/* * 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 fTypeface; static constexpr int kNumChars = 40; AnimatedChar fChars[kNumChars]; typedef Sample INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_SAMPLE( return new FlutterAnimateView(); )