dri2: Don't page flip when the window size doesn't match the pixmap size
If the drawable size doesn't match the pixmap size page flipping should not be allowed. If the window is larger than the pixmap, page flipping might need to reposition the CRTC somewhere in the middle of the pixmap. I didn't spot any code that would handle that at least in the intel driver. Also the root pixmap could then move to some negative screen coordinates. Not sure if all bits of code could handle that. Perhaps when composite is enabled screen_x/y would make it work, but without composite there's no way that it would work AFAICS. Signed-off-by: Ville Syrjälä <ville.syrjala@nokia.com> Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
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@ -640,6 +640,17 @@ DRI2CanFlip(DrawablePtr pDraw)
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if (!RegionEqual(&pWin->clipList, &pRoot->winSize))
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return FALSE;
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/* Does the window match the pixmap exactly? */
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if (pDraw->x != 0 ||
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pDraw->y != 0 ||
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#ifdef COMPOSITE
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pDraw->x != pWinPixmap->screen_x ||
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pDraw->y != pWinPixmap->screen_y ||
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#endif
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pDraw->width != pWinPixmap->drawable.width ||
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pDraw->height != pWinPixmap->drawable.height)
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return FALSE;
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return TRUE;
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}
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