pjs/widget/gonk/OrientationObserver.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et ft=cpp : */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "base/basictypes.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Hal.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "OrientationObserver.h"
using namespace mozilla;
using namespace dom;
namespace {
struct OrientationMapping {
PRUint32 mScreenRotation;
ScreenOrientation mDomOrientation;
};
static OrientationMapping sOrientationMappings[] = {
{nsIScreen::ROTATION_0_DEG, eScreenOrientation_PortraitPrimary},
{nsIScreen::ROTATION_180_DEG, eScreenOrientation_PortraitSecondary},
{nsIScreen::ROTATION_0_DEG, eScreenOrientation_Portrait},
{nsIScreen::ROTATION_90_DEG, eScreenOrientation_LandscapePrimary},
{nsIScreen::ROTATION_270_DEG, eScreenOrientation_LandscapeSecondary},
{nsIScreen::ROTATION_90_DEG, eScreenOrientation_Landscape}
};
const static int sDefaultLandscape = 3;
const static int sDefaultPortrait = 0;
static PRUint32 sOrientationOffset = 0;
static already_AddRefed<nsIScreen>
GetPrimaryScreen()
{
nsCOMPtr<nsIScreenManager> screenMgr =
do_GetService("@mozilla.org/gfx/screenmanager;1");
NS_ENSURE_TRUE(screenMgr, nsnull);
nsCOMPtr<nsIScreen> screen;
screenMgr->GetPrimaryScreen(getter_AddRefs(screen));
return screen.forget();
}
static void
DetectDefaultOrientation()
{
nsCOMPtr<nsIScreen> screen = GetPrimaryScreen();
if (!screen) {
return;
}
PRInt32 left, top, width, height;
if (NS_FAILED(screen->GetRect(&left, &top, &width, &height))) {
return;
}
PRUint32 rotation;
if (NS_FAILED(screen->GetRotation(&rotation))) {
return;
}
if (width < height) {
if (rotation == nsIScreen::ROTATION_0_DEG ||
rotation == nsIScreen::ROTATION_180_DEG) {
sOrientationOffset = sDefaultPortrait;
} else {
sOrientationOffset = sDefaultLandscape;
}
} else {
if (rotation == nsIScreen::ROTATION_0_DEG ||
rotation == nsIScreen::ROTATION_180_DEG) {
sOrientationOffset = sDefaultLandscape;
} else {
sOrientationOffset = sDefaultPortrait;
}
}
}
/**
* Converts DOM orientation to nsIScreen rotation. Portrait and Landscape are
* treated as PortraitPrimary and LandscapePrimary, respectively, during
* conversion.
*
* @param aOrientation DOM orientation e.g.
* dom::eScreenOrientation_PortraitPrimary.
* @param aResult output nsIScreen rotation e.g. nsIScreen::ROTATION_0_DEG.
* @return NS_OK on success. NS_ILLEGAL_VALUE on failure.
*/
static nsresult
ConvertToScreenRotation(ScreenOrientation aOrientation, PRUint32 *aResult)
{
for (int i = 0; i < ArrayLength(sOrientationMappings); i++) {
if (aOrientation == sOrientationMappings[i].mDomOrientation) {
// Shift the mappings in sOrientationMappings so devices with default
// landscape orientation map landscape-primary to 0 degree and so forth.
int adjusted = (i + sOrientationOffset) %
ArrayLength(sOrientationMappings);
*aResult = sOrientationMappings[adjusted].mScreenRotation;
return NS_OK;
}
}
*aResult = nsIScreen::ROTATION_0_DEG;
return NS_ERROR_ILLEGAL_VALUE;
}
/**
* Converts nsIScreen rotation to DOM orientation.
*
* @param aRotation nsIScreen rotation e.g. nsIScreen::ROTATION_0_DEG.
* @param aResult output DOM orientation e.g.
* dom::eScreenOrientation_PortraitPrimary.
* @return NS_OK on success. NS_ILLEGAL_VALUE on failure.
*/
nsresult
ConvertToDomOrientation(PRUint32 aRotation, ScreenOrientation *aResult)
{
for (int i = 0; i < ArrayLength(sOrientationMappings); i++) {
if (aRotation == sOrientationMappings[i].mScreenRotation) {
// Shift the mappings in sOrientationMappings so devices with default
// landscape orientation map 0 degree to landscape-primary and so forth.
int adjusted = (i + sOrientationOffset) %
ArrayLength(sOrientationMappings);
*aResult = sOrientationMappings[adjusted].mDomOrientation;
return NS_OK;
}
}
*aResult = eScreenOrientation_None;
return NS_ERROR_ILLEGAL_VALUE;
}
// Note that all operations with sOrientationSensorObserver
// should be on the main thread.
static nsAutoPtr<OrientationObserver> sOrientationSensorObserver;
} // Anonymous namespace
OrientationObserver*
OrientationObserver::GetInstance()
{
if (!sOrientationSensorObserver) {
sOrientationSensorObserver = new OrientationObserver();
ClearOnShutdown(&sOrientationSensorObserver);
}
return sOrientationSensorObserver;
}
OrientationObserver::OrientationObserver()
: mAutoOrientationEnabled(false)
, mLastUpdate(0)
, mAllowedOrientations(sDefaultOrientations)
{
DetectDefaultOrientation();
EnableAutoOrientation();
}
OrientationObserver::~OrientationObserver()
{
if (mAutoOrientationEnabled) {
DisableAutoOrientation();
}
}
void
OrientationObserver::Notify(const hal::SensorData& aSensorData)
{
// Sensor will call us on the main thread.
