296 lines
12 KiB
C++
296 lines
12 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#define LOG_TAG "LatinIME: proximity_info.cpp"
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#include "dictionary.h"
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#include "proximity_info.h"
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namespace latinime {
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inline void copyOrFillZero(void *to, const void *from, size_t size) {
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if (from) {
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memcpy(to, from, size);
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} else {
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memset(to, 0, size);
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}
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}
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ProximityInfo::ProximityInfo(const int maxProximityCharsSize, const int keyboardWidth,
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const int keyboardHeight, const int gridWidth, const int gridHeight,
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const uint32_t *proximityCharsArray, const int keyCount, const int32_t *keyXCoordinates,
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const int32_t *keyYCoordinates, const int32_t *keyWidths, const int32_t *keyHeights,
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const int32_t *keyCharCodes, const float *sweetSpotCenterXs, const float *sweetSpotCenterYs,
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const float *sweetSpotRadii)
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: MAX_PROXIMITY_CHARS_SIZE(maxProximityCharsSize), KEYBOARD_WIDTH(keyboardWidth),
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KEYBOARD_HEIGHT(keyboardHeight), GRID_WIDTH(gridWidth), GRID_HEIGHT(gridHeight),
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CELL_WIDTH((keyboardWidth + gridWidth - 1) / gridWidth),
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CELL_HEIGHT((keyboardHeight + gridHeight - 1) / gridHeight),
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KEY_COUNT(min(keyCount, MAX_KEY_COUNT_IN_A_KEYBOARD)),
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HAS_TOUCH_POSITION_CORRECTION_DATA(keyCount > 0 && keyXCoordinates && keyYCoordinates
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&& keyWidths && keyHeights && keyCharCodes && sweetSpotCenterXs
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&& sweetSpotCenterYs && sweetSpotRadii),
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mInputXCoordinates(0), mInputYCoordinates(0),
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mTouchPositionCorrectionEnabled(false) {
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const int proximityGridLength = GRID_WIDTH * GRID_HEIGHT * MAX_PROXIMITY_CHARS_SIZE;
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mProximityCharsArray = new uint32_t[proximityGridLength];
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if (DEBUG_PROXIMITY_INFO) {
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LOGI("Create proximity info array %d", proximityGridLength);
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}
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memcpy(mProximityCharsArray, proximityCharsArray,
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proximityGridLength * sizeof(mProximityCharsArray[0]));
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const int normalizedSquaredDistancesLength =
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MAX_PROXIMITY_CHARS_SIZE * MAX_WORD_LENGTH_INTERNAL;
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mNormalizedSquaredDistances = new int[normalizedSquaredDistancesLength];
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for (int i = 0; i < normalizedSquaredDistancesLength; ++i) {
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mNormalizedSquaredDistances[i] = NOT_A_DISTANCE;
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}
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copyOrFillZero(mKeyXCoordinates, keyXCoordinates, KEY_COUNT * sizeof(mKeyXCoordinates[0]));
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copyOrFillZero(mKeyYCoordinates, keyYCoordinates, KEY_COUNT * sizeof(mKeyYCoordinates[0]));
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copyOrFillZero(mKeyWidths, keyWidths, KEY_COUNT * sizeof(mKeyWidths[0]));
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copyOrFillZero(mKeyHeights, keyHeights, KEY_COUNT * sizeof(mKeyHeights[0]));
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copyOrFillZero(mKeyCharCodes, keyCharCodes, KEY_COUNT * sizeof(mKeyCharCodes[0]));
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copyOrFillZero(mSweetSpotCenterXs, sweetSpotCenterXs,
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KEY_COUNT * sizeof(mSweetSpotCenterXs[0]));
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copyOrFillZero(mSweetSpotCenterYs, sweetSpotCenterYs,
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KEY_COUNT * sizeof(mSweetSpotCenterYs[0]));
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copyOrFillZero(mSweetSpotRadii, sweetSpotRadii, KEY_COUNT * sizeof(mSweetSpotRadii[0]));
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initializeCodeToKeyIndex();
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}
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// Build the reversed look up table from the char code to the index in mKeyXCoordinates,
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// mKeyYCoordinates, mKeyWidths, mKeyHeights, mKeyCharCodes.
