Bug 19856

Summary:

xvideo: broken bilinear filter for the red color component

Product:

xorg

Reporter:

Brice Goglin <brice.goglin>

Component:

Driver/intel

Assignee:

Wang Zhenyu <zhenyu.z.wang>

Status:

RESOLVED FIXED

QA Contact:

Xorg Project Team <xorg-team>

Severity:

normal

Priority:

medium

CC:

skyrat

Version:

git

Keywords:

regression

Hardware:

Other

OS:

All

URL:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=513427

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
visible problem with filtering of red color component	none
xvideo output - more visible problem	none

Description Brice Goglin 2009-01-31 03:43:49 UTC

SkyRaT <skyrat@email.cz> reported this bug in the Debian BTS recently.
He's running Xserver 1.5.99.901 with Intel 2.6.1 on 2.6.26-1-amd64 on
a "Integrated Graphics Chipset: Intel(R) G45/G43".

He says:
"This issue arose after the latest upgrade and was not present before.
One can clearly see, when there is a red object in a playing video,
and has the window enlarged or placed on the full screen, the red
object is being "pixelized" instead of blurred by the bilinear
filter as other colors. For sure, the red component is in almost
every color, so the whole screen is being influenced, but it is not
so apparent."

Config and Log available at
http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;bug=513427

Comment 1 Gordon Jin 2009-01-31 04:16:57 UTC

What's the working version of xserver and xf86-video-intel?

Comment 2 Rene Pavlik 2009-02-01 13:47:51 UTC

Created attachment 22443 [details]
visible problem with filtering of red color component

Comment 3 Rene Pavlik 2009-02-06 10:26:37 UTC

Created attachment 22656 [details]
xvideo output - more visible problem

the previous screenshot was made using the "-vo gl" option to mplayer.
The current one was made using "-vo xv"

Comment 4 Brice Goglin 2009-02-08 12:53:32 UTC

Rene isn't sure which version was working fine before this regression appeared. 2.5.99 was probably fine.

Comment 5 William 2009-04-18 02:32:01 UTC

I've had this problem ever since I started using this driver (about version 2.2.0). The overlay video has always worked much better for me (no tearing / red-pixelation).

Comment 6 Eric Anholt 2009-08-05 15:12:07 UTC

commit 79b6851148574419389ac8055b0c31b8bdac3ab3
Author: Eric Anholt <eric@anholt.net>
Date:   Wed Aug 5 12:45:16 2009 -0700

    Fix sampler indexes on i965 planar video.
    
    We only set up one sampler, because all of our sampling is the same.  By
    using a non-zero index for the other two samplers, we'd dereference (likely)
    zeroed data, resulting in using NEAREST filtering.  This was a regression in
    40671132cb3732728703c6444f4577467fa9223f which incidentally switched from
    having 6 samplers to 1.
    
    Bug #22895, #19856

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