gecko/dom/system/windows/nsAccelerometerSystem.cpp

170 lines
4.9 KiB
C++

/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Doug Turner <dougt@dougt.org>
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jesper Kristensen <mail@jesperkristensen.dk>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsAccelerometerSystem.h"
#include "nsIServiceManager.h"
#include "windows.h"
////////////////////////////
// ThinkPad
////////////////////////////
typedef struct {
int status; // Current internal state
unsigned short x; // raw value
unsigned short y; // raw value
unsigned short xx; // avg. of 40ms
unsigned short yy; // avg. of 40ms
char temp; // raw value (could be deg celsius?)
unsigned short x0; // Used for "auto-center"
unsigned short y0; // Used for "auto-center"
} ThinkPadAccelerometerData;
typedef void (__stdcall *ShockproofGetAccelerometerData)(ThinkPadAccelerometerData*);
ShockproofGetAccelerometerData gShockproofGetAccelerometerData = nsnull;
class ThinkPadSensor : public Sensor
{
public:
ThinkPadSensor();
~ThinkPadSensor();
PRBool Startup();
void Shutdown();
void GetValues(double *x, double *y, double *z);
private:
HMODULE mLibrary;
};
ThinkPadSensor::ThinkPadSensor()
{
}
ThinkPadSensor::~ThinkPadSensor()
{
}
PRBool
ThinkPadSensor::Startup()
{
mLibrary = LoadLibraryW(L"sensor.dll");
if (!mLibrary)
return PR_FALSE;
gShockproofGetAccelerometerData = (ShockproofGetAccelerometerData)
GetProcAddress(mLibrary, "ShockproofGetAccelerometerData");
if (!gShockproofGetAccelerometerData) {
FreeLibrary(mLibrary);
mLibrary = nsnull;
return PR_FALSE;
}
return PR_TRUE;
}
void
ThinkPadSensor::Shutdown()
{
NS_ASSERTION(mLibrary, "Shutdown called when mLibrary is null?");
FreeLibrary(mLibrary);
mLibrary = nsnull;
gShockproofGetAccelerometerData = nsnull;
}
void
ThinkPadSensor::GetValues(double *x, double *y, double *z)
{
ThinkPadAccelerometerData accelData;
gShockproofGetAccelerometerData(&accelData);
// accelData.x and accelData.y is the acceleration measured from the accelerometer.
// x and y is switched from what we use, and the accelerometer does not support z axis.
// Balance point (526, 528) and 90 degree tilt (144) determined experimentally.
*x = ((double)(accelData.y - 526)) / 144;
*y = ((double)(accelData.x - 528)) / 144;
*z = 1.0;
}
nsAccelerometerSystem::nsAccelerometerSystem(){}
nsAccelerometerSystem::~nsAccelerometerSystem(){}
void
nsAccelerometerSystem::UpdateHandler(nsITimer *aTimer, void *aClosure)
{
nsAccelerometerSystem *self = reinterpret_cast<nsAccelerometerSystem *>(aClosure);
if (!self || !self->mSensor) {
NS_ERROR("no self or sensor");
return;
}
double x, y, z;
self->mSensor->GetValues(&x, &y, &z);
self->AccelerationChanged(x, y, z);
}
void nsAccelerometerSystem::Startup()
{
NS_ASSERTION(!mSensor, "mSensor should be null. Startup called twice?");
PRBool started = PR_FALSE;
mSensor = new ThinkPadSensor();
if (mSensor)
started = mSensor->Startup();
if (!started)
return;
mUpdateTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mUpdateTimer)
mUpdateTimer->InitWithFuncCallback(UpdateHandler,
this,
mUpdateInterval,
nsITimer::TYPE_REPEATING_SLACK);
}
void nsAccelerometerSystem::Shutdown()
{
if (mUpdateTimer) {
mUpdateTimer->Cancel();
mUpdateTimer = nsnull;
}
if (mSensor)
mSensor->Shutdown();
}