gecko/widget/gonk/GeckoTouchDispatcher.h

93 lines
3.4 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sts=2 et sw=2 tw=80: */
/* Copyright 2014 Mozilla Foundation and Mozilla contributors
*
* 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.
*/
#ifndef GECKO_TOUCH_INPUT_DISPATCHER_h
#define GECKO_TOUCH_INPUT_DISPATCHER_h
#include "InputData.h"
#include "Units.h"
#include "mozilla/Mutex.h"
#include <vector>
#include "nsRefPtr.h"
class nsIWidget;
namespace mozilla {
class WidgetMouseEvent;
namespace layers {
class CompositorVsyncObserver;
}
// Used to resample touch events whenever a vsync event occurs. It batches
// touch moves and on every vsync, resamples the touch position to create smooth
// scrolls. We use the Android touch resample algorithm. It uses a combination of
// extrapolation and interpolation. The algorithm takes the vsync time and
// subtracts mVsyncAdjust time in ms and creates a sample time. All touch events are
// relative to this sample time. If the last touch event occurs AFTER this
// sample time, interpolate the last two touch events. If the last touch event occurs BEFORE
// this sample time, we extrapolate the last two touch events to the sample
// time. The magic numbers defined as constants are taken from android
// InputTransport.cpp.
class GeckoTouchDispatcher
{
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GeckoTouchDispatcher)
public:
GeckoTouchDispatcher();
void NotifyTouch(MultiTouchInput& aTouch, TimeStamp aEventTime);
void DispatchTouchEvent(MultiTouchInput& aMultiTouch);
void DispatchTouchMoveEvents(TimeStamp aVsyncTime);
static bool NotifyVsync(TimeStamp aVsyncTimestamp);
static void SetCompositorVsyncObserver(layers::CompositorVsyncObserver* aObserver);
private:
void ResampleTouchMoves(MultiTouchInput& aOutTouch, TimeStamp vsyncTime);
void SendTouchEvent(MultiTouchInput& aData);
void DispatchMouseEvent(MultiTouchInput& aMultiTouch,
bool aForwardToChildren);
WidgetMouseEvent ToWidgetMouseEvent(const MultiTouchInput& aData, nsIWidget* aWidget) const;
// mTouchQueueLock are used to protect the vector below
// as it is accessed on the vsync thread and main thread
Mutex mTouchQueueLock;
std::vector<MultiTouchInput> mTouchMoveEvents;
bool mResamplingEnabled;
bool mTouchEventsFiltered;
bool mEnabledUniformityInfo;
// All times below are in nanoseconds
TimeDuration mVsyncAdjust; // Time from vsync we create sample times from
TimeDuration mMaxPredict; // How far into the future we're allowed to extrapolate
// Amount of time between vsync and the last event that is required before we
// resample
TimeDuration mMinResampleTime;
// Threshold if a vsync event runs too far behind touch events
TimeDuration mDelayedVsyncThreshold;
// How far ahead can vsync events get ahead of touch events.
TimeDuration mOldTouchThreshold;
nsRefPtr<layers::CompositorVsyncObserver> mCompositorVsyncObserver;
};
} // namespace mozilla
#endif // GECKO_TOUCH_INPUT_DISPATCHER_h