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Fix color channel used by luminance functions

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This commit is contained in:
Daniel Imms
2022-05-09 15:36:54 -07:00
parent 0c6877f46f
commit 10598462d0
1 changed files with 4 additions and 4 deletions
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src/common/Color.ts
+4 -4
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@@ -172,13 +172,13 @@ export namespace rgba {
let fgR = (fgRgba >> 24) & 0xFF;
let fgG = (fgRgba >> 16) & 0xFF;
let fgB = (fgRgba >> 8) & 0xFF;
let cr = contrastRatio(rgb.relativeLuminance2(fgR, fgB, fgG), rgb.relativeLuminance2(bgR, bgG, bgB));
let cr = contrastRatio(rgb.relativeLuminance2(fgR, fgG, fgB), rgb.relativeLuminance2(bgR, bgG, bgB));
while (cr < ratio && (fgR > 0 || fgG > 0 || fgB > 0)) {
// Reduce by 10% until the ratio is hit
fgR -= Math.max(0, Math.ceil(fgR * 0.1));
fgG -= Math.max(0, Math.ceil(fgG * 0.1));
fgB -= Math.max(0, Math.ceil(fgB * 0.1));
cr = contrastRatio(rgb.relativeLuminance2(fgR, fgB, fgG), rgb.relativeLuminance2(bgR, bgG, bgB));
cr = contrastRatio(rgb.relativeLuminance2(fgR, fgG, fgB), rgb.relativeLuminance2(bgR, bgG, bgB));
}
return (fgR << 24 | fgG << 16 | fgB << 8 | 0xFF) >>> 0;
}
@@ -192,13 +192,13 @@ export namespace rgba {
let fgR = (fgRgba >> 24) & 0xFF;
let fgG = (fgRgba >> 16) & 0xFF;
let fgB = (fgRgba >> 8) & 0xFF;
let cr = contrastRatio(rgb.relativeLuminance2(fgR, fgB, fgG), rgb.relativeLuminance2(bgR, bgG, bgB));
let cr = contrastRatio(rgb.relativeLuminance2(fgR, fgG, fgB), rgb.relativeLuminance2(bgR, bgG, bgB));
while (cr < ratio && (fgR < 0xFF || fgG < 0xFF || fgB < 0xFF)) {
// Increase by 10% until the ratio is hit
fgR = Math.min(0xFF, fgR + Math.ceil((255 - fgR) * 0.1));
fgG = Math.min(0xFF, fgG + Math.ceil((255 - fgG) * 0.1));
fgB = Math.min(0xFF, fgB + Math.ceil((255 - fgB) * 0.1));
cr = contrastRatio(rgb.relativeLuminance2(fgR, fgB, fgG), rgb.relativeLuminance2(bgR, bgG, bgB));
cr = contrastRatio(rgb.relativeLuminance2(fgR, fgG, fgB), rgb.relativeLuminance2(bgR, bgG, bgB));
}
return (fgR << 24 | fgG << 16 | fgB << 8 | 0xFF) >>> 0;
}