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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LATINIME_PROXIMITY_INFO_H
#define LATINIME_PROXIMITY_INFO_H
#include <stdint.h>
#include "defines.h"
namespace latinime {
class Correction;
class ProximityInfo {
public:
static const int NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR_LOG_2 = 10;
static const int NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR =
1 << NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR_LOG_2;
// Used as a return value for character comparison
typedef enum {
// Same char, possibly with different case or accent
EQUIVALENT_CHAR,
// It is a char located nearby on the keyboard
NEAR_PROXIMITY_CHAR,
// It is an unrelated char
UNRELATED_CHAR
} ProximityType;
ProximityInfo(const int maxProximityCharsSize, const int keyboardWidth,
const int keybaordHeight, const int gridWidth, const int gridHeight,
const uint32_t *proximityCharsArray, const int keyCount, const int32_t *keyXCoordinates,
const int32_t *keyYCoordinates, const int32_t *keyWidths, const int32_t *keyHeights,
const int32_t *keyCharCodes, const float *sweetSpotCenterXs,
const float *sweetSpotCenterYs, const float *sweetSpotRadii);
~ProximityInfo();
bool hasSpaceProximity(const int x, const int y) const;
void setInputParams(const int* inputCodes, const int inputLength,
const int *xCoordinates, const int *yCoordinates);
const int* getProximityCharsAt(const int index) const;
unsigned short getPrimaryCharAt(const int index) const;
bool existsCharInProximityAt(const int index, const int c) const;
bool existsAdjacentProximityChars(const int index) const;
ProximityType getMatchedProximityId(const int index, const unsigned short c,
const bool checkProximityChars, int *proximityIndex = NULL) const;
int getNormalizedSquaredDistance(const int inputIndex, const int proximityIndex) const {
return mNormalizedSquaredDistances[inputIndex * MAX_PROXIMITY_CHARS_SIZE + proximityIndex];
}
bool sameAsTyped(const unsigned short *word, int length) const;
const unsigned short* getPrimaryInputWord() const {
return mPrimaryInputWord;
}
bool touchPositionCorrectionEnabled() const {
return mTouchPositionCorrectionEnabled;
}
private:
// The max number of the keys in one keyboard layout
static const int MAX_KEY_COUNT_IN_A_KEYBOARD = 64;
// The upper limit of the char code in mCodeToKeyIndex
static const int MAX_CHAR_CODE = 127;
int getStartIndexFromCoordinates(const int x, const int y) const;
void initializeCodeToKeyIndex();
float calculateNormalizedSquaredDistance(const int keyIndex, const int inputIndex) const;
float calculateSquaredDistanceFromSweetSpotCenter(
const int keyIndex, const int inputIndex) const;
int getKeyIndex(const int c) const;
bool hasSweetSpotData(const int keyIndex) const {
// When there are no calibration data for a key,
// the radius of the key is assigned to zero.
return mSweetSpotRadii[keyIndex] > 0.0;
}
const int MAX_PROXIMITY_CHARS_SIZE;
const int KEYBOARD_WIDTH;
const int KEYBOARD_HEIGHT;
const int GRID_WIDTH;
const int GRID_HEIGHT;
const int CELL_WIDTH;
const int CELL_HEIGHT;
const int KEY_COUNT;
const bool HAS_TOUCH_POSITION_CORRECTION_DATA;
const int *mInputCodes;
const int *mInputXCoordinates;
const int *mInputYCoordinates;
bool mTouchPositionCorrectionEnabled;
uint32_t *mProximityCharsArray;
int *mNormalizedSquaredDistances;
int32_t mKeyXCoordinates[MAX_KEY_COUNT_IN_A_KEYBOARD];
int32_t mKeyYCoordinates[MAX_KEY_COUNT_IN_A_KEYBOARD];
int32_t mKeyWidths[MAX_KEY_COUNT_IN_A_KEYBOARD];
int32_t mKeyHeights[MAX_KEY_COUNT_IN_A_KEYBOARD];
int32_t mKeyCharCodes[MAX_KEY_COUNT_IN_A_KEYBOARD];
float mSweetSpotCenterXs[MAX_KEY_COUNT_IN_A_KEYBOARD];
float mSweetSpotCenterYs[MAX_KEY_COUNT_IN_A_KEYBOARD];
float mSweetSpotRadii[MAX_KEY_COUNT_IN_A_KEYBOARD];
int mInputLength;
unsigned short mPrimaryInputWord[MAX_WORD_LENGTH_INTERNAL];
int mCodeToKeyIndex[MAX_CHAR_CODE + 1];
};
} // namespace latinime
#endif // LATINIME_PROXIMITY_INFO_H
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