switch xfermodes over to sk_sp

samplecode/SampleHairModes.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 17 matching lines @@
     { SkXfermode::kSrcATop_Mode,  "SrcATop"   },
     { SkXfermode::kDstATop_Mode,  "DstATop"   },
     { SkXfermode::kXor_Mode,      "Xor"       },
 };
 
 const int gWidth = 64;
 const int gHeight = 64;
 const SkScalar W = SkIntToScalar(gWidth);
 const SkScalar H = SkIntToScalar(gHeight);
 
-static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode, SkAlpha a0, SkAlpha a1) {
-
+static SkScalar drawCell(SkCanvas* canvas, sk_sp<SkXfermode> mode, SkAlpha a0, SkAlpha a1) {
     SkPaint paint;
     paint.setAntiAlias(true);
 
     SkRect r = SkRect::MakeWH(W, H);
     r.inset(W/10, H/10);
 
     paint.setColor(SK_ColorBLUE);
     paint.setAlpha(a0);
     canvas->drawOval(r, paint);
 
@@ skipping 48 matching lines @@
 
         for (int alpha = 0; alpha < 4; ++alpha) {
             canvas->save();
             canvas->save();
             for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
                 if (6 == i) {
                     canvas->restore();
                     canvas->translate(W * 5, 0);
                     canvas->save();
                 }
-                SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
-
                 canvas->drawRect(bounds, fBGPaint);
                 canvas->saveLayer(&bounds, nullptr);
-                SkScalar dy = drawCell(canvas, mode,
+                SkScalar dy = drawCell(canvas, SkXfermode::Make(gModes[i].fMode),
                                        gAlphaValue[alpha & 1],
                                        gAlphaValue[alpha & 2]);
                 canvas->restore();
 
                 canvas->translate(0, dy * 5 / 4);
-                SkSafeUnref(mode);
             }
             canvas->restore();
             canvas->restore();
             canvas->translate(W * 5 / 4, 0);
         }
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new HairModesView; }
 static SkViewRegister reg(MyFactory);