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void ProximityInfo::initializeCodeToKeyIndex() {
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memset(mCodeToKeyIndex, -1, (MAX_CHAR_CODE + 1) * sizeof(mCodeToKeyIndex[0]));
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for (int i = 0; i < KEY_COUNT; ++i) {
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const int code = mKeyCharCodes[i];
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if (0 <= code && code <= MAX_CHAR_CODE) {
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mCodeToKeyIndex[code] = i;
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}
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}
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}
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ProximityInfo::~ProximityInfo() {
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delete[] mNormalizedSquaredDistances;
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delete[] mProximityCharsArray;
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}
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inline int ProximityInfo::getStartIndexFromCoordinates(const int x, const int y) const {
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return ((y / CELL_HEIGHT) * GRID_WIDTH + (x / CELL_WIDTH))
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* MAX_PROXIMITY_CHARS_SIZE;
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}
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bool ProximityInfo::hasSpaceProximity(const int x, const int y) const {
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if (x < 0 || y < 0) {
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if (DEBUG_DICT) {
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LOGI("HasSpaceProximity: Illegal coordinates (%d, %d)", x, y);
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assert(false);
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}
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return false;
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}
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const int startIndex = getStartIndexFromCoordinates(x, y);
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if (DEBUG_PROXIMITY_INFO) {
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LOGI("hasSpaceProximity: index %d, %d, %d", startIndex, x, y);
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}
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for (int i = 0; i < MAX_PROXIMITY_CHARS_SIZE; ++i) {
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if (DEBUG_PROXIMITY_INFO) {
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LOGI("Index: %d", mProximityCharsArray[startIndex + i]);
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}
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if (mProximityCharsArray[startIndex + i] == KEYCODE_SPACE) {
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return true;
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}
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}
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return false;
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}
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// TODO: Calculate nearby codes here.
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void ProximityInfo::setInputParams(const int* inputCodes, const int inputLength,
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const int* xCoordinates, const int* yCoordinates) {
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mInputCodes = inputCodes;
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mInputXCoordinates = xCoordinates;
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mInputYCoordinates = yCoordinates;
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mTouchPositionCorrectionEnabled =
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HAS_TOUCH_POSITION_CORRECTION_DATA && xCoordinates && yCoordinates;
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mInputLength = inputLength;
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for (int i = 0; i < inputLength; ++i) {
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mPrimaryInputWord[i] = getPrimaryCharAt(i);
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}
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mPrimaryInputWord[inputLength] = 0;
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for (int i = 0; i < mInputLength; ++i) {
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const int *proximityChars = getProximityCharsAt(i);
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for (int j = 0; j < MAX_PROXIMITY_CHARS_SIZE && proximityChars[j] > 0; ++j) {
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const int currentChar = proximityChars[j];
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const int keyIndex = getKeyIndex(currentChar);
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const float squaredDistance = calculateNormalizedSquaredDistance(keyIndex, i);
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if (squaredDistance >= 0.0f) {
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mNormalizedSquaredDistances[i * MAX_PROXIMITY_CHARS_SIZE + j] =
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(int)(squaredDistance * NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR);
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} else {
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mNormalizedSquaredDistances[i * MAX_PROXIMITY_CHARS_SIZE + j] = (j == 0)
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? EQUIVALENT_CHAR_WITHOUT_DISTANCE_INFO
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: PROXIMITY_CHAR_WITHOUT_DISTANCE_INFO;
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}
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}
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}
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}
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inline float square(const float x) { return x * x; }
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float ProximityInfo::calculateNormalizedSquaredDistance(
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const int keyIndex, const int inputIndex) const {
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static const float NOT_A_DISTANCE_FLOAT = -1.0f;
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if (keyIndex == NOT_A_INDEX) {
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return NOT_A_DISTANCE_FLOAT;
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}
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if (!hasSweetSpotData(keyIndex)) {
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return NOT_A_DISTANCE_FLOAT;
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}
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const float squaredDistance = calculateSquaredDistanceFromSweetSpotCenter(keyIndex, inputIndex);
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const float squaredRadius = square(mSweetSpotRadii[keyIndex]);
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return squaredDistance / squaredRadius;
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}
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int ProximityInfo::getKeyIndex(const int c) const {
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if (KEY_COUNT == 0 || !mInputXCoordinates || !mInputYCoordinates) {
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// We do not have the coordinate data
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return NOT_A_INDEX;
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}
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const unsigned short baseLowerC = toBaseLowerCase(c);
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if (baseLowerC > MAX_CHAR_CODE) {
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return NOT_A_INDEX;
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}
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return mCodeToKeyIndex[baseLowerC];
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}
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float ProximityInfo::calculateSquaredDistanceFromSweetSpotCenter(
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const int keyIndex, const int inputIndex) const {
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const float sweetSpotCenterX = mSweetSpotCenterXs[keyIndex];
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const float sweetSpotCenterY = mSweetSpotCenterYs[keyIndex];
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const float inputX = (float)mInputXCoordinates[inputIndex];
