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Smart sampling for geometric inputs.

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Gesture:
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Gesture incremental:
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On device:
0: all, 1:initialize

(0)  56285.82 (99.99%)
(1)  3886.59 (6.90%)
->
(0)  42795.78 (99.98%)
(1)  3916.80 (9.15%)

Change-Id: I3eed99cbd75b22fd2d8b5404a4f7e0972f284a85
This commit is contained in:
Keisuke Kuroyanagi 2012-08-31 21:22:14 +09:00
parent 8251036616
commit d9c10b1979
2 changed files with 198 additions and 17 deletions
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196
native/jni/src/proximity_info_state.cpp
View file

@ -76,10 +76,24 @@ void ProximityInfoState::initInputParams(const int pointerId, const float maxPoi
mTimes.clear();
mLengthCache.clear();
mDistanceCache.clear();
mInputSize = 0;
if (xCoordinates && yCoordinates) {
const bool proximityOnly = !isGeometric && (xCoordinates[0] < 0 || yCoordinates[0] < 0);
int lastInputIndex = 0;
for (int i = 0; i < inputSize; ++i) {
const int pid = pointerIds ? pointerIds[i] : 0;
if (pointerId == pid) {
lastInputIndex = i;
}
}
// Working space to save near keys distances for current, prev and prevprev input point.
NearKeysDistanceMap nearKeysDistances[3];
// These pointers are swapped for each inputs points.
NearKeysDistanceMap *currentNearKeysDistances = &nearKeysDistances[0];
NearKeysDistanceMap *prevNearKeysDistances = &nearKeysDistances[1];
NearKeysDistanceMap *prevPrevNearKeysDistances = &nearKeysDistances[2];
for (int i = 0; i < inputSize; ++i) {
// Assuming pointerId == 0 if pointerIds is null.
const int pid = pointerIds ? pointerIds[i] : 0;
@ -88,11 +102,22 @@ void ProximityInfoState::initInputParams(const int pointerId, const float maxPoi
const int x = proximityOnly ? NOT_A_COORDINATE : xCoordinates[i];
const int y = proximityOnly ? NOT_A_COORDINATE : yCoordinates[i];
const int time = times ? times[i] : -1;
if (pushTouchPoint(c, x, y, time, isGeometric)) {
++mInputSize;
if (pushTouchPoint(c, x, y, time, isGeometric, i == lastInputIndex,
currentNearKeysDistances, prevNearKeysDistances,
prevPrevNearKeysDistances)) {
// Previous point information was popped.
NearKeysDistanceMap *tmp = prevNearKeysDistances;
prevNearKeysDistances = currentNearKeysDistances;
currentNearKeysDistances = tmp;
} else {
NearKeysDistanceMap *tmp = prevPrevNearKeysDistances;
prevPrevNearKeysDistances = prevNearKeysDistances;
prevNearKeysDistances = currentNearKeysDistances;
currentNearKeysDistances = tmp;
}
}
}
mInputSize = mInputXs.size();
}
if (mInputSize > 0) {
@ -153,20 +178,151 @@ void ProximityInfoState::initInputParams(const int pointerId, const float maxPoi
}
}
bool ProximityInfoState::pushTouchPoint(const int nodeChar, int x, int y,
const int time, const bool sample) {
const uint32_t size = mInputXs.size();
// TODO: Should have a const variable for 10
const int sampleRate = mProximityInfo->getMostCommonKeyWidth() / 10;
if (size > 0) {
const int dist = getDistanceInt(x, y, mInputXs[size - 1], mInputYs[size - 1]);
if (sample && dist < sampleRate) {
return false;
// Calculating point to key distance for all near keys and returning the distance between
// the given point and the nearest key position.
float ProximityInfoState::updateNearKeysDistances(const int x, const int y,
NearKeysDistanceMap *const currentNearKeysDistances) {
static const float NEAR_KEY_THRESHOLD = 10.0f;
currentNearKeysDistances->clear();
const int keyCount = mProximityInfo->getKeyCount();
float nearestKeyDistance = mMaxPointToKeyLength;
for (int k = 0; k < keyCount; ++k) {
const float dist = mProximityInfo->getNormalizedSquaredDistanceFromCenterFloat(k, x, y);
if (dist < NEAR_KEY_THRESHOLD) {
currentNearKeysDistances->insert(std::pair<int, float>(k, dist));
}
if (nearestKeyDistance > dist) {
nearestKeyDistance = dist;
}
mLengthCache.push_back(mLengthCache[size - 1] + dist);
} else {
mLengthCache.push_back(0);
}
return nearestKeyDistance;
}
// Check if previous point is at local minimum position to near keys.
bool ProximityInfoState::isPrevLocalMin(const NearKeysDistanceMap *const currentNearKeysDistances,
const NearKeysDistanceMap *const prevNearKeysDistances,
const NearKeysDistanceMap *const prevPrevNearKeysDistances) const {
static const float MARGIN = 0.5f;
for (NearKeysDistanceMap::const_iterator it = prevNearKeysDistances->begin();
it != prevNearKeysDistances->end(); ++it) {
NearKeysDistanceMap::const_iterator itPP = prevPrevNearKeysDistances->find(it->first);
NearKeysDistanceMap::const_iterator itC = currentNearKeysDistances->find(it->first);
if ((itPP == prevPrevNearKeysDistances->end() || itPP->second > it->second + MARGIN)
