46 lines
1.9 KiB
JavaScript
46 lines
1.9 KiB
JavaScript
"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.zstd = void 0;
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const pako_1 = require("pako");
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// @ts-expect-error
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const lerc_1 = __importDefault(require("lerc"));
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const zstddec_1 = require("zstddec");
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const basedecoder_js_1 = __importDefault(require("./basedecoder.js"));
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const globals_js_1 = require("../globals.js");
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/**
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* @typedef {import('./basedecoder.js').BaseDecoderParameters & { LercParameters?: any }} LercDecoderParameters
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*/
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exports.zstd = new zstddec_1.ZSTDDecoder();
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class LercDecoder extends basedecoder_js_1.default {
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/**
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* @param {ArrayBufferLike} buffer
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* @returns {ArrayBufferLike}
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*/
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decodeBlock(buffer) {
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const params = /** @type {LercDecoderParameters} */ (this.parameters);
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const addCompression = params.LercParameters?.[globals_js_1.LercParameters.AddCompression];
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/** @type {ArrayBufferLike} */
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let decoded = buffer;
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switch (addCompression) {
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case globals_js_1.LercAddCompression.None:
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break;
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case globals_js_1.LercAddCompression.Deflate:
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decoded = (0, pako_1.inflate)(new Uint8Array(decoded)).buffer;
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break;
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case globals_js_1.LercAddCompression.Zstandard:
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decoded = exports.zstd.decode(new Uint8Array(decoded)).buffer;
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break;
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default:
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throw new Error(`Unsupported LERC additional compression method identifier: ${addCompression}`);
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}
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const lercResult = lerc_1.default.decode(decoded, { returnPixelInterleavedDims: this.parameters.planarConfiguration === 1 });
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const lercData = lercResult.pixels[0];
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return lercData.buffer;
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}
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}
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exports.default = LercDecoder;
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//# sourceMappingURL=lerc.js.map
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//# sourceMappingURL=lerc.js.map
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