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0 pointskllrnohj3y ago0 comments

How much of that dolphin UI is hitting X drawing commands, which appears from your source link to be the simple case only, and how many are rendered to pixmaps and only composited by X?

All of the text, for example, is rendered by QT and sent as pixmaps. The drawTextItem path doesn't ever attempt to use XDrawText

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3 comments · 1 top-level

jcelerier3y ago· 2 in thread

What simple case ? Every call to drawRect/drawLine that I can see at a glance will end up inside X functions - e.g. calls to QPaintEngine::drawRects will just end up in the function below. And that's the huge majority of the UI.

Anyways, what matters to me is that I can resize the window without any lag and compression - it immediately becomes much more laggy and redraw-artefact-y if I disable X11 painting when I access my remote machines so it's pretty obvious when things are using it

tinus_hn3y ago

It’s the simple case of erasing the buffer before blitting other buffers onto it. I hope you agree that clearing is not the interesting part of drawing a window.

jcelerier3y ago

> It’s the simple case of erasing the buffer before blitting other buffers onto it.

... but those buffers are going to be paint with the same calls to drawRect. If I look at my software's draw calls, the huge majority are calls to such drawLine / drawRect / drawRects with the occasional small text or pixmap

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