molstar
Version:
A comprehensive macromolecular library.
45 lines (44 loc) • 1.98 kB
JavaScript
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/**
* Copyright (c) 2019-2025 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author Alexander Rose <alexander.rose@weirdbyte.de>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.packIntToRGBArray = packIntToRGBArray;
exports.unpackRGBToInt = unpackRGBToInt;
exports.unpackRGBAToDepth = unpackRGBAToDepth;
exports.arrayMaxPackedIntToRGB = arrayMaxPackedIntToRGB;
const interpolate_1 = require("../mol-math/interpolate");
const linear_algebra_1 = require("../mol-math/linear-algebra");
/** encode positive integer as rgb byte triplet into array at offset */
function packIntToRGBArray(value, array, offset) {
value = (0, interpolate_1.clamp)(Math.round(value), 0, 16777216 - 1) + 1;
array[offset + 2] = value % 256;
value = Math.floor(value / 256);
array[offset + 1] = value % 256;
value = Math.floor(value / 256);
array[offset] = value % 256;
return array;
}
/** decode positive integer encoded as rgb byte triplet */
function unpackRGBToInt(r, g, b) {
return (Math.floor(r) * 256 * 256 + Math.floor(g) * 256 + Math.floor(b)) - 1;
}
const UnpackDownscale = 255 / 256; // 0..1 -> fraction (excluding 1)
const PackFactors = linear_algebra_1.Vec3.create(256 * 256 * 256, 256 * 256, 256);
const UnpackFactors = linear_algebra_1.Vec4.create(UnpackDownscale / PackFactors[0], UnpackDownscale / PackFactors[1], UnpackDownscale / PackFactors[2], UnpackDownscale / 1);
const tmpDepthRGBA = (0, linear_algebra_1.Vec4)();
function unpackRGBAToDepth(r, g, b, a) {
linear_algebra_1.Vec4.set(tmpDepthRGBA, r / 255, g / 255, b / 255, a / 255);
return linear_algebra_1.Vec4.dot(tmpDepthRGBA, UnpackFactors);
}
function arrayMaxPackedIntToRGB(array, stride) {
let max = -Infinity;
for (let i = 0, il = array.length; i < il; i += stride) {
const v = unpackRGBToInt(array[i], array[i + 1], array[i + 2]);
if (v > max)
max = v;
}
return max;
}