mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-07 04:05:49 +00:00
85 lines
3.2 KiB
C++
85 lines
3.2 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>
|
|
|
|
class nsIWidget;
|
|
|
|
namespace mozilla {
|
|
class WidgetMouseEvent;
|
|
|
|
// 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);
|
|
|
|
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;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
#endif // GECKO_TOUCH_INPUT_DISPATCHER_h
|