Currently the root coordinates may fall into ]-1..0] if the subpixel remainder is less than 0. Screen coordinates mustn't go below 0, so use miPointerSetPosition to cap off the remainder if the coordinates are below 0.
This is cheating a bit, a more comprehensive solution to deal with subpixels correctly when crossing screens is needed. For now, this'll do. Signed-off-by: Peter Hutterer <peter.hutte...@who-t.net> Acked-by: Simon Thum <simon.t...@gmx.de> --- dix/getevents.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/dix/getevents.c b/dix/getevents.c index 5224d31..2df32e8 100644 --- a/dix/getevents.c +++ b/dix/getevents.c @@ -781,6 +781,19 @@ positionSprite(DeviceIntPtr dev, int *x, int *y, float x_frac, float y_frac, *screeny_frac = dev->last.remainder[1]; } + /* Hit the left screen edge? */ + if (*screenx <= 0 && *screenx_frac < 0.0f) + { + *screenx_frac = 0.0f; + x_frac = 0.0f; + } + if (*screeny <= 0 && *screeny_frac < 0.0f) + { + *screeny_frac = 0.0f; + y_frac = 0.0f; + } + + old_screenx = *screenx; old_screeny = *screeny; /* This takes care of crossing screens for us, as well as clipping -- 1.6.3.rc1.2.g0164.dirty _______________________________________________ xorg-devel mailing list xorg-devel@lists.x.org http://lists.x.org/mailman/listinfo/xorg-devel