Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/lcms2/utils/samples/itufax.c @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 //
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2 // Little cms
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3 // Copyright (C) 1998-2003 Marti Maria
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4 //
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5 // Permission is hereby granted, free of charge, to any person obtaining
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6 // a copy of this software and associated documentation files (the "Software"),
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7 // to deal in the Software without restriction, including without limitation
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8 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
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9 // and/or sell copies of the Software, and to permit persons to whom the Software
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10 // is furnished to do so, subject to the following conditions:
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11 //
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12 // The above copyright notice and this permission notice shall be included in
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13 // all copies or substantial portions of the Software.
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14 //
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15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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17 // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24 #include "lcms.h"
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26 // This is a sample on how to build a profile for decoding ITU T.42/Fax JPEG
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27 // streams. The profile has an additional ability in the input direction of
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28 // gamut compress values between 85 < a < -85 and -75 < b < 125. This conforms
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29 // the default range for ITU/T.42 -- See RFC 2301, section 6.2.3 for details
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32 // L* = [0, 100]
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33 // a* = [-85, 85]
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34 // b* = [-75, 125]
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37 // These functions does convert the encoding of ITUFAX to floating point
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39 static
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40 void ITU2Lab(WORD In[3], LPcmsCIELab Lab)
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41 {
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42 Lab -> L = (double) In[0] / 655.35;
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43 Lab -> a = (double) 170.* (In[1] - 32768.) / 65535.;
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44 Lab -> b = (double) 200.* (In[2] - 24576.) / 65535.;
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45 }
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48 static
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49 void Lab2ITU(LPcmsCIELab Lab, WORD Out[3])
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50 {
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51 Out[0] = (WORD) floor((double) (Lab -> L / 100.)* 65535. + 0.5);
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52 Out[1] = (WORD) floor((double) (Lab -> a / 170.)* 65535. + 32768. + 0.5);
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53 Out[2] = (WORD) floor((double) (Lab -> b / 200.)* 65535. + 24576. + 0.5);
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54 }
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57 // These are the samplers-- They are passed as callbacks to cmsSample3DGrid()
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58 // then, cmsSample3DGrid() will sweel whole Lab gamut calling these functions
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59 // once for each node. In[] will contain the Lab PCS value to convert to ITUFAX
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60 // on InputDirection, or the ITUFAX value to convert to Lab in OutputDirection
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61 // You can change the number of sample points if desired, the algorithm will
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62 // remain same. 33 points gives good accuracy, but you can reduce to 22 or less
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63 // is space is critical
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65 #define GRID_POINTS 33
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67 static
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68 int InputDirection(register WORD In[], register WORD Out[], register LPVOID Cargo)
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69 {
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70 cmsCIELab Lab;
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72 cmsLabEncoded2Float(&Lab, In);
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73 cmsClampLab(&Lab, 85, -85, 125, -75); // This function does the necessary gamut remapping
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74 Lab2ITU(&Lab, Out);
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75
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76 return TRUE;
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77 }
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80 static
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81 int OutputDirection(register WORD In[], register WORD Out[], register LPVOID Cargo)
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82 {
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84 cmsCIELab Lab;
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86 ITU2Lab(In, &Lab);
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87 cmsFloat2LabEncoded(Out, &Lab);
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89 return TRUE;
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90 }
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93 // The main entry point. Just create a profile an populate it with required tags.
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94 // note that cmsOpenProfileFromFile("itufax.icm", "w") will NOT delete the file
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95 // if already exists. This is for obvious safety reasons.
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98 int main(int argc, char *argv[])
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99 {
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100 LPLUT AToB0, BToA0;
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101 cmsHPROFILE hProfile;
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102
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103 fprintf(stderr, "Creating itufax.icm...");
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104
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105 unlink("itufax.icm");
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106 hProfile = cmsOpenProfileFromFile("itufax.icm", "w");
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107
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108 AToB0 = cmsAllocLUT();
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109 BToA0 = cmsAllocLUT();
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110
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111 cmsAlloc3DGrid(AToB0, GRID_POINTS, 3, 3);
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112 cmsAlloc3DGrid(BToA0, GRID_POINTS, 3, 3);
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113
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114 cmsSample3DGrid(AToB0, InputDirection, NULL, 0);
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115 cmsSample3DGrid(BToA0, OutputDirection, NULL, 0);
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116
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117 cmsAddTag(hProfile, icSigAToB0Tag, AToB0);
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118 cmsAddTag(hProfile, icSigBToA0Tag, BToA0);
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119
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120
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121 cmsSetColorSpace(hProfile, icSigLabData);
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122 cmsSetPCS(hProfile, icSigLabData);
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123 cmsSetDeviceClass(hProfile, icSigColorSpaceClass);
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124
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125 cmsAddTag(hProfile, icSigProfileDescriptionTag, "ITU T.42/Fax JPEG CIEL*a*b*");
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126 cmsAddTag(hProfile, icSigCopyrightTag, "No Copyright, use freely.");
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127 cmsAddTag(hProfile, icSigDeviceMfgDescTag, "Little cms");
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128 cmsAddTag(hProfile, icSigDeviceModelDescTag, "ITU T.42/Fax JPEG CIEL*a*b*");
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129
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130 cmsCloseProfile(hProfile);
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131
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132 cmsFreeLUT(AToB0);
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133 cmsFreeLUT(BToA0);
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134
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135 fprintf(stderr, "Done.\n");
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136
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137 return 0;
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138 }