use Make instead of Create to return a shared shader

samplecode/SampleShaderText.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 "SkGradientShader.h"
 #include "SkPath.h"
 #include "SkView.h"
 
 static void makebm(SkBitmap* bm, int w, int h) {
     bm->allocN32Pixels(w, h);
     bm->eraseColor(SK_ColorTRANSPARENT);
 
     SkCanvas    canvas(*bm);
     SkScalar s = SkIntToScalar(w < h ? w : h);
     SkPoint     pts[] = { { 0, 0 }, { s, s } };
     SkColor     colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
     SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
     SkPaint     paint;
 
     paint.setDither(true);
-    paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
-                                    SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode))->unref();
+    paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos,
+                                    SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode));
     canvas.drawPaint(paint);
 }
 
-static SkShader* MakeBitmapShader(SkShader::TileMode tx, SkShader::TileMode ty,
-                           int w, int h) {
+static sk_sp<SkShader> MakeBitmapShader(SkShader::TileMode tx, SkShader::TileMode ty,
+                                        int w, int h) {
     static SkBitmap bmp;
     if (bmp.isNull()) {
         makebm(&bmp, w/2, h/4);
     }
-    return SkShader::CreateBitmapShader(bmp, tx, ty);
+    return SkShader::MakeBitmapShader(bmp, tx, ty);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 struct GradData {
     int             fCount;
     const SkColor*  fColors;
     const SkScalar* fPos;
 };
 
 static const SkColor gColors[] = {
     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
 };
 
 static const GradData gGradData[] = {
     { 2, gColors, nullptr },
     { 5, gColors, nullptr },
 };
 
-static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
-    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
+static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+    return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
 }
 
-static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
-    return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
-                                          data.fPos, data.fCount, tm);
+    return SkGradientShader::MakeRadial(center, center.fX, data.fColors,
+                                        data.fPos, data.fCount, tm);
 }
 
-static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
-    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
+    return SkGradientShader::MakeSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
 }
 
-static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static sk_sp<SkShader> Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
     center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
-    return SkGradientShader::CreateTwoPointConical(
+    return SkGradientShader::MakeTwoPointConical(
                             center1, (pts[1].fX - pts[0].fX) / 7,
                             center0, (pts[1].fX - pts[0].fX) / 2,
                             data.fColors, data.fPos, data.fCount, tm);
 }
 
-typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
+typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
 
 static const GradMaker gGradMakers[] = {
     MakeLinear, MakeRadial, MakeSweep, Make2Conical
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class ShaderTextView : public SampleView {
 public:
     ShaderTextView() {
@@ skipping 27 matching lines @@
         SkShader::TileMode tileModes[] = {
             SkShader::kClamp_TileMode,
             SkShader::kRepeat_TileMode,
             SkShader::kMirror_TileMode
         };
 
         static const int gradCount = SK_ARRAY_COUNT(gGradData) *
                                      SK_ARRAY_COUNT(gGradMakers);
         static const int bmpCount = SK_ARRAY_COUNT(tileModes) *
                                     SK_ARRAY_COUNT(tileModes);
-        SkShader* shaders[gradCount + bmpCount];
+        sk_sp<SkShader> shaders[gradCount + bmpCount];
 
         int shdIdx = 0;
         for (size_t d = 0; d < SK_ARRAY_COUNT(gGradData); ++d) {
             for (size_t m = 0; m < SK_ARRAY_COUNT(gGradMakers); ++m) {
                 shaders[shdIdx++] = gGradMakers[m](pts,
                                                    gGradData[d],
                                                    SkShader::kClamp_TileMode);
             }
         }
         for (size_t tx = 0; tx < SK_ARRAY_COUNT(tileModes); ++tx) {
@@ skipping 21 matching lines @@
 
         static const int testsPerCol = 8;
         static const int rowHeight = 60;
         static const int colWidth = 300;
         canvas->save();
         for (size_t s = 0; s < SK_ARRAY_COUNT(shaders); s++) {
             canvas->save();
             size_t i = 2*s;
             canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth),
                               SkIntToScalar((i % testsPerCol) * rowHeight));
-            paint.setShader(shaders[s])->unref();
+            paint.setShader(shaders[s]);
             canvas->drawText(text, textLen, 0, textBase, paint);
             canvas->restore();
             canvas->save();
             ++i;
             canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth),
                               SkIntToScalar((i % testsPerCol) * rowHeight));
             canvas->drawTextOnPath(text, textLen, path, nullptr, paint);
             canvas->restore();
         }
         canvas->restore();
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new ShaderTextView; }
 static SkViewRegister reg(MyFactory);