src/third_party/skia/gm/lerpmode.cpp

   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); )