All of lore.kernel.org
 help / color / mirror / Atom feed
* [Bug 32855] New: Incorrect image stretching with Render in RepeatPad mode, NV50
@ 2011-01-05 19:55 bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
       [not found] ` <bug-32855-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>
  0 siblings, 1 reply; 12+ messages in thread
From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ @ 2011-01-05 19:55 UTC (permalink / raw)
  To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW

https://bugs.freedesktop.org/show_bug.cgi?id=32855

           Summary: Incorrect image stretching with Render in RepeatPad
                    mode, NV50
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
        ReportedBy: zackw-VmQCmMdMyN0AvxtiuMwx3w@public.gmane.org
         QAContact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org


Created an attachment (id=41683)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41683)
test program

Attached is a test program which attempts to stretch a two-pixel image
horizontally using Cairo.  It generates four files: r-image-24.png should be
pixel-identical to r-xlib-24.png and r-image-32.png should be pixel-identical
to r-xlib-32.png.

On my system (I don't remember the exact marketing name of the card, but the
driver identifies it as "NVIDIA NV94" and as "a NV50 generation card"), even
with the very latest version of the Nouveau driver (xf86-video-nouveau git
dc89dac734167bcbc667b39ca6ee2043871a60bf), the -xlib- files are not identical
to their respective -image- files.  (I will also attach the test results as
produced by my system.)

With the 24bpp image, the problem appears to be simply that Cairo's EXTEND_PAD
(Render's RepeatPad) is not doing its job, despite that I do see code in the
driver to implement that mode.  The upscale is happening as if there were black
pixels around the edges of the single-pixel source image, instead of green and
white pixels as EXTEND_PAD specifies.

With the 32bpp image, in addition to that problem, there are also garbage
pixels at intervals.

I am happy to provide more information as necessary and/or to test patches.

-- 
Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.

^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2013-08-26 19:04 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-01-05 19:55 [Bug 32855] New: Incorrect image stretching with Render in RepeatPad mode, NV50 bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
     [not found] ` <bug-32855-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>
2011-01-05 19:55   ` [Bug 32855] " bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2011-01-05 19:55   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2011-01-05 19:56   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2011-01-05 19:56   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2011-01-05 19:56   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2011-01-05 19:57   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2011-01-05 20:00   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2013-08-18 18:10   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2013-08-26 18:35   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2013-08-26 18:59   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2013-08-26 19:04   ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.