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[Linuxwacom-devel] [PATCH 3/9] Dynamically find touch channels, instead of hard-coding
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From: Jason G. <kil...@gm...> - 2012-09-29 23:56:17
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Right now the driver assumes that the first touch will always
be in channel 0, and the second touch (if present) is in
channel 1. This patch adds a new function to scan the channel
list for appropriate contacts, and uses it instead of the
hard-coded index accesses.
Signed-off-by: Jason Gerecke <kil...@gm...>
---
src/wcmTouchFilter.c | 113 ++++++++++++++++++++++++++++++++++-----------------
1 file changed, 76 insertions(+), 37 deletions(-)
diff --git a/src/wcmTouchFilter.c b/src/wcmTouchFilter.c
index 85de532..41a9a74 100644
--- a/src/wcmTouchFilter.c
+++ b/src/wcmTouchFilter.c
@@ -46,6 +46,55 @@
static void wcmFingerScroll(WacomDevicePtr priv);
static void wcmFingerZoom(WacomDevicePtr priv);
+/**
+ * Returns a pointer to the channel associated with the given contact
+ * number. The first contact made in a gesture will be number zero,
+ * the second number one, and so on.
+ *
+ * @param[in] common
+ * @param[in] num Contact number to search for
+ * @return Pointer to the associated channel, or NULL if none found
+ */
+static WacomChannelPtr getContactNumber(WacomCommonPtr common, int num)
+{
+ int i;
+
+ for (i = 0; i < MAX_CHANNELS; i++)
+ {
+ WacomChannelPtr channel = common->wcmChannel+i;
+ WacomDeviceState state = channel->valid.state;
+ if (state.device_type == TOUCH_ID && state.serial_num == num + 1)
+ return channel;
+ }
+
+ DBG(10, common, "Channel for contact number %d not found.\n", num);
+ return NULL;
+}
+
+/**
+ * Returns the device state for the first num contacts with specified
+ * age.
+ *
+ * @param[in] common
+ * @param[out] states List of device states to fill with history
+ * @param[in] num Length of states list
+ * @param[in] age Age of state information, zero being the most-current
+ */
+static void getStateHistory(WacomCommonPtr common, WacomDeviceState states[], int num, int age)
+{
+ int i;
+ for (i = 0; i < num; i++)
+ {
+ WacomChannelPtr channel = getContactNumber(common, i);
+ if (channel == NULL || i > ARRAY_SIZE(channel->valid.states))
+ {
+ DBG(7, common, "Could not get state history for contact %d, age %d.\n", i, age);
+ continue;
+ }
+ states[i] = channel->valid.states[age];
+ }
+}
+
static double touchDistance(WacomDeviceState ds0, WacomDeviceState ds1)
{
int xDelta = ds0.x - ds1.x;
@@ -116,12 +165,10 @@ static void wcmSendButtonClick(WacomDevicePtr priv, int button, int state)
static void wcmFingerTapToClick(WacomDevicePtr priv)
{
WacomCommonPtr common = priv->common;
- WacomChannelPtr firstChannel = common->wcmChannel;
- WacomChannelPtr secondChannel = common->wcmChannel + 1;
- WacomDeviceState ds[2] = { firstChannel->valid.states[0],
- secondChannel->valid.states[0] };
- WacomDeviceState dsLast[2] = { firstChannel->valid.states[1],
- secondChannel->valid.states[1] };
+ WacomDeviceState ds[2] = {{0}}, dsLast[2] = {{0}};
+
+ getStateHistory(common, ds, ARRAY_SIZE(ds), 0);
+ getStateHistory(common, dsLast, ARRAY_SIZE(dsLast), 1);
DBG(10, priv, "\n");
@@ -175,12 +222,10 @@ static CARD32 wcmSingleFingerTapTimer(OsTimerPtr timer, CARD32 time, pointer arg
static void wcmSingleFingerTap(WacomDevicePtr priv)
{
WacomCommonPtr common = priv->common;
- WacomChannelPtr firstChannel = common->wcmChannel;
- WacomChannelPtr secondChannel = common->wcmChannel + 1;
- WacomDeviceState ds[2] = { firstChannel->valid.states[0],
- secondChannel->valid.states[0] };
- WacomDeviceState dsLast[2] = { firstChannel->valid.states[1],
- secondChannel->valid.states[1] };
+ WacomDeviceState ds[2] = {{0}}, dsLast[2] = {{0}};
+
+ getStateHistory(common, ds, ARRAY_SIZE(ds), 0);
+ getStateHistory(common, dsLast, ARRAY_SIZE(dsLast), 1);
