[PATCH] dix: force a minimum of 0 for screen coordinates.
Peter Hutterer
peter.hutterer at who-t.net
Thu Oct 1 17:21:39 PDT 2009
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.hutterer at who-t.net>
Acked-by: Simon Thum <simon.thum at 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
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