Initial load of mtdev project

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

1 files changed, 87 insertions, 0 deletions

diff --git a/src/common.h b/src/common.h
new file mode 100644
index 0000000..03bc7bd
--- /dev/null
+++ b/src/common.h
@@ -0,0 +1,87 @@
+/*****************************************************************************
+ *
+ * mtdev - MT device event converter (MIT license)
+ *
+ * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
+ * Copyright (C) 2010 Canonical Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ ****************************************************************************/
+
+#ifndef COMMON_H
+#define COMMON_H
+
+#include <mtdev-mapping.h>
+#include <malloc.h>
+#include <string.h>
+#include <errno.h>
+
+#define DIM_FINGER 32
+#define DIM2_FINGER (DIM_FINGER * DIM_FINGER)
+
+/* event buffer size (must be a power of two) */
+#define DIM_EVENTS 512
+
+/* all bit masks have this type */
+typedef unsigned int bitmask_t;
+
+#define BITMASK(x) (1U << (x))
+#define BITONES(x) (BITMASK(x) - 1U)
+#define GETBIT(m, x) (((m) >> (x)) & 1U)
+#define SETBIT(m, x) (m |= BITMASK(x))
+#define CLEARBIT(m, x) (m &= ~BITMASK(x))
+#define MODBIT(m, x, b) ((b) ? SETBIT(m, x) : CLEARBIT(m, x))
+
+static inline int maxval(int x, int y) { return x > y ? x : y; }
+static inline int minval(int x, int y) { return x < y ? x : y; }
+
+static inline int clamp15(int x)
+{
+        return x < -32767 ? -32767 : x > 32767 ? 32767 : x;
+}
+
+/* absolute scale is assumed to fit in 15 bits */
+static inline int dist2(int dx, int dy)
+{
+        dx = clamp15(dx);
+        dy = clamp15(dy);
+        return dx * dx + dy * dy;
+}
+
+/* Count number of bits (Sean Eron Andersson's Bit Hacks) */
+static inline int bitcount(unsigned v)
+{
+        v -= ((v>>1) & 0x55555555);
+        v = (v&0x33333333) + ((v>>2) & 0x33333333);
+        return (((v + (v>>4)) & 0xF0F0F0F) * 0x1010101) >> 24;
+}
+
+/* Return index of first bit [0-31], -1 on zero */
+#define firstbit(v) (__builtin_ffs(v) - 1)
+
+/* boost-style foreach bit */
+#define foreach_bit(i, m)                                               \
+        for (i = firstbit(m); i >= 0; i = firstbit((m) & (~0U << i + 1)))
+
+/* robust system ioctl calls */
+#define SYSCALL(call) while (((call) == -1) && (errno == EINTR))
+
+#endif