[Intel-gfx] XVideo size limit a problem when the screen is rotated

Simon Farnsworth simon.farnsworth at onelan.com
Tue Apr 28 14:34:20 CEST 2009

I've been attempting to tackle this myself, and hit a major snag:

I have tried changing the limits from 1920x1088 to 1088x1920, and had X
lock up on me. How do I find out where X is locked up?


Simon Farnsworth wrote:
> Hello,
> Barry Scott and I are hitting a limit with XVideo and rotated displays.
> For background, our screens are typically 1360x768 or 1920x1080.
> When we're in landscape mode, the XVideo limit of 1920x1088 is not a
> problem; the largest video we wish to play is 1920x1080.
> However, when we rotate the screen by 90 or 270 degrees (to get a
> portrait screen), we run into problems. The display is now 768x1360, or
> 1080x1920, but the XVideo limit remains at 1920x1088; this clips our
> video to either 768x1088, or 1080x1088.
> I've looked at i830_video.c, and noted the comment about the bigrequests
> limit, which implies we can't simply raise the XVideo size to 2000x2000
> and be done with it. I'm also not entirely clear on how I'd swap the two
> limits around when we rotate; 1088x1920 limit when at 90 or 270 degrees
> would suit us.
> How hard would it be to cope with an XvPutImage split across multiple
> requests? Does the server already combine the image for us, or would we
> need to do that? Failing that, how would we rearrange the limits to
> match the current screen rotation?
> We're using 945 and 965 chipsets, so need a solution that works for
> both, and our video player is using XShm to store the image.
Simon Farnsworth

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