[Bug 85921] Scrolling in LibreOffice Impress with enabled grid is very sluggish

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85921

--- Comment #4 from Michel Dänzer <michel at daenzer.net> ---
(In reply to Jan-Marek Glogowski from comment #0)
> EVERGREENCheckComposite: Component alpha not supported with source alpha and
> source value blending.

This is harmless. The driver doesn't support dual-source blending for sub-pixel
AA text, but EXA falls back to a two-pass acceleration method which is hardly
slower.


> In an other test I also saw some of the following lines, but these don't
> seem related:
> 
> EVERGREENCheckCompositeTexture: Unsupported picture format 0x1011000

Actually, I think this is the problem. There is no acceleration for 1bpp
bitmaps.

At one point, you mentioned on IRC that the problem seems less severe with
driver version 7.2 than with 7.3. Is that still the case, or was it just
because of different zoom factors? In the former case, it would be interesting
if you could bisect which change between 7.2 and 7.3 made it worse.

Other than that, I'm afraid there's very little chance that this will ever be
fixed with EXA. If glamor from current xserver Git master still shows the same
problem, please file a bug report against glamor, and hopefully someone will
implement acceleration for the affected paths in glamor at some point.

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