Add IIIF Image API tilesource with example
src/ol/source/IIIF.js contains a tile source for IIIF Image API services. It supports Image API version 1 and 2 on compliance levels 0, 1 and 2. To get working constructor options for IIIF from an IIIF image info.json, use src/ol/format/IIIFInfo.js. An example is available in examples/iiif.html respectivly examples/iiif.js.
This commit is contained in:
Lutz Helm
Lutz Helm
16
examples/iiif.html
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16
examples/iiif.html
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@@ -0,0 +1,16 @@
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---
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layout: example.html
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title: IIIF Image API
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shortdesc: Example of a IIIF Image API source.
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docs: >
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Example of a tile source for an International Image Interoperability Framework (IIIF) Image Service.
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Try any Image API version 1 or 2 service.
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tags: "IIIF, IIIF Image API, tile source"
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---
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<div id="map" class="map"></div>
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<div class="controls">
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<div id="iiif-notification"> </div>
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Enter <code>info.json</code> URL:
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<input type="text" id="imageInfoUrl" value="https://iiif.ub.uni-leipzig.de/iiif/j2k/0000/0102/0000010218/00000061.jpx/info.json">
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<button id="display">Display image</button>
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</div>
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48
examples/iiif.js
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48
examples/iiif.js
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@@ -0,0 +1,48 @@
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import Map from '../src/ol/Map.js';
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import View from '../src/ol/View.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import IIIF from '../src/ol/source/IIIF.js';
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import IIIFInfo from '../src/ol/format/IIIFInfo.js';
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const layer = new TileLayer(),
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map = new Map({
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layers: [layer],
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target: 'map'
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});
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const notifyDiv = document.getElementById('iiif-notification');
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function refreshMap(imageInfoUrl) {
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fetch(imageInfoUrl).then(function(response) {
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response.json().then(function(imageInfo) {
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const options = new IIIFInfo().readFromJson(imageInfo);
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if (options === undefined || options.version === undefined) {
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notifyDiv.textContent = 'Data seems to be no valid IIIF image information.';
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return;
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}
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const extent = [0, -options.size[1], options.size[0], 0];
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layer.setSource(new IIIF(options));
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map.setView(new View({
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resolutions: layer.getSource().getTileGrid().getResolutions(),
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extent: extent,
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constrainOnlyCenter: true
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}));
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map.getView().fit(extent);
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notifyDiv.textContent = '';
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}).catch(function(body) {
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notifyDiv.textContent = 'Could not read image info json. ' + body;
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});
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}).catch(function() {
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notifyDiv.textContent = 'Could not read data from URL.';
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});
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}
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const urlInput = document.getElementById('imageInfoUrl');
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const displayButton = document.getElementById('display');
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displayButton.addEventListener('click', function() {
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const imageInfoUrl = urlInput.value;
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refreshMap(imageInfoUrl);
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});
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refreshMap(urlInput.value);
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@@ -7,6 +7,7 @@ export {default as GeoJSON} from './format/GeoJSON.js';
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export {default as GML} from './format/GML.js';
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export {default as GPX} from './format/GPX.js';
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export {default as IGC} from './format/IGC.js';
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export {default as IIIFInfo} from './format/IIIFInfo.js';
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export {default as KML} from './format/KML.js';
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export {default as MVT} from './format/MVT.js';
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export {default as OWS} from './format/OWS.js';
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266
src/ol/format/IIIFInfo.js
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266
src/ol/format/IIIFInfo.js
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@@ -0,0 +1,266 @@
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/**
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* @module ol/format/IIIFInfo
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*/
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/**
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* Supported image formats, qualities and region / size calculation features
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* for different image API versions and compliance levels
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* @const
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* @type {Object<string, Object<string, Array<string>>>}
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*/
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const IIIF_PROFILE_VALUES = {
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version1: {
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level0: {
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features: [],
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formats: [],
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qualities: ['native']
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},
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level1: {
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features: ['regionByPx', 'sizeByW', 'sizeByH', 'sizeByPct'],
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formats: ['jpg'],
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qualities: ['native']
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},
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level2: {
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features: ['regionByPx', 'regionByPct', 'sizeByW', 'sizeByH', 'sizeByPct',
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'sizeByConfinedWh', 'sizeByWh'],
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formats: ['jpg', 'png'],
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qualities: ['native', 'color', 'grey', 'bitonal']
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}
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},
