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.
98 lines
2.7 KiB
C++
98 lines
2.7 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: 2006 Lubos Lunak <l.lunak@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef KWIN_SHOWFPS_H
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#define KWIN_SHOWFPS_H
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#include <QElapsedTimer>
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#include <QFont>
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#include <kwineffects.h>
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namespace KWin
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{
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class GLTexture;
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class ShowFpsEffect
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: public Effect
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{
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Q_OBJECT
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Q_PROPERTY(qreal alpha READ configuredAlpha)
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Q_PROPERTY(int x READ configuredX)
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Q_PROPERTY(int y READ configuredY)
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Q_PROPERTY(QRect fpsTextRect READ configuredFpsTextRect)
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Q_PROPERTY(int textAlign READ configuredTextAlign)
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Q_PROPERTY(QFont textFont READ configuredTextFont)
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Q_PROPERTY(QColor textColor READ configuredTextColor)
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public:
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ShowFpsEffect();
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void reconfigure(ReconfigureFlags) override;
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void prePaintScreen(ScreenPrePaintData& data, std::chrono::milliseconds presentTime) override;
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void paintScreen(int mask, const QRegion ®ion, ScreenPaintData& data) override;
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void paintWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data) override;
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void postPaintScreen() override;
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enum { INSIDE_GRAPH, NOWHERE, TOP_LEFT, TOP_RIGHT, BOTTOM_LEFT, BOTTOM_RIGHT }; // fps text position
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// for properties
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qreal configuredAlpha() const {
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return alpha;
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}
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int configuredX() const {
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return x;
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}
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int configuredY() const {
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return y;
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}
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QRect configuredFpsTextRect() const {
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return fpsTextRect;
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}
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int configuredTextAlign() const {
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return textAlign;
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}
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QFont configuredTextFont() const {
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return textFont;
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}
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QColor configuredTextColor() const {
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return textColor;
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}
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private:
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void paintGL(int fps, const QMatrix4x4 &projectionMatrix);
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#ifdef KWIN_HAVE_XRENDER_COMPOSITING
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void paintXrender(int fps);
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#endif
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void paintQPainter(int fps);
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void paintFPSGraph(int x, int y);
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void paintDrawSizeGraph(int x, int y);
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void paintGraph(int x, int y, QList<int> values, QList<int> lines, bool colorize);
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QImage fpsTextImage(int fps);
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QElapsedTimer t;
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enum { NUM_PAINTS = 100 }; // remember time needed to paint this many paints
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int paints[ NUM_PAINTS ]; // time needed to paint
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int paint_size[ NUM_PAINTS ]; // number of pixels painted
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int paints_pos; // position in the queue
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enum { MAX_FPS = 200 };
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qint64 frames[ MAX_FPS ]; // the time when the frame was done
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int frames_pos; // position in the queue
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double alpha;
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int x;
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int y;
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QRect fps_rect;
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QScopedPointer<GLTexture> fpsText;
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int textPosition;
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QFont textFont;
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QColor textColor;
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QRect fpsTextRect;
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int textAlign;
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QScopedPointer<EffectFrame> m_noBenchmark;
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};
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} // namespace
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#endif
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