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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.
*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
#define LOG_TAG "LatinIME: proximity_info.cpp"
#include "defines_touch_position_correction.h"
#include "dictionary.h"
#include "proximity_info.h"
namespace latinime {
inline void copyOrFillZero(void *to, const void *from, size_t size) {
if (from) {
memcpy(to, from, size);
} else {
memset(to, 0, size);
}
}
ProximityInfo::ProximityInfo(const int maxProximityCharsSize, const int keyboardWidth,
const int keyboardHeight, 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)
: MAX_PROXIMITY_CHARS_SIZE(maxProximityCharsSize), KEYBOARD_WIDTH(keyboardWidth),
KEYBOARD_HEIGHT(keyboardHeight), GRID_WIDTH(gridWidth), GRID_HEIGHT(gridHeight),
CELL_WIDTH((keyboardWidth + gridWidth - 1) / gridWidth),
CELL_HEIGHT((keyboardHeight + gridHeight - 1) / gridHeight),
KEY_COUNT(min(keyCount, MAX_KEY_COUNT_IN_A_KEYBOARD)) {
const int len = GRID_WIDTH * GRID_HEIGHT * MAX_PROXIMITY_CHARS_SIZE;
mProximityCharsArray = new uint32_t[len];
if (DEBUG_PROXIMITY_INFO) {
LOGI("Create proximity info array %d", len);
}
memcpy(mProximityCharsArray, proximityCharsArray, len * sizeof(mProximityCharsArray[0]));
copyOrFillZero(mKeyXCoordinates, keyXCoordinates, KEY_COUNT * sizeof(mKeyXCoordinates[0]));
copyOrFillZero(mKeyYCoordinates, keyYCoordinates, KEY_COUNT * sizeof(mKeyYCoordinates[0]));
copyOrFillZero(mKeyWidths, keyWidths, KEY_COUNT * sizeof(mKeyWidths[0]));
copyOrFillZero(mKeyHeights, keyHeights, KEY_COUNT * sizeof(mKeyHeights[0]));
copyOrFillZero(mKeyCharCodes, keyCharCodes, KEY_COUNT * sizeof(mKeyCharCodes[0]));
initializeCodeToGroup();
initializeCodeToKeyIndex();
}
// Build the reversed look up table from the char code to the index in its group.
// see TOUCH_POSITION_CORRECTION_GROUPS
void ProximityInfo::initializeCodeToGroup() {
memset(mCodeToGroup, -1, (MAX_GROUPED_CHAR_CODE + 1) * sizeof(mCodeToGroup[0]));
for (int i = 0; i < CORRECTION_GROUP_COUNT; ++i) {
const char *group = TOUCH_POSITION_CORRECTION_GROUPS[i];
for (int j = 0; group[j]; ++j) {
const int code = group[j];
if (0 <= code && code <= MAX_GROUPED_CHAR_CODE)
mCodeToGroup[code] = i;
}
}
}
// Build the reversed look up table from the char code to the index in mKeyXCoordinates,
// mKeyYCoordinates, mKeyWidths, mKeyHeights, mKeyCharCodes.
void ProximityInfo::initializeCodeToKeyIndex() {
memset(mCodeToKeyIndex, -1, (MAX_GROUPED_CHAR_CODE + 1) * sizeof(mCodeToKeyIndex[0]));
for (int i = 0; i < KEY_COUNT; ++i) {
const int code = mKeyCharCodes[i];
if (0 <= code && code <= MAX_GROUPED_CHAR_CODE)
mCodeToKeyIndex[code] = i;
}
}
ProximityInfo::~ProximityInfo() {
delete[] mProximityCharsArray;
}
inline int ProximityInfo::getStartIndexFromCoordinates(const int x, const int y) const {
return ((y / CELL_HEIGHT) * GRID_WIDTH + (x / CELL_WIDTH))
* MAX_PROXIMITY_CHARS_SIZE;
}
bool ProximityInfo::hasSpaceProximity(const int x, const int y) const {
const int startIndex = getStartIndexFromCoordinates(x, y);
if (DEBUG_PROXIMITY_INFO) {
LOGI("hasSpaceProximity: index %d", startIndex);
}
for (int i = 0; i < MAX_PROXIMITY_CHARS_SIZE; ++i) {
if (DEBUG_PROXIMITY_INFO) {
LOGI("Index: %d", mProximityCharsArray[startIndex + i]);
}
if (mProximityCharsArray[startIndex + i] == KEYCODE_SPACE) {
return true;
}
}
return false;
}
// TODO: Calculate nearby codes here.