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version2: {
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level0: {
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features: [],
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formats: ['jpg'],
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qualities: ['default']
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},
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level1: {
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features: ['regionByPx', 'sizeByW', 'sizeByH', 'sizeByPct'],
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formats: ['jpg'],
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qualities: ['default']
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},
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level2: {
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features: ['regionByPx', 'regionByPct', 'sizeByW', 'sizeByH', 'sizeByPct',
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'sizeByConfinedWh', 'sizeByDistortedWh', 'sizeByWh'],
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formats: ['jpg', 'png'],
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qualities: ['default', 'bitonal']
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}
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},
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version3: {
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level0: {
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features: [],
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formats: ['jpg'],
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qualities: ['default']
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},
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level1: {
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features: ['regionByPx', 'regionSquare', 'sizeByW', 'sizeByH'],
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formats: ['jpg'],
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qualities: ['default']
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},
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level2: {
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features: ['regionByPx', 'regionSquare', 'regionByPct',
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'sizeByW', 'sizeByH', 'sizeByPct', 'sizeByConfinedWh', 'sizeByWh'],
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formats: ['jpg'],
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qualities: ['default', 'bitonal']
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}
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},
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none: {
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features: [],
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formats: [],
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qualities: []
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}
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};
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export const Versions = {
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VERSION1: 'version1',
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VERSION2: 'version2',
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VERSION3: 'version3'
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};
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function getComplianceLevelOfImageInfoForVersion(imageInfo, version) {
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switch (version) {
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case Versions.VERSION1:
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case Versions.VERSION3:
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return imageInfo.profile;
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case Versions.VERSION2:
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if (typeof imageInfo.profile === 'string') {
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return imageInfo.profile;
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}
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if (Array.isArray(imageInfo.profile) && imageInfo.profile.length > 0
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&& typeof imageInfo.profile[0] === 'string') {
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return imageInfo.profile[0];
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}
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// TODO error: cannot get compliance level URL / string
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break;
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default:
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// TODO error: invalid Image API version
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}
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}
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function getVersionOfImageInfo(imageInfo) {
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const context = imageInfo['@context'] || undefined;
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switch (context) {
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case 'http://library.stanford.edu/iiif/image-api/1.1/context.json':
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case 'http://iiif.io/api/image/1/context.json':
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return Versions.VERSION1;
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case 'http://iiif.io/api/image/2/context.json':
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return Versions.VERSION2;
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case 'http://iiif.io/api/image/3/context.json':
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return Versions.VERSION3;
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case undefined:
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// Image API 1.0 has no '@context'
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if (getComplianceLevelOfImageInfoForVersion(imageInfo, Versions.VERSION1)) {
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return Versions.VERSION1;
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}
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// TODO error: can't detect Image API version
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break;
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default:
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// TODO error: can't detect Image API version
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}
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}
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function getLevelProfileForImageInfo(imageInfo) {
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const version = getVersionOfImageInfo(imageInfo),
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complianceLevel = getComplianceLevelOfImageInfoForVersion(imageInfo, version);
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let level;
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if (version === undefined || complianceLevel === undefined) {
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return IIIF_PROFILE_VALUES.none;
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}
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level = complianceLevel.match(/level[0-2](\.json)?$/g);
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level = Array.isArray(level) ? level[0].replace('.json', '') : 'none';
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return IIIF_PROFILE_VALUES[version][level];
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}
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function generateVersion1Options(imageInfo) {
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const levelProfile = getLevelProfileForImageInfo(imageInfo);
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return {
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url: imageInfo['@id'].replace(/\/?(info.json)?$/g, ''),
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features: levelProfile.features,
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formats: [...levelProfile.formats, imageInfo.formats === undefined ?
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[] : imageInfo.formats
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],
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qualities: [...levelProfile.qualities, imageInfo.qualities === undefined ?
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[] : imageInfo.qualities
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],
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resolutions: imageInfo.scale_factors,
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tileSize: imageInfo.tile_width !== undefined ? imageInfo.tile_height != undefined ?
