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-rw-r--r--src/_apca.scss164
1 files changed, 82 insertions, 82 deletions
diff --git a/src/_apca.scss b/src/_apca.scss
index c65f46e..c5da4a0 100644
--- a/src/_apca.scss
+++ b/src/_apca.scss
@@ -7,121 +7,121 @@
7@use 'sass:math'; 7@use 'sass:math';
8 8
9$SA98G: ( 9$SA98G: (
10 mainTRC: 2.4, 10 mainTRC: 2.4,
11 11
12 sRco: .2126729, 12 sRco: .2126729,
13 sGco: .7151522, 13 sGco: .7151522,
14 sBco: .072175, 14 sBco: .072175,
15 15
16 normBG: .56, 16 normBG: .56,
17 normTXT: .57, 17 normTXT: .57,
18 revTXT: .62, 18 revTXT: .62,
19 revBG: .65, 19 revBG: .65,
20 20
21 blkThrs: .022, 21 blkThrs: .022,
22 blkClmp: 1.414, 22 blkClmp: 1.414,
23 scaleBoW: 1.14, 23 scaleBoW: 1.14,
24 scaleWoB: 1.14, 24 scaleWoB: 1.14,
25 loBoWoffset: .027, 25 loBoWoffset: .027,
26 loWoBoffset: .027, 26 loWoBoffset: .027,
27 deltaYmin: .0005, 27 deltaYmin: .0005,
28 loClip: .0001, 28 loClip: .0001,
29 29
30 mFactor: 1.9468554433171, 30 mFactor: 1.9468554433171,
31 mOffsetIn: .0387393816571401, 31 mOffsetIn: .0387393816571401,
32 mExpAdj: .283343396420869, 32 mExpAdj: .283343396420869,
33 mOffsetOut: .312865795870758, 33 mOffsetOut: .312865795870758,
34); 34);
35 35
36@function sRGB_to_Y($color) { 36@function sRGB_to_Y($color) {
37 $rgb: color.to-space($color, rgb); 37 $rgb: color.to-space($color, rgb);
38 38
39 @return map.get($SA98G, sRco) * math.pow(math.div(color.channel($rgb, 'red'), 255), map.get($SA98G, mainTRC)) + 39 @return map.get($SA98G, sRco) * math.pow(math.div(color.channel($rgb, 'red'), 255), map.get($SA98G, mainTRC)) +
40 map.get($SA98G, sGco) * math.pow(math.div(color.channel($rgb, 'green'), 255), map.get($SA98G, mainTRC)) + 40 map.get($SA98G, sGco) * math.pow(math.div(color.channel($rgb, 'green'), 255), map.get($SA98G, mainTRC)) +
41 map.get($SA98G, sBco) * math.pow(math.div(color.channel($rgb, 'blue'), 255), map.get($SA98G, mainTRC)); 41 map.get($SA98G, sBco) * math.pow(math.div(color.channel($rgb, 'blue'), 255), map.get($SA98G, mainTRC));
42} 42}
43 43
44@function Y_to_sRGB($y) { 44@function Y_to_sRGB($y) {
45 $c: math.round(math.pow($y, math.div(1, map.get($SA98G, mainTRC))) * 255); 45 $c: math.round(math.pow($y, math.div(1, map.get($SA98G, mainTRC))) * 255);
46 @return rgb($c, $c, $c); 46 @return rgb($c, $c, $c);
47} 47}
48 48
49@function contrast($txtY, $bgY) { 49@function contrast($txtY, $bgY) {
50 /* stylelint-disable-next-line @stylistic/number-no-trailing-zeros */ 50 /* stylelint-disable-next-line @stylistic/number-no-trailing-zeros */
51 $icp: .0 1.1; 51 $icp: .0 1.1;
52 52
53 @if math.min($txtY, $bgY) < list.nth($icp, 1) or math.max($txtY, $bgY) > list.nth($icp, 2) { 53 @if math.min($txtY, $bgY) < list.nth($icp, 1) or math.max($txtY, $bgY) > list.nth($icp, 2) {
54 @return 0; 54 @return 0;
55 } 55 }
56 56
57 @if $txtY <= map.get($SA98G, blkThrs) { 57 @if $txtY <= map.get($SA98G, blkThrs) {
58 $txtY: $txtY + math.pow(map.get($SA98G, blkThrs) - $txtY, map.get($SA98G, blkClmp)); 58 $txtY: $txtY + math.pow(map.get($SA98G, blkThrs) - $txtY, map.get($SA98G, blkClmp));
59 } 59 }
60 @if $bgY <= map.get($SA98G, blkThrs) { 60 @if $bgY <= map.get($SA98G, blkThrs) {
61 $bgY: $bgY + math.pow(map.get($SA98G, blkThrs) - $bgY, map.get($SA98G, blkClmp)); 61 $bgY: $bgY + math.pow(map.get($SA98G, blkThrs) - $bgY, map.get($SA98G, blkClmp));
62 } 62 }
63 63
64 @if math.abs($bgY - $txtY) < map.get($SA98G, deltaYmin) { 64 @if math.abs($bgY - $txtY) < map.get($SA98G, deltaYmin) {
65 @return 0; 65 @return 0;
66 } 66 }
67 67
68 $outputContrast: 0; 68 $outputContrast: 0;
69 69
70 @if $bgY > $txtY { 70 @if $bgY > $txtY {
71 $SAPC: map.get($SA98G, scaleBoW) * (math.pow($bgY, map.get($SA98G, normBG)) - math.pow($txtY, map.get($SA98G, normTXT))); 71 $SAPC: map.get($SA98G, scaleBoW) * (math.pow($bgY, map.get($SA98G, normBG)) - math.pow($txtY, map.get($SA98G, normTXT)));
72 72