&& (itC == currentNearKeysDistances->end() || itC->second > it->second + MARGIN)) {
return true;
}
}
return false;
}
// Calculating a point score that indicates usefulness of the point.
float ProximityInfoState::getPointScore(
const int x, const int y, const int time, const bool lastPoint, const float nearest,
const NearKeysDistanceMap *const currentNearKeysDistances,
const NearKeysDistanceMap *const prevNearKeysDistances,
const NearKeysDistanceMap *const prevPrevNearKeysDistances) const {
static const float BASE_SAMPLE_RATE_SCALE = 0.1f;
static const float SAVE_DISTANCE_SCALE = 12.0f;
static const float SAVE_DISTANCE_SCORE = 2.0f;
static const float SKIP_DISTANCE_SCALE = 1.5f;
static const float SKIP_DISTANCE_SCORE = -1.0f;
static const float CHECK_LOCALMIN_DISTANCE_THRESHOLD_SCALE = 2.5f;
static const float CHECK_LOCALMIN_DISTANCE_SCORE = -1.0f;
static const float STRAIGHT_ANGLE_THRESHOLD = M_PI_F / 32.0f;
static const float STRAIGHT_SKIP_DISTANCE_THRESHOLD_SCALE = 4.0f;
static const float STRAIGHT_SKIP_NEAREST_DISTANCE_THRESHOLD = 0.5f;
static const float STRAIGHT_SKIP_SCORE = -1.0f;
const std::size_t size = mInputXs.size();
if (size <= 1) {
return 0;
}
const float baseSampleRate = mProximityInfo->getMostCommonKeyWidth() * BASE_SAMPLE_RATE_SCALE;
const float distNext = getDistanceFloat(x, y, mInputXs.back(), mInputYs.back());
const float distPrev = getDistanceFloat(mInputXs.back(), mInputYs.back(),
mInputXs[size - 2], mInputYs[size - 2]);
float score = 0.0f;
// Sum of distances
if (distPrev + distNext > baseSampleRate * SAVE_DISTANCE_SCALE) {
score += SAVE_DISTANCE_SCORE;
}
// Distance
if (distPrev < baseSampleRate * SKIP_DISTANCE_SCALE) {
score += SKIP_DISTANCE_SCORE;
}
// Location
if (!isPrevLocalMin(currentNearKeysDistances, currentNearKeysDistances,
prevPrevNearKeysDistances)) {
if (distPrev < baseSampleRate * CHECK_LOCALMIN_DISTANCE_THRESHOLD_SCALE) {
score += CHECK_LOCALMIN_DISTANCE_SCORE;
}
}
// Angle
const float angle1 = getAngle(x, y, mInputXs.back(), mInputYs.back());
const float angle2 = getAngle(mInputXs.back(), mInputYs.back(),
mInputXs[size - 2], mInputYs[size - 2]);
if (getAngleDiff(angle1, angle2) < STRAIGHT_ANGLE_THRESHOLD) {
if (nearest > STRAIGHT_SKIP_NEAREST_DISTANCE_THRESHOLD
&& distPrev < baseSampleRate * STRAIGHT_SKIP_DISTANCE_THRESHOLD_SCALE) {
score += STRAIGHT_SKIP_SCORE;
}
}
return score;
}
// Sampling touch point and pushing information to vectors.
// Returning if previous point is popped or not.
bool ProximityInfoState::pushTouchPoint(const int nodeChar, int x, int y, const int time,
const bool sample, const bool isLastPoint,
NearKeysDistanceMap *const currentNearKeysDistances,
const NearKeysDistanceMap *const prevNearKeysDistances,
const NearKeysDistanceMap *const prevPrevNearKeysDistances) {
static const float LAST_POINT_SKIP_DISTANCE_SCALE = 0.25f;
uint32_t size = mInputXs.size();
bool popped = false;
if (nodeChar < 0 && sample) {
const float nearest = updateNearKeysDistances(x, y, currentNearKeysDistances);
const float score = getPointScore(x, y, time, isLastPoint, nearest,
currentNearKeysDistances, prevNearKeysDistances, prevPrevNearKeysDistances);
if (score < 0) {
// Pop previous point because it would be useless.
mInputXs.pop_back();
mInputYs.pop_back();
mTimes.pop_back();
mLengthCache.pop_back();
size = mInputXs.size();
popped = true;
} else {
popped = false;
}
// Check if the last point should be skipped.
if (isLastPoint) {
if (size > 0 && getDistanceFloat(x, y, mInputXs.back(), mInputYs.back())
< mProximityInfo->getMostCommonKeyWidth() * LAST_POINT_SKIP_DISTANCE_SCALE) {
return popped;
} else if (size > 1) {
int minChar = 0;
float minDist = mMaxPointToKeyLength;
for (NearKeysDistanceMap::const_iterator it = currentNearKeysDistances->begin();
it != currentNearKeysDistances->end(); ++it) {
if(minDist > it->second){
minChar = it->first;
minDist = it->second;
}
}
NearKeysDistanceMap::const_iterator itPP =
prevNearKeysDistances->find(minChar);
if (itPP != prevNearKeysDistances->end() && minDist > itPP->second) {
return popped;
}
}
}
}
if (nodeChar >= 0 && (x < 0 || y < 0)) {
const int keyId = mProximityInfo->getKeyIndex(nodeChar);
if (keyId >= 0) {
@ -174,10 +330,18 @@ bool ProximityInfoState::pushTouchPoint(const int nodeChar, int x, int y,
y = mProximityInfo->getKeyCenterYOfIdG(keyId);
}
}
// Pushing point information.
if (size > 0) {
mLengthCache.push_back(
mLengthCache.back() + getDistanceInt(x, y, mInputXs.back(), mInputYs.back()));
} else {
mLengthCache.push_back(0);
}
mInputXs.push_back(x);
mInputYs.push_back(y);
mTimes.push_back(time);
return true;
return popped;
}
float ProximityInfoState::calculateNormalizedSquaredDistance(

