1 files changed, 9 insertions, 0 deletions

diff --git a/src/capabilities.c b/src/capabilities.c
index 7316f01..620ab60 100644
--- a/src/capabilities.c
+++ b/src/capabilities.c
@@ -26,6 +26,8 @@
 
 #define ADDCAP(s, c, x) strcat(s, c->has_##x ? " " #x : "")
 
+static const int SN_COORD = 250;        /* coordinate signal-to-noise ratio */
+
 static const int bits_per_long = 8 * sizeof(long);
 
 static inline int nlongs(int nbit)
@@ -78,6 +80,13 @@ int read_capabilities(struct Capabilities *cap, int fd)
 
         cap->has_mtdata = cap->has_position_x && cap->has_position_y;
 
+        cap->xfuzz = cap->abs_position_x.fuzz;
+        cap->yfuzz = cap->abs_position_y.fuzz;
+        if (cap->xfuzz <= 0 || cap->yfuzz <= 0) {
+                cap->xfuzz = get_cap_xsize(cap) / SN_COORD;
+                cap->yfuzz = get_cap_ysize(cap) / SN_COORD;
+        }
+
         return 0;
 }