text: /*
   * 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/gm.h"
  #include "include/core/SkBlurTypes.h"
  #include "include/core/SkCanvas.h"
  #include "include/core/SkColor.h"
  #include "include/core/SkImageFilter.h"
  #include "include/core/SkMaskFilter.h"
  #include "include/core/SkPaint.h"
  #include "include/core/SkPathEffect.h"
  #include "include/core/SkPoint.h"
  #include "include/core/SkRegion.h"
  #include "include/core/SkShader.h"
  #include "include/core/SkSize.h"
  #include "include/core/SkString.h"
  #include "include/core/SkTileMode.h"
  #include "include/effects/SkDashPathEffect.h"
  #include "include/effects/SkGradientShader.h"
  #include "include/effects/SkImageFilters.h"
  
  class DrawRegionModesGM : public skiagm::GM {
  public:
      DrawRegionModesGM() {}
  
  protected:
      SkString onShortName() override {
          return SkString("drawregionmodes");
      }
  
      SkISize onISize() override {
          return SkISize::Make(375, 500);
      }
  
      void onOnceBeforeDraw() override {
          fRegion.op({50,  50, 100, 100}, SkRegion::kUnion_Op);
          fRegion.op({50, 100, 150, 150}, SkRegion::kUnion_Op);
      }
  
      void onDraw(SkCanvas* canvas) override {
          canvas->clear(SK_ColorGREEN);
  
          SkPaint paint;
          paint.setStyle(SkPaint::kFill_Style);
          paint.setColor(SK_ColorRED);
          paint.setAntiAlias(true);
  
          canvas->save();
          canvas->translate(-50.0f, 75.0f);
          canvas->rotate(-45.0f);
          canvas->drawRegion(fRegion, paint);
  
          canvas->translate(125.0f, 125.0f);
          paint.setImageFilter(SkImageFilters::Blur(5.0f, 5.0f, nullptr, nullptr));
          canvas->drawRegion(fRegion, paint);
  
          canvas->translate(-125.0f, 125.0f);
          paint.setImageFilter(nullptr);
          paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 5.0f));
          canvas->drawRegion(fRegion, paint);
  
          canvas->translate(-125.0f, -125.0f);
          paint.setMaskFilter(nullptr);
          paint.setStyle(SkPaint::kStroke_Style);
          float intervals[] = { 5.0f, 5.0f };
          paint.setPathEffect(SkDashPathEffect::Make(intervals, 2, 2.5f));
          canvas->drawRegion(fRegion, paint);
  
          canvas->restore();
  
          canvas->translate(100, 325);
          paint.setPathEffect(nullptr);
          paint.setStyle(SkPaint::kFill_Style);
          SkPoint points[] = { SkPoint::Make(50.0f, 50.0f), SkPoint::Make(150.0f, 150.0f) };
          SkColor colors[] = { SK_ColorBLUE, SK_ColorYELLOW };
          paint.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 2,
                                                       SkTileMode::kClamp));
          canvas->drawRegion(fRegion, paint);
      }
  
  private:
      SkRegion fRegion;
  
      using INHERITED = skiagm::GM;
  };
  DEF_GM( return new DrawRegionModesGM; )
  