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-rw-r--r--widget/gonk/GeckoTouchDispatcher.h99
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diff --git a/widget/gonk/GeckoTouchDispatcher.h b/widget/gonk/GeckoTouchDispatcher.h
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--- a/widget/gonk/GeckoTouchDispatcher.h
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-/* -*- 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 "mozilla/RefPtr.h"
-
-class nsIWidget;
-
-namespace mozilla {
-namespace layers {
-class CompositorVsyncScheduler;
-}
-
-// 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 final
-{
- NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GeckoTouchDispatcher)
-
-public:
- static GeckoTouchDispatcher* GetInstance();
- void NotifyTouch(MultiTouchInput& aTouch, TimeStamp aEventTime);
- void DispatchTouchEvent(MultiTouchInput aMultiTouch);
- void DispatchTouchNonMoveEvent(MultiTouchInput aInput);
- void DispatchTouchMoveEvents(TimeStamp aVsyncTime);
- void NotifyVsync(TimeStamp aVsyncTimestamp);
- void SetCompositorVsyncScheduler(layers::CompositorVsyncScheduler* aObserver);
-
-protected:
- ~GeckoTouchDispatcher() {}
-
-private:
- GeckoTouchDispatcher();
- void ResampleTouchMoves(MultiTouchInput& aOutTouch, TimeStamp vsyncTime);
- void SendTouchEvent(MultiTouchInput& aData);
- void DispatchMouseEvent(MultiTouchInput& aMultiTouch,
- bool aForwardToChildren);
-
- // mTouchQueueLock is used to protect the vector and state below
- // as it is accessed on multiple threads.
- Mutex mTouchQueueLock;
- std::vector<MultiTouchInput> mTouchMoveEvents;
- bool mHavePendingTouchMoves;
- int mInflightNonMoveEvents;
- // end stuff protected by mTouchQueueLock
-
- 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
- TimeDuration mMinDelta; // Minimal time difference between touches for resampling
-
- // 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;
-
- RefPtr<layers::CompositorVsyncScheduler> mCompositorVsyncScheduler;
-};
-
-} // namespace mozilla
-
-#endif // GECKO_TOUCH_INPUT_DISPATCHER_h