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- /*
- * Copyright 2018 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColorFilter.h"
- #include "include/core/SkColorPriv.h"
- #include "include/core/SkFont.h"
- #include "include/core/SkImage.h"
- #include "include/core/SkTime.h"
- #include "include/core/SkTypeface.h"
- #include "include/utils/SkRandom.h"
- #include "samplecode/Sample.h"
- #include "tools/timer/Timer.h"
- #if SK_SUPPORT_GPU
- #include "include/gpu/GrContext.h"
- #endif
- // Create an animation of a bunch of letters that rotate in place. This is intended to stress
- // the glyph atlas and test that we don't see corruption or bad slowdowns.
- class FlutterAnimateView : public Sample {
- public:
- FlutterAnimateView() : fCurrTime(0), fResetTime(0) {}
- protected:
- void onOnceBeforeDraw() override {
- fTypeface = SkTypeface::MakeFromFile("/skimages/samplefont.ttf");
- initChars();
- }
- SkString name() override { return SkString("FlutterAnimate"); }
- void onDrawContent(SkCanvas* canvas) override {
- SkFont font(fTypeface, 50);
- SkPaint paint;
- paint.setFilterQuality(kMedium_SkFilterQuality);
- // rough center of each glyph
- static constexpr auto kMidX = 35;
- static constexpr auto kMidY = 50;
- canvas->clear(SK_ColorWHITE);
- for (int i = 0; i < kNumChars; ++i) {
- canvas->save();
- double rot = SkScalarInterp(fChars[i].fStartRotation, fChars[i].fEndRotation,
- fCurrTime/kDuration);
- canvas->translate(fChars[i].fPosition.fX + kMidX, fChars[i].fPosition.fY - kMidY);
- canvas->rotate(SkRadiansToDegrees(rot));
- canvas->translate(-35,+50);
- canvas->drawString(fChars[i].fChar, 0, 0, font, paint);
- canvas->restore();
- }
- }
- bool onAnimate(double nanos) override {
- fCurrTime = 1e-9 * nanos - fResetTime;
- if (fCurrTime > kDuration) {
- this->initChars();
- fResetTime = 1e-9 * nanos;
- fCurrTime = 0;
- }
- return true;
- }
- private:
- void initChars() {
- for (int i = 0; i < kNumChars; ++i) {
- char c = fRand.nextULessThan(26) + 65;
- fChars[i].fChar[0] = c;
- fChars[i].fChar[1] = '\0';
- fChars[i].fPosition = SkPoint::Make(fRand.nextF()*748 + 10, fRand.nextF()*1004 + 10);
- fChars[i].fStartRotation = fRand.nextF();
- fChars[i].fEndRotation = fRand.nextF() * 20 - 10;
- }
- }
- static constexpr double kDuration = 5.0;
- double fCurrTime;
- double fResetTime;
- SkRandom fRand;
- struct AnimatedChar {
- char fChar[2];
- SkPoint fPosition;
- SkScalar fStartRotation;
- SkScalar fEndRotation;
- };
- sk_sp<SkTypeface> fTypeface;
- static constexpr int kNumChars = 40;
- AnimatedChar fChars[kNumChars];
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new FlutterAnimateView(); )
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