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.
231 lines
6.6 KiB
C++
231 lines
6.6 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: 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_SCENE_XRENDER_H
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#define KWIN_SCENE_XRENDER_H
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#include "scene.h"
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#include "shadow.h"
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#include "decorations/decorationrenderer.h"
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#ifdef KWIN_HAVE_XRENDER_COMPOSITING
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namespace KWin
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{
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class XRenderBackend;
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class SceneXrender
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: public Scene
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{
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Q_OBJECT
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public:
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class EffectFrame;
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~SceneXrender() override;
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bool initFailed() const override;
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CompositingType compositingType() const override {
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return XRenderCompositing;
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}
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void paint(int screenId, const QRegion &damage, const QList<Toplevel *> &windows,
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std::chrono::milliseconds presentTime) override;
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Scene::EffectFrame *createEffectFrame(EffectFrameImpl *frame) override;
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Shadow *createShadow(Toplevel *toplevel) override;
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void screenGeometryChanged(const QSize &size) override;
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xcb_render_picture_t xrenderBufferPicture() const override;
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OverlayWindow *overlayWindow() const override;
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bool usesOverlayWindow() const override;
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Decoration::Renderer *createDecorationRenderer(Decoration::DecoratedClientImpl *client) override;
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bool animationsSupported() const override {
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return true;
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}
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static SceneXrender *createScene(QObject *parent);
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protected:
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Scene::Window *createWindow(Toplevel *toplevel) override;
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void paintBackground(const QRegion ®ion) override;
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void paintGenericScreen(int mask, const ScreenPaintData &data) override;
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void paintDesktop(int desktop, int mask, const QRegion ®ion, ScreenPaintData &data) override;
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void paintCursor(const QRegion ®ion) override;
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void paintEffectQuickView(EffectQuickView *w) override;
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private:
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explicit SceneXrender(XRenderBackend *backend, QObject *parent = nullptr);
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static ScreenPaintData screen_paint;
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class Window;
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QScopedPointer<XRenderBackend> m_backend;
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};
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class SceneXrender::Window : public Scene::Window
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{
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Q_OBJECT
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public:
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Window(Toplevel* c, SceneXrender *scene);
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~Window() override;
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void performPaint(int mask, const QRegion ®ion, const WindowPaintData &data) override;
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QRegion transformedShape() const;
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void setTransformedShape(const QRegion& shape);
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static void cleanup();
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protected:
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WindowPixmap* createWindowPixmap() override;
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private:
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QRect mapToScreen(int mask, const WindowPaintData &data, const QRect &rect) const;
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QPoint mapToScreen(int mask, const WindowPaintData &data, const QPoint &point) const;
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QRect bufferToWindowRect(const QRect &rect) const;
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QRegion bufferToWindowRegion(const QRegion ®ion) const;
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void prepareTempPixmap();
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void setPictureFilter(xcb_render_picture_t pic, ImageFilterType filter);
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SceneXrender *m_scene;
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xcb_render_pictformat_t format;
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QRegion transformed_shape;
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static QRect temp_visibleRect;
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static XRenderPicture *s_tempPicture;
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static XRenderPicture *s_fadeAlphaPicture;
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};
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class XRenderWindowPixmap : public WindowPixmap
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{
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public:
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explicit XRenderWindowPixmap(Scene::Window *window, xcb_render_pictformat_t format);
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~XRenderWindowPixmap() override;
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xcb_render_picture_t picture() const;
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void create() override;
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private:
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xcb_render_picture_t m_picture;
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xcb_render_pictformat_t m_format;
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};
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class SceneXrender::EffectFrame
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: public Scene::EffectFrame
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{
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public:
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EffectFrame(EffectFrameImpl* frame);
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~EffectFrame() override;
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void free() override;
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void freeIconFrame() override;
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void freeTextFrame() override;
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void freeSelection() override;
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void crossFadeIcon() override;
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void crossFadeText() override;
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void render(const QRegion ®ion, double opacity, double frameOpacity) override;
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static void cleanup();
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private:
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void updatePicture();
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void updateTextPicture();
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void renderUnstyled(xcb_render_picture_t pict, const QRect &rect, qreal opacity);
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XRenderPicture* m_picture;
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XRenderPicture* m_textPicture;
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XRenderPicture* m_iconPicture;
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XRenderPicture* m_selectionPicture;
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static XRenderPicture* s_effectFrameCircle;
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};
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inline
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QRegion SceneXrender::Window::transformedShape() const
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{
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return transformed_shape;
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}
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inline
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void SceneXrender::Window::setTransformedShape(const QRegion& shape)
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{
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transformed_shape = shape;
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}
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inline
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xcb_render_picture_t XRenderWindowPixmap::picture() const
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{
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return m_picture;
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}
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/**
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* @short XRender implementation of Shadow.
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*
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* This class extends Shadow by the elements required for XRender rendering.
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* @author Jacopo De Simoi <wilderkde@gmail.org>
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*/
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class SceneXRenderShadow
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: public Shadow
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{
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public:
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explicit SceneXRenderShadow(Toplevel *toplevel);
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using Shadow::ShadowElements;
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using Shadow::ShadowElementTop;
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using Shadow::ShadowElementTopRight;
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using Shadow::ShadowElementRight;
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using Shadow::ShadowElementBottomRight;
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using Shadow::ShadowElementBottom;
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using Shadow::ShadowElementBottomLeft;
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using Shadow::ShadowElementLeft;
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using Shadow::ShadowElementTopLeft;
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using Shadow::ShadowElementsCount;
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using Shadow::shadowPixmap;
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~SceneXRenderShadow() override;
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void layoutShadowRects(QRect& top, QRect& topRight,
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QRect& right, QRect& bottomRight,
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QRect& bottom, QRect& bottomLeft,
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QRect& Left, QRect& topLeft);
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xcb_render_picture_t picture(ShadowElements element) const;
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protected:
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void buildQuads() override;
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bool prepareBackend() override;
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private:
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XRenderPicture* m_pictures[ShadowElementsCount];
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};
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class SceneXRenderDecorationRenderer : public Decoration::Renderer
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{
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Q_OBJECT
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public:
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enum class DecorationPart : int {
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Left,
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Top,
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Right,
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Bottom,
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Count
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};
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explicit SceneXRenderDecorationRenderer(Decoration::DecoratedClientImpl *client);
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~SceneXRenderDecorationRenderer() override;
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void render() override;
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void reparent(Deleted *deleted) override;
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xcb_render_picture_t picture(DecorationPart part) const;
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private:
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void resizePixmaps();
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QSize m_sizes[int(DecorationPart::Count)];
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xcb_pixmap_t m_pixmaps[int(DecorationPart::Count)];
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xcb_gcontext_t m_gc;
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XRenderPicture* m_pictures[int(DecorationPart::Count)];
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};
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class KWIN_EXPORT XRenderFactory : public SceneFactory
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{
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Q_OBJECT
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Q_INTERFACES(KWin::SceneFactory)
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Q_PLUGIN_METADATA(IID "org.kde.kwin.Scene" FILE "xrender.json")
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public:
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explicit XRenderFactory(QObject *parent = nullptr);
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~XRenderFactory() override;
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Scene *create(QObject *parent = nullptr) const override;
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};
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} // namespace
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#endif
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#endif
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