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comparison mupdf-source/thirdparty/tesseract/src/classify/mf.cpp @ 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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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /******************************************************************************
2 ** Filename: mf.c
3 ** Purpose: Micro-feature interface to flexible feature extractor.
4 ** Author: Dan Johnson
5 **
6 ** (c) Copyright Hewlett-Packard Company, 1988.
7 ** Licensed under the Apache License, Version 2.0 (the "License");
8 ** you may not use this file except in compliance with the License.
9 ** You may obtain a copy of the License at
10 ** http://www.apache.org/licenses/LICENSE-2.0
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 ******************************************************************************/
17 /*----------------------------------------------------------------------------
18 Include Files and Type Defines
19 ----------------------------------------------------------------------------*/
20 #include "mf.h"
21
22 #include "featdefs.h"
23 #include "mfdefs.h"
24 #include "mfx.h"
25
26 #include <cmath>
27
28 namespace tesseract {
29
30 /*----------------------------------------------------------------------------
31 Private Code
32 ----------------------------------------------------------------------------*/
33 /**
34 * Call the old micro-feature extractor and then copy
35 * the features into the new format. Then deallocate the
36 * old micro-features.
37 * @param Blob blob to extract micro-features from
38 * @param cn_denorm control parameter to feature extractor.
39 * @return Micro-features for Blob.
40 */
41 FEATURE_SET ExtractMicros(TBLOB *Blob, const DENORM &cn_denorm) {
42 auto features = BlobMicroFeatures(Blob, cn_denorm);
43 if (features.empty()) {
44 return nullptr;
45 }
46 int n = 0;
47 for ([[maybe_unused]] auto &f: features) {
48 ++n;
49 }
50 auto FeatureSet = new FEATURE_SET_STRUCT(n);
51
52 for (auto &f : features) {
53 auto Feature = new FEATURE_STRUCT(&MicroFeatureDesc);
54 for (int i = 0; i < (int)MicroFeatureParameter::MFCount; ++i)
55 Feature->Params[i] = f[i];
56 // Bulge features are deprecated and should not be used. Set to 0.
57 Feature->Params[(int)MicroFeatureParameter::MFBulge1] = 0.0f;
58 Feature->Params[(int)MicroFeatureParameter::MFBulge2] = 0.0f;
59
60 #ifndef _WIN32
61 // Assert that feature parameters are well defined.
62 for (int i = 0; i < Feature->Type->NumParams; i++) {
63 ASSERT_HOST(!std::isnan(Feature->Params[i]));
64 }
65 #endif
66
67 AddFeature(FeatureSet, Feature);
68 }
69 return FeatureSet;
70 } /* ExtractMicros */
71
72 } // namespace tesseract