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- /*
- * 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/SkFilterQuality.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 onShortName() override {
- return SkString("blurquickreject");
- }
- SkISize onISize() 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(SK_ARRAY_COUNT(colors) == SK_ARRAY_COUNT(blurRects));
- SkPaint hairlinePaint;
- hairlinePaint.setStyle(SkPaint::kStroke_Style);
- hairlinePaint.setColor(SK_ColorWHITE);
- hairlinePaint.setStrokeWidth(0);
- SkPaint blurPaint;
- blurPaint.setFilterQuality(kLow_SkFilterQuality);
- 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 < SK_ARRAY_COUNT(blurRects); ++i) {
- blurPaint.setColor(colors[i]);
- canvas->drawRect(blurRects[i], blurPaint);
- canvas->drawRect(blurRects[i], hairlinePaint);
- }
- canvas->restore();
- }
- private:
- static constexpr int kWidth = 300;
- static constexpr int kHeight = 300;
- typedef GM INHERITED;
- };
- DEF_GM( return new BlurQuickRejectGM(); )
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