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Libjpeg-turbo update to version 3.0.3 #25623 ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [ ] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMake
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*
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* cmyk.h
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*
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* Copyright (C) 2017-2018, 2022, D. R. Commander.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*
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* This file contains convenience functions for performing quick & dirty
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* CMYK<->RGB conversion. This algorithm is suitable for testing purposes
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* only. Properly converting between CMYK and RGB requires a color management
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* system.
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*/
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#ifndef CMYK_H
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#define CMYK_H
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#include <jinclude.h>
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#define JPEG_INTERNALS
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#include <jpeglib.h>
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#include "jsamplecomp.h"
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/* Fully reversible */
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INLINE
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LOCAL(void)
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rgb_to_cmyk(_JSAMPLE r, _JSAMPLE g, _JSAMPLE b,
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_JSAMPLE *c, _JSAMPLE *m, _JSAMPLE *y, _JSAMPLE *k)
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{
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double ctmp = 1.0 - ((double)r / (double)_MAXJSAMPLE);
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double mtmp = 1.0 - ((double)g / (double)_MAXJSAMPLE);
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double ytmp = 1.0 - ((double)b / (double)_MAXJSAMPLE);
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double ktmp = MIN(MIN(ctmp, mtmp), ytmp);
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if (ktmp == 1.0) ctmp = mtmp = ytmp = 0.0;
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else {
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ctmp = (ctmp - ktmp) / (1.0 - ktmp);
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mtmp = (mtmp - ktmp) / (1.0 - ktmp);
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ytmp = (ytmp - ktmp) / (1.0 - ktmp);
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}
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*c = (_JSAMPLE)((double)_MAXJSAMPLE - ctmp * (double)_MAXJSAMPLE + 0.5);
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*m = (_JSAMPLE)((double)_MAXJSAMPLE - mtmp * (double)_MAXJSAMPLE + 0.5);
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*y = (_JSAMPLE)((double)_MAXJSAMPLE - ytmp * (double)_MAXJSAMPLE + 0.5);
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*k = (_JSAMPLE)((double)_MAXJSAMPLE - ktmp * (double)_MAXJSAMPLE + 0.5);
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}
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/* Fully reversible only for C/M/Y/K values generated with rgb_to_cmyk() */
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INLINE
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LOCAL(void)
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cmyk_to_rgb(_JSAMPLE c, _JSAMPLE m, _JSAMPLE y, _JSAMPLE k,
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_JSAMPLE *r, _JSAMPLE *g, _JSAMPLE *b)
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{
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*r = (_JSAMPLE)((double)c * (double)k / (double)_MAXJSAMPLE + 0.5);
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*g = (_JSAMPLE)((double)m * (double)k / (double)_MAXJSAMPLE + 0.5);
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*b = (_JSAMPLE)((double)y * (double)k / (double)_MAXJSAMPLE + 0.5);
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}
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#endif /* CMYK_H */
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