forked from CGM_Public/pretix_original
f0a06cd9fe
* Replace SCSS compilation with CSS variables * Update tests * Update src/pretix/presale/style.py Co-authored-by: Mira <weller@rami.io> * Update src/pretix/presale/context.py Co-authored-by: Mira <weller@rami.io> * Update src/pretix/presale/views/widget.py Co-authored-by: Mira <weller@rami.io> * Update src/pretix/presale/context.py Co-authored-by: Mira <weller@rami.io> * Update src/pretix/static/pretixbase/scss/_variables.scss Co-authored-by: Richard Schreiber <schreiber@rami.io> * Last minor changes * Rename file --------- Co-authored-by: Mira <weller@rami.io> Co-authored-by: Richard Schreiber <schreiber@rami.io>
323 lines
7.7 KiB
SCSS
323 lines
7.7 KiB
SCSS
// https://medium.com/dev-channel/using-sass-to-automatically-pick-text-colors-4ba7645d2796
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//
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// Copyright 2017 Google Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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// Precomputed linear color channel values, for use in contrast calculations.
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// See https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
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//
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// Algorithm, for c in 0 to 255:
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// f(c) {
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// c = c / 255;
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// return c < 0.03928 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
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// }
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//
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// This lookup table is needed since there is no `pow` in SASS.
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$linear-channel-values:
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0
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.0003035269835488375
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.000607053967097675
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.0009105809506465125
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.00121410793419535
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.0015176349177441874
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.001821161901293025
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.0021246888848418626
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.0024282158683907
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.0027317428519395373
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.003035269835488375
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.003346535763899161
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.003676507324047436
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.004024717018496307
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.004391442037410293
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.004776953480693729
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.005181516702338386
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.005605391624202723
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.006048833022857054
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.006512090792594475
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.006995410187265387
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.007499032043226175
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.008023192985384994
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.008568125618069307
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.009134058702220787
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.00972121732023785
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.010329823029626936
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.010960094006488246
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.011612245179743885
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.012286488356915872
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.012983032342173012
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.013702083047289686
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.014443843596092545
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.01520851442291271
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.01599629336550963
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.016807375752887384
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.017641954488384078
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.018500220128379697
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.019382360956935723
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.0202885630566524
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.021219010376003555
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.022173884793387385
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.02315336617811041
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.024157632448504756
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.02518685962736163
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.026241221894849898
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.027320891639074894
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.028426039504420793
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.0295568344378088
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.030713443732993635
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.03189603307301153
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.033104766570885055
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.03433980680868217
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.03560131487502034
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.03688945040110004
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.0382043715953465
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.03954623527673284
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.04091519690685319
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.042311410620809675
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.043735029256973465
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.04518620438567554
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.046665086336880095
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.04817182422688942
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.04970656598412723
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.05126945837404324
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.052860647023180246
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.05448027644244237
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.05612849004960009
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.05780543019106723
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.0595112381629812
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.06124605423161761
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.06301001765316767
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.06480326669290577
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.06662593864377289
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.06847816984440017
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.07036009569659588
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.07227185068231748
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.07421356838014963
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.07618538148130785
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.07818742180518633
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.08021982031446832
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.0822827071298148
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.08437621154414882
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.08650046203654976
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.08865558628577294
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.09084171118340768
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.09305896284668745
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.0953074666309647
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.09758734714186246
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.09989872824711389
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.10224173308810132
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.10461648409110419
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.10702310297826761
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.10946171077829933
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.1119324278369056
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.11443537382697373
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.11697066775851084
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.11953842798834562
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.12213877222960187
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.12477181756095049
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.12743768043564743
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.1301364766903643
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.13286832155381798
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.13563332965520566
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.13843161503245183
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.14126329114027164
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.14412847085805777
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.14702726649759498
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.14995978981060856
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.15292615199615017
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.1559264637078274
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.1589608350608804
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.162029375639111
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.1651321945016676
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.16826940018969075
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.1714411007328226
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.17464740365558504
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.17788841598362912
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.18116424424986022
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.184474994500441
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.18782077230067787
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.19120168274079138
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.1946178304415758
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.19806931955994886
