| /* |
| * Copyright 2013 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/SkMaskFilter.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTypes.h" |
| #include "src/core/SkBlurMask.h" |
| |
| // This GM tests out the quick reject bounds of the blur mask filter. It draws |
| // four blurred rects around a central clip. The blurred rect geometry outset |
| // by the blur radius does not overlap the clip rect so, if the blur clipping |
| // just uses the radius, they will be clipped out (and the result will differ |
| // from the result if quick reject were disabled. If the blur clipping uses |
| // the correct 3 sigma bound then the images with and without quick rejecting |
| // will be the same. |
| class BlurQuickRejectGM : public skiagm::GM { |
| public: |
| BlurQuickRejectGM() {} |
| |
| protected: |
| SkString getName() const override { return SkString("blurquickreject"); } |
| |
| SkISize getISize() override { return SkISize::Make(kWidth, kHeight); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| constexpr SkScalar kBlurRadius = SkIntToScalar(20); |
| constexpr SkScalar kBoxSize = SkIntToScalar(100); |
| |
| SkRect clipRect = SkRect::MakeXYWH(0, 0, kBoxSize, kBoxSize); |
| SkRect blurRects[] = { |
| { -kBoxSize - (kBlurRadius+1), 0, -(kBlurRadius+1), kBoxSize }, |
| { 0, -kBoxSize - (kBlurRadius+1), kBoxSize, -(kBlurRadius+1) }, |
| { kBoxSize+kBlurRadius+1, 0, 2*kBoxSize+kBlurRadius+1, kBoxSize }, |
| { 0, kBoxSize+kBlurRadius+1, kBoxSize, 2*kBoxSize+kBlurRadius+1 } |
| }; |
| SkColor colors[] = { |
| SK_ColorRED, |
| SK_ColorGREEN, |
| SK_ColorBLUE, |
| SK_ColorYELLOW, |
| }; |
| SkASSERT(std::size(colors) == std::size(blurRects)); |
| |
| SkPaint hairlinePaint; |
| hairlinePaint.setStyle(SkPaint::kStroke_Style); |
| hairlinePaint.setColor(SK_ColorWHITE); |
| hairlinePaint.setStrokeWidth(0); |
| |
| SkPaint blurPaint; |
| blurPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, |
| SkBlurMask::ConvertRadiusToSigma(kBlurRadius))); |
| |
| canvas->clear(SK_ColorBLACK); |
| canvas->save(); |
| canvas->translate(kBoxSize, kBoxSize); |
| canvas->drawRect(clipRect, hairlinePaint); |
| canvas->clipRect(clipRect); |
| for (size_t i = 0; i < std::size(blurRects); ++i) { |
| blurPaint.setColor(colors[i]); |
| canvas->drawRect(blurRects[i], blurPaint); |
| canvas->drawRect(blurRects[i], hairlinePaint); |
| } |
| canvas->restore(); |
| } |
| |
| private: |
| inline static constexpr int kWidth = 300; |
| inline static constexpr int kHeight = 300; |
| |
| using INHERITED = GM; |
| }; |
| |
| DEF_GM( return new BlurQuickRejectGM(); ) |