93 lines
2.3 KiB
JavaScript
93 lines
2.3 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule resolveAssetSource
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*/
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'use strict';
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var AssetRegistry = require('AssetRegistry');
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var PixelRatio = require('PixelRatio');
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var SourceCode = require('NativeModules').SourceCode;
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var _serverURL;
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function getServerURL() {
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if (_serverURL === undefined) {
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var scriptURL = SourceCode.scriptURL;
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var match = scriptURL && scriptURL.match(/^https?:\/\/.*?\//);
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if (match) {
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_serverURL = match[0];
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} else {
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_serverURL = null;
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}
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}
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return _serverURL;
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}
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function pickScale(scales, deviceScale) {
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// Packager guarantees that `scales` array is sorted
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for (var i = 0; i < scales.length; i++) {
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if (scales[i] >= deviceScale) {
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return scales[i];
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}
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}
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// If nothing matches, device scale is larger than any available
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// scales, so we return the biggest one. Unless the array is empty,
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// in which case we default to 1
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return scales[scales.length - 1] || 1;
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}
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function resolveAssetSource(source) {
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if (typeof source === 'object') {
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return source;
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}
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var asset = AssetRegistry.getAssetByID(source);
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if (asset) {
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return assetToImageSource(asset);
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}
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return null;
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}
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function assetToImageSource(asset) {
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// TODO(frantic): currently httpServerLocation is used both as
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// path in http URL and path within IPA. Should we have zipArchiveLocation?
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var path = asset.httpServerLocation;
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if (path[0] === '/') {
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path = path.substr(1);
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}
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var scale = pickScale(asset.scales, PixelRatio.get());
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var scaleSuffix = scale === 1 ? '' : '@' + scale + 'x';
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var fileName = asset.name + scaleSuffix + '.' + asset.type;
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var serverURL = getServerURL();
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if (serverURL) {
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return {
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width: asset.width,
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height: asset.height,
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uri: serverURL + path + '/' + fileName +
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'?hash=' + asset.hash,
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isStatic: false,
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};
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} else {
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return {
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width: asset.width,
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height: asset.height,
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uri: path + '/' + fileName,
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isStatic: true,
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};
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}
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}
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module.exports = resolveAssetSource;
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module.exports.pickScale = pickScale;
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