geotiff
Version:
GeoTIFF image decoding in JavaScript
88 lines • 3.9 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.preferWorker = exports.getDecoder = exports.addDecoder = void 0;
const registry = new Map();
const preferWorkerMap = new Map();
/**
* Either a number or undefined.
* @typedef {(number|undefined)} NumberOrUndefined
*/
/**
* Register a decoder for a specific compression method or a range of compressions
* @param {(NumberOrUndefined|(NumberOrUndefined[]))} cases ids of the compression methods to register for
* @param {function():Promise} importFn the function to import the decoder
* @param {boolean} preferWorker_ Whether to prefer running the decoder in a worker
*/
function addDecoder(cases, importFn, preferWorker_ = true) {
if (!Array.isArray(cases)) {
cases = [cases]; // eslint-disable-line no-param-reassign
}
cases.forEach((c) => {
registry.set(c, importFn);
preferWorkerMap.set(c, preferWorker_);
});
}
exports.addDecoder = addDecoder;
/**
* Get a decoder for a specific file directory
* @param {object} fileDirectory the file directory of the image
* @returns {Promise<Decoder>}
*/
async function getDecoder(fileDirectory) {
const importFn = registry.get(fileDirectory.Compression);
if (!importFn) {
throw new Error(`Unknown compression method identifier: ${fileDirectory.Compression}`);
}
const Decoder = await importFn();
return new Decoder(fileDirectory);
}
exports.getDecoder = getDecoder;
/**
* Whether to prefer running the decoder in a worker
* @param {object} fileDirectory the file directory of the image
* @returns {boolean}
*/
function preferWorker(fileDirectory) {
return preferWorkerMap.get(fileDirectory.Compression);
}
exports.preferWorker = preferWorker;
// Add default decoders to registry (end-user may override with other implementations)
addDecoder([undefined, 1], () => Promise.resolve().then(() => __importStar(require('./raw.js'))).then((m) => m.default), false);
addDecoder(5, () => Promise.resolve().then(() => __importStar(require('./lzw.js'))).then((m) => m.default));
addDecoder(6, () => {
throw new Error('old style JPEG compression is not supported.');
});
addDecoder(7, () => Promise.resolve().then(() => __importStar(require('./jpeg.js'))).then((m) => m.default));
addDecoder([8, 32946], () => Promise.resolve().then(() => __importStar(require('./deflate.js'))).then((m) => m.default));
addDecoder(32773, () => Promise.resolve().then(() => __importStar(require('./packbits.js'))).then((m) => m.default));
addDecoder(34887, () => Promise.resolve().then(() => __importStar(require('./lerc.js'))).then(async (m) => {
await m.zstd.init();
return m;
})
.then((m) => m.default));
addDecoder(50000, () => Promise.resolve().then(() => __importStar(require('./zstd.js'))).then(async (m) => {
await m.zstd.init();
return m;
})
.then((m) => m.default));
addDecoder(50001, () => Promise.resolve().then(() => __importStar(require('./webimage.js'))).then((m) => m.default), false);
//# sourceMappingURL=index.js.map