Nouveau - Jul 2014 - [Bug 81283] New: Icons are misrendered when rgb font hinting is activated [NV18]

https://bugs.freedesktop.org/show_bug.cgi?id=81283

          Priority: medium
            Bug ID: 81283
          Assignee: nouveau at lists.freedesktop.org
           Summary: Icons are misrendered when rgb font hinting is
                    activated [NV18]
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: linuxhippy at gmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 102687
  --> https://bugs.freedesktop.org/attachment.cgi?id=102687&action=edit
xorg.log

When selecting RGB subpixel font antialising on my mothers laptop (Geforce
488Go / NV18) icons are suddenly misrendered (see screenshot)

Tried several options such as NoUploadTo/DowloadFromScreen, MigrationHeuristics
smart/greedy, agpmode=0 - however only disabling render acceleration completely
did help.

The notebook is running Fedora-20 + latest updates (linux-3.15.4), the issue
happends with nouveau 1.0.9 as well as nouveau git from 20140713.

- Clemens

PS: It is incredible how well nouveau performs for 2D operations these days,
thanks for working on improving this area over the past years.

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--- Comment #1 from Clemens Eisserer <linuxhippy at gmail.com> ---
Created attachment 102688
  --> https://bugs.freedesktop.org/attachment.cgi?id=102688&action=edit
screenshot of icons rendered white

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
There have been a few reports of things not being drawn on NV1x, but no one
ever narrowed it down to anything, and I could never reproduce.

I wonder if some sort of alpha setting isn't actually supported and so
things
are being drawn with alpha=0 or something. If you're a developer, can you
debug
this a bit? Take a look at src/nv10_exa.c (in the ddx)... the function that
determines if something will be accelerated is NV10EXACheckComposite. Start by
just returning FALSE unconditionally there and make sure the problem is
'fixed'. (If it isn't, the issue is something else.)

Assuming it's fine, try printing the requests that are making it through and
try to identify the ones that aren't being handled properly (by selectively
returning false for some of them).

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--- Comment #3 from Clemens Eisserer <linuxhippy at gmail.com>
---
>  If you're a developer, can you debug this a bit?
Unfourtunately I am not a driver developer, however I can play a bit arround
and see how things change.
> There have been a few reports of things not being drawn on NV1x,
Interesting you mention missing things, because when I go with grayscale
antialising I can see missing text on the desktop icons. I didn't mention
it,
because I guess it is really hard to reproduce.
> I wonder if some sort of alpha setting isn't actually supported 
> and so things are being drawn with alpha=0 or something.
However, shouldn't this just affect the glyphs rendered? The blending mode
of
the icons doesn't change, so it seems some state is garbled after the glyphs
were rendered, leading to those misrendered icons.

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I just sent a bunch of patches to the list... two of the patches are no-ops,
but these two actually change functionality:

http://lists.freedesktop.org/archives/nouveau/2014-August/018270.html
http://lists.freedesktop.org/archives/nouveau/2014-August/018271.html

please see if applying these fixes the issue for you.

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--- Comment #5 from Clemens Eisserer <linuxhippy at gmail.com> ---
The two patches fix both issues - the icon corruption when RGB font hinting is
activated, as well as somtimes missing text with greyscale antialiasing :)

This makes my old laptop a fully functional email/browsing machine again -
thanks!

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Awesome! These patches should be in xf86-video-nouveau git now. A release is
going to be forthcoming once a couple of issues are ironed out.

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