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.20155625379439707
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.20507873639031693
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.20863687014525575
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.21223075741405523
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.21586050011389926
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.2195261997292692
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.2232279573168085
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.22696587351009836
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.23074004852434915
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.23455058216100522
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.238397573812271
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.24228112246555486
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.24620132670783548
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.25015828472995344
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.25415209433082675
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.2581828529215958
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.26225065752969623
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.26635560480286247
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.2704977910130658
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.27467731206038465
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.2788942634768104
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.2831487404299921
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.2874408377269175
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.29177064981753587
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.2961382707983211
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.3005437944157765
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.3049873140698863
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.30946892281750854
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.31398871337571754
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.31854677812509186
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.32314320911295075
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.3277780980565422
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.33245153634617935
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.33716361504833037
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.3419144249086609
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.3467040563550296
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.35153259950043936
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.3564001441459435
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.3613067797835095
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.3662525955988395
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.3712376804741491
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.3762621229909065
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.38132601143253014
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.386429433787049
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.39157247774972326
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.39675523072562685
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.4019777798321958
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.4072402119017367
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.41254261348390375
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.4178850708481375
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.4232676699860717
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.4286904966139066
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.43415363617474895
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.4396571738409188
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.44520119451622786
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.45078578283822346
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.45641102318040466
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.4620769996544071
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.467783796112159
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.47353149614800955
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.4793201831008268
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.4851499400560704
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.4910208498478356
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.4969329950608704
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.5028864580325687
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.5088813208549338
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.5149176653765214
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.5209955732043543
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.5271151257058131
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.5332764040105052
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.5394794890121072
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.5457244613701866
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.5520114015120001
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.5583403896342679
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.5647115057049292
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.5711248294648731
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.5775804404296506
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.5840784178911641
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.5906188409193369
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.5972017883637634
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.6038273388553378
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.6104955708078648
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.6172065624196511
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.6307571363461468
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.6375968739940326
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.6444796819705821
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.6514056374198242
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.6583748172794485
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.665387298282272
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.6866853124353135
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.6938717612919899
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.7083757798916868
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.7156935005064807
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.7230551289219693
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.7454042095403874
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.7529422167760779
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.768151147247507
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.7758222183174236
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.7835377915261935
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.7912979403326302
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.799102738014409
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.8069522576692516
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.8148465722161012
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.8227857543962835
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.8307698767746546
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.83879901174074
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.846873231509858
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.8549926081242338
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.8631572134541023
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.8713671191987972
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.8796223968878317
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.8879231178819663
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.8962693533742664
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.9130986517934192
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.9215818562772946
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.9301108583754237
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.9734452903984125
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.9822505503331171
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.9911020971138298
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1;
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// Calculate the luminance for a color.
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// See https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
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@function luminance($color) {
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$red: nth($linear-channel-values, red($color) + 1);
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$green: nth($linear-channel-values, green($color) + 1);
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$blue: nth($linear-channel-values, blue($color) + 1);
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@return .2126 * $red + .7152 * $green + .0722 * $blue;
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}
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// Calculate the contrast ratio between two colors.
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// See https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
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@function contrast($back, $front) {
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$backLum: luminance($back) + .05;
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$foreLum: luminance($front) + .05;
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@return max($backLum, $foreLum) / min($backLum, $foreLum);
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}
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// Determine whether to use dark or light text on top of given color.
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// Returns black for dark text and white for light text.
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@function choose-contrast-color($color, $l, $d) {
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$lightContrast: contrast($color, $l);
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$darkContrast: contrast($color, $d);
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@if ($lightContrast > $darkContrast) {
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@return $l;
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}
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@else {
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@return $d;
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}
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} |