| /*************************************************************************** |
| * |
| * Multitouch X driver |
| * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se> |
| * |
| * 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 2 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, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| **************************************************************************/ |
| |
| #include "memory.h" |
| |
| #define use_tapping 1 |
| |
| /* click area definition */ |
| #define CLICK_AREA(c) ((c->has_ibt ? 0.20 : 0.00) * get_cap_ysize(c)) |
| |
| /* fraction of max movement threshold */ |
| #define DELTA_CUT(x) (0.5 * (x)) |
| |
| /* fraction of tap movement threshold */ |
| #define TAP_XMOVE(c) (0.05 * get_cap_xsize(c)) |
| #define TAP_YMOVE(c) (0.05 * get_cap_ysize(c)) |
| |
| /* timer for cursor stability on finger touch/release */ |
| static const int FINGER_ATTACK_MS = 40; |
| static const int FINGER_DECAY_MS = 120; |
| static const int FINGER_CORNER_MS = 300; |
| |
| /* tapping timings */ |
| static const int TAP_SETTLE_MS = 400; |
| static const int TAP_TOUCH_MS = 120; |
| static const int TAP_GAP_MS = 200; |
| |
| static inline int dxval(const struct FingerState *a, |
| const struct FingerState *b) |
| { |
| return a->position_x - b->position_x; |
| } |
| static inline int dyval(const struct FingerState *a, |
| const struct FingerState *b) |
| { |
| return a->position_y - b->position_y; |
| } |
| |
| static inline void relax_tapping(struct Memory *m, const struct MTState *state) |
| { |
| m->tprelax = state->evtime + TAP_SETTLE_MS; |
| m->wait = 0; |
| m->ntap = 0; |
| } |
| |
| static inline int unrelated_taps(const struct Memory *m, |
| const struct Capabilities *caps) |
| { |
| return abs(m->xdown - m->xup) > TAP_XMOVE(caps) || |
| abs(m->ydown - m->yup) > TAP_YMOVE(caps); |
| } |
| |
| /** |
| * init_memory |
| */ |
| void init_memory(struct Memory *mem) |
| { |
| memset(mem, 0, sizeof(struct Memory)); |
| } |
| |
| /** |
| * update_configuration |
| * |
| * Update the same, fingers, added, and thumb memory variables. |
| * |
| * Precondition: none |
| * |
| * Postcondition: same, fingers, added, thumb are set |
| * |
| */ |
| static void update_configuration(struct Memory *m, |
| const struct MTState *prev_state, |
| const struct MTState *state) |
| { |
| const struct FingerState *f = state->finger; |
| bitmask_t fingers = BITONES(state->nfinger); |
| int i; |
| m->added = 0; |
| foreach_bit(i, fingers) |
| if (!find_finger(prev_state, f[i].tracking_id)) |
| SETBIT(m->added, i); |
| m->same = m->fingers == fingers && m->added == 0; |
| m->fingers = fingers; |
| if (!m->same) |
| m->thumb = 0; |
| m->thumb |= state->thumb; |
| } |
| |
| /** |
| * update_pointers |
| * |
| * Update the pointing and ybar memory variables. |
| * |
| * Precondition: fingers, added, thumb are set |
| * |
| * Postcondition: pointing, ybar are set |
| * |
| */ |
| static void update_pointers(struct Memory *m, |
| const struct MTState *state, |
| const struct Capabilities *caps) |
| { |
| const struct FingerState *f = state->finger; |
| int yclick = caps->abs[MTDEV_POSITION_Y].maximum - CLICK_AREA(caps); |
| |
| int i; |
| |
| if (state->nfinger < 2) { |
| m->pointing = m->fingers; |
| m->ybar = caps->abs[MTDEV_POSITION_Y].maximum; |
| return; |
| } |
| |
| if (m->same) { |
| foreach_bit(i, m->fingers & ~m->pointing) { |
| if (f[i].position_y <= m->ybar) { |
| m->pointing = m->fingers; |
| return; |
| } |
| } |
| return; |
| } |
| |
| m->pointing = 0; |
| m->ybar = yclick; |
| foreach_bit(i, m->fingers) { |
| if (f[i].position_y > yclick) |
| continue; |
| if (!m->pointing || f[i].position_y > m->ybar) |
| m->ybar = f[i].position_y; |
| SETBIT(m->pointing, i); |
| } |
| |
| } |
| |
| /** |
| * update_movement |
| * |
| * Update the pending, moving, mvhold, mvforget, dx and dy memory variables. |
| * |
| * When moving is nonzero, gestures can be extracted from the dx and dy |
