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comparison mupdf-source/thirdparty/tesseract/src/ccstruct/quadratc.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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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /**********************************************************************
2 * File: quadratc.h (Formerly quadrtic.h)
3 * Description: Code for the QUAD_COEFFS class.
4 * Author: Ray Smith
5 * Created: Tue Oct 08 17:24:40 BST 1991
6 *
7 * (C) Copyright 1991, Hewlett-Packard Ltd.
8 ** Licensed under the Apache License, Version 2.0 (the "License");
9 ** you may not use this file except in compliance with the License.
10 ** You may obtain a copy of the License at
11 ** http://www.apache.org/licenses/LICENSE-2.0
12 ** Unless required by applicable law or agreed to in writing, software
13 ** distributed under the License is distributed on an "AS IS" BASIS,
14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 ** See the License for the specific language governing permissions and
16 ** limitations under the License.
17 *
18 **********************************************************************/
19
20 #ifndef QUADRATC_H
21 #define QUADRATC_H
22
23 #include "points.h"
24
25 namespace tesseract {
26
27 class QUAD_COEFFS {
28 public:
29 QUAD_COEFFS() = default;
30 QUAD_COEFFS( // constructor
31 double xsq, // coefficients
32 float x, float constant) {
33 a = xsq;
34 b = x;
35 c = constant;
36 }
37
38 float y( // evaluate
39 float x) const { // at x
40 return static_cast<float>((a * x + b) * x + c);
41 }
42
43 void move( // reposition word
44 ICOORD vec) { // by vector
45 /************************************************************
46 y - q = a (x - p)^2 + b (x - p) + c
47 y - q = ax^2 - 2apx + ap^2 + bx - bp + c
48 y = ax^2 + (b - 2ap)x + (c - bp + ap^2 + q)
49 ************************************************************/
50 int16_t p = vec.x();
51 int16_t q = vec.y();
52
53 c = static_cast<float>(c - b * p + a * p * p + q);
54 b = static_cast<float>(b - 2 * a * p);
55 }
56
57 double a; // x squared
58 float b; // x
59 float c; // constant
60 private:
61 };
62
63 } // namespace tesseract
64
65 #endif