Switch SkMorphologyImageFilter over to new onFilterImage interface

gm/morphology.cpp

 /*
  * Copyright 2012 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 "SkMorphologyImageFilter.h"
 
 #define WIDTH 700
 #define HEIGHT 560
 
 namespace skiagm {
 
 class MorphologyGM : public GM {
 public:
     MorphologyGM() {
         this->setBGColor(0xFF000000);
-        fOnce = false;
     }
 
 protected:
-    virtual SkString onShortName() {
+    SkString onShortName() override {
         return SkString("morphology");
     }
 
-    void make_bitmap() {
+    void onOnceBeforeDraw() override {
         fBitmap.allocN32Pixels(135, 135);
         SkCanvas canvas(fBitmap);
         canvas.clear(0x0);
         SkPaint paint;
         paint.setAntiAlias(true);
         sk_tool_utils::set_portable_typeface(&paint);
         const char* str1 = "ABC";
         const char* str2 = "XYZ";
         paint.setColor(0xFFFFFFFF);
         paint.setTextSize(64);
         canvas.drawText(str1, strlen(str1), 10, 55, paint);
         canvas.drawText(str2, strlen(str2), 10, 110, paint);
     }
 
-    virtual SkISize onISize() {
+    SkISize onISize() override {
         return SkISize::Make(WIDTH, HEIGHT);
     }
 
     void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x, int y) {
         canvas->save();
         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
         canvas->clipRect(SkRect::MakeWH(
           SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
         canvas->drawBitmap(fBitmap, 0, 0, &paint);
         canvas->restore();
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
-        if (!fOnce) {
-            make_bitmap();
-            fOnce = true;
-        }
+    void onDraw(SkCanvas* canvas) override {
         struct {
             int fWidth, fHeight;
             int fRadiusX, fRadiusY;
         } samples[] = {
             { 140, 140,   0,   0 },
             { 140, 140,   0,   2 },
             { 140, 140,   2,   0 },
             { 140, 140,   2,   2 },
             {  24,  24,  25,  25 },
         };
         SkPaint paint;
         SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(25, 20, 100, 80));
 
         for (unsigned j = 0; j < 4; ++j) {
             for (unsigned i = 0; i < SK_ARRAY_COUNT(samples); ++i) {
                 const SkImageFilter::CropRect* cr = j & 0x02 ? &cropRect : nullptr;
                 if (j & 0x01) {
                     paint.setImageFilter(SkErodeImageFilter::Create(
                         samples[i].fRadiusX,
                         samples[i].fRadiusY,
                         nullptr,
                         cr))->unref();
                 } else {
                     paint.setImageFilter(SkDilateImageFilter::Create(
                         samples[i].fRadiusX,
                         samples[i].fRadiusY,
                         nullptr,
                         cr))->unref();
                 }
-                drawClippedBitmap(canvas, paint, i * 140, j * 140);
+                this->drawClippedBitmap(canvas, paint, i * 140, j * 140);
             }
         }
     }
 
 private:
+    SkBitmap fBitmap;
+
     typedef GM INHERITED;
-    SkBitmap fBitmap;
-    bool fOnce;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
-static GM* MyFactory(void*) { return new MorphologyGM; }
-static GMRegistry reg(MyFactory);
+DEF_GM(return new MorphologyGM;)
 
 }