Revert[8] "replace SkXfermode obj with SkBlendMode enum in paints"

samplecode/SampleLayerMask.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 "SkCanvas.h"
 #include "SkPaint.h"
@@ skipping 26 matching lines @@
             SkBitmap mask;
             int w = SkScalarRoundToInt(r.width());
             int h = SkScalarRoundToInt(r.height());
             mask.allocN32Pixels(w, h);
             mask.eraseColor(SK_ColorTRANSPARENT);
             SkCanvas c(mask);
             SkRect bounds = r;
             bounds.offset(-bounds.fLeft, -bounds.fTop);
             c.drawOval(bounds, paint);
 
-            paint.setXfermodeMode(SkXfermode::kDstIn_Mode);
+            paint.setBlendMode(SkBlendMode::kDstIn);
             canvas->drawBitmap(mask, r.fLeft, r.fTop, &paint);
         } else {
             SkPath p;
             p.addOval(r);
             p.setFillType(SkPath::kInverseWinding_FillType);
-            paint.setXfermodeMode(SkXfermode::kDstOut_Mode);
+            paint.setBlendMode(SkBlendMode::kDstOut);
             canvas->drawPath(p, paint);
         }
     }
 
     virtual void onDrawContent(SkCanvas* canvas) {
         SkRect  r;
         r.set(SkIntToScalar(20), SkIntToScalar(20), SkIntToScalar(120), SkIntToScalar(120));
         canvas->saveLayer(&r, nullptr);
         canvas->drawColor(SK_ColorRED);
         drawMask(canvas, r);
         canvas->restore();
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new LayerMaskView; }
 static SkViewRegister reg(MyFactory);