1 /*
2 * Copyright 2018 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SampleCode.h"
9 #include "SkAnimTimer.h"
10 #include "SkView.h"
11 #include "SkCanvas.h"
12 #include "SkUtils.h"
13 #include "SkColorPriv.h"
14 #include "SkColorFilter.h"
15 #include "SkImage.h"
16 #include "SkRandom.h"
17 #include "SkTime.h"
18 #include "SkTypeface.h"
19 #include "Timer.h"
20
21 #if SK_SUPPORT_GPU
22 #include "GrContext.h"
23 #endif
24
25 // Create an animation of a bunch of letters that rotate in place. This is intended to stress
26 // the glyph atlas and test that we don't see corruption or bad slowdowns.
27 class FlutterAnimateView : public SampleView {
28 public:
FlutterAnimateView()29 FlutterAnimateView() : fCurrTime(0), fResetTime(0) {}
30
31 protected:
onOnceBeforeDraw()32 void onOnceBeforeDraw() override {
33 fTypeface = SkTypeface::MakeFromFile("/skimages/samplefont.ttf");
34 initChars();
35 }
36
37 // overrides from SkEventSink
onQuery(SkEvent * evt)38 bool onQuery(SkEvent* evt) override {
39 if (SampleCode::TitleQ(*evt)) {
40 SampleCode::TitleR(evt, "FlutterAnimate");
41 return true;
42 }
43
44 return this->INHERITED::onQuery(evt);
45 }
46
onDrawContent(SkCanvas * canvas)47 void onDrawContent(SkCanvas* canvas) override {
48 SkPaint paint;
49 paint.setTypeface(fTypeface);
50 paint.setAntiAlias(true);
51 paint.setFilterQuality(kMedium_SkFilterQuality);
52 paint.setTextSize(50);
53
54 // rough center of each glyph
55 static constexpr auto kMidX = 35;
56 static constexpr auto kMidY = 50;
57
58 canvas->clear(SK_ColorWHITE);
59 for (int i = 0; i < kNumChars; ++i) {
60 canvas->save();
61 double rot = SkScalarInterp(fChars[i].fStartRotation, fChars[i].fEndRotation,
62 fCurrTime/kDuration);
63 canvas->translate(fChars[i].fPosition.fX + kMidX, fChars[i].fPosition.fY - kMidY);
64 canvas->rotate(SkRadiansToDegrees(rot));
65 canvas->translate(-35,+50);
66 canvas->drawString(fChars[i].fChar, 0, 0, paint);
67 canvas->restore();
68 }
69 }
70
onAnimate(const SkAnimTimer & timer)71 bool onAnimate(const SkAnimTimer& timer) override {
72 fCurrTime = timer.secs() - fResetTime;
73 if (fCurrTime > kDuration) {
74 this->initChars();
75 fResetTime = timer.secs();
76 fCurrTime = 0;
77 }
78
79 return true;
80 }
81
82 private:
initChars()83 void initChars() {
84 for (int i = 0; i < kNumChars; ++i) {
85 char c = fRand.nextULessThan(26) + 65;
86 fChars[i].fChar[0] = c;
87 fChars[i].fChar[1] = '\0';
88 fChars[i].fPosition = SkPoint::Make(fRand.nextF()*748 + 10, fRand.nextF()*1004 + 10);
89 fChars[i].fStartRotation = fRand.nextF();
90 fChars[i].fEndRotation = fRand.nextF() * 20 - 10;
91 }
92 }
93
94 static constexpr double kDuration = 5.0;
95 double fCurrTime;
96 double fResetTime;
97 SkRandom fRand;
98
99 struct AnimatedChar {
100 char fChar[2];
101 SkPoint fPosition;
102 SkScalar fStartRotation;
103 SkScalar fEndRotation;
104 };
105 sk_sp<SkTypeface> fTypeface;
106 static constexpr int kNumChars = 40;
107 AnimatedChar fChars[kNumChars];
108
109 typedef SampleView INHERITED;
110 };
111
112 //////////////////////////////////////////////////////////////////////////////
113
MyFactory()114 static SkView* MyFactory() { return new FlutterAnimateView; }
115 static SkViewRegister reg(MyFactory);
116