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[imageInfo.tile_width, imageInfo.tile_height] : [imageInfo.tile_width, imageInfo.tile_width] :
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imageInfo.tile_height != undefined ? [imageInfo.tile_height, imageInfo.tile_height] : undefined
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};
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}
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function generateVersion2Options(imageInfo) {
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const levelProfile = getLevelProfileForImageInfo(imageInfo),
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additionalProfile = Array.isArray(imageInfo.profile) && imageInfo.profile.length > 1,
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profileFeatures = additionalProfile && imageInfo.profile[1].supports ? imageInfo.profile[1].supports : [],
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profileFormats = additionalProfile && imageInfo.profile[1].formats ? imageInfo.profile[1].formats : [],
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profileQualities = additionalProfile && imageInfo.profile[1].qualities ? imageInfo.profile[1].qualities : [],
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attributions = [];
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if (imageInfo.attribution !== undefined) {
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// TODO potentially dangerous
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attributions.push(imageInfo.attribution);
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}
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if (imageInfo.license !== undefined) {
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let license = imageInfo.license;
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if (license.match(/^http(s)?:\/\//g)) {
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license = '<a href="' + encodeURI(license) + '"/>' + encodeURI(license) + '</a>';
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}
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// TODO potentially dangerous
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attributions.push(license);
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}
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return {
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url: imageInfo['@id'].replace(/\/?(info.json)?$/g, ''),
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sizes: imageInfo.sizes === undefined ? undefined : imageInfo.sizes.map(function(size) {
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return [size.width, size.height];
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}),
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tileSize: imageInfo.tiles === undefined ? undefined : [
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imageInfo.tiles.map(function(tile) {
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return tile.width;
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})[0],
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imageInfo.tiles.map(function(tile) {
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return tile.height;
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})[0]
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],
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resolutions: imageInfo.tiles === undefined ? undefined :
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imageInfo.tiles.map(function(tile) {
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return tile.scaleFactors;
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})[0],
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features: [...levelProfile.features, ...profileFeatures],
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formats: [...levelProfile.formats, ...profileFormats],
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qualities: [...levelProfile.qualities, ...profileQualities],
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attributions: attributions.length == 0 ? undefined : attributions
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};
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}
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function generateVersion3Options(imageInfo) {
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const levelProfile = getLevelProfileForImageInfo(imageInfo);
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return {
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url: imageInfo['id'],
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sizes: imageInfo.sizes === undefined ? undefined : imageInfo.sizes.map(function(size) {
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return [size.width, size.height];
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}),
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tileSize: imageInfo.tiles === undefined ? undefined : [
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imageInfo.tiles.map(function(tile) {
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return tile.width;
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})[0],
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imageInfo.tiles.map(function(tile) {
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return tile.height;
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})[0]
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],
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resolutions: imageInfo.tiles === undefined ? undefined :
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imageInfo.tiles.map(function(tile) {
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return tile.scaleFactors;
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})[0],
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features: imageInfo.extraFeatures === undefined ? levelProfile.features :
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[...levelProfile.features, ...imageInfo.extraFeatures],
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formats: imageInfo.extraFormats === undefined ? levelProfile.formats :
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[...levelProfile.formats, ...imageInfo.extraFormats],
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qualities: imageInfo.extraQualities === undefined ? levelProfile.qualities :
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[...levelProfile.extraQualities, ...imageInfo.extraQualities],
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maxWidth: undefined,
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maxHeight: undefined,
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maxArea: undefined,
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attributions: undefined
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};
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}
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const versionFunctions = {};
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versionFunctions[Versions.VERSION1] = generateVersion1Options;
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versionFunctions[Versions.VERSION2] = generateVersion2Options;
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versionFunctions[Versions.VERSION3] = generateVersion3Options;
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function getOptionsForImageInformation(imageInfo, preferredOptions) {
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const options = preferredOptions || {},
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version = getVersionOfImageInfo(imageInfo),
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optionAttributions = options.attributions ? options.attributions : [],
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imageOptions = version === undefined ? undefined : versionFunctions[version](imageInfo);
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if (imageOptions === undefined) {
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return;
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}
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return {
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url: options.url ? options.url : imageOptions.url,
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version: version,
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size: [imageInfo.width, imageInfo.height],
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sizes: imageOptions.sizes,
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format: imageOptions.formats.includes(options.format) ? options.format : 'jpg',
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features: imageOptions.features,
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quality: options.quality && imageOptions.qualities.includes(options.quality) ?
