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33 lines
1.6 KiB
33 lines
1.6 KiB
"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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const pako_1 = require("pako");
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const lerc_1 = __importDefault(require("lerc"));
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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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class LercDecoder extends basedecoder_js_1.default {
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constructor(fileDirectory) {
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super();
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this.planarConfiguration = typeof fileDirectory.PlanarConfiguration !== 'undefined' ? fileDirectory.PlanarConfiguration : 1;
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this.samplesPerPixel = typeof fileDirectory.SamplesPerPixel !== 'undefined' ? fileDirectory.SamplesPerPixel : 1;
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this.addCompression = fileDirectory.LercParameters[globals_js_1.LercParameters.AddCompression];
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}
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decodeBlock(buffer) {
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switch (this.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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buffer = (0, pako_1.inflate)(new Uint8Array(buffer)).buffer; // eslint-disable-line no-param-reassign, prefer-destructuring
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break;
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default:
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throw new Error(`Unsupported LERC additional compression method identifier: ${this.addCompression}`);
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}
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const lercResult = lerc_1.default.decode(buffer, { returnPixelInterleavedDims: this.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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