From 66e5de9eaefc33ffa6af3617f9ec7a50f10af50d Mon Sep 17 00:00:00 2001 From: Henrik Rydberg Date: Thu, 17 Jun 2010 18:12:58 +0200 Subject: Initial load of mtdev project Signed-off-by: Henrik Rydberg --- src/common.h | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 src/common.h (limited to 'src/common.h') 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 + * 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 +#include +#include +#include + +#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 -- cgit v1.2.3