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      1 /*
      2  * Copyright 2015 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 "sk_tool_utils.h"
     10 #include "SkBlurMaskFilter.h"
     11 #include "SkClipOpPriv.h"
     12 #include "SkColorFilter.h"
     13 #include "SkPaint.h"
     14 #include "SkRRect.h"
     15 
     16 namespace skiagm {
     17 
     18 // This GM reproduces the precision artifacts seen in crbug.com/560651.
     19 // It draws a largish blurred circle with its center clipped out.
     20 class BlurredClippedCircleGM : public GM {
     21 public:
     22     BlurredClippedCircleGM() {
     23         this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
     24     }
     25 
     26 protected:
     27 
     28     SkString onShortName() override {
     29         return SkString("blurredclippedcircle");
     30     }
     31 
     32     SkISize onISize() override {
     33         return SkISize::Make(kWidth, kHeight);
     34     }
     35 
     36     void onDraw(SkCanvas* canvas) override {
     37         SkPaint whitePaint;
     38         whitePaint.setColor(SK_ColorWHITE);
     39         whitePaint.setBlendMode(SkBlendMode::kSrc);
     40         whitePaint.setAntiAlias(true);
     41 
     42         // This scale exercises precision limits in the circle blur effect (crbug.com/560651)
     43         constexpr float kScale = 2.0f;
     44         canvas->scale(kScale, kScale);
     45 
     46         canvas->save();
     47             SkRect clipRect1 = SkRect::MakeLTRB(0, 0,
     48                                                 SkIntToScalar(kWidth), SkIntToScalar(kHeight));
     49 
     50             canvas->clipRect(clipRect1);
     51 
     52             canvas->save();
     53 
     54                 canvas->clipRect(clipRect1);
     55                 canvas->drawRect(clipRect1, whitePaint);
     56 
     57                 canvas->save();
     58 
     59                     SkRect clipRect2 = SkRect::MakeLTRB(8, 8, 288, 288);
     60                     SkRRect clipRRect = SkRRect::MakeOval(clipRect2);
     61                     canvas->clipRRect(clipRRect, kDifference_SkClipOp, true);
     62 
     63                     SkRect r = SkRect::MakeLTRB(4, 4, 292, 292);
     64                     SkRRect rr = SkRRect::MakeOval(r);
     65 
     66                     SkPaint paint;
     67 
     68                     paint.setMaskFilter(SkBlurMaskFilter::Make(
     69                                             kNormal_SkBlurStyle,
     70                                             1.366025f,
     71                                             SkBlurMaskFilter::kHighQuality_BlurFlag));
     72                     paint.setColorFilter(SkColorFilter::MakeModeFilter(
     73                                              SK_ColorRED,
     74                                              SkBlendMode::kSrcIn));
     75                     paint.setAntiAlias(true);
     76 
     77                     canvas->drawRRect(rr, paint);
     78 
     79                 canvas->restore();
     80             canvas->restore();
     81         canvas->restore();
     82     }
     83 
     84 private:
     85     static constexpr int kWidth = 1164;
     86     static constexpr int kHeight = 802;
     87 
     88     typedef GM INHERITED;
     89 };
     90 
     91 //////////////////////////////////////////////////////////////////////////////
     92 
     93 DEF_GM(return new BlurredClippedCircleGM;)
     94 }
     95