Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/cjkpitch.h @ 2:b50eed0cc0ef upstream

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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
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: cjkpitch.h
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3 // Description: Code to determine fixed pitchness and the pitch if fixed,
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4 // for CJK text.
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5 // Copyright 2011 Google Inc. All Rights Reserved.
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6 // Author: takenaka@google.com (Hiroshi Takenaka)
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7 // Created: Mon Jun 27 12:48:35 JST 2011
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8 //
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9 // Licensed under the Apache License, Version 2.0 (the "License");
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10 // you may not use this file except in compliance with the License.
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11 // You may obtain a copy of the License at
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12 // http://www.apache.org/licenses/LICENSE-2.0
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13 // Unless required by applicable law or agreed to in writing, software
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14 // distributed under the License is distributed on an "AS IS" BASIS,
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15 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 // See the License for the specific language governing permissions and
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17 // limitations under the License.
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18 //
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19 ///////////////////////////////////////////////////////////////////////
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20 #ifndef CJKPITCH_H_
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21 #define CJKPITCH_H_
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23 #include "blobbox.h"
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25 namespace tesseract {
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27 // Function to test "fixed-pitchness" of the input text and estimating
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28 // character pitch parameters for it, based on CJK fixed-pitch layout
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29 // model.
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30 //
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31 // This function assumes that a fixed-pitch CJK text has following
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32 // characteristics:
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33 //
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34 // - Most glyphs are designed to fit within the same sized square
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35 // (imaginary body). Also they are aligned to the center of their
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36 // imaginary bodies.
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37 // - The imaginary body is always a regular rectangle.
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38 // - There may be some extra space between character bodies
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39 // (tracking).
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40 // - There may be some extra space after punctuations.
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41 // - The text is *not* space-delimited. Thus spaces are rare.
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42 // - Character may consists of multiple unconnected blobs.
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43 //
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44 // And the function works in two passes. On pass 1, it looks for such
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45 // "good" blobs that has the pitch same pitch on the both side and
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46 // looks like a complete CJK character. Then estimates the character
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47 // pitch for every row, based on those good blobs. If we couldn't find
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48 // enough good blobs for a row, then the pitch is estimated from other
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49 // rows with similar character height instead.
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50 //
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51 // Pass 2 is an iterative process to fit the blobs into fixed-pitch
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52 // character cells. Once we have estimated the character pitch, blobs
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53 // that are almost as large as the pitch can be considered to be
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54 // complete characters. And once we know that some characters are
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55 // complete characters, we can estimate the region occupied by its
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56 // neighbors. And so on.
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57 //
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58 // We repeat the process until all ambiguities are resolved. Then make
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59 // the final decision about fixed-pitchness of each row and compute
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60 // pitch and spacing parameters.
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61 //
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62 // (If a row is considered to be proportional, pitch_decision for the
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63 // row is set to PITCH_CORR_PROP and the later phase
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64 // (i.e. Textord::to_spacing()) should determine its spacing
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65 // parameters)
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66 //
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67 // This function doesn't provide all information required by
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68 // fixed_pitch_words() and the rows need to be processed with
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69 // make_prop_words() even if they are fixed pitched.
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70 void compute_fixed_pitch_cjk(ICOORD page_tr, // top right
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71 TO_BLOCK_LIST *port_blocks); // input list
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72
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73 } // namespace tesseract
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74
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75 #endif // CJKPITCH_H_