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aSensorData.sensor() == SensorType::SENSOR_ORIENTATION);
InfallibleTArray<float> values = aSensorData.values();
// Azimuth (values[0]): the device's horizontal orientation
// (0 degree is north). It's unused for screen rotation.
float pitch = values[1];
float roll = values[2];
PRUint32 rotation;
if (roll > 45) {
rotation = nsIScreen::ROTATION_90_DEG;
} else if (roll < -45) {
rotation = nsIScreen::ROTATION_270_DEG;
} else if (pitch < -45) {
rotation = nsIScreen::ROTATION_0_DEG;
} else if (pitch > 45) {
rotation = nsIScreen::ROTATION_180_DEG;
} else {
// Don't rotate if neither pitch nor roll exceeds the 45 degree threshold.
return;
}
nsCOMPtr<nsIScreen> screen = GetPrimaryScreen();
if (!screen) {
return;
}
PRUint32 currRotation;
if (NS_FAILED(screen->GetRotation(&currRotation)) ||
rotation == currRotation) {
return;
}
ScreenOrientation orientation;
if (NS_FAILED(ConvertToDomOrientation(rotation, &orientation))) {
return;
}
if ((mAllowedOrientations & orientation) == eScreenOrientation_None) {
// The orientation from sensor is not allowed.
return;
}
PRTime now = PR_Now();
MOZ_ASSERT(now > mLastUpdate);
if (now - mLastUpdate < sMinUpdateInterval) {
return;
}
mLastUpdate = now;
if (NS_FAILED(screen->SetRotation(rotation))) {
// Don't notify dom on rotation failure.
return;
}
}
/**
* Register the observer. Note that the observer shouldn't be registered.
*/
void
OrientationObserver::EnableAutoOrientation()
{
MOZ_ASSERT(NS_IsMainThread() && !AutoOrientationEnabled());
hal::RegisterSensorObserver(hal::SENSOR_ORIENTATION, this);
mAutoOrientationEnabled = true;
}
/**
* Unregister the observer. Note that the observer should already be registered.
*/
void
OrientationObserver::DisableAutoOrientation()
{
MOZ_ASSERT(NS_IsMainThread() && mAutoOrientationEnabled);
hal::UnregisterSensorObserver(hal::SENSOR_ORIENTATION, this);
mAutoOrientationEnabled = false;
}
bool
OrientationObserver::LockScreenOrientation(ScreenOrientation aOrientation)
{
MOZ_ASSERT(eScreenOrientation_None < aOrientations &&
aOrientations < eScreenOrientation_EndGuard);
// Enable/disable the observer depending on 1. multiple orientations
// allowed, and 2. observer enabled.
if (aOrientation == eScreenOrientation_Landscape ||
aOrientation == eScreenOrientation_Portrait) {
if (!mAutoOrientationEnabled) {
EnableAutoOrientation();
}
} else if (mAutoOrientationEnabled) {
DisableAutoOrientation();
}
mAllowedOrientations = aOrientation;
nsCOMPtr<nsIScreen> screen = GetPrimaryScreen();
NS_ENSURE_TRUE(screen, false);
PRUint32 currRotation;
nsresult rv = screen->GetRotation(&currRotation);
NS_ENSURE_SUCCESS(rv, false);
ScreenOrientation currOrientation = eScreenOrientation_None;
rv = ConvertToDomOrientation(currRotation, &currOrientation);
NS_ENSURE_SUCCESS(rv, false);
// Don't rotate if the current orientation matches one of the
// requested orientations.
if (currOrientation & aOrientation) {
return true;
}
// Return false on invalid orientation value.
PRUint32 rotation;
rv = ConvertToScreenRotation(aOrientation, &rotation);
NS_ENSURE_SUCCESS(rv, false);
rv = screen->SetRotation(rotation);
NS_ENSURE_SUCCESS(rv, false);
// This conversion will disambiguate aOrientation.
ScreenOrientation orientation;
rv = ConvertToDomOrientation(rotation, &orientation);
NS_ENSURE_SUCCESS(rv, false);
return true;
}
void
OrientationObserver::UnlockScreenOrientation()
{
if (!mAutoOrientationEnabled) {
EnableAutoOrientation();
}
mAllowedOrientations = sDefaultOrientations;
}