| * variables. These variables should be cleared after use. |
| * |
| * Precondition: fingers, added, thumb, pointing are set |
| * |
| * Postcondition: pending, moving, mvhold, mvforget, dx, dy are set |
| * |
| */ |
| static void update_movement(struct Memory *m, |
| const struct MTState *prev_state, |
| const struct MTState *state, |
| const struct Capabilities *caps) |
| { |
| const struct FingerState *prev, *f = state->finger; |
| int i, xcut, ycut, xmax = 0, ymax = 0; |
| |
| m->moving = 0; |
| m->pending = 0; |
| |
| if (!m->same) { |
| mstime_t d2, d2max = center_maxdist2(caps); |
| mem_hold_movement(m, state->evtime + FINGER_ATTACK_MS); |
| if (!m->added) |
| mem_hold_movement(m, state->evtime + FINGER_DECAY_MS); |
| foreach_bit(i, m->added) { |
| d2 = center_dist2(&f[i], caps); |
| d2 *= FINGER_CORNER_MS - FINGER_ATTACK_MS; |
| d2 /= d2max; |
| m->mvhold += d2; |
| } |
| memset(m->dx, 0, sizeof(m->dx)); |
| memset(m->dy, 0, sizeof(m->dy)); |
| return; |
| } |
| |
| if (state->evtime < m->mvforget) |
| return; |
| |
| foreach_bit(i, m->pointing) { |
| int dx, dy; |
| prev = find_finger(prev_state, f[i].tracking_id); |
| dx = dxval(&f[i], prev); |
| dy = dyval(&f[i], prev); |
| m->dx[i] += dx; |
| m->dy[i] += dy; |
| xmax = maxval(xmax, abs(m->dx[i])); |
| ymax = maxval(ymax, abs(m->dy[i])); |
| } |
| xcut = DELTA_CUT(xmax); |
| ycut = DELTA_CUT(ymax); |
| foreach_bit(i, m->pointing) |
| if (abs(m->dx[i]) > xcut || abs(m->dy[i]) > ycut) |
| SETBIT(m->pending, i); |
| |
| if (state->evtime < m->mvhold) |
| return; |
| |
| m->moving = m->pending; |
| } |
| |
| /** |
| * update_tapping |
| * |
| * Update tpdown, tpup, tprelax, wait, maxtap, ntap. |
| * |
| * Precondition: pointing and thumb are set |
| * |
| * Postcondition: tpdown, tpup, tprelax, wait, maxtap, ntap set |
| * |
| */ |
| static void update_tapping(struct Memory *m, |
| const struct MTState *prev_state, |
| const struct MTState *state, |
| const struct Capabilities *caps) |
| { |
| int x, y, i, npoint = bitcount(m->pointing); |
| |
| /* use a position independent on the number of fingers */ |
| if (state->nfinger) { |
| x = state->finger[0].position_x; |
| y = state->finger[0].position_y; |
| for (i = 1; i < state->nfinger; i++) { |
| x = minval(x, state->finger[i].position_x); |
| y = minval(y, state->finger[i].position_y); |
| } |
| } |
| |
| if (m->thumb || state->evtime < m->mvforget) { |
| relax_tapping(m, state); |
| } else if (state->nfinger && !prev_state->nfinger) { |
| m->tpdown = state->evtime; |
| m->xdown = x; |
| m->ydown = y; |
| m->wait = 0; |
| m->maxtap = npoint; |
| if (m->tpdown > m->tpup + TAP_GAP_MS) |
| m->ntap = 0; |
| else if (unrelated_taps(m, caps)) |
| relax_tapping(m, state); |
| m->xup = x; |
| m->yup = y; |
| } else if (!state->nfinger && prev_state->nfinger) { |
| m->tpup = state->evtime; |
| if (m->tpup > m->tprelax && |
| m->tpup <= m->tpdown + TAP_TOUCH_MS) { |
| m->wait = TAP_GAP_MS; |
| m->ntap++; |
| if (unrelated_taps(m, caps)) |
| relax_tapping(m, state); |
| } |
| } else if (state->nfinger) { |
| m->xup = minval(m->xup, x); |
| m->yup = minval(m->yup, y); |
| m->maxtap = maxval(m->maxtap, npoint); |
| } |
| } |
| |
| void refresh_memory(struct Memory *m, |
| const struct MTState *prev_state, |
| const struct MTState *state, |
| const struct Capabilities *caps) |
| { |
| update_configuration(m, prev_state, state); |
| update_pointers(m, state, caps); |
| update_movement(m, prev_state, state, caps); |
| if (use_tapping || !caps->has_left) |
| update_tapping(m, prev_state, state, caps); |
| } |
| |
| void output_memory(const struct Memory *m) |
| { |
| int i; |
| xf86Msg(X_INFO, "btdata: %04x\n", m->btdata); |
| xf86Msg(X_INFO, "fingers: %04x\n", m->fingers); |
| xf86Msg(X_INFO, "added: %04x\n", m->added); |
| xf86Msg(X_INFO, "pointing: %04x\n", m->pointing); |
| xf86Msg(X_INFO, "pending: %04x\n", m->pending); |
| xf86Msg(X_INFO, "moving: %04x\n", m->moving); |
| xf86Msg(X_INFO, "ybar: %d\n", m->ybar); |
| } |