text: // Copyright 2020 Google LLC.
  // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
  #include "tools/fiddle/examples.h"
  REG_FIDDLE(blur4444, 650, 480, false, 0) {
  void draw(SkCanvas* canvas) {
      bool forceRaster = false;
      bool dither = false;
      bool postDither = false;
  
      canvas->clear(SK_ColorTRANSPARENT);
      SkPaint grayPaint;
      grayPaint.setColor(SK_ColorGRAY);
      SkPaint ltGrayPaint;
      ltGrayPaint.setColor(SK_ColorLTGRAY);
      canvas->drawRect({350, 0, 400, 480}, ltGrayPaint);
      canvas->drawRect({400, 0, 500, 480}, grayPaint);
      canvas->drawRect({500, 0, 640, 480}, SkPaint());
      canvas->drawRect({0, 200, 320, 215}, ltGrayPaint);
      canvas->drawRect({0, 215, 320, 230}, grayPaint);
      canvas->drawRect({0, 230, 320, 250}, SkPaint());
  
      sk_sp<SkSurface> surf;
      auto ii = SkImageInfo::Make(650, 480, kARGB_4444_SkColorType, kPremul_SkAlphaType);
      if (canvas->getGrContext() && !forceRaster) {
          surf = SkSurface::MakeRenderTarget(canvas->getGrContext(), SkBudgeted::kNo, ii);
      } else {
          surf = SkSurface::MakeRaster(ii);
      }
      if (!surf) {
          return;
      }
  
      auto c = surf->getCanvas();
      c->clear(SK_ColorTRANSPARENT);
  
      SkPaint blrPaint;
      blrPaint.setAntiAlias(true);
      blrPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 12.047));
      blrPaint.setFilterQuality(kLow_SkFilterQuality);
      blrPaint.setBlendMode(SkBlendMode::kSrc);
      blrPaint.setDither(dither);
  
      blrPaint.setColor(SK_ColorWHITE);
      c->drawRect(SkRect{0, 20, 640, 104}, blrPaint);
  
      blrPaint.setColor(SkColorSetARGB(255, 247, 247, 247));
      c->drawRect(SkRect{0, 0, 640, 84}.makeOffset(0, 300), blrPaint);
  
      static constexpr SkColor colors[]{SkColorSetARGB(255, 247, 247, 247), 0};
      static constexpr SkPoint pts[]{{0.5, 0}, {256.5, 0}};
      auto grd = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp);
      SkPaint grdPaint;
      grdPaint.setShader(grd);
      grdPaint.setDither(dither);
  
      c->drawRect(SkRect{0, 0, 640, 100}.makeOffset(0, 150), grdPaint);
  
      SkPaint postPaint;
      postPaint.setDither(postDither);
      surf->draw(canvas, 0, 0, &postPaint);
  }
  }  // END FIDDLE
  