switch xfermodes over to sk_sp

gm/hairmodes.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 "gm.h"
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
@@ skipping 15 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);
 
     paint.setColor(SK_ColorRED);
     paint.setAlpha(a1);
-    paint.setXfermode(mode);
+    paint.setXfermode(std::move(mode));
     for (int angle = 0; angle < 24; ++angle) {
         SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
         SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
         paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
         canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
     }
 
     return H;
 }
 
@@ skipping 33 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 GM INHERITED;
     };
 
     //////////////////////////////////////////////////////////////////////////////
 
     static GM* MyFactory(void*) { return new HairModesGM; }
     static GMRegistry reg(MyFactory);
 
 }