EXA

[Thomas Winischhofer]

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Eric Anholt wrote:
> On Wed, 2005-10-12 at 09:00 +0200, Lars Knoll wrote:
> 
>>On Wednesday 12 October 2005 06:32, Eric Anholt wrote:
>>
>>>On Wed, 2005-10-12 at 01:54 +0200, Thomas Winischhofer wrote:
>>>
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>>>>EXA is getting close to the point where it is entirely useless on
>>>>hardware that doesn't accelerate render/composite.
>>>>
>>>>On my (admittedly slow, 400Mhz) testbox, I can actually watch KDE paint
>>>>its default blue background.
>>>>
>>>>Adding some logging into the EXA hooks reveals that the driver receives
>>>>millions (yes, millions) of calls of copy commands with a width and
>>>>height of 1. Yes, 1. It fills the screen with 1x1 copy commands.
>>>
>>>Sounds like KDE is using a 1x1 pixmap for the window background, rather
>>>than setting a solid color.  Lame.  We'll just need to do something
>>>similar to what exaComposite does for 1x1 repeating pictures -- read out
>>>the one pixel and solid-fill it over the whole thing.
>>
>>No, it's not KDE. In many cases the only way to set do solid fills in Render 
>>is to setup a 1x1 pixmap with Repeat (at least it was up to 3 months ago). 
>>Xft uses exactly the same scheme, feel free to check XftDrawSrcPicture in 
>>xftdraw.c.
>>
>>Using 1x1 pictures with repeat has been a standard idiom in Render to do solid 
>>fills for years. The software code in fb/ has optimised code paths for this 
>>case. So should exa.
> 
> 
> I'm not talking about pictures here -- exaTryDriverSolidFill already
> covers solid fills with Render.  I'm talking about window background
> painting, which I added for pixmap backgrounds in hardware recently and
> caused the problem in question (as far as I can tell).


It's not only the window background. Also text in the KDE konsole is
updated in slow motion, speak 1x1 blits.


Thomas

- --
Thomas Winischhofer
Vienna/Austria
thomas AT winischhofer DOT net	       *** http://www.winischhofer.net

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