19
native/jni/src/proximity_info_state.h
View file

@ -24,6 +24,7 @@
#include "char_utils.h"
#include "defines.h"
#include "hash_map_compat.h"
namespace latinime {
@ -216,6 +217,7 @@ class ProximityInfoState {
private:
DISALLOW_COPY_AND_ASSIGN(ProximityInfoState);
typedef hash_map_compat<int, float> NearKeysDistanceMap;
/////////////////////////////////////////
// Defined in proximity_info_state.cpp //
/////////////////////////////////////////
@ -224,7 +226,11 @@ class ProximityInfoState {
float calculateSquaredDistanceFromSweetSpotCenter(
const int keyIndex, const int inputIndex) const;
bool pushTouchPoint(const int nodeChar, int x, int y, const int time, const bool sample);
bool pushTouchPoint(const int nodeChar, int x, int y, const int time,
const bool sample, const bool isLastPoint,
NearKeysDistanceMap *const currentNearKeysDistances,
const NearKeysDistanceMap *const prevNearKeysDistances,
const NearKeysDistanceMap *const prevPrevNearKeysDistances);
/////////////////////////////////////////
// Defined here //
/////////////////////////////////////////
@ -238,6 +244,17 @@ class ProximityInfoState {
return mInputCodes + (index * MAX_PROXIMITY_CHARS_SIZE_INTERNAL);
}
float updateNearKeysDistances(const int x, const int y,
NearKeysDistanceMap *const currentNearKeysDistances);
bool isPrevLocalMin(const NearKeysDistanceMap *const currentNearKeysDistances,
const NearKeysDistanceMap *const prevNearKeysDistances,
const NearKeysDistanceMap *const prevPrevNearKeysDistances) const;
float getPointScore(
const int x, const int y, const int time, const bool last, const float nearest,
const NearKeysDistanceMap *const currentNearKeysDistances,
const NearKeysDistanceMap *const prevNearKeysDistances,
const NearKeysDistanceMap *const prevPrevNearKeysDistances) const;
// const
const ProximityInfo *mProximityInfo;
float mMaxPointToKeyLength;