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| author | Henrik Rydberg <rydberg@euromail.se> | 2010-04-11 01:25:50 +0200 |
|---|---|---|
| committer | Henrik Rydberg <rydberg@euromail.se> | 2010-04-15 06:10:07 +0200 |
| commit | 40b3cd568e8cc64a5f7f748f2003d90aa5e738ef (patch) | |
| tree | 69a4df96bd1e6b90b74a09335a69c985ee7ae0ce /src/capabilities.c | |
| parent | 030f4fdbe44d1af41c55cdda5baf71ba3225829f (diff) | |
| download | xorg-input-kobomultitouch-40b3cd568e8cc64a5f7f748f2003d90aa5e738ef.tar.gz xorg-input-kobomultitouch-40b3cd568e8cc64a5f7f748f2003d90aa5e738ef.tar.bz2 xorg-input-kobomultitouch-40b3cd568e8cc64a5f7f748f2003d90aa5e738ef.zip | |
Add robust position event filtering
The kernel filtering is bypassed for MT events. This patch reintroduces
filtering at the earliest possible point, right after the fingers have
been identified. For drivers that do not set proper fuzz parameters,
sensible values are derived based on a generic signal-to-noise ratio.
The defuzz code is borrowed from the Linux kernel, thanks GPL.
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Diffstat (limited to 'src/capabilities.c')
| -rw-r--r-- | src/capabilities.c | 9 |
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; } |