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Implement double tap emulation for SDK use
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After enabling the feature with:
  mcetool --set-fake-doubletap=enabled

The SDK emulator window can be unblanked by double clicking
within it with mouse.

[sdk] Support display unblanking via double click with mouse
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@spiiroin
spiiroin committed May 24, 2013
1 parent 93a1ef8 commit 2435997
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Showing 6 changed files with 336 additions and 6 deletions.
4 changes: 4 additions & 0 deletions .depend
View file
Expand Up @@ -36,6 +36,7 @@ event-input.o:\
evdev.h\
event-input.h\
mce-conf.h\
mce-gconf.h\
mce-io.h\
mce-lib.h\
mce-log.h\
Expand All @@ -47,6 +48,7 @@ event-input.pic.o:\
evdev.h\
event-input.h\
mce-conf.h\
mce-gconf.h\
mce-io.h\
mce-lib.h\
mce-log.h\
Expand Down Expand Up @@ -690,13 +692,15 @@ tools/evdev_trace.pic.o:\

tools/mcetool.o:\
tools/mcetool.c\
event-input.h\
modules/display.h\
modules/filter-brightness-als.h\
modules/powersavemode.h\
tklock.h\

tools/mcetool.pic.o:\
tools/mcetool.c\
event-input.h\
modules/display.h\
modules/filter-brightness-als.h\
modules/powersavemode.h\
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7 changes: 7 additions & 0 deletions Makefile
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Expand Up @@ -94,6 +94,9 @@ ENABLE_RFS_CUD_SUPPORT ?= n
# Whether to enable backup/restore support
ENABLE_BACKUP_SUPPORT ?= n

# Whether to enable double-click == double-tap emulation
ENABLE_DOUBLETAP_EMULATION ?= y

# Install destination
DESTDIR ?= /tmp/test-mce-install

Expand Down Expand Up @@ -206,6 +209,10 @@ ifeq ($(ENABLE_HYBRIS),y)
CPPFLAGS += -DENABLE_HYBRIS
endif

ifeq ($(ENABLE_DOUBLETAP_EMULATION),y)
CPPFLAGS += -DENABLE_DOUBLETAP_EMULATION
endif

# C Compiler
CFLAGS += -std=c99

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8 changes: 8 additions & 0 deletions builtin-gconf.c
View file
Expand Up @@ -1306,6 +1306,14 @@ static const setting_t gconf_defaults[] =
.type = "i",
.def = "0",
},
#ifdef ENABLE_DOUBLETAP_EMULATION
{
// MCE_GCONF_USE_FAKE_DOUBLETAP_PATH @ event-input.h
.key = "/system/osso/dsm/event_input/use_fake_double_tap",
.type = "b",
.def = "false",
},
#endif
{
.key = NULL,
}
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250 changes: 250 additions & 0 deletions event-input.c
View file
Expand Up @@ -85,6 +85,10 @@
*/
#include "datapipe.h" /* execute_datapipe() */
#include "evdev.h"
#ifdef ENABLE_DOUBLETAP_EMULATION
# include "mce-gconf.h"
#endif

/** ID for touchscreen I/O monitor timeout source */
static guint touchscreen_io_monitor_timeout_cb_id = 0;

Expand Down Expand Up @@ -487,6 +491,16 @@ static evdev_type_t get_evdev_type(int fd)
goto cleanup;
}

/* In SDK we might bump into mouse devices, track them
* as if they were touch screen devices */
if( evdevinfo_has_code(feat, EV_KEY, BTN_MOUSE) &&
evdevinfo_has_code(feat, EV_REL, REL_X) &&
evdevinfo_has_code(feat, EV_REL, REL_Y) ) {
// mouse
res = EVDEV_TOUCH;
goto cleanup;
}

/* Some keys and swithes are processed at mce level */
if( evdevinfo_has_codes(feat, EV_KEY, keypad_lut ) ||
evdevinfo_has_codes(feat, EV_SW, switch_lut ) ) {
Expand Down Expand Up @@ -720,6 +734,205 @@ static void setup_touchscreen_io_monitor_timeout(void)
touchscreen_io_monitor_timeout_cb, NULL);
}

#ifdef ENABLE_DOUBLETAP_EMULATION

/** Fake doubletap policy */
static gboolean fake_doubletap_enabled = FALSE;

/** GConf callback ID for fake doubletap policy changes */
static guint fake_doubletap_id = 0;

