examples/customWebWorkerTask/index.html

<!DOCTYPE HTML>
<html>
<head>
    <!-- twitter bootstrap CSS stylesheet - included to make things pretty, not needed or used by cornerstone -->
    <link href="../bootstrap.min.css" rel="stylesheet">

    <link href="../cornerstone.min.css" rel="stylesheet">

</head>
<body>
<div class="container">

    <div class="page-header">
        <h1>Example of using a custom web worker</h1>
        <p class="lead">
            Enter a URL for a DICOM P10 object below to view it using cornerstone.
            <button id="toggleCollapseInfo" class="btn btn-primary" type="button">
                Click for more info
            </button>
        </p>
    </div>
    <div id="collapseInfo" class="collapse" style="display:none;">
        <p>
            This example illustrates how to use the cornerstoneWADOImageLoader to get a DICOM P10
            SOP instance using HTTP and display it in your web browser using cornerstone.
            Not all transfer syntaxes are currently supported,
            <a href="https://github.com/cornerstonejs/cornerstoneWADOImageLoader/blob/master/docs/TransferSyntaxes.md">
                click here for the full list.
            </a>
            For WADO-URI requests,
            you can request that the server return the SOP Instance in explicit little endian by
            appending the following query string to your URL:
            <code>&transferSyntax=1.2.840.10008.1.2.1</code>
        </p>
        <P>
            Use the query string parameter <i>frame</i> to specify which frame to display from a multiframe
            object (defaults to the first frame if not specified). <code>?frame=2</code>
        </P>
        <strong>If you get an HTTP error and your URL is correct, it is probably because the server is not configured to
            allow <a href="http://en.wikipedia.org/wiki/Cross-origin_resource_sharing">Cross Origin Requests</a>.
            Most browsers will allow you to enable cross domain requests via settings or command line switches,
            you can start chrome with the command line switch <code>--disable-web-security</code> to allow cross origin requests.
            See the  <a href="http://enable-cors.org/">Enable CORS site</a> for information about CORS.
        </strong>
        <br>
        <br>
        <p>
            Looking for a CORS proxy?  Try <a href="https://www.npmjs.com/package/corsproxy">CORSProxy</a>
        </p>
        <strong>Use of this example require IE10+ or any other modern browser.</strong>
        <hr>
    </div>

    <div class="row">
        <form id="form" class="form-horizontal">
            <div class="form-group">
                <label class="control-label col-sm-1" for="wadoURL">URL</label>
                <div class="col-sm-8">
                    <input class="form-control" type="text" id="wadoURL" placeholder="Enter WADO URL" value="https://raw.githubusercontent.com/cornerstonejs/cornerstoneWADOImageLoader/master/testImages/CT2_J2KR">
                </div>
                <div class="col-sm-3">
                    <button class="form-control" type="button" id="downloadAndView" class="btn btn-primary">Download and View</button>
                </div>
            </div>
            <div class="form-group">
                <div class="col-sm-3">
                    <button class="form-control" type="button" id="startWebWorker" class="btn btn-primary">Start 1 Sleep Tasks</button>
                </div>
                <div class="col-sm-3">
                    <button class="form-control" type="button" id="start10WebWorkers" class="btn btn-primary">Start 10 Sleep Tasks</button>
                </div>
                <div class="col-sm-3">
                    <button class="form-control" type="button" id="sharpen" class="btn btn-primary">Sharpen Image</button>
                </div>
                <div class="col-sm-3">
                    <button class="form-control" type="button" id="edgeDetect" class="btn btn-primary">Edge Enhance</button>
                </div>
                <div class="col-sm-3">
                    <button class="form-control" type="button" id="boxBlur" class="btn btn-primary">Box Blur</button>
                </div>
                <div class="col-sm-3">
                    <button class="form-control" type="button" id="gaussianBlur" class="btn btn-primary">Gaussian Blur</button>
                </div>
                <div class="col-sm-3">
                    <button class="form-control" type="button" id="emboss" class="btn btn-primary">Emboss</button>
                </div>

