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Fix floor/ceil in luminance methods

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This commit is contained in:
Daniel Imms
2019-11-11 23:11:36 -08:00
parent 9b139a744b
commit 2fc1791dde
2 changed files with 21 additions and 20 deletions
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src/browser/Color.ts
+7 -7
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@@ -129,10 +129,10 @@ export function reduceLuminance(bgRgba: number, fgRgba: number, ratio: number):
let fgB = (fgRgba >> 8) & 0xFF;
let cr = contrastRatio(rgbRelativeLuminance2(fgR, fgB, fgG), rgbRelativeLuminance2(bgR, bgG, bgB));
while (cr < ratio && (fgR > 0 || fgG > 0 || fgB > 0)) {
// Increase by 10% (ceil) 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));
// Reduce by 10% until the ratio is hit
fgR -= Math.max(0, Math.floor(fgR * 0.1));
fgG -= Math.max(0, Math.floor(fgG * 0.1));
fgB -= Math.max(0, Math.floor(fgB * 0.1));
cr = contrastRatio(rgbRelativeLuminance2(fgR, fgB, fgG), rgbRelativeLuminance2(bgR, bgG, bgB));
}
return fgR << 24 | fgG << 16 | fgB << 8 | 0xFF;
@@ -150,9 +150,9 @@ export function increaseLuminance(bgRgba: number, fgRgba: number, ratio: number)
let cr = contrastRatio(rgbRelativeLuminance2(fgR, fgB, fgG), rgbRelativeLuminance2(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.floor((255 - fgR) * 0.1));
fgG = Math.min(0xFF, fgG + Math.floor((255 - fgG) * 0.1));
fgB = Math.min(0xFF, fgB + Math.floor((255 - fgB) * 0.1));
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(rgbRelativeLuminance2(fgR, fgB, fgG), rgbRelativeLuminance2(bgR, bgG, bgB));
}
return fgR << 24 | fgG << 16 | fgB << 8 | 0xFF;