9f2cb0ae1b
Effects are given the interval between two consecutive frames. The main
flaw of this approach is that if the Compositor transitions from the idle
state to "active" state, i.e. when there is something to repaint,
effects may see a very large interval between the last painted frame and
the current. In order to address this issue, the Scene invalidates the
timer that is used to measure time between consecutive frames before the
Compositor is about to become idle.
While this works perfectly fine with Xinerama-style rendering, with per
screen rendering, determining whether the compositor is about to idle is
rather a tedious task mostly because a single output can't be used for
the test.
Furthermore, since the Compositor schedules pointless repaints just to
ensure that it's idle, it might take several attempts to figure out
whether the scene timer must be invalidated if you use (true) per screen
rendering.
Ideally, all effects should use a timeline helper that is aware of the
underlying render loop and its timings. However, this option is off the
table because it will involve a lot of work to implement it.
Alternative and much simpler option is to pass the expected presentation
time to effects rather than time between consecutive frames. This means
that effects are responsible for determining how much animation timelines
have to be advanced. Typically, an effect would have to store the
presentation timestamp provided in either prePaint{Screen,Window} and
use it in the subsequent prePaint{Screen,Window} call to estimate the
amount of time passed between the next and the last frames.
Unfortunately, this is an API incompatible change. However, it shouldn't
take a lot of work to port third-party binary effects, which don't use the
AnimationEffect class, to the new API. On the bright side, we no longer
need to be concerned about the Compositor getting idle.
We do still try to determine whether the Compositor is about to idle,
primarily, because the OpenGL render backend swaps buffers on present,
but that will change with the ongoing compositing timing rework.
108 lines
2.6 KiB
C++
108 lines
2.6 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2009 Marco Martin notmart @gmail.com
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SPDX-FileCopyrightText: 2018 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef KWIN_SLIDINGPOPUPS_H
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#define KWIN_SLIDINGPOPUPS_H
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// Include with base class for effects.
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#include <kwineffects.h>
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namespace KWin
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{
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class SlidingPopupsEffect : public Effect
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{
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Q_OBJECT
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Q_PROPERTY(int slideInDuration READ slideInDuration)
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Q_PROPERTY(int slideOutDuration READ slideOutDuration)
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public:
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SlidingPopupsEffect();
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~SlidingPopupsEffect() override;
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void prePaintWindow(EffectWindow *w, WindowPrePaintData &data, std::chrono::milliseconds presentTime) override;
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void paintWindow(EffectWindow *w, int mask, QRegion region, WindowPaintData &data) override;
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void postPaintWindow(EffectWindow *w) override;
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void reconfigure(ReconfigureFlags flags) override;
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bool isActive() const override;
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int requestedEffectChainPosition() const override {
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return 40;
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}
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static bool supported();
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int slideInDuration() const;
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int slideOutDuration() const;
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bool eventFilter(QObject *watched, QEvent *event) override;
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private Q_SLOTS:
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void slotWindowAdded(EffectWindow *w);
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void slotWindowDeleted(EffectWindow *w);
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void slotPropertyNotify(EffectWindow *w, long atom);
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void slotWaylandSlideOnShowChanged(EffectWindow *w);
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void slideIn(EffectWindow *w);
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void slideOut(EffectWindow *w);
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void stopAnimations();
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private:
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void setupAnimData(EffectWindow *w);
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void setupInternalWindowSlide(EffectWindow *w);
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long m_atom;
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int m_slideLength;
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std::chrono::milliseconds m_slideInDuration;
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std::chrono::milliseconds m_slideOutDuration;
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enum class AnimationKind {
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In,
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Out
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};
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struct Animation {
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AnimationKind kind;
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TimeLine timeLine;
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std::chrono::milliseconds lastPresentTime = std::chrono::milliseconds::zero();
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};
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QHash<EffectWindow *, Animation> m_animations;
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enum class Location {
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Left,
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Top,
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Right,
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Bottom
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};
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struct AnimationData {
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int offset;
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Location location;
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std::chrono::milliseconds slideInDuration;
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std::chrono::milliseconds slideOutDuration;
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int slideLength;
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};
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QHash<const EffectWindow*, AnimationData> m_animationsData;
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};
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inline int SlidingPopupsEffect::slideInDuration() const
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{
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return m_slideInDuration.count();
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}
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inline int SlidingPopupsEffect::slideOutDuration() const
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{
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return m_slideOutDuration.count();
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}
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} // namespace
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#endif
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