Merged LesionTracker and OHIF Viewer, refactored out common components

Packages/cornerstone/client/cornerstoneWADORSImageLoader.js

@@ -0,0 +1,77 @@
+cornerstoneWADORSImageLoader = {
+  internal : {
+    nextIndex: 0,
+    imageIds : []
+  }
+};
+
+cornerstoneWADORSImageLoader.addImage = function(image) {
+  var index = cornerstoneWADORSImageLoader.internal.nextIndex++;
+  cornerstoneWADORSImageLoader.internal.imageIds[index] = image;
+  var imageId = 'wadors:' + index;
+  return imageId;
+};
+
+function getMinMax(storedPixelData)
+{
+  // we always calculate the min max values since they are not always
+  // present in DICOM and we don't want to trust them anyway as cornerstone
+  // depends on us providing reliable values for these
+  var min = 65535;
+  var max = -32768;
+  var numPixels = storedPixelData.length;
+  var pixelData = storedPixelData;
+  for(var index = 0; index < numPixels; index++) {
+    var spv = pixelData[index];
+    // TODO: test to see if it is faster to use conditional here rather than calling min/max functions
+    min = Math.min(min, spv);
+    max = Math.max(max, spv);
+  }
+
+  return {
+    min: min,
+    max: max
+  };
+}
+
+cornerstone.registerImageLoader('wadors', function(imageId) {
+  var index = imageId.substring(7);
+  var image = cornerstoneWADORSImageLoader.internal.imageIds[index];
+
+  var deferred = $.Deferred();
+
+  var mediaType;// = 'image/dicom+jp2';
+
+  DICOMWeb.getImageFrame(image.uri, mediaType).then(function(result) {
+    //console.log(result);
+    // TODO: add support for retrieving compressed pixel data
+    var storedPixelData;
+    if(image.instance.bitsAllocated === 16) {
+      if(image.instance.pixelRepresentation === 0) {
+        storedPixelData = new Uint16Array(result.arrayBuffer, result.offset, result.length / 2);
+      } else {
+        storedPixelData = new Int16Array(result.arrayBuffer, result.offset, result.length / 2);
+      }
+    } else if(image.instance.bitsAllocated === 8) {
+      storedPixelData = new Uint8Array(result.arrayBuffer, result.offset, result.length);
+    }
+
+    // TODO: handle various color space conversions
+
+    var minMax = getMinMax(storedPixelData);
+    image.imageId = imageId;
+    image.minPixelValue = minMax.min;
+    image.maxPixelValue = minMax.max;
+    image.render = cornerstone.renderGrayscaleImage;
+    image.getPixelData = function() {
+      return storedPixelData;
+    };
+    //console.log(image);
+    deferred.resolve(image);
+  }).catch(function(reason) {
+    deferred.reject(reason);
+  });
+
+  return deferred;
+});
+