1 files changed, 65 insertions, 0 deletions

diff --git a/include/grail-bits.h b/include/grail-bits.h
new file mode 100644
index 0000000..ca04c3f
--- /dev/null
+++ b/include/grail-bits.h
@@ -0,0 +1,65 @@
+/*****************************************************************************
+ *
+ * grail - Gesture Recognition And Instantiation Library
+ *
+ * Copyright (C) 2010 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *      Henrik Rydberg <rydberg@bitmath.org>
+ *
+ ****************************************************************************/
+
+#ifndef _GRAIL_BITS_H
+#define _GRAIL_BITS_H
+
+typedef unsigned char grail_mask_t;
+
+static inline void grail_mask_set(grail_mask_t *mask, int i)
+{
+        mask[i >> 3] |= (1 << (i & 7));
+}
+
+static inline void grail_mask_clear(grail_mask_t *mask, int i)
+{
+        mask[i >> 3] &= ~(1 << (i & 7));
+}
+
+static inline void grail_mask_modify(grail_mask_t *mask, int i, int v)
+{
+        if (v)
+                grail_mask_set(mask, i);
+        else
+                grail_mask_clear(mask, i);
+}
+
+static inline int grail_mask_get(const grail_mask_t *mask, int i)
+{
+        return (mask[i >> 3] >> (i & 7)) & 1;
+}
+
+void grail_mask_set_mask(grail_mask_t *a, const grail_mask_t *b, int bytes);
+void grail_mask_clear_mask(grail_mask_t *a, const grail_mask_t *b, int bytes);
+
+int grail_mask_count(const grail_mask_t *mask, int bytes);
+int grail_mask_get_first(const grail_mask_t *mask, int bytes);
+int grail_mask_get_next(int i, const grail_mask_t *mask, int bytes);
+
+#define grail_mask_foreach(i, mask, bytes)                              \
+        for (i = grail_mask_get_first(mask, bytes);                     \
+             i >= 0;                                                    \
+             i = grail_mask_get_next(i, mask, bytes))
+
+#endif