/** Callback for handling changes to fake doubletap configuration
*
* @param client (not used)
* @param id (not used)
* @param entry GConf entry that changed
* @param data (not used)
*/
static void fake_doubletap_cb(GConfClient *const client, const guint id,
GConfEntry *const entry, gpointer const data)
{
(void)client; (void)id; (void)data;

gboolean enabled = fake_doubletap_enabled;
const GConfValue *value = 0;

if( entry && (value = gconf_entry_get_value(entry)) ) {
if( value->type == GCONF_VALUE_BOOL )
enabled = gconf_value_get_bool(value);
}
if( fake_doubletap_enabled != enabled ) {
mce_log(LL_NOTICE, "use fake doubletap change: %d -> %d",
fake_doubletap_enabled, enabled);
fake_doubletap_enabled = enabled;
}
}

/** Maximum time betweem 1st click and 2nd release, in milliseconds */
# define DOUBLETAP_TIME_LIMIT 500

/** Maximum distance between 1st and 2nd clicks, in pixels */
# define DOUBLETAP_DISTANCE_LIMIT 100

/** History data for emulating double tap */
typedef struct
{
struct timeval time;
int x,y;
int click;
} doubletap_t;

/** Check if two double tap history points are close enough in time
*
* @param e1 event data from the 1st click
* @param e2 event data from the 2nd release
*
* @return TRUE if e1 and e2 times are valid and close enough,
* or FALSE otherwise
*/
static int doubletap_time_p(const doubletap_t *e1, const doubletap_t *e2)
{
static const struct timeval limit =
{
.tv_sec = (DOUBLETAP_TIME_LIMIT / 1000),
.tv_usec = (DOUBLETAP_TIME_LIMIT % 1000) * 1000,
};

struct timeval delta;

/* Reject empty/reset slots */
if( !timerisset(&e1->time) || !timerisset(&e2->time) )
return 0;

timersub(&e2->time, &e1->time, &delta);
return timercmp(&delta, &limit, <);
}

/** Check if two double tap history points are close enough in pixels
*
* @param e1 event data from the 1st click
* @param e2 event data from the 2nd click
*
* @return TRUE if e1 and e2 positions are close enough, or FALSE otherwise
*/
static int doubletap_dist_p(const doubletap_t *e1, const doubletap_t *e2)
{
int x = e2->x - e1->x;
int y = e2->y - e1->y;
int r = DOUBLETAP_DISTANCE_LIMIT;

return (x*x + y*y) < (r*r);
}

/** Process mouse input events to simulate double tap
*
* Maintain a crude state machine, that will detect double clicks
* made with mouse when fed with evdev events from a mouse device.
*
* @param eve input event
*
* @return TRUE if double tap sequence was detected, FALSE otherwise
*/
static int doubletap_emulate(const struct input_event *eve)
{
static doubletap_t hist[4]; // click/release ring buffer

static unsigned i0 = 0; // current position
static int x_accum = 0; // x delta accumulator
static int y_accum = 0; // y delta accumulator
static int skip_syn = FALSE; // flag: skip SYN_REPORTS

int result = FALSE; // assume: no doubletap

unsigned i1, i2, i3; // 3 last positions

switch( eve->type ) {
case EV_REL:
/* Ignore EV_SYN unless we see EV_KEY too */
skip_syn = TRUE;
/* Accumulate X/Y position */
switch( eve->code ) {
case REL_X: x_accum += eve->value; break;
case REL_Y: y_accum += eve->value; break;
default: break;
}
break;

case EV_KEY:
/* Store click/release and position */
skip_syn = FALSE;
if( eve->code == BTN_MOUSE ) {
hist[i0].click += eve->value;
hist[i0].x = x_accum;
hist[i0].y = y_accum;
}
break;

case EV_ABS:
/* Do multitouch too while at it */
skip_syn = FALSE;
switch( eve->code ) {
case ABS_MT_TOUCH_MAJOR: hist[i0].click += 1; break;
case ABS_MT_POSITION_X: hist[i0].x = eve->value; break;
case ABS_MT_POSITION_Y: hist[i0].y = eve->value; break;
default: break;
}
break;

case EV_SYN:
if( eve->code != SYN_REPORT )
break;

/* Have we seen button events? */
if( skip_syn ) {
skip_syn = FALSE;
break;
}
/* Set timestamp from syn event */
hist[i0].time = eve->time;

