source: other-projects/playing-in-the-street/summer-2013/trunk/Playing-in-the-Street-WPF/Content/Web/KinectWorker-1.8.0.js@ 28897

// -----------------------------------------------------------------------
// <copyright file="KinectWorker-1.8.0.js" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
// -----------------------------------------------------------------------

"use strict";

var imageDataMap = {};

// Associate a specified ImageData (from a canvas object) with the specified image name
//     .setImageData( imageName [, imageData] )
//
// imageName: Name used to refer to canvas ImageData object specified.
// imageData: Canvas ImageData to associate with image name. If null, any previously
//            existing association is removed.
function setImageData(imageName, imageData) {
    if ((imageData == null) && imageDataMap.hasOwnProperty(imageName)) {
        delete imageDataMap[imageName];
    } else {
        imageDataMap[imageName] = imageData;
    }
}


// Copy the information in the specified image ArrayBuffer to the ImageData associated
// with the specified name and post the ImageData back to UI thread.
//     .processImageData( imageName, imageData )
//
// imageName: Name used to refer to canvas ImageData object to receive data from
//            ArrayBuffer.
// imageBuffer: ArrayBuffer containing image data to copy to canvas ImageData structure.
function processImageData(imageName, imageBuffer) {
    if (!imageDataMap.hasOwnProperty(imageName)) {
        self.postMessage({ "message": "notProcessed", "imageName": imageName});
        return;
    }

    var imageData = imageDataMap[imageName];
    var pixelArray = imageData.data;
    var newPixelData = new Uint8Array(imageBuffer);

    for (var i = 0; i < pixelArray.length; ++i) {
        pixelArray[i] = newPixelData[i];
    }

    self.postMessage({ "message": "imageReady", "imageName": imageName, "imageData": imageData });
}

// thread message handler
addEventListener('message', function (event) {
    switch (event.data.message) {
        case "setImageData":
            setImageData(event.data.imageName, event.data.imageData);
            break;

        case "processImageData":
            processImageData(event.data.imageName, event.data.imageBuffer);
            break;
    }
});