                <div class="col-sm-3">
                    <button class="form-control" type="button" id="unsharp" class="btn btn-primary">Unsharp</button>
                </div>
            </div>
        </form>
    </div>
    <br>
    <div class="row">
        <div class="col-md-6">
            <div style="width:512px;height:512px;position:relative;color: white;display:inline-block;border-style:solid;border-color:black;"
                 oncontextmenu="return false"
                 class='disable-selection noIbar'
                 unselectable='on'
                 onselectstart='return false;'
                 onmousedown='return false;'>
                <div id="dicomImage"
                     style="width:512px;height:512px;top:0px;left:0px; position:absolute">
                </div>
            </div>
        </div>
        <div class="col-md-6">
            <span>Max Web Workers: </span><span id="maxWebWorkers"></span><br>
            <span>Num Web Workers: </span><span id="numWebWorkers"></span><br>
            <span>Num Queued Tasks: </span><span id="numQueuedTasks"></span><br>
            <span>Num Tasks Executing: </span><span id="numTasksExecuting"></span><br>
            <span>Total Tasks Executed: </span><span id="totalTasksExecuted"></span><br>
            <span>Total Task Execution Time: </span><span id="totalTaskExecutionTime"></span><br>
            <span>Total Task Delay Time: </span><span id="totalTaskDelayTime"></span><br>
        </div>
    </div>
</div>
</body>

<!-- include the cornerstone library -->
<script src="../cornerstone.min.js"></script>
<SCRIPT src="../cornerstoneMath.min.js"></SCRIPT>
<SCRIPT src="../cornerstoneTools.min.js"></SCRIPT>

<!-- include the dicomParser library as the WADO image loader depends on it -->
<script src="../dicomParser.min.js"></script>

<!-- include the cornerstoneWADOImageLoader library -->
<script src="../../dist/cornerstoneWADOImageLoader.js"></script>

<!-- Lines ONLY required for this example to run without building the project -->
<script>window.cornerstoneWADOImageLoader || document.write('<script src="https://unpkg.com/cornerstone-wado-image-loader">\x3C/script>')</script>
<script src="../utils/customWebWorkersConfig.js"></script>

<script>
    // Initialize the web worker manager with our custom web worker task
    // window.customWebWorkerConfig contains custom web worker config and a fallback in case there is no dist folder
    config = window.customWebWorkerConfig;

    cornerstoneWADOImageLoader.external.cornerstone = cornerstone;
    cornerstoneWADOImageLoader.webWorkerManager.initialize(config);
    document.getElementById('numWebWorkers').textContent = config.maxWebWorkers;

    let loaded = false;
    let loadedImage;

    function loadAndViewImage(imageId) {
        const element = document.getElementById('dicomImage');
        try {
            const start = new Date().getTime();
            cornerstone.loadAndCacheImage(imageId, {usePDFJS: false}).then(function(image) {
                console.log(image);
                loadedImage = image;
                updateStatistics();
                const viewport = cornerstone.getDefaultViewportForImage(element, image);
                cornerstone.displayImage(element, image, viewport);
                if(loaded === false) {
                    cornerstoneTools.mouseInput.enable(element);
                    cornerstoneTools.mouseWheelInput.enable(element);
                    cornerstoneTools.wwwc.activate(element, 1); // ww/wc is the default tool for left mouse button
                    cornerstoneTools.pan.activate(element, 2); // pan is the default tool for middle mouse button
                    cornerstoneTools.zoom.activate(element, 4); // zoom is the default tool for right mouse button
                    cornerstoneTools.zoomWheel.activate(element); // zoom is the default tool for middle mouse wheel
                    loaded = true;
                }

            }, function(err) {
                alert(err);
            });
        }
        catch(err) {
            alert(err);
        }
    }

    function downloadAndView(){
        let url = document.getElementById('wadoURL').value;

        // prefix the url with wadouri: so cornerstone can find the image loader
        url = "wadouri:" + url;

        // image enable the dicomImage element and activate a few tools
        loadAndViewImage(url);
    }

    function getUrlWithoutFrame() {
        const url = document.getElementById('wadoURL').value;
        const frameIndex = url.indexOf('frame=');
        if(frameIndex !== -1) {
            url = url.substr(0, frameIndex-1);
        }
        return url;
    }

    function updateStatistics() {
        var stats = cornerstoneWADOImageLoader.webWorkerManager.getStatistics();
        document.getElementById('maxWebWorkers').textContent = stats.maxWebWorkers;
        document.getElementById('numWebWorkers').textContent = stats.numWebWorkers;
        document.getElementById('numQueuedTasks').textContent = stats.numTasksQueued;
        document.getElementById('numTasksExecuting').textContent = stats.numTasksExecuting;
        document.getElementById('totalTasksExecuted').textContent = stats.numTasksCompleted;
        document.getElementById('totalTaskExecutionTime').textContent = stats.totalTaskTimeInMS;
        document.getElementById('totalTaskDelayTime').textContent = stats.totalTimeDelayedInMS;
    }

    var sleepTaskLoaded = false;

