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This commit was originally automatically generated using `tools/lint --only=eslint --fix`. It was then modified by tabbott to contain only changes to a set of files that are unlikely to result in significant merge conflicts with any open pull request, excluding about 20 files. His plan is to merge the remaining changes with more precise care, potentially involving merging parts of conflicting pull requests before running the `eslint --fix` operation. Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
53 lines
1.6 KiB
JavaScript
53 lines
1.6 KiB
JavaScript
// Convert an sRGB value in [0, 255] to a linear intensity
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// value in [0, 1].
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//
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// http://en.wikipedia.org/wiki/SRGB#The_reverse_transformation
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exports.sRGB_to_linear = function (v) {
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v = v / 255.0;
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if (v <= 0.04045) {
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return v / 12.92;
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}
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return Math.pow((v + 0.055) / 1.055, 2.4);
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};
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// Compute luminance (CIE Y stimulus) from linear intensity
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// of sRGB / Rec. 709 primaries.
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exports.rgb_luminance = function (channel) {
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return 0.2126 * channel[0] + 0.7152 * channel[1] + 0.0722 * channel[2];
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};
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// Convert luminance (photometric, CIE Y)
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// to lightness (perceptual, CIE L*)
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//
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// http://en.wikipedia.org/wiki/Lab_color_space#Forward_transformation
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exports.luminance_to_lightness = function (luminance) {
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let v;
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if (luminance <= 216 / 24389) {
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v = 841 / 108 * luminance + 4 / 29;
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} else {
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v = Math.pow(luminance, 1 / 3);
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}
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return 116 * v - 16;
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};
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exports.getDecimalColor = function (hexcolor) {
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return {r: parseInt(hexcolor.substr(1, 2), 16),
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g: parseInt(hexcolor.substr(3, 2), 16),
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b: parseInt(hexcolor.substr(5, 2), 16)};
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};
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exports.getLighterColor = function (rgb, lightness) {
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return {r: (lightness * 255 + (1 - lightness) * rgb.r).toFixed(),
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g: (lightness * 255 + (1 - lightness) * rgb.g).toFixed(),
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b: (lightness * 255 + (1 - lightness) * rgb.b).toFixed()};
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};
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exports.getHexColor = function (rgb) {
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return "#" + parseInt(rgb.r, 10).toString(16) +
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parseInt(rgb.g, 10).toString(16) +
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parseInt(rgb.b, 10).toString(16);
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};
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window.colorspace = exports;
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