39 lines
No EOL
1.5 KiB
JavaScript
39 lines
No EOL
1.5 KiB
JavaScript
import { clamp } from '../../util/helpers'; // For converting XYZ to sRGB
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const srgbForwardMatrix = [[3.2406, -1.5372, -0.4986], [-0.9689, 1.8758, 0.0415], [0.0557, -0.2040, 1.0570]]; // Forward gamma adjust
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const srgbForwardTransform = C => C <= 0.0031308 ? C * 12.92 : 1.055 * C ** (1 / 2.4) - 0.055; // For converting sRGB to XYZ
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const srgbReverseMatrix = [[0.4124, 0.3576, 0.1805], [0.2126, 0.7152, 0.0722], [0.0193, 0.1192, 0.9505]]; // Reverse gamma adjust
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const srgbReverseTransform = C => C <= 0.04045 ? C / 12.92 : ((C + 0.055) / 1.055) ** 2.4;
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export function fromXYZ(xyz) {
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const rgb = Array(3);
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const transform = srgbForwardTransform;
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const matrix = srgbForwardMatrix; // Matrix transform, then gamma adjustment
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for (let i = 0; i < 3; ++i) {
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rgb[i] = Math.round(clamp(transform(matrix[i][0] * xyz[0] + matrix[i][1] * xyz[1] + matrix[i][2] * xyz[2])) * 255);
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} // Rescale back to [0, 255]
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return (rgb[0] << 16) + (rgb[1] << 8) + (rgb[2] << 0);
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}
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export function toXYZ(rgb) {
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const xyz = [0, 0, 0];
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const transform = srgbReverseTransform;
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const matrix = srgbReverseMatrix; // Rescale from [0, 255] to [0, 1] then adjust sRGB gamma to linear RGB
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const r = transform((rgb >> 16 & 0xff) / 255);
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const g = transform((rgb >> 8 & 0xff) / 255);
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const b = transform((rgb >> 0 & 0xff) / 255); // Matrix color space transform
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for (let i = 0; i < 3; ++i) {
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xyz[i] = matrix[i][0] * r + matrix[i][1] * g + matrix[i][2] * b;
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}
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return xyz;
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}
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//# sourceMappingURL=transformSRGB.js.map
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