use Make instead of Create to return a shared shader

samplecode/SampleShaders.cpp

Index: samplecode/SampleShaders.cpp
diff --git a/samplecode/SampleShaders.cpp b/samplecode/SampleShaders.cpp
index 2c0a6ab749c256e1e3b5bd2c279c8abb6908af10..71ddc2ec69d401074bb09cc83c2b179f76bc3d9a 100644
--- a/samplecode/SampleShaders.cpp
+++ b/samplecode/SampleShaders.cpp
@@ -1,10 +1,10 @@
-
 /*
  * 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"
@@ -21,8 +21,7 @@
 #include "SkTime.h"
 #include "SkTypeface.h"
 
-static SkShader* make_bitmapfade(const SkBitmap& bm)
-{
+static sk_sp<SkShader> make_bitmapfade(const SkBitmap& bm) {
     SkPoint pts[2];
     SkColor colors[2];
 
@@ -30,25 +29,20 @@ static SkShader* make_bitmapfade(const SkBitmap& bm)
     pts[1].set(0, SkIntToScalar(bm.height()));
     colors[0] = SK_ColorBLACK;
     colors[1] = SkColorSetARGB(0, 0, 0, 0);
-    SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
+    auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
 
-    SkShader* shaderB = SkShader::CreateBitmapShader(bm,
+    auto shaderB = SkShader::MakeBitmapShader(bm,
                         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
 
-    SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
+    SkAutoTUnref<SkXfermode> mode(SkXfermode::Create(SkXfermode::kDstIn_Mode));
 
-    SkShader* shader = SkShader::CreateComposeShader(shaderB, shaderA, mode);
-    shaderA->unref();
-    shaderB->unref();
-    mode->unref();
-
-    return shader;
+    return SkShader::MakeComposeShader(std::move(shaderB), std::move(shaderA), mode);
 }
 
 class ShaderView : public SampleView {
 public:
-    SkShader*   fShader;
-    SkBitmap    fBitmap;
+    sk_sp<SkShader> fShader;
+    SkBitmap        fBitmap;
 
     ShaderView() {
         SkImageDecoder::DecodeFile("/skimages/logo.gif", &fBitmap);
@@ -60,23 +54,17 @@ public:
         pts[1].set(SkIntToScalar(100), 0);
         colors[0] = SK_ColorRED;
         colors[1] = SK_ColorBLUE;
-        SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
+        auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
 
         pts[0].set(0, 0);
         pts[1].set(0, SkIntToScalar(100));
         colors[0] = SK_ColorBLACK;
         colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
-        SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
+        auto shaderB = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
 
-        SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
+        SkAutoTUnref<SkXfermode> mode(SkXfermode::Create(SkXfermode::kDstIn_Mode));
 
-        fShader = SkShader::CreateComposeShader(shaderA, shaderB, mode);
-        shaderA->unref();
-        shaderB->unref();
-        mode->unref();
-    }
-    virtual ~ShaderView() {
-        SkSafeUnref(fShader);
+        fShader = SkShader::MakeComposeShader(std::move(shaderA), std::move(shaderB), mode);
     }
 
 protected:
@@ -112,7 +100,7 @@ protected:
 
         paint.setShader(nullptr);
         canvas->drawRect(r, paint);
-        paint.setShader(make_bitmapfade(fBitmap))->unref();
+        paint.setShader(make_bitmapfade(fBitmap));
         canvas->drawRect(r, paint);
     }