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options.quality : imageOptions.qualities.includes('native') ? 'native' : 'default',
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resolutions: Array.isArray(imageOptions.resolutions) ? imageOptions.resolutions.sort(function(a, b) {
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return b - a;
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}) : undefined,
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tileSize: imageOptions.tileSize,
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attributions: [
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...optionAttributions,
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...(imageOptions.attributions === undefined ? [] : imageOptions.attributions)
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]
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};
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}
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// TODO at the moment, this does not need to be a class.
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class IIIFInfo {
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readFromJson(imageInfo, preferredOptions) {
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return getOptionsForImageInformation(imageInfo, preferredOptions);
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}
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}
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export default IIIFInfo;
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@@ -5,6 +5,7 @@
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export {default as BingMaps} from './source/BingMaps.js';
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export {default as CartoDB} from './source/CartoDB.js';
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export {default as Cluster} from './source/Cluster.js';
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export {default as IIIF} from './source/IIIF.js';
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export {default as Image} from './source/Image.js';
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export {default as ImageArcGISRest} from './source/ImageArcGISRest.js';
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export {default as ImageCanvas} from './source/ImageCanvas.js';
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245
src/ol/source/IIIF.js
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245
src/ol/source/IIIF.js
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@@ -0,0 +1,245 @@
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/**
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* @module ol/source/IIIF
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*/
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import {DEFAULT_TILE_SIZE} from '../tilegrid/common.js';
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import {getTopLeft} from '../extent.js';
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import {CustomTile} from './Zoomify.js';
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import {Versions} from '../format/IIIFInfo.js';
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import {assert} from '../asserts.js';
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import TileGrid from '../tilegrid/TileGrid.js';
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import TileImage from './TileImage.js';
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/**
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* @typedef {Object} Options
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* @property {import("./Source.js").AttributionLike} [attributions] Attributions.
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* @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.
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* @property {number} [cacheSize]
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* @property {null|string} [crossOrigin]
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* @property {import("../proj.js").ProjectionLike} [projection]
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* @property {number} [tilePixelRatio]
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* @property {number} [reprojectionErrorThreshold=0.5]
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* @property {string} [url] Base URL of the IIIF Image service.
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* This shoulf be the same as the IIIF Image @id.
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* @property {import("../size.js").Size} [size] Size of the image [width, height].
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* @property {import("../size.js").Size[]} [sizes] Supported scaled image sizes.
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* Content of the IIIF info.json 'sizes' property, but as array of Size objects.
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* @property {import("../extent.js").Extent} [extent=[0, -height, width, 0]]
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* @property {number} [transition]
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* @property {number|import("../size.js").Size} [tileSize] Tile size.
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* Same tile size is used for all zoom levels. If tile size is a number,
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* a square tile is assumed. If the IIIF image service supports arbitrary
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* tiling (sizeByH, sizeByW or sizeByPct as well as regionByPx and regionByPct
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* are supported), the default tilesize is 256.
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* @property {boolean} [wrapX=false]
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*/
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/**
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* @classdesc
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* Layer source for tile data in IIIF format.
