1 files changed, 115 insertions, 0 deletions
diff --git a/samplecode/SampleFlutterAnimate.cpp b/samplecode/SampleFlutterAnimate.cpp
new file mode 100644
index 0000000000..813572934e
--- /dev/null
+++ b/samplecode/SampleFlutterAnimate.cpp
@@ -0,0 +1,115 @@
+/*
+ * 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 "SampleCode.h"
+#include "SkAnimTimer.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkUtils.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkImage.h"
+#include "SkRandom.h"
+#include "SkTime.h"
+#include "SkTypeface.h"
+#include "Timer.h"
+
+#if SK_SUPPORT_GPU
+#include "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 SampleView {
+public:
+    FlutterAnimateView() : fCurrTime(0), fResetTime(0) {}
+
+protected:
+    void onOnceBeforeDraw() override {
+        fTypeface = SkTypeface::MakeFromFile("/skimages/samplefont.ttf");
+        initChars();
+    }
+
+    // overrides from SkEventSink
+    bool onQuery(SkEvent* evt) override {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "FlutterAnimate");
+            return true;
+        }
+
+        return this->INHERITED::onQuery(evt);
+    }
+
+    void onDrawContent(SkCanvas* canvas) override {
+        SkPaint paint;
+        paint.setTypeface(fTypeface);
+        paint.setAntiAlias(true);
+        paint.setFilterQuality(kMedium_SkFilterQuality);
+        paint.setTextSize(50);
+
+        // 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, paint);
+            canvas->restore();
+        }
+    }
+
+    bool onAnimate(const SkAnimTimer& timer) override {
+        fCurrTime = timer.secs() - fResetTime;
+        if (fCurrTime > kDuration) {
+            this->initChars();
+            fResetTime = timer.secs();
+            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 SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new FlutterAnimateView; }
+static SkViewRegister reg(MyFactory);