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comparison mupdf-source/thirdparty/lcms2/utils/samples/roundtrip.c @ 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 // Little cms
3 // Copyright (C) 1998-2011 Marti Maria
4 //
5 // Permission is hereby granted, free of charge, to any person obtaining
6 // a copy of this software and associated documentation files (the "Software"),
7 // to deal in the Software without restriction, including without limitation
8 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 // and/or sell copies of the Software, and to permit persons to whom the Software
10 // is furnished to do so, subject to the following conditions:
11 //
12 // The above copyright notice and this permission notice shall be included in
13 // all copies or substantial portions of the Software.
14 //
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
17 // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21
22 #include "lcms2mt.h"
23 #include <math.h>
24
25
26
27 static
28 double VecDist(cmsUInt8Number bin[3], cmsUInt8Number bout[3])
29 {
30 double rdist, gdist, bdist;
31
32 rdist = fabs((double) bout[0] - bin[0]);
33 gdist = fabs((double) bout[1] - bin[1]);
34 bdist = fabs((double) bout[2] - bin[2]);
35
36 return (sqrt((rdist*rdist + gdist*gdist + bdist*bdist)));
37 }
38
39
40 int main(int argc, char* argv[])
41 {
42
43 int r, g, b;
44 cmsUInt8Number RGB[3], RGB_OUT[3];
45 cmsHTRANSFORM xform;
46 cmsHPROFILE hProfile;
47 double err, SumX=0, SumX2=0, Peak = 0, n = 0;
48
49
50 if (argc != 2) {
51 printf("roundtrip <RGB icc profile>\n");
52 return 1;
53 }
54
55 hProfile = cmsOpenProfileFromFile(argv[1], "r");
56 if (hProfile == NULL)
57 {
58 printf("invalid profile\n");
59 return 1;
60 }
61
62 xform = cmsCreateTransform(hProfile,TYPE_RGB_8, hProfile, TYPE_RGB_8, INTENT_RELATIVE_COLORIMETRIC, cmsFLAGS_NOOPTIMIZE);
63 if (xform == NULL)
64 {
65 printf("Not a valid RGB profile\n");
66 return 1;
67 }
68
69 for (r=0; r< 256; r++) {
70 printf("%d \r", r);
71 for (g=0; g < 256; g++) {
72 for (b=0; b < 256; b++) {
73
74 RGB[0] = r;
75 RGB[1] = g;
76 RGB[2] = b;
77
78 cmsDoTransform(xform, RGB, RGB_OUT, 1);
79
80 err = VecDist(RGB, RGB_OUT);
81
82 SumX += err;
83 SumX2 += err * err;
84 n += 1.0;
85 if (err > Peak)
86 Peak = err;
87
88 }
89 }
90 }
91
92 printf("Average %g\n", SumX / n);
93 printf("Max %g\n", Peak);
94 printf("Std %g\n", sqrt((n*SumX2 - SumX * SumX) / (n*(n-1))));
95 cmsCloseProfile(hProfile);
96 cmsDeleteTransform(xform);
97
98 return 0;
99 }