am 4bd89fb0: am 82e4373e: Merge "Use touch pad gestures to manipulate the... (446b4009) · Commits · e / devices / smdk4412 / android_frameworks_native

include/ui/Input.h

+55 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,7 @@
		#include <utils/Timers.h>
		#include <utils/RefBase.h>
		#include <utils/String8.h>
		#include <utils/BitSet.h>

		#ifdef HAVE_ANDROID_OS
		class SkMatrix;
		@@ -210,6 +211,13 @@ struct PointerCoords {
		status_t writeToParcel(Parcel* parcel) const;
		#endif

		bool operator==(const PointerCoords& other) const;
		inline bool operator!=(const PointerCoords& other) const {
		return !(*this == other);
		}

		void copyFrom(const PointerCoords& other);

		private:
		void tooManyAxes(int axis);
		};
		@@ -544,6 +552,53 @@ private:
		MotionEvent mMotionEvent;
		};

		/*
		* Calculates the velocity of pointer motions over time.
		* Uses essentially the same algorithm as android.view.VelocityTracker.
		*/
		class VelocityTracker {
		public:
		struct Position {
		float x, y;
		};

		VelocityTracker();

		// Resets the velocity tracker state.
		void clear();

		// Adds movement information for a set of pointers.
		// The idBits bitfield specifies the pointer ids of the pointers whose positions
		// are included in the movement.
		// The positions array contains position information for each pointer in order by
		// increasing id. Its size should be equal to the number of one bits in idBits.
		void addMovement(nsecs_t eventTime, BitSet32 idBits, const Position* positions);

		// Gets the velocity of the specified pointer id in position units per second.
		// Returns false and sets the velocity components to zero if there is no movement
		// information for the pointer.
		bool getVelocity(uint32_t id, float* outVx, float* outVy) const;

		private:
		// Number of samples to keep.
		static const uint32_t HISTORY_SIZE = 10;

		// Oldest sample to consider when calculating the velocity.
		static const nsecs_t MAX_AGE = 200 * 1000000; // 200 ms

		// The minimum duration between samples when estimating velocity.
		static const nsecs_t MIN_DURATION = 5 * 1000000; // 5 ms

		struct Movement {
		nsecs_t eventTime;
		BitSet32 idBits;
		Position positions[MAX_POINTERS];
		};

		uint32_t mIndex;
		Movement mMovements[HISTORY_SIZE];
		};

		/*
		* Describes the characteristics and capabilities of an input device.
		*/

include/utils/BitSet.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -61,6 +61,12 @@ struct BitSet32 {
		// Result is undefined if all bits are marked.
		inline uint32_t firstUnmarkedBit() const { return __builtin_clz(~ value); }

		// Gets the index of the specified bit in the set, which is the number of
		// marked bits that appear before the specified bit.
		inline uint32_t getIndexOfBit(uint32_t n) const {
		return __builtin_popcount(value & ~(0xffffffffUL >> n));
		}

		inline bool operator== (const BitSet32& other) const { return value == other.value; }
		inline bool operator!= (const BitSet32& other) const { return value != other.value; }
		};

libs/ui/Input.cpp

+154 −0

Original line number	Diff line number	Diff line
		@@ -7,8 +7,12 @@

		//#define LOG_NDEBUG 0

		// Log debug messages about keymap probing.
		#define DEBUG_PROBE 0

		// Log debug messages about velocity tracking.
		#define DEBUG_VELOCITY 0

		#include <stdlib.h>
		#include <unistd.h>
		#include <ctype.h>
		@@ -347,6 +351,27 @@ void PointerCoords::tooManyAxes(int axis) {
		"cannot contain more than %d axis values.", axis, int(MAX_AXES));
		}

		bool PointerCoords::operator==(const PointerCoords& other) const {
		if (bits != other.bits) {
		return false;
		}
		uint32_t count = __builtin_popcountll(bits);
		for (uint32_t i = 0; i < count; i++) {
		if (values[i] != other.values[i]) {
		return false;
		}
		}
		return true;
		}

		void PointerCoords::copyFrom(const PointerCoords& other) {
		bits = other.bits;
		uint32_t count = __builtin_popcountll(bits);
		for (uint32_t i = 0; i < count; i++) {
		values[i] = other.values[i];
		}
		}


		// --- MotionEvent ---

		@@ -633,6 +658,135 @@ bool MotionEvent::isTouchEvent(int32_t source, int32_t action) {
		}


		// --- VelocityTracker ---

		VelocityTracker::VelocityTracker() {
		clear();
		}

		void VelocityTracker::clear() {
		mIndex = 0;
		mMovements[0].idBits.clear();
		}

		void VelocityTracker::addMovement(nsecs_t eventTime, BitSet32 idBits, const Position* positions) {
		if (++mIndex == HISTORY_SIZE) {
		mIndex = 0;
		}
		Movement& movement = mMovements[mIndex];
		movement.eventTime = eventTime;
		movement.idBits = idBits;
		uint32_t count = idBits.count();
		for (uint32_t i = 0; i < count; i++) {
		movement.positions[i] = positions[i];
		}

