molstar
Version:
A comprehensive macromolecular library.
44 lines • 2.24 kB
JavaScript
;
/**
* Copyright (c) 2017 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author David Sehnal <david.sehnal@gmail.com>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.typedArrayWindow = exports.isTypedArray = exports.createAndFillArray = exports.fillArrayValues = exports.createArray = exports.getArrayBounds = void 0;
function getArrayBounds(rowCount, params) {
var start = params && typeof params.start !== 'undefined' ? Math.max(Math.min(params.start, rowCount - 1), 0) : 0;
var end = params && typeof params.end !== 'undefined' ? Math.min(params.end, rowCount) : rowCount;
return { start: start, end: end };
}
exports.getArrayBounds = getArrayBounds;
function createArray(rowCount, params) {
var c = params && typeof params.array !== 'undefined' ? params.array : Array;
var _a = getArrayBounds(rowCount, params), start = _a.start, end = _a.end;
return { array: new c(end - start), start: start, end: end };
}
exports.createArray = createArray;
function fillArrayValues(value, target, start) {
for (var i = 0, _e = target.length; i < _e; i++)
target[i] = value(start + i);
return target;
}
exports.fillArrayValues = fillArrayValues;
function createAndFillArray(rowCount, value, params) {
var _a = createArray(rowCount, params), array = _a.array, start = _a.start;
return fillArrayValues(value, array, start);
}
exports.createAndFillArray = createAndFillArray;
function isTypedArray(data) {
return !!data.buffer && typeof data.byteLength === 'number' && typeof data.BYTES_PER_ELEMENT === 'number';
}
exports.isTypedArray = isTypedArray;
function typedArrayWindow(data, params) {
var constructor = data.constructor, buffer = data.buffer, length = data.length, byteOffset = data.byteOffset, BYTES_PER_ELEMENT = data.BYTES_PER_ELEMENT;
var _a = getArrayBounds(length, params), start = _a.start, end = _a.end;
if (start === 0 && end === length)
return data;
return new constructor(buffer, byteOffset + BYTES_PER_ELEMENT * start, Math.min(length, end - start));
}
exports.typedArrayWindow = typedArrayWindow;
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