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Diffstat (limited to 'src/common.h')
| -rw-r--r-- | src/common.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/src/common.h b/src/common.h new file mode 100644 index 0000000..2ec8eb8 --- /dev/null +++ b/src/common.h @@ -0,0 +1,147 @@ +/***************************************************************************** + * + * mtdev - Multitouch Protocol Translation Library (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 + +#define MTDEV_NO_LEGACY_API + +#include <mtdev-mapping.h> +#include <mtdev-plumbing.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)) + +/** + * struct mtdev - represents an input MT device + * @has_mtdata: true if the device has MT capabilities + * @has_slot: true if the device sends MT slots + * @slot: slot event properties + * @abs: ABS_MT event properties + * @state: internal mtdev parsing state + * + * The mtdev structure represents a kernel MT device type B, emitting + * MT slot events. The events put into mtdev may be from any MT + * device, specifically type A without contact tracking, type A with + * contact tracking, or type B with contact tracking. See the kernel + * documentation for further details. + * + */ +struct mtdev { + int has_mtdata; + int has_slot; + int has_abs[11]; + struct input_absinfo slot; + struct input_absinfo abs[11]; + struct mtdev_state *state; +}; + +#define MT_ABS_SIZE 12 + +static const unsigned int mtdev_map_abs2mt[ABS_CNT] = { + 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, + 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, + 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, + 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, + 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, + 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, + 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, + 0x0009, 0x000a, 0x000b, 0x000c, 0x0000, 0x0000, 0x0000, 0x0000, +}; + +static const unsigned int mtdev_map_mt2abs[MT_ABS_SIZE] = { + 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, + 0x0038, 0x0039, 0x003a, 0x003b, +}; + +static inline int mtdev_is_absmt(unsigned int code) +{ + return mtdev_map_abs2mt[code]; +} + +static inline unsigned int mtdev_abs2mt(unsigned int code) +{ + return mtdev_map_abs2mt[code] - 1; +} + +static inline unsigned int mtdev_mt2abs(unsigned int mtcode) +{ + return mtdev_map_mt2abs[mtcode]; +} + +#endif |