		#if DEBUG_VELOCITY
		LOGD("VelocityTracker: addMovement eventTime=%lld, idBits=0x%08x", eventTime, idBits.value);
		for (BitSet32 iterBits(idBits); !iterBits.isEmpty(); ) {
		uint32_t id = iterBits.firstMarkedBit();
		uint32_t index = idBits.getIndexOfBit(id);
		iterBits.clearBit(id);
		float vx, vy;
		bool available = getVelocity(id, &vx, &vy);
		if (available) {
		LOGD(" %d: position (%0.3f, %0.3f), velocity (%0.3f, %0.3f), speed %0.3f",
		id, positions[index].x, positions[index].y, vx, vy, sqrtf(vx * vx + vy * vy));
		} else {
		assert(vx == 0 && vy == 0);
		LOGD(" %d: position (%0.3f, %0.3f), velocity not available",
		id, positions[index].x, positions[index].y);
		}
		}
		#endif
		}

		bool VelocityTracker::getVelocity(uint32_t id, float* outVx, float* outVy) const {
		const Movement& newestMovement = mMovements[mIndex];
		if (newestMovement.idBits.hasBit(id)) {
		// Find the oldest sample that contains the pointer and that is not older than MAX_AGE.
		nsecs_t minTime = newestMovement.eventTime - MAX_AGE;
		uint32_t oldestIndex = mIndex;
		uint32_t numTouches = 1;
		do {
		uint32_t nextOldestIndex = (oldestIndex == 0 ? HISTORY_SIZE : oldestIndex) - 1;
		const Movement& nextOldestMovement = mMovements[nextOldestIndex];
		if (!nextOldestMovement.idBits.hasBit(id)
		\|\| nextOldestMovement.eventTime < minTime) {
		break;
		}
		oldestIndex = nextOldestIndex;
		} while (++numTouches < HISTORY_SIZE);

		// If we have a lot of samples, skip the last received sample since it is
		// probably pretty noisy compared to the sum of all of the traces already acquired.
		//
		// NOTE: This condition exists in the android.view.VelocityTracker and imposes a
		// bias against the most recent data.
		if (numTouches > 3) {
		numTouches -= 1;
		}

		// Calculate an exponentially weighted moving average of the velocity at different
		// points in time measured relative to the oldest samples. This is essentially
		// an IIR filter.
		//
		// One problem with this algorithm is that the sample data may be poorly conditioned.
		// Sometimes samples arrive very close together in time which can cause us to
		// overestimate the velocity at that time point. Most samples might be measured
		// 16ms apart but some consecutive samples could be only 0.5sm apart due to
		// the way they are reported by the hardware or driver (sometimes in bursts or with
		// significant jitter). The instantaneous velocity for those samples 0.5ms apart will
		// be calculated to be 32 times what it should have been.
		// To work around this effect, we impose a minimum duration on the samples.
		//
		// FIXME: Samples close together in time can have an disproportionately large
		// impact on the result because all samples are equally weighted. The average should
		// instead take the time factor into account.
		//
		// FIXME: The minimum duration condition does not exist in
		// android.view.VelocityTracker yet. It is less important there because sample times
		// are truncated to the millisecond so back to back samples will often appear to be
		// zero milliseconds apart and will be ignored if they are the oldest ones.
		float accumVx = 0;
		float accumVy = 0;
		uint32_t index = oldestIndex;
		uint32_t samplesUsed = 0;
		const Movement& oldestMovement = mMovements[oldestIndex];
		const Position& oldestPosition =
		oldestMovement.positions[oldestMovement.idBits.getIndexOfBit(id)];
		while (numTouches-- > 1) {
		if (++index == HISTORY_SIZE) {
		index = 0;
		}
		const Movement& movement = mMovements[index];
		nsecs_t duration = movement.eventTime - oldestMovement.eventTime;
		if (duration > MIN_DURATION) {
		const Position& position = movement.positions[movement.idBits.getIndexOfBit(id)];
		float scale = 1000000000.0f / duration; // one over time delta in seconds
		float vx = (position.x - oldestPosition.x) * scale;
		float vy = (position.y - oldestPosition.y) * scale;
		accumVx = accumVx == 0 ? vx : (accumVx + vx) * 0.5f;
		accumVy = accumVy == 0 ? vy : (accumVy + vy) * 0.5f;
		samplesUsed += 1;
		}
		}

		// Make sure we used at least one sample.
		if (samplesUsed != 0) {
		*outVx = accumVx;
		*outVy = accumVy;
		return true;
		}
		}

		// No data available for this pointer.
		*outVx = 0;
		*outVy = 0;
		return false;
		}


		// --- InputDeviceInfo ---

		InputDeviceInfo::InputDeviceInfo() {

libs/ui/InputTransport.cpp

+2 −2

Original line number	Diff line number	Diff line
		@@ -406,7 +406,7 @@ status_t InputPublisher::publishMotionEvent(

		for (size_t i = 0; i < pointerCount; i++) {
		mSharedMessage->motion.pointerIds[i] = pointerIds[i];
		mSharedMessage->motion.sampleData[0].coords[i] = pointerCoords[i];
		mSharedMessage->motion.sampleData[0].coords[i].copyFrom(pointerCoords[i]);
		}

		// Cache essential information about the motion event to ensure that a malicious consumer
		@@ -475,7 +475,7 @@ status_t InputPublisher::appendMotionSample(

		mMotionEventSampleDataTail->eventTime = eventTime;
		for (size_t i = 0; i < mMotionEventPointerCount; i++) {
		mMotionEventSampleDataTail->coords[i] = pointerCoords[i];
		mMotionEventSampleDataTail->coords[i].copyFrom(pointerCoords[i]);
		}
		mMotionEventSampleDataTail = newTail;