On Tue, 13 Apr 2004, Mark Cuss wrote:
> Okay - I've done some digging and found the problem...
> To recap, our application decodes MPEG-2 video into a video window and draws
> overlays on top of the video. The problem was that the two seemed to
> "fight", causing the overlays to blink every time the video was refreshed
> (ie - 30 Hz or so)
> The following code is from the 4.4.0 X server source, i830_video.c, line
> 1416:
> /* update cliplist */
> /*
> * XXX Always draw the key. LinDVD seems to fill the window background
> * with a colour different from the key. This works around that.
> */
> if (1 || !REGION_EQUAL(pScreen, &pPriv->clip, clipBoxes)) {
> REGION_COPY(pScreen, &pPriv->clip, clipBoxes);
> xf86XVFillKeyHelper(pScreen, pPriv->colorKey, clipBoxes);
> }
> This code seems to be the offender... If I comment out the whole if block,
> things work as they should - the video is drawn into the YUV buffer, the
> overlays are drawn into the RGB buffer, and things blit together OK.
> I'm by no means a driver expert, but by the looks of the comments above this
> block of code, it looks like there was a bug in LinDVD that was worked
> around in the driver...
> Now - another somewhat related problem. When the MPEG-2 software is
> decoding and displaying video, at times video is drawn outside the video
> application in random blocks on the screen (ie - in terminal windows, on the
> desktop, etc.) This seems to happen whether the above mentioned block is
> commented out or not, so I don't think I introduced the bug.
> Does anyone have any suggestions?
How does commenting out the "1 || " part affect this problem?
Marc.
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| Marc Aurele La France | work: 1-780-492-9310 |
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XFree86 developer and VP. ATI driver and X server internals.
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