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18fae65f38
This requires replacing inclusions of it with inclusions of more specific prefs files. The exception is that StaticPrefsAll.h, which is equivalent to StaticPrefs.h, and is used in `Codegen.py` because doing something smarter is tricky and suitable for a follow-up. As a result, any change to StaticPrefList.yaml will still trigger recompilation of all the generated DOM bindings files, but that's still a big improvement over trigger recompilation of every file that uses static prefs. Most of the changes in this commit are very boring. The only changes that are not boring are modules/libpref/*, Codegen.py, and ServoBindings.toml. Differential Revision: https://phabricator.services.mozilla.com/D39138 --HG-- extra : moz-landing-system : lando
95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ScrollVelocityQueue.h"
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#include "mozilla/StaticPrefs_apz.h"
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#include "mozilla/StaticPrefs_layout.h"
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#include "nsPresContext.h"
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#include "nsRefreshDriver.h"
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namespace mozilla {
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namespace layout {
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void ScrollVelocityQueue::Sample(const nsPoint& aScrollPosition) {
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float flingSensitivity =
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StaticPrefs::layout_css_scroll_snap_prediction_sensitivity();
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int maxVelocity =
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StaticPrefs::layout_css_scroll_snap_prediction_max_velocity();
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maxVelocity = nsPresContext::CSSPixelsToAppUnits(maxVelocity);
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int maxOffset = maxVelocity * flingSensitivity;
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TimeStamp currentRefreshTime =
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mPresContext->RefreshDriver()->MostRecentRefresh();
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if (mSampleTime.IsNull()) {
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mAccumulator = nsPoint();
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} else {
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uint32_t durationMs = (currentRefreshTime - mSampleTime).ToMilliseconds();
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if (durationMs > StaticPrefs::apz_velocity_relevance_time_ms()) {
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mAccumulator = nsPoint();
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mQueue.Clear();
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} else if (durationMs == 0) {
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mAccumulator += aScrollPosition - mLastPosition;
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} else {
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nsPoint velocity = mAccumulator * 1000 / durationMs;
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velocity.Clamp(maxVelocity);
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mQueue.AppendElement(std::make_pair(durationMs, velocity));
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mAccumulator = aScrollPosition - mLastPosition;
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}
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}
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mAccumulator.Clamp(maxOffset);
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mSampleTime = currentRefreshTime;
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mLastPosition = aScrollPosition;
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TrimQueue();
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}
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void ScrollVelocityQueue::TrimQueue() {
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if (mSampleTime.IsNull()) {
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// There are no samples, nothing to do here.
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return;
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}
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TimeStamp currentRefreshTime =
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mPresContext->RefreshDriver()->MostRecentRefresh();
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nsPoint velocity;
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uint32_t timeDelta = (currentRefreshTime - mSampleTime).ToMilliseconds();
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for (int i = mQueue.Length() - 1; i >= 0; i--) {
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timeDelta += mQueue[i].first;
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if (timeDelta >= StaticPrefs::apz_velocity_relevance_time_ms()) {
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// The rest of the samples have expired and should be dropped
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for (; i >= 0; i--) {
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mQueue.RemoveElementAt(0);
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}
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}
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}
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}
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void ScrollVelocityQueue::Reset() {
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mAccumulator = nsPoint();
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mSampleTime = TimeStamp();
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mQueue.Clear();
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}
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/**
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Calculate the velocity of the scroll frame, in appunits / second.
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*/
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nsPoint ScrollVelocityQueue::GetVelocity() {
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TrimQueue();
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if (mQueue.Length() == 0) {
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// If getting the scroll velocity before any scrolling has occurred,
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// the velocity must be (0, 0)
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return nsPoint();
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}
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nsPoint velocity;
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for (int i = mQueue.Length() - 1; i >= 0; i--) {
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velocity += mQueue[i].second;
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}
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return velocity / mQueue.Length();
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;
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}
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} // namespace layout
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} // namespace mozilla
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