Details
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Suggestion
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Resolution: Won't Do
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P2: Important
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None
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5.15.0 RC2
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None
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Linux/Wayland
Description
In Wayland environment, when qtqcuik uses qsgrenderinterface:: software to render, go to qwaylandshmbackingstore and submit the damage area to Wayland server through
void qwaylandwindow:: commit (qwaylandbuffer * buffer, const qregion & damage) mSurface->damage(rect.x(), rect.y(), rect.width(), rect.height()); void QWaylandWindow::damage(const QRect &rect) { mSurface->damage(rect.x(), rect.y(), rect.width(), rect.height()); }
In this way, Wayland synthesizer can realize window local region synthesis and improve performance.
However, when we use OpenGL to render for the back-end, we do not carry out the image tracking of the displayed, but the implementation of this part is missing in the code. For this, can we suggest that we also implement the image tracking in the Wayland plugin to render the back-end such as OpenGL and Vulkan. This is also of great benefit to improve the efficiency of the synthesizer.
The following is the data I track dirty. At this time, a rectangle is moving horizontally in the window. You can view the changes of the second row and the penultimate row, the x-axis offset.
qt.quick.dirty: QQuickWindowPrivate::updateDirtyNodes(): qt.quick.dirty: QSGNode: QQuickRectangle(0xace2b0, parent=0xac0810, geometry=49.8384,6 28x28) Position qt.scenegraph.renderloop: (RT) sceneGraphChanged qt.quick.dirty: QSGNode: QQuickRectangle(0xa67860, parent=0xa4be70, geometry=0,0 51.5101x6) Size qt.scenegraph.renderloop: (RT) - sync complete, waking Gui qt.scenegraph.renderloop: (RT) - rendering started qt.scenegraph.renderloop: - unlock after sync qt.scenegraph.renderloop: - advancing animations qt.scenegraph.renderloop: update from item QQuickWindowQmlImpl(0x88baf0 exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), title="Hello World", geometry=3098,174 640x480) qt.scenegraph.renderloop: update from item QQuickWindowQmlImpl(0x88baf0 exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), title="Hello World", geometry=3098,174 640x480) qt.scenegraph.renderloop: update from item QQuickWindowQmlImpl(0x88baf0 exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), title="Hello World", geometry=3098,174 640x480) qt.scenegraph.renderloop: update from item QQuickWindowQmlImpl(0x88baf0 exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), title="Hello World", geometry=3098,174 640x480) qt.scenegraph.renderloop: - animations done.. qt.scenegraph.time.renderloop: Frame prepared with 'threaded' renderloop, polish=0, lock=0, blockedForSync=11, animations=0 - (on Gui thread) QQuickWindowQmlImpl(0x88baf0 exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), title="Hello World", geometry=3098,174 640x480) qt.scenegraph.renderloop: - polish and sync update request qt.scenegraph.renderloop: polishAndSync (normal) QQuickWindowQmlImpl(0x88baf0 exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), title="Hello World", geometry=3098,174 640x480) qt.scenegraph.renderloop: - lock for sync qt.scenegraph.renderloop: - wait for sync qt.scenegraph.time.renderer: time in renderer: total=16ms, preprocess=0, updates=0, binding=0, rendering=16 qt.scenegraph.renderloop: (RT) - rendering done qt.scenegraph.time.renderloop: Frame rendered with 'threaded' renderloop in 16ms, sync=0, render=16, swap=0 - (on render thread) qt.scenegraph.renderloop: (RT) --- begin processEvents() qt.scenegraph.renderloop: (RT) WM_RequestSync qt.scenegraph.renderloop: (RT) --- done processEvents() qt.scenegraph.renderloop: (RT) syncAndRender() qt.scenegraph.renderloop: (RT) - updatePending, doing sync qt.scenegraph.renderloop: (RT) sync() qt.quick.dirty: QQuickWindowPrivate::updateDirtyNodes(): qt.quick.dirty: QSGNode: QQuickRectangle(0xace2b0, parent=0xac0810, geometry=50.4871,6 28x28) Position qt.scenegraph.renderloop: (RT) sceneGraphChanged
When oepngl and vullkan are back-end rendering, it is recommended to implement the damage tracking function in the platform abstraction.
Attachments
Issue Links
- relates to
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QTBUG-74928 Use damage requests to optimize QML compositor rendering
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- Reported
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