Mercurial > hgrepos > Python2 > PyMuPDF

comparison mupdf-source/thirdparty/tesseract/src/training/pango/ligature_table.h @ 2:b50eed0cc0ef upstream

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
parents
children
comparison
equal deleted inserted replaced
1:1d09e1dec1d9 2:b50eed0cc0ef
1 /**********************************************************************
2 * File: ligature_table.h
3 * Description: Class for adding and removing optional latin ligatures,
4 * conditional on codepoint support by a specified font
5 * (if specified).
6 * Author: Ranjith Unnikrishnan
7 * Created: Mon Nov 18 2013
8 *
9 * (C) Copyright 2013, Google Inc.
10 * Licensed under the Apache License, Version 2.0 (the "License");
11 * you may not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
13 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 *
20 **********************************************************************/
21
22 #ifndef TRAININGDATA_LIGATURE_TABLE_H_
23 #define TRAININGDATA_LIGATURE_TABLE_H_
24
25 #include "export.h"
26
27 #include <memory>
28 #include <string>
29 #include <unordered_map>
30
31 namespace tesseract {
32
33 class PangoFontInfo; // defined in pango_font_info.h
34
35 // Map to substitute strings for ligatures.
36 using LigHash = std::unordered_map<std::string, std::string>;
37
38 class TESS_PANGO_TRAINING_API LigatureTable {
39 public:
40 // Get a static instance of this class.
41 static LigatureTable *Get();
42
43 // Convert the utf8 string so that ligaturizable sequences, such as "fi" get
44 // replaced by the (utf8 code for) appropriate ligature characters. Only do so
45 // if the corresponding ligature character is renderable in the current font.
46 std::string AddLigatures(const std::string &str, const PangoFontInfo *font) const;
47 // Remove all ligatures.
48 std::string RemoveLigatures(const std::string &str) const;
49 // Remove only custom ligatures (eg. "ct") encoded in the private-use-area.
50 std::string RemoveCustomLigatures(const std::string &str) const;
51
52 const LigHash &norm_to_lig_table() const {
53 return norm_to_lig_table_;
54 }
55 const LigHash &lig_to_norm_table() const {
56 return lig_to_norm_table_;
57 }
58
59 protected:
60 LigatureTable();
61 // Initialize the hash tables mapping between ligature strings and the
62 // corresponding ligature characters.
63 void Init();
64
65 static std::unique_ptr<LigatureTable> instance_;
66 LigHash norm_to_lig_table_;
67 LigHash lig_to_norm_table_;
68 int min_lig_length_;
69 int max_lig_length_;
70 int min_norm_length_;
71 int max_norm_length_;
72
73 private:
74 LigatureTable(const LigatureTable &) = delete;
75 void operator=(const LigatureTable &) = delete;
76 };
77
78 } // namespace tesseract
79
80 #endif // OCR_TRAININGDATA_TYPESETTING_LIGATURE_TABLE_H_