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