/* Last event before current */
i1 = (i0 + 3) & 3;

if( hist[i1].click != hist[i0].click ) {
/* 2nd and 3rd last events before current */
i2 = (i0 + 2) & 3;
i3 = (i0 + 1) & 3;

/* Release after click after release after click,
* within the time and distance limits */
if( hist[i0].click == 0 && hist[i1].click == 1 &&
hist[i2].click == 0 && hist[i3].click == 1 &&
doubletap_time_p(&hist[i3], &hist[i0]) &&
doubletap_dist_p(&hist[i3], &hist[i1]) ) {
/* Reached DOUBLETAP state */
result = TRUE;

/* Reset history, so that triple click
* will not produce 2 double taps etc */
memset(hist, 0, sizeof hist);
x_accum = y_accum = 0;
}

/* Move to the next slot */
i0 = (i0 + 1) & 3;
}

/* Reset the current position in the ring buffer */
memset(&hist[i0], 0, sizeof *hist);
break;

default:
/* Unexpected events -> nothing to do at EV_SYN */
skip_syn = TRUE;
break;
}

return result;
}

#endif /* ENABLE_DOUBLETAP_EMULATION */

/**
* I/O monitor callback for the touchscreen
*
Expand Down Expand Up @@ -747,6 +960,25 @@ static gboolean touchscreen_iomon_cb(gpointer data, gsize bytes_read)
evdev_get_event_code_name(ev->type, ev->code),
ev->value);

#ifdef ENABLE_DOUBLETAP_EMULATION
if( fake_doubletap_enabled ) {
switch( datapipe_get_gint(display_state_pipe) ) {
case MCE_DISPLAY_OFF:
case MCE_DISPLAY_LPM_OFF:
case MCE_DISPLAY_LPM_ON:
if( doubletap_emulate(ev) ) {
mce_log(LL_NOTICE, "EMULATING DOUBLETAP");
ev->type = EV_MSC;
ev->code = MSC_GESTURE;
ev->value = 0x4;
}
break;
default:
break;
}
}
#endif

/* Ignore unwanted events */
if ((ev->type != EV_ABS) &&
(ev->type != EV_KEY) &&
Expand Down Expand Up @@ -1497,6 +1729,16 @@ gboolean mce_input_init(void)
GError *error = NULL;
gboolean status = FALSE;

#ifdef ENABLE_DOUBLETAP_EMULATION
/* Get fake doubletap policy configuration & track changes */
mce_gconf_notifier_add(MCE_GCONF_EVENT_INPUT_PATH,
MCE_GCONF_USE_FAKE_DOUBLETAP_PATH,
fake_doubletap_cb,
&fake_doubletap_id);
mce_gconf_get_bool(MCE_GCONF_USE_FAKE_DOUBLETAP_PATH,
&fake_doubletap_enabled);
#endif

/* Append triggers/filters to datapipes */
append_output_trigger_to_datapipe(&submode_pipe,
submode_trigger);
Expand Down Expand Up @@ -1552,6 +1794,14 @@ gboolean mce_input_init(void)
*/
void mce_input_exit(void)
{
#ifdef ENABLE_DOUBLETAP_EMULATION
/* Remove fake doubletap policy change notifier */
if( fake_doubletap_id ) {
mce_gconf_notifier_remove(GINT_TO_POINTER(fake_doubletap_id), 0);
fake_doubletap_id = 0;
}
#endif

/* Remove triggers/filters from datapipes */
remove_output_trigger_from_datapipe(&submode_pipe,
submode_trigger);
Expand Down
7 changes: 7 additions & 0 deletions event-input.h
View file
Expand Up @@ -32,6 +32,13 @@
/** Path to the GPIO key disable interface */
#define GPIO_KEY_DISABLE_PATH "/sys/devices/platform/gpio-keys/disabled_keys"

/** Path to the GConf settings for the event input */
#define MCE_GCONF_EVENT_INPUT_PATH "/system/osso/dsm/event_input"

#ifdef ENABLE_DOUBLETAP_EMULATION
/** Path to the use Fake Double Tap setting */
# define MCE_GCONF_USE_FAKE_DOUBLETAP_PATH MCE_GCONF_EVENT_INPUT_PATH "/use_fake_double_tap"
#endif

/**
* Delay between I/O monitoring setups and keypress repeats; 1 second
Expand Down

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