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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "SkCanvas.h"
     10 #include "SkLerpXfermode.h"
     11 
     12 static void show_circlelayers(SkCanvas* canvas, SkXfermode* mode) {
     13     SkPaint paint;
     14     paint.setAntiAlias(true);
     15     SkRect r, bounds = { 10, 10, 110, 110 };
     16 
     17     r = bounds;
     18     r.fRight = bounds.centerX();
     19     canvas->drawRect(r, paint);
     20 
     21     canvas->saveLayer(&bounds, NULL);
     22 
     23     paint.setColor(0x80FF0000);
     24     r = bounds;
     25     r.inset(20, 0);
     26     canvas->drawOval(r, paint);
     27 
     28     paint.setColor(0x800000FF);
     29     r = bounds;
     30     r.inset(0, 20);
     31     paint.setXfermode(mode);
     32     canvas->drawOval(r, paint);
     33 
     34     canvas->restore();
     35 }
     36 
     37 class LerpXfermodeGM : public skiagm::GM {
     38 public:
     39     LerpXfermodeGM() {}
     40 
     41 protected:
     42     virtual SkString onShortName() SK_OVERRIDE {
     43         return SkString("lerpmode");
     44     }
     45 
     46     virtual SkISize onISize() SK_OVERRIDE {
     47         return SkISize::Make(240, 120);
     48     }
     49 
     50     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     51         show_circlelayers(canvas, NULL);
     52         canvas->translate(150, 0);
     53         SkAutoTUnref<SkXfermode> mode(SkLerpXfermode::Create(0.5f));
     54         show_circlelayers(canvas, mode.get());
     55     }
     56 
     57 private:
     58     typedef skiagm::GM INHERITED;
     59 };
     60 
     61 //////////////////////////////////////////////////////////////////////////////
     62 
     63 DEF_GM( return SkNEW(LerpXfermodeGM); )
     64