73 @if $SAPC >= map.get($SA98G, loClip) { 73 @if $SAPC >= map.get($SA98G, loClip) {
74 $outputContrast: $SAPC - map.get($SA98G, loBoWoffset); 74 $outputContrast: $SAPC - map.get($SA98G, loBoWoffset);
75 } 75 }
76 } @else { 76 } @else {
77 $SAPC: map.get($SA98G, scaleWoB) * (math.pow($bgY, map.get($SA98G, revBG)) - math.pow($txtY, map.get($SA98G, revTXT))); 77 $SAPC: map.get($SA98G, scaleWoB) * (math.pow($bgY, map.get($SA98G, revBG)) - math.pow($txtY, map.get($SA98G, revTXT)));
78 78
79 @if $SAPC <= -1 * map.get($SA98G, loClip) { 79 @if $SAPC <= -1 * map.get($SA98G, loClip) {
80 $outputContrast: $SAPC + map.get($SA98G, loWoBoffset); 80 $outputContrast: $SAPC + map.get($SA98G, loWoBoffset);
81 } 81 }
82 } 82 }
83 83
84 @return $outputContrast * 100; 84 @return $outputContrast * 100;
85} 85}
86 86
87@function reverse($contrast, $knownY, $knownType: 'bg') { 87@function reverse($contrast, $knownY, $knownType: 'bg') {
88 $unknownY: $knownY; 88 $unknownY: $knownY;
89 89
90 $knownExp: 0; 90 $knownExp: 0;
91 $unknownExp: 0; 91 $unknownExp: 0;
92 92
93 $scale: map.get($SA98G, if($contrast > 0, scaleBoW, scaleWoB)); 93 $scale: map.get($SA98G, if($contrast > 0, scaleBoW, scaleWoB));
94 $offset: map.get($SA98G, if($contrast > 0, loBoWoffset, loWoBoffset)); 94 $offset: map.get($SA98G, if($contrast > 0, loBoWoffset, loWoBoffset));
95 95
96 $contrast: math.div($contrast * .01 + $offset, $scale); 96 $contrast: math.div($contrast * .01 + $offset, $scale);
97 97
98 @if $knownY <= map.get($SA98G, blkThrs) { 98 @if $knownY <= map.get($SA98G, blkThrs) {
99 $knownY: $knownY + math.pow(map.get($SA98G, blkThrs) - $knownY, map.get($SA98G, blkClmp)); 99 $knownY: $knownY + math.pow(map.get($SA98G, blkThrs) - $knownY, map.get($SA98G, blkClmp));
100 } 100 }
101 101
102 @if $knownType == 'bg' { 102 @if $knownType == 'bg' {
103 $knownExp: map.get($SA98G, if($contrast > 0, normBG, revBG)); 103 $knownExp: map.get($SA98G, if($contrast > 0, normBG, revBG));
104 $unknownExp: map.get($SA98G, if($contrast > 0, normTXT, revTXT)); 104 $unknownExp: map.get($SA98G, if($contrast > 0, normTXT, revTXT));
105 $unknownY: math.pow(math.pow($knownY, $knownExp) - $contrast, math.div(1, $unknownExp)); 105 $unknownY: math.pow(math.pow($knownY, $knownExp) - $contrast, math.div(1, $unknownExp));
106 } @else { 106 } @else {
107 $knownExp: map.get($SA98G, if($contrast > 0, normTXT, revTXT)); 107 $knownExp: map.get($SA98G, if($contrast > 0, normTXT, revTXT));
108 $unknownExp: map.get($SA98G, if($contrast > 0, normBG, revBG)); 108 $unknownExp: map.get($SA98G, if($contrast > 0, normBG, revBG));
109 $unknownY: math.pow($contrast + math.pow($knownY, $knownExp), math.div(1, $unknownExp)); 109 $unknownY: math.pow($contrast + math.pow($knownY, $knownExp), math.div(1, $unknownExp));
110 } 110 }
111 111
112 @if '#{$unknownY}' == '#{math.sqrt(-1)}' { 112 @if '#{$unknownY}' == '#{math.sqrt(-1)}' {
113 @return false; 113 @return false;
114 } 114 }
115 115
116 @if $unknownY > 1.06 or $unknownY < 0 { 116 @if $unknownY > 1.06 or $unknownY < 0 {
117 @return false; 117 @return false;
118 } 118 }
119 119
120 @if $unknownY <= map.get($SA98G, blkThrs) { 120 @if $unknownY <= map.get($SA98G, blkThrs) {
121 $unknownY: math.pow(($unknownY + map.get($SA98G, mOffsetIn)) * map.get($SA98G, mFactor), math.div(map.get($SA98G, mExpAdj), map.get($SA98G, blkClmp))) * math.div(1, map.get($SA98G, mFactor)) - map.get($SA98G, mOffsetOut); 121 $unknownY: math.pow(($unknownY + map.get($SA98G, mOffsetIn)) * map.get($SA98G, mFactor), math.div(map.get($SA98G, mExpAdj), map.get($SA98G, blkClmp))) * math.div(1, map.get($SA98G, mFactor)) - map.get($SA98G, mOffsetOut);
122 } 122 }
123 123
124 $unknownY: math.max(math.min($unknownY, 1), 0); 124 $unknownY: math.max(math.min($unknownY, 1), 0);
125 125
126 @return $unknownY; 126 @return $unknownY;
127} 127}
generated by cgit v1.2.3-70-g09d2 (git 2.50.0) at 2025-08-12 02:48:06 +0000