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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkAnimTimer.h"
#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkString.h"
#include "SkRandom.h"
/**
* In GM mode this draws an array of circles with different radii and different blur radii. Below
* each circle an almost-circle path is drawn with the same blur filter for comparison.
*
* In Sample mode this draws a single circle and almost-circle with animating radius and blur
* radius.
*
* Bench mode draws the same as GM mode but without the comparison almost-circle paths. It also
* slightly perturbs the blur and circle radii to stress caching of blurred profiles in GPU mode.
*/
class BlurCircles2GM : public skiagm::GM {
public:
BlurCircles2GM() {
fAnimRadius = SkAnimTimer::PingPong(0, kRadiusPingPoingPeriod, kRadiusPingPoingShift,
kMinRadius, kMaxRadius);
fAnimBlurRadius = SkAnimTimer::PingPong(0, kBlurRadiusPingPoingPeriod,
kBlurRadiusPingPoingShift, kMinBlurRadius,
kMaxBlurRadius);
}
protected:
bool runAsBench() const override { return true; }
SkString onShortName() override { return SkString("blurcircles2"); }
SkISize onISize() override {
return SkISize::Make(730, 1350);
}
void onDraw(SkCanvas* canvas) override {
constexpr SkScalar kMaxR = kMaxRadius + kMaxBlurRadius;
auto almostCircleMaker = [] (SkScalar radius, SkPath* dst) {
dst->reset();
dst->addArc(SkRect::MakeXYWH(-radius, -radius, 2 * radius, 2 * radius), 0, 355);
dst->setIsVolatile(true);
dst->close();
};
auto blurMaker = [] (SkScalar radius) ->sk_sp<SkMaskFilter> {
return SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
SkBlurMask::ConvertRadiusToSigma(radius));
};
SkPaint paint;
paint.setColor(SK_ColorBLACK);
if (this->getMode() == kSample_Mode) {
paint.setMaskFilter(blurMaker(fAnimBlurRadius));
SkISize size = canvas->getBaseLayerSize();
SkPath almostCircle;
almostCircleMaker(fAnimRadius, &almostCircle);
canvas->save();
canvas->translate(size.fWidth / 2.f, size.fHeight / 4.f);
canvas->drawCircle(0, 0, fAnimRadius, paint);
canvas->translate(0, 2 * kMaxR);
canvas->drawPath(almostCircle, paint);
canvas->restore();
} else {
bool benchMode = this->getMode() == kBench_Mode;
canvas->save();
constexpr SkScalar kPad = 5;
constexpr SkScalar kRadiusSteps = 5;
constexpr SkScalar kBlurRadiusSteps = 5;
canvas->translate(kPad + kMinRadius + kMaxBlurRadius,
kPad + kMinRadius + kMaxBlurRadius);
constexpr SkScalar kDeltaRadius = (kMaxRadius - kMinRadius) / kRadiusSteps;
constexpr SkScalar kDeltaBlurRadius = (kMaxBlurRadius - kMinBlurRadius) /
kBlurRadiusSteps;
SkScalar lineWidth = 0;
if (!benchMode) {
for (int r = 0; r < kRadiusSteps - 1; ++r) {
const SkScalar radius = r * kDeltaRadius + kMinRadius;
lineWidth += 2 * (radius + kMaxBlurRadius) + kPad;
}
}
for (int br = 0; br < kBlurRadiusSteps; ++br) {
SkScalar blurRadius = br * kDeltaBlurRadius + kMinBlurRadius;
if (benchMode) {
blurRadius += fRandom.nextSScalar1() * kDeltaBlurRadius;
}
const SkScalar maxRowR = blurRadius + kMaxRadius;
paint.setMaskFilter(blurMaker(blurRadius));
canvas->save();
for (int r = 0; r < kRadiusSteps; ++r) {
SkScalar radius = r * kDeltaRadius + kMinRadius;
if (benchMode) {
radius += fRandom.nextSScalar1() * kDeltaRadius;
}
SkPath almostCircle;
if (!benchMode) {
almostCircleMaker(radius, &almostCircle);
}
canvas->save();
canvas->drawCircle(0, 0, radius, paint);
canvas->translate(0, 2 * maxRowR + kPad);
if (!benchMode) {
canvas->drawPath(almostCircle, paint);
}
canvas->restore();
const SkScalar maxColR = radius + kMaxBlurRadius;
canvas->translate(maxColR * 2 + kPad, 0);
}
canvas->restore();
if (!benchMode) {
SkPaint blackPaint;
blackPaint.setColor(SK_ColorBLACK);
const SkScalar lineY = 3 * maxRowR + 1.5f * kPad;
if (br != kBlurRadiusSteps - 1) {
canvas->drawLine(0, lineY, lineWidth, lineY, blackPaint);
}
}
canvas->translate(0, maxRowR * 4 + 2 * kPad);
}
canvas->restore();
}
}
bool onAnimate(const SkAnimTimer& timer) override {
fAnimRadius = timer.pingPong(kRadiusPingPoingPeriod, kRadiusPingPoingShift, kMinRadius,
kMaxRadius);
fAnimBlurRadius = timer.pingPong(kBlurRadiusPingPoingPeriod, kBlurRadiusPingPoingShift,
kMinBlurRadius, kMaxBlurRadius);
return true;
}
private:
static constexpr SkScalar kMinRadius = 15;
static constexpr SkScalar kMaxRadius = 45;
static constexpr SkScalar kRadiusPingPoingPeriod = 8;
static constexpr SkScalar kRadiusPingPoingShift = 3;
static constexpr SkScalar kMinBlurRadius = 5;
static constexpr SkScalar kMaxBlurRadius = 45;
static constexpr SkScalar kBlurRadiusPingPoingPeriod = 3;
static constexpr SkScalar kBlurRadiusPingPoingShift = 1.5;
SkScalar fAnimRadius;
SkScalar fAnimBlurRadius;
SkRandom fRandom;
typedef skiagm::GM INHERITED;
};
DEF_GM(return new BlurCircles2GM();)
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