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* @api
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*/
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class IIIF extends TileImage {
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constructor(opt_options) {
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const options = opt_options || {};
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let baseUrl = options.url || '';
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baseUrl = baseUrl + (baseUrl.lastIndexOf('/') === baseUrl.length - 1 || baseUrl === '' ? '' : '/');
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const version = options.version || Versions.VERSION2;
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const sizes = options.sizes || [];
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const size = options.size;
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// TODO Appropriate error code
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assert(size != undefined && Array.isArray(size) && size.length == 2 &&
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!isNaN(size[0]) && size[0] > 0 && !isNaN(size[1] && size[1] > 0), 999);
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const width = size[0];
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const height = size[1];
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const tileSize = options.tileSize;
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const format = options.format || 'jpg';
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const quality = options.quality || (options.version == Versions.VERSION1 ? 'native' : 'default');
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let resolutions = options.resolutions || [];
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const features = options.features || [];
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const extent = options.extent || [0, -height, width, 0];
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const supportsListedSizes = sizes != undefined && Array.isArray(sizes) && sizes.length > 0;
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const supportsListedTiles = tileSize != undefined && (Number.isInteger(tileSize) && tileSize > 0 || Array.isArray(tileSize) && tileSize.length > 0);
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const supportsArbitraryTiling = features != undefined && Array.isArray(features) &&
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(features.includes('regionByPx') || features.includes('regionByPct')) &&
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(features.includes('sizeByWh') || features.includes('sizeByH') ||
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features.includes('sizeByW') || features.includes('sizeByPct'));
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let tileWidth,
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tileHeight,
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maxZoom;
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resolutions.sort(function(a, b) {
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return b - a;
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});
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|
||||
if (supportsListedTiles || supportsArbitraryTiling) {
|
||||
if (tileSize != undefined) {
|
||||
if (Number.isInteger(tileSize) && tileSize > 0) {
|
||||
tileWidth = tileSize;
|
||||
tileHeight = tileSize;
|
||||
} else if (Array.isArray(tileSize) && tileSize.length > 0) {
|
||||
if (tileSize.length == 1 || tileSize[1] == undefined && Number.isInteger(tileSize[0])) {
|
||||
tileWidth = tileSize[0];
|
||||
tileHeight = tileSize[0];
|
||||
}
|
||||
if (tileSize.length == 2) {
|
||||
if (Number.isInteger(tileSize[0]) && Number.isInteger(tileSize[1])) {
|
||||
tileWidth = tileSize[0];
|
||||
tileHeight = tileSize[1];
|
||||
} else if (tileSize[0] == undefined && Number.isInteger(tileSize[1])) {
|
||||
tileWidth = tileSize[1];
|
||||
tileHeight = tileSize[1];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if (tileWidth === undefined || tileHeight === undefined) {
|
||||
tileWidth = DEFAULT_TILE_SIZE;
|
||||
tileHeight = DEFAULT_TILE_SIZE;
|
||||
}
|
||||
if (resolutions.length == 0) {
|
||||
maxZoom = Math.max(
|
||||
Math.ceil(Math.log(width / tileWidth) / Math.LN2),
|
||||
Math.ceil(Math.log(height / tileHeight) / Math.LN2)
|
||||
);
|
||||
for (let i = maxZoom; i >= 0; i--) {
|
||||
resolutions.push(Math.pow(2, i));
|
||||
}
|
||||
} else {
|
||||
const maxScaleFactor = Math.max([...resolutions]);
|
||||
// TODO maxScaleFactor might not be a power to 2
|
||||
maxZoom = Math.round(Math.log(maxScaleFactor) / Math.LN2);
|
||||
}
|
||||
} else {
|
||||
// No tile support.
|
||||
tileWidth = width;
|
||||
tileHeight = height;
|
||||
resolutions = [];
|
||||
if (supportsListedSizes) {
|
||||
/*
|
||||
* 'sizes' provided. Use full region in different resolutions. Every
|
||||
* resolution has only one tile.
|
||||
*/
|
||||
sizes.sort(function(a, b) {
|
||||
return a[0] - b[0];
|
||||
});
|
||||
for (let i = 0; i < sizes.length; i++) {
|
||||
const resolution = width / sizes[i][0];
|
||||
resolutions.push(resolution);
|
||||
maxZoom = i;
|
||||
}
|
||||
} else {
|
||||
// No useful image information at all. Try pseudo tile with full image.
