From 45f447dafded5adfe11b7df3325c2d8f6ae0639b Mon Sep 17 00:00:00 2001 From: Peter Hutterer Date: Thu, 1 Oct 2009 21:19:11 +1000 Subject: dix: force a minimum of 0 for screen coordinates. 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 Acked-by: Simon Thum --- dix/getevents.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/dix/getevents.c b/dix/getevents.c index 5224d31eb..2df32e8f5 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 -- cgit v1.2.3