106 lines
4.2 KiB
JavaScript
106 lines
4.2 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.fromWhiteIsZero = fromWhiteIsZero;
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exports.fromBlackIsZero = fromBlackIsZero;
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exports.fromPalette = fromPalette;
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exports.fromCMYK = fromCMYK;
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exports.fromYCbCr = fromYCbCr;
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exports.fromCIELab = fromCIELab;
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function fromWhiteIsZero(raster, max) {
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const { width, height } = raster;
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const rgbRaster = new Uint8Array(width * height * 3);
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let value;
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for (let i = 0, j = 0; i < raster.length; ++i, j += 3) {
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value = 256 - (raster[i] / max) * 256;
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rgbRaster[j] = value;
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rgbRaster[j + 1] = value;
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rgbRaster[j + 2] = value;
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}
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return rgbRaster;
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}
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function fromBlackIsZero(raster, max) {
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const { width, height } = raster;
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const rgbRaster = new Uint8Array(width * height * 3);
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let value;
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for (let i = 0, j = 0; i < raster.length; ++i, j += 3) {
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value = (raster[i] / max) * 256;
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rgbRaster[j] = value;
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rgbRaster[j + 1] = value;
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rgbRaster[j + 2] = value;
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}
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return rgbRaster;
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}
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function fromPalette(raster, colorMap) {
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const { width, height } = raster;
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const rgbRaster = new Uint8Array(width * height * 3);
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const greenOffset = colorMap.length / 3;
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const blueOffset = (colorMap.length / 3) * 2;
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for (let i = 0, j = 0; i < raster.length; ++i, j += 3) {
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const mapIndex = raster[i];
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rgbRaster[j] = (colorMap[mapIndex] / 65536) * 256;
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rgbRaster[j + 1] = (colorMap[mapIndex + greenOffset] / 65536) * 256;
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rgbRaster[j + 2] = (colorMap[mapIndex + blueOffset] / 65536) * 256;
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}
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return rgbRaster;
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}
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function fromCMYK(cmykRaster) {
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const { width, height } = cmykRaster;
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const rgbRaster = new Uint8Array(width * height * 3);
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for (let i = 0, j = 0; i < cmykRaster.length; i += 4, j += 3) {
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const c = cmykRaster[i];
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const m = cmykRaster[i + 1];
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const y = cmykRaster[i + 2];
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const k = cmykRaster[i + 3];
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rgbRaster[j] = 255 * ((255 - c) / 256) * ((255 - k) / 256);
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rgbRaster[j + 1] = 255 * ((255 - m) / 256) * ((255 - k) / 256);
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rgbRaster[j + 2] = 255 * ((255 - y) / 256) * ((255 - k) / 256);
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}
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return rgbRaster;
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}
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function fromYCbCr(yCbCrRaster) {
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const { width, height } = yCbCrRaster;
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const rgbRaster = new Uint8ClampedArray(width * height * 3);
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for (let i = 0, j = 0; i < yCbCrRaster.length; i += 3, j += 3) {
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const y = yCbCrRaster[i];
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const cb = yCbCrRaster[i + 1];
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const cr = yCbCrRaster[i + 2];
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rgbRaster[j] = y + 1.402 * (cr - 0x80);
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rgbRaster[j + 1] = y - 0.34414 * (cb - 0x80) - 0.71414 * (cr - 0x80);
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rgbRaster[j + 2] = y + 1.772 * (cb - 0x80);
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}
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return rgbRaster;
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}
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const Xn = 0.95047;
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const Yn = 1.0;
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const Zn = 1.08883;
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// from https://github.com/antimatter15/rgb-lab/blob/master/color.js
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function fromCIELab(cieLabRaster) {
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const { width, height } = cieLabRaster;
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const rgbRaster = new Uint8Array(width * height * 3);
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for (let i = 0, j = 0; i < cieLabRaster.length; i += 3, j += 3) {
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const L = cieLabRaster[i + 0];
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const a_ = (cieLabRaster[i + 1] << 24) >> 24; // conversion from uint8 to int8
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const b_ = (cieLabRaster[i + 2] << 24) >> 24; // same
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let y = (L + 16) / 116;
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let x = a_ / 500 + y;
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let z = y - b_ / 200;
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let r;
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let g;
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let b;
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x = Xn * (x * x * x > 0.008856 ? x * x * x : (x - 16 / 116) / 7.787);
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y = Yn * (y * y * y > 0.008856 ? y * y * y : (y - 16 / 116) / 7.787);
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z = Zn * (z * z * z > 0.008856 ? z * z * z : (z - 16 / 116) / 7.787);
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r = x * 3.2406 + y * -1.5372 + z * -0.4986;
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g = x * -0.9689 + y * 1.8758 + z * 0.0415;
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b = x * 0.0557 + y * -0.204 + z * 1.057;
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r = r > 0.0031308 ? 1.055 * r ** (1 / 2.4) - 0.055 : 12.92 * r;
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g = g > 0.0031308 ? 1.055 * g ** (1 / 2.4) - 0.055 : 12.92 * g;
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b = b > 0.0031308 ? 1.055 * b ** (1 / 2.4) - 0.055 : 12.92 * b;
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rgbRaster[j] = Math.max(0, Math.min(1, r)) * 255;
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rgbRaster[j + 1] = Math.max(0, Math.min(1, g)) * 255;
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rgbRaster[j + 2] = Math.max(0, Math.min(1, b)) * 255;
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}
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return rgbRaster;
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}
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//# sourceMappingURL=rgb.js.map
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//# sourceMappingURL=rgb.js.map
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