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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /gfx/layers/apz/src/SimpleVelocityTracker.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/layers/apz/src/SimpleVelocityTracker.h')
-rw-r--r-- | gfx/layers/apz/src/SimpleVelocityTracker.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/SimpleVelocityTracker.h b/gfx/layers/apz/src/SimpleVelocityTracker.h new file mode 100644 index 0000000000..1778dee065 --- /dev/null +++ b/gfx/layers/apz/src/SimpleVelocityTracker.h @@ -0,0 +1,54 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/. */ + +#ifndef mozilla_layers_VelocityTracker_h +#define mozilla_layers_VelocityTracker_h + +#include <utility> +#include <cstdint> + +#include "Axis.h" +#include "mozilla/Attributes.h" +#include "nsTArray.h" + +namespace mozilla { +namespace layers { + +class SimpleVelocityTracker : public VelocityTracker { + public: + explicit SimpleVelocityTracker(Axis* aAxis); + void StartTracking(ParentLayerCoord aPos, TimeStamp aTimestamp) override; + Maybe<float> AddPosition(ParentLayerCoord aPos, + TimeStamp aTimestamp) override; + Maybe<float> ComputeVelocity(TimeStamp aTimestamp) override; + void Clear() override; + + private: + void AddVelocityToQueue(TimeStamp aTimestamp, float aVelocity); + float ApplyFlingCurveToVelocity(float aVelocity) const; + + // The Axis that uses this velocity tracker. + // This is a raw pointer because the Axis owns the velocity tracker + // by UniquePtr, so the velocity tracker cannot outlive the Axis. + Axis* MOZ_NON_OWNING_REF mAxis; + + // A queue of (timestamp, velocity) pairs; these are the historical + // velocities at the given timestamps. Velocities are in screen pixels per ms. + // This member can only be accessed on the controller/UI thread. + nsTArray<std::pair<TimeStamp, float>> mVelocityQueue; + + // mVelocitySampleTime and mVelocitySamplePos are the time and position + // used in the last velocity sampling. They get updated when a new sample is + // taken (which may not happen on every input event, if the time delta is too + // small). + TimeStamp mVelocitySampleTime; + ParentLayerCoord mVelocitySamplePos; +}; + +} // namespace layers +} // namespace mozilla + +#endif |