switch xfermodes over to sk_sp

gm/arithmode.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 92 matching lines @@
         SkScalar gap = SkIntToScalar(src.width() + 20);
         while (k < stop) {
             SkScalar x = 0;
             canvas->drawBitmap(src, x, y, nullptr);
             x += gap;
             canvas->drawBitmap(dst, x, y, nullptr);
             x += gap;
             SkRect rect = SkRect::MakeXYWH(x, y, SkIntToScalar(WW), SkIntToScalar(HH));
             canvas->saveLayer(&rect, nullptr);
             canvas->drawBitmap(dst, x, y, nullptr);
-            SkXfermode* xfer = SkArithmeticMode::Create(k[0], k[1], k[2], k[3]);
             SkPaint paint;
-            paint.setXfermode(xfer)->unref();
+            paint.setXfermode(SkArithmeticMode::Make(k[0], k[1], k[2], k[3]));
             canvas->drawBitmap(src, x, y, &paint);
             canvas->restore();
             x += gap;
             show_k_text(canvas, x, y, k);
             k += 4;
             y += SkIntToScalar(src.height() + 12);
         }
 
         // Draw two special cases to test enforcePMColor. In these cases, we
         // draw the dst bitmap twice, the first time it is halved and inverted,
         // leading to invalid premultiplied colors. If we enforcePMColor, these
         // invalid values should be clamped, and will not contribute to the
         // second draw.
         for (int i = 0; i < 2; i++) {
             const bool enforcePMColor = (i == 0);
             SkScalar x = gap;
             canvas->drawBitmap(dst, x, y, nullptr);
             x += gap;
             SkRect rect = SkRect::MakeXYWH(x, y, SkIntToScalar(WW), SkIntToScalar(HH));
             canvas->saveLayer(&rect, nullptr);
-            SkXfermode* xfer1 = SkArithmeticMode::Create(0, -one / 2, 0, 1, enforcePMColor);
             SkPaint paint1;
-            paint1.setXfermode(xfer1)->unref();
+            paint1.setXfermode(SkArithmeticMode::Make(0, -one / 2, 0, 1, enforcePMColor));
             canvas->drawBitmap(dst, x, y, &paint1);
-            SkXfermode* xfer2 = SkArithmeticMode::Create(0, one / 2, -one, 1);
             SkPaint paint2;
-            paint2.setXfermode(xfer2)->unref();
+            paint2.setXfermode(SkArithmeticMode::Make(0, one / 2, -one, 1));
             canvas->drawBitmap(dst, x, y, &paint2);
             canvas->restore();
             x += gap;
 
             // Label
             SkPaint paint;
             paint.setTextSize(SkIntToScalar(24));
             paint.setAntiAlias(true);
             sk_tool_utils::set_portable_typeface(&paint);
             SkString str(enforcePMColor ? "enforcePM" : "no enforcePM");
             canvas->drawText(str.c_str(), str.size(), x, y + paint.getTextSize(), paint);
 
             y += SkIntToScalar(src.height() + 12);
         }
     }
 
 private:
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return new ArithmodeGM; )