DBG(10, priv, "\n");
@@ -215,10 +260,10 @@ static void wcmSingleFingerTap(WacomDevicePtr priv)
static void wcmSingleFingerPress(WacomDevicePtr priv)
{
WacomCommonPtr common = priv->common;
- WacomChannelPtr firstChannel = common->wcmChannel;
- WacomChannelPtr secondChannel = common->wcmChannel + 1;
- WacomDeviceState ds[2] = { firstChannel->valid.states[0],
- secondChannel->valid.states[0] };
+ WacomChannelPtr firstChannel = getContactNumber(common, 0);
+ WacomChannelPtr secondChannel = getContactNumber(common, 1);
+ Bool firstInProx = firstChannel && firstChannel->valid.states[0].proximity;
+ Bool secondInProx = secondChannel && secondChannel->valid.states[0].proximity;
DBG(10, priv, "\n");
@@ -226,9 +271,9 @@ static void wcmSingleFingerPress(WacomDevicePtr priv)
if (!TabletHasFeature(priv->common, WCM_LCD))
return;
- if (ds[0].proximity && !ds[1].proximity)
+ if (firstInProx && !secondInProx)
firstChannel->valid.states[0].buttons |= 1;
- if (!ds[0].proximity && !ds[1].proximity)
+ if (!firstInProx && !secondInProx)
firstChannel->valid.states[0].buttons &= ~1;
}
@@ -236,12 +281,10 @@ static void wcmSingleFingerPress(WacomDevicePtr priv)
void wcmGestureFilter(WacomDevicePtr priv, int touch_id)
{
WacomCommonPtr common = priv->common;
- WacomChannelPtr firstChannel = common->wcmChannel;
- WacomChannelPtr secondChannel = common->wcmChannel + 1;
- WacomDeviceState ds[2] = { firstChannel->valid.states[0],
- secondChannel->valid.states[0] };
- WacomDeviceState dsLast[2] = { firstChannel->valid.states[1],
- secondChannel->valid.states[1] };
+ WacomDeviceState ds[2] = {{0}}, dsLast[2] = {{0}};
+
+ getStateHistory(common, ds, ARRAY_SIZE(ds), 0);
+ getStateHistory(common, dsLast, ARRAY_SIZE(dsLast), 1);
DBG(10, priv, "\n");
@@ -405,10 +448,9 @@ static void wcmSendScrollEvent(WacomDevicePtr priv, int dist,
WacomCommonPtr common = priv->common;
int count = (int)((1.0 * abs(dist)/
common->wcmGestureParameters.wcmScrollDistance) + 0.5);
- WacomChannelPtr firstChannel = common->wcmChannel;
- WacomChannelPtr secondChannel = common->wcmChannel + 1;
- WacomDeviceState ds[2] = { firstChannel->valid.states[0],
- secondChannel->valid.states[0] };
+ WacomDeviceState ds[2] = {{0}};
+
+ getStateHistory(common, ds, ARRAY_SIZE(ds), 0);
/* user might have changed from up to down or vice versa */
if (count < common->wcmGestureParameters.wcmGestureUsed)
@@ -432,17 +474,15 @@ static void wcmSendScrollEvent(WacomDevicePtr priv, int dist,
static void wcmFingerScroll(WacomDevicePtr priv)
{
WacomCommonPtr common = priv->common;
- WacomChannelPtr firstChannel = common->wcmChannel;
- WacomChannelPtr secondChannel = common->wcmChannel + 1;
- WacomDeviceState ds[2] = { firstChannel->valid.states[0],
- secondChannel->valid.states[0] };
-
+ WacomDeviceState ds[2] = {{0}};
int midPoint_new = 0;
int midPoint_old = 0;
int i = 0, dist = 0;
WacomFilterState filterd; /* borrow this struct */
int max_spread = common->wcmGestureParameters.wcmMaxScrollFingerSpread;
+ getStateHistory(common, ds, ARRAY_SIZE(ds), 0);
+
DBG(10, priv, "\n");
if (common->wcmGestureMode != GESTURE_SCROLL_MODE)
@@ -532,15 +572,14 @@ static void wcmFingerScroll(WacomDevicePtr priv)
static void wcmFingerZoom(WacomDevicePtr priv)
{
WacomCommonPtr common = priv->common;
- WacomChannelPtr firstChannel = common->wcmChannel;
- WacomChannelPtr secondChannel = common->wcmChannel + 1;
- WacomDeviceState ds[2] = { firstChannel->valid.states[0],
- secondChannel->valid.states[0] };
+ WacomDeviceState ds[2] = {{0}};
int count, button;
int dist = touchDistance(common->wcmGestureState[0],
common->wcmGestureState[1]);
int max_spread = common->wcmGestureParameters.wcmMaxScrollFingerSpread;
+ getStateHistory(common, ds, ARRAY_SIZE(ds), 0);
+
DBG(10, priv, "\n");
if (common->wcmGestureMode != GESTURE_ZOOM_MODE)
--
1.7.12
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