From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.4+) Gecko/20010929 BuildID: 2001092908 For the past several milestone releases, I've had images corrupted, including images that are part of the browser skin. Forcing a redraw usually clears up the problem. This current build still exhibits the problem. I have a screen grab to demonstrate, if I can figure out how to attach images to bugs. The skin is usually only corrupted soon after the browser starts. Reproducible: Often (Win98; ATI Xpert98 AGP 2X; 128M RAM; Plenty of disk space)

I'm not sure what might be causing this ... Reporter, can you verify that you installed to a clean dir, and tried a new profile?? (Just running the checklist here...)

***spam*** This bug has been marked as a dependency of bug 104992, which is a tracking bug for a possible ATI videocard issue.

I just got back from vacation and installed Linux on the same machine, and the corruption doesn't show up on the Linux version of 0.9.4. The mozillas under Windows were in clean dirs, although I haven't tried removing the profile yet.

This bug report has the advantage of being very descriptive, and includes a nice attachment. I think we should confirm this bug as new, and set it as depending on bug 104992, the ATI graphics card bug. Right now it is blocking 104992, but we should switch that. I can confirm this bug on Win 98 with 2001112104. I have an ATI Rage Pro LT, running driver 4.11. I'm using DirectX 7.0 if it makes a difference.

Sheesh. Sorry. This time, really confirming. Ignore my earlier comments re: blocking and depending please. It's fine.

*** Bug 123266 has been marked as a duplicate of this bug. ***

I have a GeForce2MX btw; that's Nvidia, not ATI. Are we SURE my bug is a dupe of this one?

Ok, I un-duped the previously duped bug. I missed the fact this was YAAI (yet another ATI issue). You need to be more patient. I mid-aired with you. I could have just fixed this quietly but NO you HAD to humiliate me. :P

Undoing my changes.

This is a complete test case that "works" on Mozilla, Internet Explorer, Opera, and even WebTV belive it or not. Alpha blended png files. However on Mozilla the images become corrupted if the window size is too small or you scroll it. Resizing the window (forcing a redraw) corrects it.

Problem appears on Windows XP with ATI Rage 128 and TNT Vanta cards. Images are not rendered correctly if the page is scrolled, but will "fix" them selves if the window is resized or redrawn.

Here is a page of mine with a corrupt image: http://home.attbi.com/~ashitaka/panyo/ Scroll down (down button or down key) until you hit the W3C Certified button at the bottom. It loads the bottom half first. Would like a confirmation on this. The image loads correctly if I flip to it from another window or using PgDown. Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:0.9.9) Gecko/20020311

I am able to reproduce comment #14.

I have seen image corruption on web sites, too. Most recently on http://www.cygwin.com/ The title .jpg banner gets corrupted if I scroll down then back up. It is fixed, as comment 13 says, when a refresh is forced (resize/restore/etc). I do not see the problem in comment 14. I have an ATI card on W98. Upon a little testing, the Cygwin graphic problem only occurrs when the height of the jpg is scaled down to a size smaller than the original. The more it is scaled down, the more noticable the defects are. Maybe that's a clue, who knows?

This looks the same as bug 151081, but 151081 has a better summary. Could someone with permissions change this summary to mention resized image corruption?

This problem is very noticable (and reproducible) on this page showing a transit system map: http://www.octranspo.com/mapscheds/tripplanning/lansdowne_map.htm. Size your browser window so that only 3/4 of the width of the image is viewable and ~4/5 its height. Scrolling vertically has no impact, but scrolling hotizontally causes certain sections of the image to shift up or down, causing the map to be completely jumbled and unuseable. Tested with 1.1 beta, WinXP, GeForce2MX.

Here's some info I found which may help people with ATI cards on Win9x/ME (which is what this bug was originally filed about.) Okay, I stumbled across the WinGimp web page at http://www.gimp.org/~tml/gimp/win32/ and found that they too were having problems with ATI cards. I then did some more research and found that there are a few modifications one can make to their system.ini file (again, don't do this on Win2K or XP.) In the [display] section of c:\windows\system.ini, try adding various combinations of the following lines (and then rebooting): devbmp = 0 stretchengine = 0 stretchblt = 0 outengine = 0 These will disable various (possibly defective) portions of your video driver. This will, of course, slow down various games/graphics. The main one seems to be "devbmp". Try just that line first. If the problem is still there, try the adding the other lines. Don't forget to reboot for each change you make. Several of the sites I found on google said that ATI is aware of an issue with the Rage/RageII series cards/drivers, but I couldn't find anything on their website. If any of these modifications make any difference for anyone, please let us know. Oh yeah, and if any of this totally hoses your machine, it's not my (or mozilla.org's) fault :)

I tried those settings in various combinations, to no avail. The image corruption (and a crasher I found) stopped for when I put the Windows "Hardware acceleration" slider at the second notch from the left. Unfortunately, that also caused _much_ choppiness while scrolling. The settings in the [display] section of c:\windows\system.ini which that slider changed were: Mmio=0 SwCursor=1 On a better note, upgrading the video driver with the file wme-j5-30-1-b02.exe from ATI's website made the scrolling smooth again, even though the "Hardware acceleration" is still at the second notch from the left.

retargeting