Yep. In a small window the image shows right. In medium windows there are 2 "zones". In a fullscreen window (1024x768) I can see 3 zones.
It's strange that nobody noticed it before.
I've been experimenting with this problem a bit and I'm pretty sure at this point it relates to something in the horizontal scaling portions of the savage Xv stuff. I found a simple program (http://www.xfree86.org/~mvojkovi/suzi.tar.gz, makes an executable called rotyuv) that repeatably demonstrates the issue and allows me to explore it a bit more.
Running it shows an image (redrawn constantly so it is a 'still' video) that you can stretch and resize and the program scales the image accordingly. You can stretch the image full screen vertically and no artifacts appear. However when you stretch it past 703 pixels wide on my machine it flips into the 2 zone mode.
The program uses XvShmPutImage to draw. I'm still trying to track down into the savage driver to see which method that ends up in when it gets down to the savage code. I think it is 'SavagePutImage' in the savage Xserver driver. (Alex could you point me in the right direction?)
If that turns out to be right, my next adventure is to figure out how to debug a running driver. Pointing gdb at my rotyuv process doesn't let me look down into the XvShmPutImage method. Suggestions are welcome.
Rob
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