QPainter性能高帧速率 [英] QPainter performance high frame rate

问题描述

我想在一个QPainter（在OpenGLwidget）中以60fps显示视频

I am trying to show video at 60fps in a QPainter (in an OpenGLwidget)

我有一个问题，有时绘图需要太长的时间，

I am having an issue that sometimes the drawing takes too long and the next repaint event happens while QPainter is in use - which generates a warning and random crashes.

有几个问题：

有一个'Qt方式'，它会产生一个警告和随机崩溃。有效地互斥调用重绘，因为大概QPainter知道它正在使用 - 或者我只是使用我的平台mutex支持？

A couple of questions:
Is there a 'Qt way' to efficently interlock calls to repaint, since presumably QPainter knows it is being used - or do I just use my platforms mutex support?

有更好的方法来画高帧速率（当然还需要锁定到VSync）而不仅仅是一个定时器调用repaint（）？

Is there a better way to draw at high frame rates (which of course also needs to be locked to VSync) than just a timer calling repaint()?

推荐答案

尝试使用 update（），而不是 repaint（）。

此函数不会导致
立即重绘;而是
调度paint事件来处理
当Qt返回主事件
循环。这允许Qt优化
更多的速度和更少的闪烁比
调用repaint（）。

This function does not cause an immediate repaint; instead it schedules a paint event for processing when Qt returns to the main event loop. This permits Qt to optimize for more speed and less flicker than a call to repaint() does.

调用update（）几次
通常只会产生一个
paintEvent（）调用。

Calling update() several times normally results in just one paintEvent() call.

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