|
||||
resolutions.push(1);
|
||||
sizes.push([width, height]);
|
||||
maxZoom = 0;
|
||||
}
|
||||
}
|
||||
|
||||
const tileGrid = new TileGrid({
|
||||
tileSize: [tileWidth, tileHeight],
|
||||
extent: extent,
|
||||
origin: getTopLeft(extent),
|
||||
resolutions: resolutions
|
||||
});
|
||||
|
||||
const tileUrlFunction = function(tileCoord, pixelRatio, projection) {
|
||||
let regionParam,
|
||||
sizeParam;
|
||||
const zoom = tileCoord[0];
|
||||
if (maxZoom < zoom) {
|
||||
return;
|
||||
}
|
||||
const tileX = tileCoord[1],
|
||||
tileY = tileCoord[2],
|
||||
scale = resolutions[zoom];
|
||||
if (tileX < 0 || Math.ceil(width / scale / tileWidth) <= tileX ||
|
||||
tileY < 0 || Math.ceil(height / scale / tileHeight) <= tileY) {
|
||||
return;
|
||||
}
|
||||
if (supportsArbitraryTiling || supportsListedTiles) {
|
||||
const regionX = tileX * tileWidth * scale,
|
||||
regionY = tileY * tileHeight * scale;
|
||||
let regionW = tileWidth * scale,
|
||||
regionH = tileHeight * scale,
|
||||
sizeW = tileWidth,
|
||||
sizeH = tileHeight;
|
||||
if (regionX + regionW > width) {
|
||||
regionW = width - regionX;
|
||||
}
|
||||
if (regionY + regionH > height) {
|
||||
regionH = height - regionY;
|
||||
}
|
||||
if (regionX + tileWidth * scale > width) {
|
||||
sizeW = Math.floor((width - regionX + scale - 1) / scale);
|
||||
}
|
||||
if (regionY + tileHeight * scale > height) {
|
||||
sizeH = Math.floor((height - regionY + scale - 1) / scale);
|
||||
}
|
||||
const sizeHBySizeW = Math.round(sizeW / regionW * regionH),
|
||||
sizeWBySizeH = Math.round(sizeH / regionH * regionW),
|
||||
preferSizeByH = (sizeHBySizeW > sizeH) && (sizeW == sizeWBySizeH);
|
||||
if (regionX == 0 && regionW == width && regionY == 0 && regionH == height) {
|
||||
// canonical full image region parameter is 'full', not 'x,y,w,h'
|
||||
regionParam = 'full';
|
||||
} else if (!supportsArbitraryTiling || features.includes('regionByPx')) {
|
||||
regionParam = regionX + ',' + regionY + ',' + regionW + ',' + regionH;
|
||||
} else if (features.includes('regionByPct')) {
|
||||
const pctX = regionX / width * 100,
|
||||
pctY = regionY / height * 100,
|
||||
pctW = regionW / width * 100,
|
||||
pctH = regionH / height * 100;
|
||||
regionParam = 'pct:' + pctX + ',' + pctY + ',' + pctW + ',' + pctH;
|
||||
}
|
||||
if (version == Versions.VERSION3 && (!supportsArbitraryTiling || features.includes('sizeByWh'))) {
|
||||
sizeParam = sizeW + ',' + sizeH;
|
||||
} else if (!supportsArbitraryTiling || features.includes('sizeByW') && (!preferSizeByH || !(features.includes('sizeByH')))) {
|
||||
sizeParam = sizeW + ',';
|
||||
} else if (features.includes('sizeByH')) {
|
||||
sizeParam = ',' + sizeH;
|
||||
} else if (features.includes('sizeByWh')) {
|
||||
sizeParam = sizeW + ',' + sizeH;
|
||||
} else if (features.includes('sizeByPct')) {
|
||||
sizeParam = 'pct:' + (100 / scale);
|
||||
}
|
||||
} else {
|
||||
regionParam = 'full';
|
||||
if (supportsListedSizes) {
|
||||
sizeParam = sizes[zoom][0] + ',' + (version == Versions.VERSION3 ? sizes[zoom][0] : '');
|
||||
} else {
|
||||
sizeParam = version == Versions.VERSION3 ? 'max' : 'full';
|
||||
}
|
||||
}
|
||||
return baseUrl + regionParam + '/' + sizeParam + '/0/' + quality + '.' + format;
|
||||
};
|
||||
|
||||
const IiifTileClass = CustomTile.bind(null, tileGrid);
|
||||
|
||||
super({
|
||||
attributions: options.attributions,
|
||||
attributionsCollapsible: options.attributionsCollapsible,
|
||||
cacheSize: options.cacheSize,
|
||||
crossOrigin: options.crossOrigin,
|
||||
opaque: options.opaque,
|
||||
projection: options.projection,
|
||||
reprojectionErrorThreshold: options.reprojectionErrorThreshold,
|
||||
state: options.state,
|
||||
tileClass: IiifTileClass,
|
||||
transition: options.transition,
|
||||
wrapX: options.wrapX !== undefined ? options.wrapX : false,
|
||||
tileGrid: tileGrid,
|
||||
tilePixelRatio: options.tilePixelRatio,
|
||||
tileUrlFunction: tileUrlFunction
|
||||
});
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
export default IIIF;
|
||||
Reference in New Issue
Block a user