void VelocityTrackerState::computeCurrentVelocity(int32_t units, float maxVelocity) {
BitSet32 idBits(mVelocityTracker.getCurrentPointerIdBits());
mCalculatedIdBits = idBits;
for (uint32_t index = 0; !idBits.isEmpty(); index++) {
uint32_t id = idBits.clearFirstMarkedBit();
float vx, vy;
mVelocityTracker.getVelocity(id, &vx, &vy);
vx = vx * units / 1000;
vy = vy * units / 1000;
if (vx > maxVelocity) {
vx = maxVelocity;
} else if (vx < -maxVelocity) {
vx = -maxVelocity;
}
if (vy > maxVelocity) {
vy = maxVelocity;
} else if (vy < -maxVelocity) {
vy = -maxVelocity;
}
Velocity& velocity = mCalculatedVelocity[index];
velocity.vx = vx;
velocity.vy = vy;
}
}
void PointerController::setSpots(const PointerCoords* spotCoords,
const uint32_t* spotIdToIndex, BitSet32 spotIdBits) {
#if DEBUG_POINTER_UPDATES
ALOGD("setSpots: idBits=%08x", spotIdBits.value);
for (BitSet32 idBits(spotIdBits); !idBits.isEmpty(); ) {
uint32_t id = idBits.firstMarkedBit();
idBits.clearBit(id);
const PointerCoords& c = spotCoords[spotIdToIndex[id]];
ALOGD(" spot %d: position=(%0.3f, %0.3f), pressure=%0.3f", id,
c.getAxisValue(AMOTION_EVENT_AXIS_X),
c.getAxisValue(AMOTION_EVENT_AXIS_Y),
c.getAxisValue(AMOTION_EVENT_AXIS_PRESSURE));
}
#endif
AutoMutex _l(mLock);
mSpriteController->openTransaction();
// Add or move spots for fingers that are down.
for (BitSet32 idBits(spotIdBits); !idBits.isEmpty(); ) {
uint32_t id = idBits.clearFirstMarkedBit();
const PointerCoords& c = spotCoords[spotIdToIndex[id]];
const SpriteIcon& icon = c.getAxisValue(AMOTION_EVENT_AXIS_PRESSURE) > 0
? mResources.spotTouch : mResources.spotHover;
float x = c.getAxisValue(AMOTION_EVENT_AXIS_X);
float y = c.getAxisValue(AMOTION_EVENT_AXIS_Y);
Spot* spot = getSpotLocked(id);
if (!spot) {
spot = createAndAddSpotLocked(id);
}
spot->updateSprite(&icon, x, y);
}
// Remove spots for fingers that went up.
for (size_t i = 0; i < mLocked.spots.size(); i++) {
Spot* spot = mLocked.spots.itemAt(i);
if (spot->id != Spot::INVALID_ID
&& !spotIdBits.hasBit(spot->id)) {
fadeOutAndReleaseSpotLocked(spot);
}
}
mSpriteController->closeTransaction();
}