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const float inputY = (float)mInputYCoordinates[inputIndex];
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return square(inputX - sweetSpotCenterX) + square(inputY - sweetSpotCenterY);
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}
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inline const int* ProximityInfo::getProximityCharsAt(const int index) const {
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return mInputCodes + (index * MAX_PROXIMITY_CHARS_SIZE);
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}
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unsigned short ProximityInfo::getPrimaryCharAt(const int index) const {
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return getProximityCharsAt(index)[0];
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}
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inline bool ProximityInfo::existsCharInProximityAt(const int index, const int c) const {
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const int *chars = getProximityCharsAt(index);
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int i = 0;
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while (chars[i] > 0 && i < MAX_PROXIMITY_CHARS_SIZE) {
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if (chars[i++] == c) {
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return true;
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}
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}
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return false;
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}
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bool ProximityInfo::existsAdjacentProximityChars(const int index) const {
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if (index < 0 || index >= mInputLength) return false;
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const int currentChar = getPrimaryCharAt(index);
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const int leftIndex = index - 1;
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if (leftIndex >= 0 && existsCharInProximityAt(leftIndex, currentChar)) {
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return true;
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}
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const int rightIndex = index + 1;
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if (rightIndex < mInputLength && existsCharInProximityAt(rightIndex, currentChar)) {
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return true;
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}
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return false;
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}
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// In the following function, c is the current character of the dictionary word
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// currently examined.
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// currentChars is an array containing the keys close to the character the
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// user actually typed at the same position. We want to see if c is in it: if so,
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// then the word contains at that position a character close to what the user
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// typed.
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// What the user typed is actually the first character of the array.
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// proximityIndex is a pointer to the variable where getMatchedProximityId returns
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// the index of c in the proximity chars of the input index.
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// Notice : accented characters do not have a proximity list, so they are alone
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// in their list. The non-accented version of the character should be considered
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// "close", but not the other keys close to the non-accented version.
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ProximityInfo::ProximityType ProximityInfo::getMatchedProximityId(const int index,
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const unsigned short c, const bool checkProximityChars, int *proximityIndex) const {
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const int *currentChars = getProximityCharsAt(index);
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const int firstChar = currentChars[0];
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const unsigned short baseLowerC = toBaseLowerCase(c);
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// The first char in the array is what user typed. If it matches right away,
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// that means the user typed that same char for this pos.
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if (firstChar == baseLowerC || firstChar == c) {
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return EQUIVALENT_CHAR;
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}
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if (!checkProximityChars) return UNRELATED_CHAR;
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// If the non-accented, lowercased version of that first character matches c,
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// then we have a non-accented version of the accented character the user
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// typed. Treat it as a close char.
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if (toBaseLowerCase(firstChar) == baseLowerC)
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return NEAR_PROXIMITY_CHAR;
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// Not an exact nor an accent-alike match: search the list of close keys
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int j = 1;
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while (j < MAX_PROXIMITY_CHARS_SIZE && currentChars[j] > 0) {
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const bool matched = (currentChars[j] == baseLowerC || currentChars[j] == c);
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if (matched) {
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if (proximityIndex) {
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*proximityIndex = j;
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}
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return NEAR_PROXIMITY_CHAR;
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}
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++j;
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}
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// Was not included, signal this as an unrelated character.
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return UNRELATED_CHAR;
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}
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bool ProximityInfo::sameAsTyped(const unsigned short *word, int length) const {
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if (length != mInputLength) {
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return false;
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}
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const int *inputCodes = mInputCodes;
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while (length--) {
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if ((unsigned int) *inputCodes != (unsigned int) *word) {
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return false;
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}
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inputCodes += MAX_PROXIMITY_CHARS_SIZE;
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word++;
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}
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return true;
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}
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const int ProximityInfo::NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR_LOG_2;
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const int ProximityInfo::NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR;
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const int ProximityInfo::MAX_KEY_COUNT_IN_A_KEYBOARD;
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const int ProximityInfo::MAX_CHAR_CODE;
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} // namespace latinime
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