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