Add and test a simple kernel matcher

This matcher is for up to four fingers, and has these properties:

* Approximately 1.4 times faster at 4 fingers
* Approximately 4.0 times faster at 2 fingers
* Roughly 100 lines of code

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/match.h b/src/match.h
index 98e1fa5..efba6f5 100644
--- a/src/match.h
+++ b/src/match.h
@@ -40,4 +40,12 @@
 void mtdev_match(int index[DIM_FINGER], int A[DIM2_FINGER],
                  int nrow, int ncol);
 
+struct trk_coord {
+        int x;
+        int y;
+};
+
+const unsigned char *mtdev_match_four(const struct trk_coord *old, int nslot,
+                                      const struct trk_coord *pos, int npos);
+
 #endif