Android Build Tools

Android/android-ndk-r27d/sources/android/ndk_helper/perfMonitor.cpp

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+/*
+ * Copyright 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "perfMonitor.h"
+
+namespace ndk_helper
+{
+
+PerfMonitor::PerfMonitor() :
+                last_tick_( 0.f ),
+                tv_last_sec_( 0 ),
+                tickindex_( 0 ),
+                ticksum_( 0 )
+{
+    for( int32_t i = 0; i < NUM_SAMPLES; ++i )
+        ticklist_[i] = 0;
+}
+
+PerfMonitor::~PerfMonitor()
+{
+}
+
+double PerfMonitor::UpdateTick( double currentTick )
+{
+    ticksum_ -= ticklist_[tickindex_];
+    ticksum_ += currentTick;
+    ticklist_[tickindex_] = currentTick;
+    tickindex_ = (tickindex_ + 1) % NUM_SAMPLES;
+
+    return ((double) ticksum_ / NUM_SAMPLES);
+}
+
+bool PerfMonitor::Update( float &fFPS )
+{
+    struct timeval Time;
+    gettimeofday( &Time, NULL );
+
+    double time = Time.tv_sec + Time.tv_usec * 1.0 / 1000000.0;
+    double tick = time - last_tick_;
+    double d = UpdateTick( tick );
+    last_tick_ = time;
+
+    if( Time.tv_sec - tv_last_sec_ >= 1 )
+    {
+        double time = Time.tv_sec + Time.tv_usec * 1.0 / 1000000.0;
+        current_FPS_ = 1.f / d;
+        tv_last_sec_ = Time.tv_sec;
+        fFPS = current_FPS_;
+        return true;
+    }
+    else
+    {
+        fFPS = current_FPS_;
+        return false;
+    }
+}
+
+}   //namespace ndkHelper
+