    function startWebWorker() {
        // dyanmically load the sleep task
        if(!sleepTaskLoaded) {
            sleepTaskLoaded = true;
            // TODO: This URL probably won't work on hosted site
            cornerstoneWADOImageLoader.webWorkerManager.loadWebWorkerTask(
              `${window.location.protocol}//${window.location.host}/examples/customWebWorkerTask/sleepTask.js`,{
                        'sleepTask' : {
                            sleepTime: 3000
                        }
                    }
            );
        }

        const task = cornerstoneWADOImageLoader.webWorkerManager.addTask('sleepTask', {},-10);
        const promise = task.promise;
        promise.then(function(result) {
            console.log('sleep task completed');
            updateStatistics();
        });
        updateStatistics();
    }

    const element = document.getElementById('dicomImage');
    cornerstone.enable(element);

    document.getElementById('downloadAndView').addEventListener('click', function(e) {
        downloadAndView();
    });
    document.getElementById('startWebWorker').addEventListener('click', function(e) {
        startWebWorker();
    });
    document.getElementById('start10WebWorkers').addEventListener('click', function(e) {
        for(let i=0; i < 10; i++) {
            startWebWorker();
        }
    });


    function convolute(kernel, multiplier, calculateWWWC) {
        const promise = cornerstoneWADOImageLoader.webWorkerManager.addTask('convolveTask', {
            pixelData :loadedImage.getPixelData(),
            kernel : kernel,
            multiplier: multiplier,
            imageFrame: {
                typedArrayName: loadedImage.getPixelData().constructor.name,
                width : loadedImage.width,
                height : loadedImage.height
            }
        }, -8).promise;
        promise.then(function(result) {
            console.log('convolveTask task completed');
            result.pixelData = new Int16Array(result.pixelData);

            const sharpenedImage = {
                color: false,
                columns: loadedImage.columns,
                rows: loadedImage.rows,
                width: loadedImage.width,
                height: loadedImage.height,
                imageId: new Date().toISOString(),
                maxPixelValue: result.minMax.max,
                minPixelValue: result.minMax.min,
                windowWidth: calculateWWWC ? (result.minMax.max - result.minMax.max) : loadedImage.windowWidth,
                windowLevel: calculateWWWC ? ((result.minMax.max + result.minMax.max) / 2) : loadedImage.windowLevel,
                sizeInBytes: loadedImage.sizeInBytes,
                render: loadedImage.render,
                slope: loadedImage.slope,
                intercept: loadedImage.intercept,
                invert: loadedImage.invert,
                getPixelData: function () {
                    return result.pixelData;
                }
            };

            cornerstone.displayImage(element, sharpenedImage);
            loadedImage = sharpenedImage;
            updateStatistics();
        });
    }

    document.getElementById('sharpen').addEventListener('click', function(e) {
        convolute([
            [ 0,-1, 0],
            [-1, 5,-1],
            [ 0,-1, 0]
        ], 1);
    });
    document.getElementById('edgeDetect').addEventListener('click', function(e) {
        convolute([
            [-1,-1,-1],
            [-1, 9,-1],
            [-1,-1,-1]
        ], 1);
    });
    document.getElementById('boxBlur').addEventListener('click', function(e) {
        convolute([
            [1,1,1],
            [1,1,1],
            [1,1,1]
        ], 1/9);
    });
    document.getElementById('gaussianBlur').addEventListener('click', function(e) {
        convolute([
            [1,2,1],
            [2,4,2],
            [1,2,1]
        ], 1/16);
    });
    document.getElementById('emboss').addEventListener('click', function(e) {
        convolute([
            [-2,1,0],
            [-1,1,1],
            [ 0,1,2]
        ], 1/3);
    });

    document.getElementById('unsharp').addEventListener('click', function(e) {
        convolute([
            [ 1, 4,   6, 4, 1],
            [ 4,16,  24,16, 4],
            [ 6,24,-476,24, 6],
            [ 4,16,  24,16, 4],
            [ 1, 4,   6, 4, 1],
        ], -1/256);
    });

    const form = document.getElementById('form');
    form.addEventListener('submit', function() {
        downloadAndView();
        return false;
    });

    document.getElementById('toggleCollapseInfo').addEventListener('click', function() {
        if (document.getElementById('collapseInfo').style.display === 'none') {
            document.getElementById('collapseInfo').style.display = 'block';
        } else {
            document.getElementById('collapseInfo').style.display = 'none';
        }
    });

    // set an interval timer to periodically update the statistics for a real time view of
    // what the web workers are doing
    setInterval(function() {
        updateStatistics();
    }, 100);
</script>
</html>