i);
     }
     // Currently this only returns the element list to lua, not the initial state or result bounds.
     // It could return these as additional items on the lua stack.
     return 1;
@@ skipping 1521 matching lines @@
     REG_CLASS(L, SkTextBlob);
     REG_CLASS(L, SkTypeface);
     REG_CLASS(L, SkXfermode);
 }
 
 extern "C" int luaopen_skia(lua_State* L);
 extern "C" int luaopen_skia(lua_State* L) {
     SkLua::Load(L);
     return 0;
 }