Say hello to Qt Android Sensors based on NDK API

Until Qt 5.9, we had to use JNI way because the NDK sensors API was
introduced in API-16. Starting with Qt 5.9 we can safely use the NDK API
as API_16 is the minimum API supported by Qt.
Using the NDK API instead of JNI boost the performance a lot! The CPU
usage dropped 2 to 4 times, from over 60% using the JNI to less than
20%.

[ChangeLog][Android] Rewrite Qt Android Sensors using NDK
API.

Change-Id: If3e3f1e56973e2a189662912b2a6ebfbd71dee14
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>

1 files changed, 0 insertions, 177 deletions

diff --git a/src/plugins/sensors/android/src/androidcompass.cpp b/src/plugins/sensors/android/src/androidcompass.cpp
deleted file mode 100644
index 0911d901..00000000
--- a/src/plugins/sensors/android/src/androidcompass.cpp
+++ /dev/null
@@ -1,177 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtSensors module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "androidcompass.h"
-
-#include <QDebug>
-#include <qmath.h>
-#include "androidjnisensors.h"
-
-
-class AndroidAccelerometerListener : public AndroidSensors::AndroidSensorsListenerInterface
-{
-public:
-
-    AndroidAccelerometerListener(AndroidCompass *parent)
-        : accuracy(0), m_compass(parent)
-    {
-        memset(reading, 0, sizeof(reading));
-    }
-
-    void start(int dataRate)
-    {
-        AndroidSensors::registerListener(AndroidSensors::TYPE_ACCELEROMETER, this, dataRate);
-    }
-
-    void stop()
-    {
-        AndroidSensors::unregisterListener(AndroidSensors::TYPE_ACCELEROMETER, this);
-    }
-
-    void onAccuracyChanged(jint value) override
-    {
-        accuracy = value;
-    }
-
-    void onSensorChanged(jlong /*timestamp*/, const jfloat *values, uint size) override
-    {
-        if (size < 3)
-            return;
-        reading[0] = values[0];
-        reading[1] = values[1];
-        reading[2] = values[2];
-        m_compass->testStuff();
-    }
-
-    jfloat reading[3];
-    jint accuracy;
-
-private:
-    AndroidCompass *m_compass;
-};
-
-class AndroidMagnetometerListener : public AndroidSensors::AndroidSensorsListenerInterface
-{
-public:
-    AndroidMagnetometerListener(AndroidCompass *parent)
-        : accuracy(0), m_compass(parent)
-    {
-        memset(reading, 0, sizeof(reading));
-    }
-
-    void start(int dataRate)
-    {
-        AndroidSensors::registerListener(AndroidSensors::TYPE_MAGNETIC_FIELD, this, dataRate);
-    }
-
-    void stop()
-    {
-        AndroidSensors::unregisterListener(AndroidSensors::TYPE_MAGNETIC_FIELD, this);
-    }
-
-    void onAccuracyChanged(jint value) override
-    {
-        accuracy = value;
-    }
-
-    void onSensorChanged(jlong /*timestamp*/, const jfloat *values, uint size) override
-    {
-        if (size < 3)
-            return;
-        reading[0] = values[0];
-        reading[1] = values[1];
-        reading[2] = values[2];
-        m_compass->testStuff();
-    }
-
-    jfloat reading[3];
-    jint accuracy;
-private:
-    AndroidCompass *m_compass;
-};
-
-char const * const AndroidCompass::id("android.synthetic.compass");
-
-AndroidCompass::AndroidCompass(QSensor *sensor)
-    : QSensorBackend(sensor), m_accelerometerListener(0), m_magnetometerListener(0), m_isStarted(false)
-{
-    setReading<QCompassReading>(&m_reading);
-    m_isStarted = false;
-}
-
-AndroidCompass::~AndroidCompass()
-{
-    if (m_isStarted)
-        stop();
-    delete m_accelerometerListener;
-    delete m_magnetometerListener;
-}
-
-void AndroidCompass::start()
-{
-    if (!m_accelerometerListener)
-        m_accelerometerListener = new AndroidAccelerometerListener(this);
-    if (!m_magnetometerListener)
-        m_magnetometerListener = new AndroidMagnetometerListener(this);
-    m_accelerometerListener->start(sensor()->dataRate());
-    m_magnetometerListener->start(sensor()->dataRate());
-
-    m_isStarted = true;
-}
-
-void AndroidCompass::stop()
-{
-    if (m_isStarted) {
-        m_isStarted = false;
-        m_accelerometerListener->stop();
-        m_magnetometerListener->stop();
-    }
-}
-
-void AndroidCompass::testStuff()
-{
-    if (!m_accelerometerListener || !m_magnetometerListener)
-        return;
-    qreal azimuth = AndroidSensors::getCompassAzimuth(m_accelerometerListener->reading, m_magnetometerListener->reading);
-
-    m_reading.setAzimuth(qRadiansToDegrees(azimuth));
-    const qreal accuracyValue = (m_accelerometerListener->accuracy + m_magnetometerListener->accuracy) / 6;
-    m_reading.setCalibrationLevel(accuracyValue);
-    newReadingAvailable();
-}