use ClipOp instead of SkRegion for clipping

samplecode/SampleClip.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleCode.h"
 #include "SkView.h"
 #include "SkCanvas.h"
@@ skipping 125 matching lines @@
         SkPath clipPath;
         r.inset(SK_Scalar1 / 4, SK_Scalar1 / 4);
         clipPath.addRoundRect(r, SkIntToScalar(20), SkIntToScalar(20));
 
 //        clipPath.toggleInverseFillType();
 
         for (int aa = 0; aa <= 1; ++aa) {
             canvas->save();
             for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); ++i) {
                 canvas->save();
-                canvas->clipPath(clipPath, SkRegion::kIntersect_Op, SkToBool(aa));
+                canvas->clipPath(clipPath, kIntersect_SkClipOp, SkToBool(aa));
 //                canvas->drawColor(SK_ColorWHITE);
                 gProc[i](canvas, SkToBool(aa));
                 canvas->restore();
                 canvas->translate(W * SK_Scalar1 * 8 / 7, 0);
             }
             canvas->restore();
             canvas->translate(0, H * SK_Scalar1 * 8 / 7);
         }
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new ClipView; }
 static SkViewRegister reg(MyFactory);