Create VisualStreamTimingModule

tools/VisualBench/VisualStreamTimingModule.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ */
+
+#ifndef VisualStreamTimingModule_DEFINED
+#define VisualStreamTimingModule_DEFINED
+
+#include "VisualModule.h"
+
+#include "TimingStateMachine.h"
+#include "VisualBench.h"
+#include "VisualBenchmarkStream.h"
+
+/*
+ * VisualStreamTimingModule is the base class for modules which want to time a stream of Benchmarks

[robertphillips, 2015/10/06 12:19:46]

This could use some more documentation. How is it used, etc. 

[joshualitt, 2015/10/07 19:33:53]

Acknowledged.

+ */
+class VisualStreamTimingModule : public VisualModule {
+public:
+    VisualStreamTimingModule(VisualBench* owner, bool preWarmBeforeSample);
+    void draw(SkCanvas* canvas) override;
+
+private:
+    virtual void renderFrame(SkCanvas*, Benchmark*, int loops)=0;
+
+    // subclasses should return true to advance the stream
+    virtual bool timingFinished(Benchmark*, int loops, double measurement)=0;
+
+    bool nextBenchmarkIfNecessary(SkCanvas*);
+
+    TimingStateMachine fTSM;
+    SkAutoTDelete<VisualBenchmarkStream> fBenchmarkStream;

[robertphillips, 2015/10/06 12:19:46]

Can the VisualBenchmarkStream not return the current bench (i.e., do we need
'fBenchmark') ?

[joshualitt, 2015/10/07 19:33:53]

Will fix in a follow on.

+    SkAutoTUnref<Benchmark> fBenchmark;

[robertphillips, 2015/10/06 12:19:46]

// What does 'fHasBeenReset' mean ?

[joshualitt, 2015/10/07 19:33:53]

Acknowledged.

+    bool fHasBeenReset;
+    bool fPreWarmBeforeSample;
+
+    // support framework
+    SkAutoTUnref<VisualBench> fOwner;
+
+    typedef VisualModule INHERITED;
+};
+
+#endif