void ProximityInfo::setInputParams(const int* inputCodes, const int inputLength) {
mInputCodes = inputCodes;
mInputLength = inputLength;
for (int i = 0; i < inputLength; ++i) {
mPrimaryInputWord[i] = getPrimaryCharAt(i);
}
mPrimaryInputWord[inputLength] = 0;
}
inline const int* ProximityInfo::getProximityCharsAt(const int index) const {
return mInputCodes + (index * MAX_PROXIMITY_CHARS_SIZE);
}
unsigned short ProximityInfo::getPrimaryCharAt(const int index) const {
return getProximityCharsAt(index)[0];
}
inline bool ProximityInfo::existsCharInProximityAt(const int index, const int c) const {
const int *chars = getProximityCharsAt(index);
int i = 0;
while (chars[i] > 0 && i < MAX_PROXIMITY_CHARS_SIZE) {
if (chars[i++] == c) {
return true;
}
}
return false;
}
bool ProximityInfo::existsAdjacentProximityChars(const int index) const {
if (index < 0 || index >= mInputLength) return false;
const int currentChar = getPrimaryCharAt(index);
const int leftIndex = index - 1;
if (leftIndex >= 0 && existsCharInProximityAt(leftIndex, currentChar)) {
return true;
}
const int rightIndex = index + 1;
if (rightIndex < mInputLength && existsCharInProximityAt(rightIndex, currentChar)) {
return true;
}
return false;
}
// In the following function, c is the current character of the dictionary word
// currently examined.
// currentChars is an array containing the keys close to the character the
// user actually typed at the same position. We want to see if c is in it: if so,
// then the word contains at that position a character close to what the user
// typed.
// What the user typed is actually the first character of the array.
// Notice : accented characters do not have a proximity list, so they are alone
// in their list. The non-accented version of the character should be considered
// "close", but not the other keys close to the non-accented version.
ProximityInfo::ProximityType ProximityInfo::getMatchedProximityId(
const int index, const unsigned short c, const bool checkProximityChars) const {
const int *currentChars = getProximityCharsAt(index);
const unsigned short baseLowerC = Dictionary::toBaseLowerCase(c);
// The first char in the array is what user typed. If it matches right away,
// that means the user typed that same char for this pos.
if (currentChars[0] == baseLowerC || currentChars[0] == c)
return SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR;
if (!checkProximityChars) return UNRELATED_CHAR;
// If the non-accented, lowercased version of that first character matches c,
// then we have a non-accented version of the accented character the user
// typed. Treat it as a close char.
if (Dictionary::toBaseLowerCase(currentChars[0]) == baseLowerC)
return NEAR_PROXIMITY_CHAR;
// Not an exact nor an accent-alike match: search the list of close keys
int j = 1;
while (currentChars[j] > 0 && j < MAX_PROXIMITY_CHARS_SIZE) {
const bool matched = (currentChars[j] == baseLowerC || currentChars[j] == c);
if (matched) return NEAR_PROXIMITY_CHAR;
++j;
}
// Was not included, signal this as an unrelated character.
return UNRELATED_CHAR;
}
bool ProximityInfo::sameAsTyped(const unsigned short *word, int length) const {
if (length != mInputLength) {
return false;
}
const int *inputCodes = mInputCodes;
while (length--) {
if ((unsigned int) *inputCodes != (unsigned int) *word) {
return false;
}
inputCodes += MAX_PROXIMITY_CHARS_SIZE;
word++;
}
return true;
}
const int ProximityInfo::MAX_KEY_COUNT_IN_A_KEYBOARD;
const int ProximityInfo::MAX_GROUPED_CHAR_CODE;
} // namespace latinime
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