Reduce CPU overhead on drawRegion()

gm/drawregion.cpp

 /*
  * Copyright 2016 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"
 
@@ skipping 19 matching lines @@
 
     void onOnceBeforeDraw() override {
         for (int x = 50; x < 250; x+=2) {
             for (int y = 50; y < 250; y+=2) {
                 fRegion.op(x, y, x + 1, y + 1, SkRegion::kUnion_Op);
             }
         }
     }
 
     void onDraw(SkCanvas* canvas) override {
+        canvas->translate(10, 10);

[msarett, 2016/08/26 18:41:55]

Applying the view matrix is a no-op when it's identity...

This translate allows the bench to show the cost of applying the matrix.

+
         SkPaint paint;
         paint.setStyle(SkPaint::kFill_Style);
         paint.setColor(0xFFFF00FF);
         canvas->drawRect(SkRect::MakeLTRB(50.0f, 50.0f, 250.0f, 250.0f), paint);
 
         paint.setColor(0xFF00FFFF);
         canvas->drawRegion(fRegion, paint);
     }
 
     SkRegion fRegion;
 
 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new DrawRegionGM; )