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71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
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/**********************************************************************
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* File: char_altlist.h
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* Description: Declaration of a Character Alternate List Class
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* Author: Ahmad Abdulkader
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* Created: 2007
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*
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* (C) Copyright 2008, Google Inc.
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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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** http://www.apache.org/licenses/LICENSE-2.0
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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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**********************************************************************/
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#ifndef CHAR_ALT_LIST_H
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#define CHAR_ALT_LIST_H
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// The CharAltList class holds the list of class alternates returned from
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// a character classifier. Each alternate represents a class ID.
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// It inherits from the AltList class.
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// The CharAltList owns a CharSet object that maps a class-id to a string.
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#include "altlist.h"
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#include "char_set.h"
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namespace tesseract {
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class CharAltList : public AltList {
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public:
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CharAltList(const CharSet *char_set, int max_alt = kMaxCharAlt);
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~CharAltList();
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// Sort the alternate list based on cost
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void Sort();
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// insert a new alternate with the specified class-id, cost and tag
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bool Insert(int class_id, int cost, void *tag = NULL);
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// returns the cost of a specific class ID
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inline int ClassCost(int class_id) const {
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if (class_id_cost_ == NULL ||
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class_id < 0 ||
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class_id >= char_set_->ClassCount()) {
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return WORST_COST;
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}
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return class_id_cost_[class_id];
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}
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// returns the alternate class-id corresponding to an alternate index
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inline int Alt(int alt_idx) const { return class_id_alt_[alt_idx]; }
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// set the cost of a certain alternate
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void SetAltCost(int alt_idx, int cost) {
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alt_cost_[alt_idx] = cost;
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class_id_cost_[class_id_alt_[alt_idx]] = cost;
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}
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private:
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// character set object. Passed at construction time
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const CharSet *char_set_;
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// array of alternate class-ids
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int *class_id_alt_;
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// array of alternate costs
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int *class_id_cost_;
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// default max count of alternates
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static const int kMaxCharAlt = 256;
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};
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}
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#endif // CHAR_ALT_LIST_H
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